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Drag Racing Analyzer v3.4 for Windows User`s Manual

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1. C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 1 Introduction _ q q _ _ E eee eS een Clicking on Back or pressing the lt ESC gt key will return you to the Main Menu From the Main Menu you can modify the GT5 0L to see the effect on performance For example you could go into any of the component menus and e Change to a different rear axle ratio e Install stickier tires e Change weather or wind conditions The beauty of the program is that it repeats exactly each time This lets you find differences which would be clouded by changes in track conditions or driver variations Many of the input specifications you see in the various menus may not be familiar to you For a brief definition of the inputs simply click on the specification name The definition will appear in the Help frame with a page in this manual for more info Some of the vehicle specifications have Clc buttons One example is Dew Point in the Calculate Performance Conditions menu Clc stands for calculate For example if you want to calculate the Dew Point from wet and dry bulb readings simply click on the Cle button The program will display a new menu listing the inputs and the Calc Dew Point from these inputs For further explanation click on the Help buttons in these menus To use the Calc Dew Point calculated from these inputs click on the Use Calc Value button Otherwise click on Cance
2. Open a Vehicle File To open a vehicle file saved in the Library either e Click on the Open button e Click on the File vehicle menu item and then on the Open Vehicle options from the list You will obtain the window shown on the previous page Single click on one of the vehicles in the list or click and drag the slide button on the right side of the list to display more vehicles Once you single click on a vehicle it is now the Chosen Vehicle File and a preview of the vehicle is given in the Preview section If the file you chose was not a valid Drag Racing Analyzer file the program will tell you and you can not choose it Once a vehicle has been chosen you can delete it by clicking on the Delete button or Open it by clicking on the Open button in this window You can also click on a different vehicle to Preview it or close this window and return to the Main Menu without choosing a new vehicle file If you are sure of the vehicle you want to open you can simply double click on it from the Vehicle List This opens the vehicle without a preview and closes this menu Save a Vehicle File Before we discuss saving an engine file it is important for you to understand how the program opens and uses vehicle files When you open a vehicle from the Vehicle Library you are only using a copy of the vehicle The original vehicle file is kept in the library As you make changes to the vehicle they are only made to this copy The o
3. and enter 1 425 which is about 02 seconds slower longer than your Previous Run 60 foot times Click on the Cle button by Throttle Stop and the program recommends you use a 1 333 second throttle stop setting Enter this number into your throttle stop timer Remember because you ve already added Figure 4 35 Dial In Menu Enter weather conditions throttle stop settings 60 foot times and ETs for 2 known Previous Runs The 2 different throttle stop settings time throttle plates are closed must produce at least a 3 second difference in ET Throttle Stop Prediction File THRTLSP Enter weather Exit File Edit Advance Update Phediction Help __ _ conditions for Previous Run Predicted Run your Predicted or Dial In Run ths Baro He Air Temp deg F ths Baro He Air Temp deg F Optional You RelHum Elevation feet Wind MPH Wind Direction Throttle Stop 60 foot sec ET sec 76 Note Throttle Stops for Run 1 and Run 2 must produce ETs that are at least 3 seconds different Rel Hum Elevation feet Wind MPH Wind Direction Z Estimate Change 60 foot sec Throttle Stop 1 333 General Specs and Comments Method of Reading Weather Data Altimeter with Rel Hum BE Help The approximate time from the release of the trans brake or clutch pedal until the throttle stop comes on This gives the program a general idea if the thr
4. isplacement cu in that HP has a separate scale on the right side Click here to print power curve and table Click here to load a power curve from an Engine Analyzer program Click here or here to calculate power curve specs from other simple inputs Click here to blank out table to enter new numbers Certain sections will be disabled grayed out depending on your choice of Method of Describing Power Curve C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions Method of Describing Power Curve Click on the down arrow of this combo box for the following choices e Peak HP Only Peak Torque and HP Only Full Power Curve which enables the 4 command buttons in this section as shown in Figure 2 4 Pick an Example Example Example Name if you have already chosen and example Depending on your choice the appropriate sections buttons and inputs will be disabled grayed out and you will not be able to access them Displacement cu in The engine s cubic inch displacement is used for 2 things e First it is used to determine the shape of the power curve from limited user input especially in the case of specifying Peak HP Only e It is used to estimate the amount of rotating inertia in the engine and clutch flywheel or converter The bigger the cubic inches the larger the assumed rotating inertia Therefore even if you are specifying the Full Power Curve enter the cubic inches to
5. 234 000 1 822 1 838 2 038 3 090 4 058 00 4 55 40 07 40 38 40 24 60 00 75 73 1 Mon Oct 21 02 8 37 am Time Slip For 1OSEC FW D 500 1 822 4 773 1 2 2 2 Drag Strip Time Slip available by 3 clicking on Time Slip for current 3 results or run from the History Log 4 4 4 6064 8400 6173 6173 6643 6643 8 807 9 138 10 855 119 11 50 941 1000 1320 121 65 29 132 07 26 Test Title Dnsy Alt Pty Dnsy Alt 60 ft T os SNS SW WS Imprvmnt ET Imprymnt MPH 7 135 107 39 9 138 10 855 131 07 1OSEC FW D Mon Oct 21 02 9 04 am 10SEC Fw D Mon Oct 21 02 8 37 am 2002 Ford Focus SYT Stock Sun Oct 20 02 10 54 am 2002 Ford Focus SYT Stock Sun Oct 2002 10 54 am Open retrieve these spezs z a Show Help Describing his Column 1941 1941 1941 1941 941 941 2002 Ford Focus SYT Stock un Oct 2002 Ford Focus SYT Stock Sun Oct 2002 Ford Focus SYT Stock Sun Oct Rename Test Show Time Slip 941 941 941 1 822 1 822 1 910 1 910 1 910 1 909 1 909 1 909 1 909 000 088 000 000 001 000 000 000 609 10 855 10 855 12 244 12 244 12 244 12 243 12 243 12 243 12 243 000 1 389 000 000 001 000 000 000 2 938 131 07 131 07 113 02 113 02 113 02 113 02 113 02 113 02 113 02 Click on any row from the History Log to be presented with these options The Open option lets you retr
6. From this main menu you can e Choose to review or modify any of the categories of vehicle specifications displayed e Open or Save a file of complete vehicle specifications by clicking on the Open or Save buttons first 2 buttons on the left or the File menu item then either Open or Save e Add edit or review vehicle comments to describe the vehicle currently held in the program e Calculate vehicle performance from the options listed under Calculate Performance From here you can specify calculation options barometric pressure humidity track length etc e Change the Preferences options to somewhat customize the program for you e Get HELP to explain these options by clicking on Help or pressing lt F1 gt e Quit the program by clicking on File then Exit or click on the Quit button C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 1 Introduction EE All these options are explained in detail in Chapters 2 and 3 In the Main Menv s blue title bar you will notice the current Vehicle is GT5 0L The program has descriptions of vehicles saved in the Library right from the factory The current file from the Vehicle Library is called GT5 0L To get started let s examine but not change the various categories of specs Click on a button for one of the categories like Engine Transmission etc A new menu will appear displaying the various specs and the current values for the GT5 0L vehicle You can click on the name
7. Is the outside air temperature when the Dew Point measurement was made 72 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions Dew Point deg F Is the air s Dew Point in degrees F as reported by a weather service or measured by humidity instruments Dry Bulb Temp deg F Is the temperature of the dry bulb thermometer on the psychrometer in degrees F This is also the temperature of any thermometer mounted in the shade when the Wet Bulb Temp reading is taken The Dry Bulb Temp must not be less than the Wet Bulb Temp Wet Bulb Temp deg F Is the temperature of the wet bulb thermometer on the psychrometer in degrees F The wet bulb has a wick or cloth covering the bulb which is moistened with water The dryer the air the greater the difference between the wet and dry bulb readings Relative humidity or dew point can be manually read off a Psychometric chart from these two readings This calculation replaces reading the chart The Wet Bulb Temp must be less than the Dry Bulb Temp 73 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions 2 9 Match Vehicle Performance The Drag Racing Analyzer will automatically fine tune certain critical specs to match a particular vehicle s performance See Example 4 2 The Match Vehicle Performance process consists of 1 You set all specs to match the vehicle you are building as close as practical This is very important for accurate r
8. Save Vehicle File New Vehicle Name pow aa Dyno Rating aaam Enter a New Yehicle Name and click on OK The current 4 56 p Mehicle name is given should you choose to modify it Wheel Drive slightly for the new name Use the Delete key to erase the aiestanate name if you want a completely new name loodyear SuperStock 32x14 15 a automatic trans Shifts 4 sec full throttle at 7400 7400 RPM Calculate Performance Help Comments Move mouse over item for My 71 Monte Carlo 502 Big Block Chevy that looks like it puts description to be given here out about 700 HP with a TH400 3 speed auto Click on Help in menu line for more detailed info on options C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 4 Examples o a ee ee in for comments When finished click on the Save button or on File and then Save Vehicle You are first as shown Figure 4 26 You answer No since these specs no longer represent the SPR STCK V 6 but that you want to give ita new name Next the screen shown in Figure 4 27 is displayed Change the New Vehicle Name from SPR STCK V 6 to something that matches these specs like MY CAR or 71MONTE Now you are ready to check various modifications on your vehicle like changing gear ratios tire size or shift points etc See Example 4 3 Conclusions e After accurately entering specs and then fine tuning them with the Match Vehicle Performance feature the Drag
9. i Ok oy aro Hg 28 84 7 weather for the Air Temp deg F _ Prf emp deg F next round RelHum Elevation feet Elevation feet Wind MPH wiae feo Wind Direction Tailwind f Wind Direction Side Wind 2 Click on the Estimate Change in 60 Foot Time Clc button to 60 foot sec 1 528 La Let Program Estimate 60 ft time calculate the ET sec 58 teat sec new Dial Dial In Sec ome TH General Specs and Comments Help Method of Reading Weather Data Observed barometer reading in inches of mercury as read directly off a barometer Uncort Baro with Rel Hum Ei instrument not corrected to sea level for elevation p xx Conclusions e The Drag Racing Analyzer can make detailed ET predictions based on changes to weather conditions e The Dial In menu makes calculating Dial Ins for Bracket Racing convenient e Using 001 Sec Increments instead of 01 Sec Increments in the Preferences menu lets the program make ET and Dial In predictions in thousandths of a second 137 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 4 Examples Example 4 4 Predict Throttle Stop to Run Index Important See Appendix 3 page 155 for new features in Version 3 2 Features Introduced and suggested background reading e Example 4 2 and 4 3 e Throttle Stop Section 2 10 e Track Weather Specs Section 2 7 2 This example is very similar to Example 4 3 except instead of predicti
10. T Slip is shown as 100 and an S appears in the Accel Gs column 58 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions EE x _x _ x x_x x _x_xx_xx ESS SS Thrt Is the percent of the engine s HP being allowed to be delivered to the clutch or converter This will be reduced from 100 to prevent tire spin as directed by the Launch Throttle or as directed by the Shift Throttle 59 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions 2 8 Calculation Menus The following section explains the user input for engine specs listed with Clc buttons These specs are ones where you can simply enter a value or click on the Cle button and the program will present a menu of inputs which will calculate that particular parameter These menus are like computer scratch pads for calculating specs like Final Drive Ratio Tire Diameter etc from other inputs Notes The starting values in each calculation menu are usually blanked out when the menu is opened If there is other information in the program to estimate what one of your input values will be it may be loaded As shown in Figure 2 20 Vehicle Weight Engine Cubic Inches and RPM at HP Peak are already available from other menus in the program and these values are loaded into the Calculation Menu You are free to change them to any other value Once enough specs have been entered
11. The program makes several passes adjusting critical specs between each pass fine tuning the specs to find a combination which best matches your actual vehicle s performance After 20 30 passes it arrives at the combination shown in Figure 4 25 At the top of this menu you see how close these new specs will make the performance match In the Specified Drag Racing Analyzer Chapter 4 Examples Figure 4 24 Match Veh Perf Vehicle Perf Perf Obtained oS Sa Match Vehicle Performance Your Vehicle s Actual Performance Distance of Race Quarter Mile Stall RPM at Launch 60 Foot Time sec Finish MPH 133 1 Finish Engine RPM Finish Trans Gear 2 W Tip If you are not sure of Finish Engine RPM or do not want tire diameter changed just leave it blank or set itto 0 The program will not adjust tire growth or diameter to match this RPM Help Click on down arrow button to select either Quarter or Eighth Mile run p xx LOK laiust veh specs to match performance Figure 4 25 Results of Match Veh Perf Performance from New Specs Cony Stall 60 ft MPH PM Gr lower section you see the Old specs and the new ones arrived at which you can either Keep or discard and return to the old specs You see that the only New spec which is much different than the old specs in Engine Pk HP which has increased from 620 to 704 HP Click on the Keep These N
12. Unless you know your converter s torque multiplication use a value of 2 Transmission Type Click on the down arrow of this combo box for the following choices e Use Specs Below e Pick Example Transmission e Example Example Name if you have already chosen a transmission example The major differences between an automatic or manual transmission in this program are e An automatic transmission uses a torque converter This you select in the Clutch Converter section e An automatic transmission has higher power losses due to the pump and larger areas for fluid friction This is represented by the Efficiency spec in the Transmission section The program will let you combine a clutch with an automatic transmission lower Efficiency rating or a torque converter with a manual transmission higher Efficiency rating It also lets you combine any combination of example clutches converters and transmissions Efficiency Is the amount of power which actually leaves the transmission compared to the amount which entered the transmission gets from the engine Automatics are about 3 6 less efficient than manual transmissions The more heavy duty the transmission the less efficient larger bearing areas The fewer the number of gears the more efficient the transmission Click on the down arrow key to pick an efficiency from the list Examples of transmissions with these efficiencies are also given in this list Note You can pick a
13. 110 HiPrf Prod 10 PSI Boost 125 HiPrf Prod 15 PSI Boost 135 HiPrf Prod 20 PSI Boost 105 Strt Strp 5 PSI Boost 120 Strt Strp 10 PSI Boost 135 Strt Strp 15 PSI Boost 145 Strt Strp 20 PSI Boost 115 Good Race 5 PSI Boost 130 Good Race 10 PSI Boost 145 Good Race 15 PSI Boost 160 Good Race 20 PSI Boost 140 Exc Race 10 PSI Boost 170 Exc Race 20 PSI Boost 200 Exc Race 30 PSI Boost 225 Exc Race 40 PSI Boost 250 Exc Race 50 PSI Boost 270 Exc Race 60 PSI Boost 285 Exc Race 70 PSI Boost 300 Exc Race 80 PSI Boost RPM at HP Peak Is the RPM at which the HP peak occurs This is initially set to the RPM at HP Peak in the Engine menu but can be changed to anything you want Note Most any modification which increases HP other than nitrous oxide or super turbocharging will also increase RPM at HP Peak If you have no information about your RPM at HP Peak use an RPM 500 RPM lower than your shift RPM This RPM input is always loaded back into the Engine specs menu 64 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions 2 8 2 Calc Final Drive Figure 2 22 Calc Final Drive Ratio Ratio Calc Final Drive Ratio This menu is available by clicking on the Final Calc Final Drive Ratio Drive Ratio Clc button in the Body amp Axle specs menu Type ype Ring amp Pinion Gear Only Teeth Pinion Gear Click on this combo box to select from e Ring amp Pinion Gear Only typical of Teeth R
14. 14 Throttle Stop 5 6 1 52 71 72 77 78 79 80 81 138 139 140 141 142 Throttle Stop Prediction 5 77 158 159 Time Slip 156 Tire Diameter 35 36 60 68 74 76 117 120 163 Tire Growth 36 37 74 147 148 Torque 95 98 111 Total Vehicle Weight 29 66 TqMult 58 Track Length 53 56 Track Weather 50 124 138 Traction 2 27 29 30 31 33 36 37 39 70 74 80 82 85 111 116 118 136 144 147 148 151 Traction Factor 2 36 37 70 74 147 148 Trans Brake 23 45 75 77 140 172 Transmission 5 1 6 16 21 22 23 24 25 27 28 39 40 41 43 44 45 47 57 65 66 75 90 103 120 124 125 147 148 149 150 152 Trap Speed 53 56 111 Tread 35 36 68 69 117 Tread Width 36 68 117 Vehicle Library 5 6 7 9 91 99 100 110 119 131 132 138 147 Vehicle Weight 26 29 60 61 63 66 120 122 144 151 152 153 Version 3 1 Version 3 2 154 Version 3 4 163 Vol Eff 61 62 63 Volume 61 Weather 1 9 50 51 52 73 77 79 80 82 84 106 109 119 121 122 132 134 136 137 138 140 141 142 Weather Stations 50 52 Weight on Axle 67 125 Wet Bulb 71 72 73 121 Wheel Rim Diameter 69 Wheel Tire 34 35 70 117 126 127 151 Wheelbase 30 120 126 Wheels amp Tires Wt 35 Which Axle 67 Wind 53 121 134 140 145 Wind Direction 53 121 145 Wind Speed 53 121 145 Windows 1 2 4 5 18 20 32 102 10
15. 24 25 27 28 29 31 32 39 40 41 42 43 47 50 52 57 60 61 67 74 75 77 86 87 88 89 90 100 105 107 108 113 118 119 120 121 122 124 125 126 131 132 170 134 135 136 138 140 144 145 146 147 149 150 151 152 Examples 6 24 28 39 43 44 46 47 87 88 90 107 124 126 148 Exhaust System 5 Feet 57 58 97 106 111 File 2 4 5 6 79 84 100 101 108 131 132 133 File Engine 2 5 6 61 100 104 108 Final Drive Ratio 27 60 65 114 117 120 Finish 1 56 62 76 Finish Engine RPM 76 Finish MPH 76 Finish Trans Gear 76 Flywheel 16 150 151 152 Front Wheel Drive 28 34 35 Front Wheel Tire 34 126 151 Frontal Area 31 32 67 90 153 Frt Roll Stfns 28 30 31 Full Power Curve 15 16 18 62 Gear Ratio 25 Graph 5 1 7 8 14 18 43 46 47 95 96 97 98 111 112 113 116 118 Graph XE Graphs Labels 96 Graph XE Graphs with Baseline 98 Graph XE Graphs without Baseline 98 Graphs 7 8 95 96 97 98 111 113 Graphics File 164 165 166 167 Height of CG 29 History 5 54 105 106 108 114 115 116 117 118 HP 13 95 98 111 Humidity 1 5 18 51 52 71 72 73 106 123 134 140 141 Improvement 7 56 106 Improvement Summary 56 Imprvmnt 106 Include Vehicle Comments 104 Include Vehicle Specs 103 Index 6 77 80 81 86 138 140 142 145 155 Index sec 81 C Performance Trends
16. This name can be a handy reminder of the type of vehicle you are simulating and also where you got these specs There are 2 general ways to pick an example component You can either select the Pick An Example from the Type combo box or click on the Components This screen does not Get Example button at the bottom of the menu You appear for all component examples may be first presented with a list of general categories of component examples like shown in Figure 2 36 This screen would not appear for picking Body Torque Converters Details because there is no other component examples available at this menu i Tip Click on the catagory to highlight it then click on the Eventually you will obtain a list of examples like Use Catagory button or just Double Click on the shown in Figure 2 37 Here you can select your pase ae Ore ae choice by either clicking on it then clicking on the Pick button or double clicking on it By single clicking on an example you have saved not one Figure 2 36 Categories of Example Figure 2 37 List of Body Details Examples Rr Wt CGHt WhlBs RTWdth FrtStfns Farea Drag No Frnt No Frnt S Modern Pr Modern Pr Modern Pr Modern Pr 69 70 Mustang Big Block 69 70 Mustang Small Block 79 86 Mustang 5 0L 87 93 Mustang 5 0L 80s Cutlass BuickGN etc 82 92 Camaro Firebird Typ Rear Engine Sports Car Modern Pr Camaro Firebird Modern Pr 0 SB Camaro Firebird WO 44 22 No Frnt S BB Camaro Fir
17. Tire Traction Factor Shift Time Use the guidelines in Sections 2 2 2 7 and Example 4 2 to estimate the uncertain specs Calculate performance and compare the computer s results to your car s actual results Use actual results from a good running day and results you feel comfortable you could repeat under the same conditions Then use the tips below bring the computer s results in line with these actual results 147 C Performance Trends Inc 1998 Drag Racing Analyzer Appendices To increase the MPH with little effect on ET e Reduce Drag Coefficient e Increase Tire Growth e Increase Engine Power Curve specs and decrease Traction Factor To decrease ET and 60 ft times with little effect on MPH Increase Traction Factor Adjust Converter Capacity stall RPM for automatic transmissions Adjust Converter Torque Multiplication for automatic transmissions Increase Launch RPM for manual transmissions If Bog engine RPM dropping too low is a problem try reducing Clutch Force for manual transmissions e If traction is not a problem increase Clutch Force or other clutch specs which produce more torque holding capability To increase ET and 60 ft times with little effect on MPH e Reduce Traction Factor e Choose Use Specs Below for the Launch Type in the Driving Specs and use the launch specs to simulate your actual launch To decrease ET and increase MPH with little effect on 60 ft time Leave Tire Traction and other
18. below for more details Rear Wheel Tire Specs If you have specified Front Wheel Drive as the Driveline Layout in the Body amp Axle menu this section will be labeled Rear Wheel Tire Wheels amp Tires Wt Ibs This is the weight of one wheel tire assembly which can be obtained by weighing the tire mounted on the wheel on a weighing or bathroom scale The program assumes there are 2 front wheels and tires on the vehicle unless you have specified Motorcycle as the Driveline Layout in the Body amp Axle menu Tire Diameter inches The diameter of the tire is the distance from the tread across the center of the wheel to the other tread This is sometimes referred to as how tall the tire is For example for 10 x 32 inch slicks the 32 refers to the diameter of the tire This term has been changed from previous versions of Drag Racing Analyzer which used the input of Rolling Radius or the distance from the center of the wheel to the tread on the ground This is approximately half of the Tire Diameter 35 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions pua Since tires can squat as they are Figure 2 12 Estimate of Tire Diameter mounted on the car or as you change air pressure a better estimate of the diameter is to measure the distance in inches from the center of the tire to the ground while the tire is mounted on the car This will give the radius which you can then multiply by 2 to obtain
19. increase the Traction Factor or specify a higher traction Tire Type in the Wheel Tire Specs menu Click on the Examples button to be presented with a list of examples of Traction Factor for various types of tires If you are limited to a low value of Traction Factor or are running a Tire Type which is not Drag Slicks try Increase Wt on Rear Tires in the Vehicle Specs menu Increase Height of CG in the Vehicle Specs menu Reduce Frt Susp Roll Stiff in the Vehicle Specs menu Increase Diff Lock Eff in the Vehicle Specs menu gt5 0l Mon Apr 13 98 9 57 pm 1320 294 618 230 25 14 57 04 94 93 4 43 69 mach1 Fri Apr 1098 10 48 am 1320 1789 2138 255 02 14 53 14 99 36 1 70 Click on Test Title 1st column to change it or to retrieve specs which produced those results Click in other columns for definitions 94 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 3 Output 3 2 Graphs Graphs are obtained by clicking on the Graph button or the Graph menu command in the Test Results screen shown in Figure 3 2 Graphs can be of 7 types of data and may include a baseline graph of some previous run depending on the settings of certain Options Figure 3 5 Graph Screen Menu item to return to Test Results screen Menu item to print graph Window setup and print options and print button available by clidking on Options Menu item to brint up Options menu shown on next page Quick selection of types of data t
20. increment in 50 ratio increments to 5 5 With wrenches money parts and a drag strip this could take 113 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 4 Examples T several days On the computer we will be done in a few minutes with clean fingernails and money left in our wallet Click on Final Drive Ratio under Axle Specs and type 2 over the current value of 3 08 If 2 had not been within acceptable limits the program will display the limits Then click on OK to return to the Main Menu There you can click on Calculate Performance then the Calculate Performance button at this menu as you did before or just click on the Calc ET button at the top of the Main Menu The Calc ET button is a shortcut Figure 4 8 Test Results with 2 0 Axle Ratio Notice negative improvement in ET of 556 seconds or the car went 556 seconds slower with the 2 0 axle ratio However MPH improved Drag Racing Analyzer v3 0 Performance Trends GT5 0L a Back Graph Print Analyze Histo Help F1 r Notes Summary High Clutch Slips i Motes FP Very Low Tire Traction Low l Motes FPN for more Details here to show Test History Log OoOO e UNAa A YNNN NNN Figure 4 8 shows an ET of 15 149 at 95 14 MPH with an improvement of 556 seconds actually a 556 second slower ET However MPH actually did improved 17 MPH with the 2 0 axle This shows a big increase in ET slower as we expected The negative impro
21. specs are not that critical unless you are estimating a performance improvement by modifying Front Wheel Tire weight or diameter If the measurements were not available you could have simply selected Let Program Estimate for the Type For Rear Wheel Tire Specs select Pick Example Wheel Tires from the list of Types Select the Example Goodyear Superstock 32 x 14 Drag Slicks The Wheel amp Tire specs menu should now look like Figure 4 21 126 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 4 Examples Figure 4 21 Wheel Tire Specs Menu Front Wheel Tire Specs Rear Wheel Tire Specs Type Use Specs Below Type Ex Tire Goodyear SuperStock 32x E II Tee Diometor in J etd free Diameter oaa7 ead Help Construction Drag Slicks gt Outside diameter of the tirefs Click on Cle button to calculate from tire size specs p 34 Tread Width in ia cic Traction Factor 69 70 cite Tire Growth Bo cic Note Traction Factor can be changed without the program changing the Rear Tire Type Other Rear Tire specs are considered unique to the tire type and can not be changed without the program changing the name of the Rear Tire Type back to Use Specs Below Driving Specs At the Driving Specs menu you see most of the specs are disabled indicating these values will not be used in the calculations Leave the Launch Specs Type set to Computer Driven No Tire
22. the calculated value s at the top of the menu will be displayed This calculated value s will now be updated each time you change a spec If you want to use this calculated value click on Use Calc Value If the calculated value is within expected limits it will be loaded into the original menu If you click on Cancel you will be returned to the original menu with the original value unchanged If you click on Help you will be given a general explanation of calculation menus and a page in this section for more info about the particular menu you are using The input values or calculated values in any calculation menu have NO affect on calculated performance unless you load the Calculated Figure 2 20 Typical Calculation Menu Calc Power Curve Peak HP Peak Torque ft Ibs 75 Peak Torque RPM Performance Specs Type of Calc Quarter Mile MPH Vehicle Weight Ibs uarter Mile MPH Engine Cubic Inches we OO RPH at HP Peak Notes This calculation will produce approximate power curve specs based on very simple inputs It always uses the Std Dyno Corr Factor The Match Veh Performance option is a more exact way to build a power curve based on more vehicle amp performance specs Use Calc Value value into the original menu If you already know a spec in the form required by the program then you have no need to use the calculation menu For example if you know the engine ma
23. 125 126 Bog Engine 39 116 Bonneville 53 54 C RPM 58 C Slip 58 Calculate Performance 5 6 9 49 55 71 72 77 82 98 108 109 111 114 119 121 122 123 Calculate Performance Conditions 5 6 8 9 49 71 72 109 119 121 122 123 Calculation Menu 5 9 17 18 60 61 71 119 122 125 Index Calculation Menus 5 9 17 18 60 61 62 71 119 122 125 Cam 5 9 11 CD 4 CG 29 Chain 27 65 66 Chain Calculations 5 Circumference 36 69 Cle button 9 17 18 27 29 32 36 37 42 51 60 61 62 65 70 71 81 82 86 123 125 137 141 Clutch Diameter 22 Clutch Force 22 148 Clutch Material 23 Clutch or Converter and Engine RPM 97 115 Clutch Converter 22 24 124 Comments 5 8 79 84 104 131 140 Computer Driven Launch 39 42 45 46 111 127 147 Construction Tire 36 37 74 117 120 163 Conv Tq Multiplication 24 58 116 118 124 148 Converter 1 2 16 21 22 23 24 40 41 45 46 47 58 59 74 75 97 111 115 120 124 143 146 147 148 149 150 152 153 Converter Capacity 2 23 40 45 46 74 124 147 148 149 152 153 Current Run 56 Data to Graph 97 Density Altitude 52 106 Dew Point 1 9 18 51 71 72 73 121 123 145 Dial In 6 1 13 71 82 83 84 86 132 133 134 135 136 137 138 141 154 Diameter 61 Diff Lock Eff 27 125 Differential 27 28 65 Directory 2 4 108 Disabled 16 22 28
24. 2 8 Calculation Menus 60 2 9 Match Vehicle Performance 74 2 10 Throttle Stop Prediction T7 2 11 Dial In Prediction 82 2 12 Example 87 Chapter 3 Output 91 3 0 Test Results 91 3 1 Analysis Report 93 3 2 Graphs 95 3 3 Vehicle Library 99 3 4 Printer Output 103 3 5 History Log 105 Chapter 4 Examples Example 4 1 Finding the Best Axle Ratio Example 4 2 Using the Match Vehicle Performance Option Example 4 3 Predict Bracket Racing Dial In Example 4 4 Predict Throttle Stop to Run Index Appendix 1 Accuracy and Assumptions Appendix 2 General Tips Appendix 3 Version 3 2 Features Appendix 4 Version 3 4 Features Index 107 108 119 132 138 143 147 154 163 169 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 1 Introduction Chapter 1 Introduction 1 1 Overview of Features The Drag Racing Analyzer program by Performance Trends Inc is a software system to let drag racers performance enthusiasts and even the average driver understand and predict many aspects of full power vehicle acceleration The Drag Racing Analyzer Version 3 has been designed to be easier faster and more accurate Several new features have been added and other features enhanced The major changes in Drag Racing Analyzer Version 3 are listed below New Features e Mouse driven user interface compatible with Windows and Window 95 for easier operation and better print capability e Lots of example engines tra
25. 2 previous runs with different throttle stop settings which produce at least 3 seconds difference in ET e Using 001 Sec Increments instead of 01 Sec Increments in the Preferences menu lets the program make 60 foot ET and Throttle Stop predictions in thousandths of a second Important See Appendix 3 page 155 for new features in Version 3 2 which make Throttle Stop Predictions easier 142 C Performance Trends Inc 1998 Drag Racing Analyzer Appendices Appendix 1 Accuracy and Assumptions Background The Drag Racing Analyzer was developed as a e Tool to help predict effects of certain engine and vehicle modifications for engine builders drag racers and performance enthusiasts e Theoretical Drag Strip to allow anyone to try things which are too expensive difficult dangerous or impossible with a real vehicle e Learning aid for those who want to better understand vehicle dynamics during full power acceleration The Drag Racing Analyzer will provide you an engineering estimate of what should occur when general modifications are made based on the principles of vehicle dynamics and physics By seeing all the specifications which go into the calculated results you may have a false sense that the computer knows your vehicle exactly what manufacturer s torque converter you are using who built the chassis what your 4 link settings are etc Actually the computer does not know if the specifications are for a production Yugo
26. 440 127 53 90 spr stck v6 Sun pr 1998 3 56pm 1320 10 470 3 126 63 30 38 gt5 0l FriApr1 98 5 0 1320 13 802 96 25 10 gt5 0l Fri pr 17 98 4 5 1320 f 13 729 96 15 1 50 gt5 0l Fri pr 17 98 4 0 1320 13 713 97 66 60 gt5 0l Fri pr 17 98 3 5 1320 13 726 97 06 25 Click on Test Title 1st column to change it or to retrieve specs which produced those results Click in other columns for definitions 128 C Performance Trends Inc 1998 Match Vehicle Performance Feature The program is currently predicting your car runs slower than your actual car runs We should fine tune these specs to get a better match between real time slips and what the program predicts In previous versions of Drag Racing Analyzer and in other programs on the market this would mean doing a lot of cut and try Adjust a spec see if you got a better match on say 60 foot time If you did now did you screw up your MPH ET etc The solution is the Match Vehicle Performance option available at the Main Menu Return to the Main Menu from the Test Results screen of Figure 4 23 Click on the Match Veh Perf button at the top to display the menu similar to Figure 4 24 Enter in your actual performance including the engine RPM as you go through the traps at the end of the quarter mile of 7500 RPM It should look like Figure 4 24 Then click on the OK adjust veh specs to match performance button
27. Accuracy From reading the assumptions above and scattered throughout this manual it is obvious several important aspects of vehicle performance are glossed over Therefore it is impossible to make exact predictions of what will happen to your vehicle when modifications are made It should be possible to adjust the Drag Racing Analyzer to match your vehicle s performance see Example 4 2 and Appendix 3 to agree with your vehicle s results within 03 seconds at all points on the track However even after this a modification may not be simulated completely accurately For example you specify a higher stall converter and the program predicts a 4800 RPM stall and a 1 second ET improvement You install the converter and obtain the 4800 RPM stall speed predicted by the Drag Racing Analyzer However the converter exhibits more high speed slip due to a poor design than what the Drag Racing Analyzer assumes and your actual ET drops 1 second The program is still accurate based on its assumptions its just that your parts do not fit its assumptions 001 Sec Increments Increasing the time resolution choosing 001 Sec Increments in the Preferences menu tells the program to do the calculations in much smaller time steps This does improve the mathematical accuracy somewhat However it does not increase the program s overall accuracy significantly This is primarily due to the program s assumptions and tolerance bands for iterations remaining
28. Clutch Disks let the program estimate it by selecting the Type called Let Program Estimate Clutch Specs 22 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions Clutch Material Is the material of the clutch disk either organic sometimes called a rag clutch which is an older style material or metallic which is common in most racing clutches If you do not know the Clutch Material let the program estimate it by selecting the Type called Let Program Estimate Clutch Specs Converter Capacity Describes the size or capacity of the torque converter in units of RPM per square root of torque ft lbs The higher the capacity sometimes called K factor the higher the converter slip for a given amount of input torque High capacity converters are generally smaller in diameter have internal blade modifications and are rated by their stall RPM for a given amount of engine input torque Stall RPM is the engine RPM at full throttle when the converter output RPM is 0 which occurs with the transmission in gear with the drive tires not turning trans brake is On Technically if you know the engine s torque at stall Converter Capacity can be calculated by the following equation Stall RPM Converter Capacity _ StallRPM y Engine Torque Stall High capacity torque converters are used in drag racing primarily to allow the engine to rev into it s high RPM power band at the line However high capacity co
29. Description Compound 95 Good Dr ag Strip with Traction Con npounr e 90 Tire on Good Concrete e 85 Tire on Average Concrete e 80 Tire on Good Asphalt Select a general description of your track You will likely have to fine tune your choice to get oe ieot Aega nsphal your actual 60 ft times to match the computers oe You can use the Match Vehicle Perf option to This menu is different than other Calculation have the computer adjust this spec to match your menus in that there is not calculation 60 ft times performed but you are simply picking a Traction Factor from a list of descriptions Use Calc Value The Traction Factors in this list are very general You will probably have to fine tune this spec based on your vehicle s actual 60 ft times The program can also determine Traction Factor with the Match Vehicle Performance command at the Main Menu 2 8 7 Calculated Shift Figure 2 28 Calculated Shift RPMs RPMs This Calculation menu is available by clicking The program would use these RPMs for shifting on the Shift RPMs Clc button in the Driving Current Calculated Specs menu There are no inputs to this menu You are simply telling the program to calculate 5000 5300 what it would use for Shift RPMs As Figure ae pae 2 28 shows you can then choose to use load in 5000 5200 these Calculated Shift RPMs Do you want to use these calculated shift RPMs 70 C Performance Trends Inc 1998 Drag Racing Analyzer Ch
30. Ford Thunderbird Race 1989 Ford SuperCoupe Stock 1995 Ford Lincoln Mark VIII Stock 1997 Dodge Dakota RT Stock 2001 Dodge Dakota RT Stock 2001 Ford Lightning F 150 Stock 2002 Ford Focus S YT Stock Cobra Stock List Alphabetically typical listing C List by Dyte Last Changed Chosen Vehicle File 1968 Plymouth GTX Preview CID 440 320 HP 4600 Pk Tq amp HP 3 Speed Auto Trans Wt 4240 Axle Ratio 3 23 Rear Whi Dry Fint Area 22 Drag Coef 5 1968 Plymouth GTX 440 Single 4 BBL Factory rating is 375 HP at 4600 RPM 480 ft lbs 3200 RPM We ve derated these numbers to be more realistic as most all factory ratings before 1972 were too high zi Show Only Files which contain this phrase Cancel Help Show All Files x Note the use of much longer more descriptive file names available in Version 3 2 Open a Vehicle File 37 Vehicles in Library 10 20 2002 2001 Ford Lightning F 150 Stock 10 20 2002 1995 Ford Lincoln Mark VIII Stock 10 20 2002 1989 Ford SuperCoupe Stock 10 20 2002 1985 Ford Thunderbird Race 10 19 2002 2003 Ford Mustang Cobra Stock 10 19 2002 2002 Ford Focus SYT Stock Choose this option and the files you most recently worked with are listed at the top of the list of vehicles C List Alphabetically typical listing List by Date Last Changed Open Delete Cancel Help Chosen Vehicle File 2002 Ford Focus SYT Preview CID 121 171 HP 7000 full
31. Please respect the programmer s copyright and do NOT give out copies to your friends Important The body of this manual covers v3 0 s features Check Appendix 3 and 4 for new features added in v3 2 and v3 4 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 1 Introduction 1 3 A Word of Caution The Drag Racing Analyzer is a comprehensive software package which estimates a vehicle s performance based on limited user input These estimates can be used for analysis of drag strip or normal street performance A vehicle is a very complex system which makes exact calculations of all details impossible Therefore several simplifying assumptions are made to reduce the calculations to a manageable level See the Assumptions in Appendix 1 The user must recognize The software can not predict the safety of a vehicle modification or driving situation Done correctly with the proper quality parts and safety precautions extreme vehicle conditions can be safe Done by inexperienced racers with standard or low quality parts a drag car can be a disaster waiting to happen Please read and follow the Safety Notes as highlighted in this manual The software like any computer model can NOT make exact predictions because Much of the input data to the software is estimated Even if the input data were exactly correct the simplifying assumptions within the program will limit the accuracy Environmental conditions driver performance
32. Previous Runs Previous Run 1 The first run can be made with a very short throttle stop setting perhaps only 2 seconds On Based on your experience we make run with the throttle stop timer set for 75 seconds and record the weather 60 foot time ET and the throttle stop setting Previous Run 2 The second run must produce at least a 3 second increase in ET Ideally it will produce an ET approximately equal to or slightly slower than your desired or Index ET Again based on your experience adjust the throttle stop timer to be on for say 1 5 seconds Make a run like this and record the weather 60 foot time ET and the throttle stop setting It is critical that the difference in the throttle stop settings for these 2 Previous Runs produce at least a 3 second difference in ET Fill in the data for these 2 Previous Runs as shown in Figure 4 35 140 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 4 Examples Predict Throttle Stop For your first round the air continues to improve You measure the weather as e 1415 feet altitude or Elevation e 75 degrees e 68 6 relative humidity e 7 MPH side wind The weather specs for both the Previous runs and the Predicted run are shown in Figure 4 35 For this round you are getting the left lane which everyone is complaining is 02 seconds slower for 60 foot times Knowing this you select You enter predict 60 foot time below for Estimate Change in 60 Foot Time
33. Racing Analyzer Chapter 3 Output Dial In Predicted Run This is the program s prediction of your Dial In setting to run the Index ET If this is blank click on the Clc button by it or Update Prediction in the menu bar at the top of the menu The Dial In is not saved because its value will change depending on what the other vehicle specs in the program are set to You will have decide if you want to use this predicted Dial In as is or subtract off a safety factor of say 010 020 seconds or so The more you subtract off the Dial In the less likely you are to break out run faster than your Dial In and be disqualified For example if you are up against a novice opponent and the program is predicting a 9 655 Dial In you may want to use a 9 635 9 655 020 Dial In This gives you a 020 second cushion or safety margin to prevent breaking out 86 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 3 Output 2 12 Examples Many of the specs which the Drag Racing Analyzer uses to predict performance are difficult for some users to get For that reason the program comes with sets of Example specs which the user can load in automatically and easily Figure 2 35 Using Component Examples If you are curretly using a set of Example specs the name of the Example will appear here You can also click on this combo box to pick a new example or switch the Type to Use Specs Below Should you decide to change any
34. Racing Analyzer s results can closely match the results of most any specific vehicle e The program has several options for entering specs like picking example specs from preloaded lists or by calculating them using Calculation menus from other known information or measurements e You can make most any file from the Vehicle Library match your vehicle s specs following this procedure Then you can save all these specs under a new name in the library for use at any time in the future 131 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 4 Examples Example 4 3 Predict Bracket Racing Dial In Important See Appendix 3 page 155 for new features in Version 3 2 Features Introduced and suggested background reading e Predicting detailed performance changes based on weather changes Section 2 7 e Dial In Prediction Menu Section 2 11 One place computers are widely used is in Bracket Racing where the racer must accurately predict their ET before the race This predicted ET is called the dial in and is used for setting starting handicaps Example 4 3 will demonstrate how to use the Drag Racing Analyzer for determining your dial in Matching Your Vehicle s Performance The first step is to get the computer results to match your actual drag strip results For Example 4 3 we will use the 1971 Monte Carlo file which was developed in Example 4 2 This file is in the Vehicle Library under the name EXAMPLE4 2 so click o
35. Z06 Coupe M aT Dia Caef 36 ge Challenger 2dr Coupe Rebel e asi 2011 Dodge Charger RT Stock 2011 Dodge Challenger 2 Dr Coupe SRTS 2011 Dodge Charger SRT8 Stock 6 4L 8 Engine 6 Speed Manual 2011 Dodge Charger Stock Transmission 2011 Ford Mustang 2dr Cpe W 200 Pound Driver 2011 Ford Mustang 2dr Cpe GT Courtesy of Road and Track Online Picture Courtesy of SupercarsHD com List Alphabetically typical listing C List by Date Last Changed Sh Only Fil hich i tea Doan Bean MN cies UE 167 C Performance Trends Inc 1998 Drag Racing Analyzer Appendices 168 C Performance Trends Inc 1998 Drag Racing Analyzer Appendices 4 wheel drive 28 60 foot time 7 13 75 77 80 81 82 85 129 134 136 137 140 141 142 60 foot sec 80 81 85 Accel Gs 1 58 97 144 Acceleration 1 29 36 37 57 58 63 143 144 146 149 151 Accuracy 3 Aerodynamics 32 33 120 147 148 Air Temperature 51 84 121 123 All Wheel Drive 28 Altimeter 1 50 51 52 80 140 Analysis Report 5 1 91 93 94 Aspect Ratio 69 Assumptions 6 3 18 28 30 31 35 41 52 58 62 136 143 145 146 Axle Ratio 6 108 113 117 120 Background Color 98 Barometer 1 50 51 52 79 84 106 123 134 140 Baseline 1 8 95 96 97 98 108 116 151 Baseline XE Baseline is a Selected Run 98 Bearing Size 62 Beginner 13 39 Body amp Axle 5 11 26 34 35 63 65 66 67 88 113 120 122
36. again because of less traction problems the clutch is released faster e The run is made in only 2 gears and finishes the run during the 2 3 shift Click on Back to return to the Test Results screen then click on History and Clear History You will see all the History rows blanked out except the current 2 0 axle ratio results Another useful feature of the History Log is the ability to change the Test Title in the first column to anything you want Click on the Test Title for the 2 0 axle ratio run then answer No to the question Retrieve the specs which produced these results You will be shown a test input box like that of Figure 4 11 You will find the ability to Retrieve specs which produces certain results in the History Log to also be a very useful feature Figure 4 11 Editing Test Title to Track Modifications Click on Test Title answer No to the question to edit change it Drag Racing Analyzer v3 0 Performance Trends GT5 0L i Back raph Print Analyze History Help F1 ied Edit the Notes Summary High Clutch Slip 4 i name here Tire Traction Very Low Click on J 4 6 In this case Notes for more Details we changed the year ito the axle ratio ito record the modificatio Some History rows are blank vst 25 because we 95 89 95 45 Cleared 95 35 History gt6 0l Fri Apr 17 98 2 0 95 14 Click on Test Title 1st column to change it or to retrieve specs which produced those results Click in other c
37. applied to the front tires Therefore steering control can be adversely affected creating unsafe conditions This information is not readily available but can be estimated by measuring the distance from the ground to a spot approximately 5 inches above the center of the engine s crankshaft at the front of the engine typical V 8 camshaft level Estimate the Height of CG of motorcycles as half way between the rider s shoulders and the engine s crankshaft For example if the height of the rider s shoulders is 40 and the crankshaft centerline is 14 the Height of CG would be 40 14 2 27 Obviously driver position has a significant effect on this parameter 29 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions Wheelbase Is the distance in inches from the center of the front wheels to the center of the rear wheels Decreasing the wheelbase will improve weight transfer and therefore traction and E T on a rear wheel drive car Rear Track Width in Is the distance in inches from the center of one rear tire s track to the center of the other rear tire s track This value is used in conjunction with Frt Roll Stfns for determining how RWD vehicles lift the right rear tire For front wheel drive cars certain assumptions are made about the suspension and this value is disabled Frt Roll Stfns Figure 2 9 Estimate of Rear Track Width Track Width 30 C Performance Trends Inc 1998 Dr
38. by reducing the weight of the wheels and tires reducing rotating inertia but then adding ballast to the car so the total weight stays the same This is a case where you do not want the vehicle weight changed by the amount you lightened the wheels and tires 13 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions Engine Graph Thick Lines Engine Graph Thin Lines Lets you customize the way the Full Power Curve graph in the Engine specs menu is displayed and printed 14 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions 2 2 Engine The Engine specs describe the engine s size in cubic inches its torque and HP and what power correction was used for rating the engine s torque and HP Figure 2 4 Engine Specs Menu shown with Full Power Curve Click here to set the amount of detail you want to give the program about the power curve For beginners we strongly recommend selecting Peak HP Only or picking example power curves General Engine Specs Torque and Base ngine Specs Full Power Curve HP graph based on data in table below Method of Describing Power Curve ified Full Curve Peak Torque f Abs zzo BPM Peak Torque 13200 Peak Homsepdwer 210 EEX APM amp Peak HP 4400 ConFactor fae 236 77a El M Help Click on down arrow button to pick method level of detail for describing the engine s power curve p xx
39. current track weather conditions Many racers like this number for comparisons It basically means for a standard 29 92 barometer 60 deg 0 humidity day what altitude would give the same barometric pressure as the current track conditions Dry Dnsy Alt Dry Density Altitude in feet above sea level of the current track weather conditions sometimes called Corrected Density Altitude corrected for humidity It basically means for a standard 29 92 barometer 60 deg 0 humidity day what altitude would give the same oxygen content as the current track conditions This is a better measure than Density Altitude for your car s true HP potential 60 ft Imprvmnt ET Imprvmnt MPH Imprvmnt Are the test results for the particular run The Imprvmnts are the improvement of a particular run over the previous run Imprvmnt is left blank if the previous run was not for the same Feet distance as that particular run in the History log If the Feet distances are 5280 1 mile or 7040 ft the distance of El Mirage the 60 foot time is actually the 660 foot 1 8 mile time If the Feet distance is are 26400 the distance of Bonneville the 60 foot time is actually the 2 mile time 106 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 4 Examples Chapter 4 Examples Each of these examples become progressively more complex assuming you have performed and understand the preceding example Section 1 5 s example is somewhat more basic
40. future when you do not have results from 2 previous runs Simply click on File then Open and pick a Throttle Stop file with weather conditions or track conditions fairly similar to those you will be running Again be sure the current vehicle specs match your vehicle you are running IMPORTANT This method of using a past saved Throttle Stop file is not nearly as accurate as using previous runs from the same track same day and same weather instruments See Section 3 3 for how to Open or Save vehicle files Saving or Opening Throttle Stop files work much the same way There are 2 general sets of commands which let you copy sets of data from 1 run to another These are e The Edit command where you can Copy or Clear various runs e The Advance command where you move runs from right to left as you would when your Predicted run now becomes your Previous Run 2 on which you will predict a new run Remember Previous Run 1 and the new Previous Run 2 should have at least 3 seconds difference in ET 2 10 2 Definition of Inputs Weather Inputs Corr Barometer Hg Obs Barometer Hg Air Temperature deg F Relative Humidity Dew Point deg F 79 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions Elevation ft Altimeter Method of Recording Weather Data These are all explained in Section 2 7 1 starting on page 50 All 3 runs must use the same Method of Recording Weather Data That is because th
41. made of the input specs for unusual combinations like a shift RPM higher than the engine s maximum RPM a clutch that is too small for the engine etc In this case the program sees no problems and the calculations proceed The program will display the Calculation Progress indicator as calculations progress When the calculations are finished the performance results will look like Figure 4 3 You now see a screen with columns of numbers describing the GT5 0L s run through the quarter mile At the top in the right corner is a summary of the run and any improvement between the current run and the last run The Last run can be from the last time you ran the program The program remembers results from different sessions between shutdowns and start ups 109 C Performance Trends Inc 1998 Drag Racing Analyzer Figure 4 2 Vehicle Library Drag Racing Analyzer v3 0 Performance Trends GT5 0L vehicle Calc ET F2 Help F1 Preferences About Cale er Hatch Yeh Perf Throttle Stop Dial In Quit Retrieve Yehicle File 25 Vehicle in Library Chosen Yehicle File gt5 01 i altere d jt drags ter lotus cn vit mustang Preview CID 302 Wt 3200 4400 HP 210 Axle Ratio 3 08 Pk Tq amp HP Rear Whi Drv 5 Speed Frnt Area 21 Manl Trans JE Figure 4 3 Test Results Drag Racing Analyzer v3 0 Performance Trends GT5 0L mR RWWWWNNNNS Ww Back a Print Analyze History Help F1
42. of the Example s specs from Driveline Layout to Drag Coefficient the name will be changed to simply Use Specs Below BodyjAxle Specs Vehile Weight Body Details Vehicle Weight bs Type Ex Body 6568 Monaro Biq Boy A l riveli out Rear Wheel Drive Axle Specs Driveline Lay F Wt on Rear Ti inal Drive Ratio cie airos 44 Cid Help Rear Track Width in 56 The weight of the vehicle with the driver in pounds Frt Roll Stfns No Fmt Sway Br 2 p kx Frontal Area sq ft ERG cid Drag Coefficient C Click on the Get Example button or on the Type combo box and select Pick an Example to bring up a list of example specs Click here to save the current specs as an Example with a name of your choosing Not available is current specs are already an Example 87 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 3 Output E EE ey At the top of most component sections of the Drag Racing Analyzer s menus you will find a description of the Type of component used In Figure 2 35 the component section is the Body Details in the Body amp Axle menu This combo box can 2 or 3 choices e Use Specs Below e Pick An Example e Ex Body 65 68 Mustang Big Block or some other name of a specific example Figure 2 35 shows that the current Body Details specs are those picked from the Drag Racing Analyzer s Example specs for a 65 68 Big Block Mustang
43. se The approxiperte time from the release of time the z the trapeftake or clutch pedal until the Altimeter with Rel Hum l 9 91 thyetfe stop comes on This gives the throttle T S Start Time program a general idea if the throttle stop stop first comes on early or late in the run p xx comes L 139 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 4 Examples General Specs and Comments Method of Recording Weather Data For this example we are using e An altimeter which is corrected to 29 92 mercury e A mercury thermometer for air temperature e A dial hygrometer which reads out in Relative Humidity e Wind speed and direction you obtain from a hand held wind speed meter and compass The Method of Reading Weather Data of Altimeter and Rel Hum exactly matches your instrument package so select it Note that the Barometer input is disabled You will enter your altimeter reading as Altimeter in feet of altitude Your throttle stop timer is set to come on 3 seconds after the trans brake releases so enter 3 for T S Start Time You are running in the 9 90 index class However instead of typing in the 9 90 index you type in 9 91 to give yourself a 010 second safety margin for breaking out If you run too quick you break out and loose Should your car run up to 010 seconds faster than you expect you still will not break out Load In 2 Practice Runs Recommended Steps for Recording
44. sq ft Drag Coefficient e Not all specs have Examples available and some Example categories have very few examples from which to choose These features will expand with later updates e The specs in these Examples are approximate Different pieces of hardware and later designs may have different specs producing very different results You will be more accurate if you use your own figures from your own tests or the latest information from the manufacturer e No checks are made to see if your combination of Examples is physically possible You can choose to put Ford Toploader transmission gear ratios behind a 5 HP Briggs amp Stratton engine in a Prod 82 Corvette body type This may be an interesting what if but you must realize this hardware will NOT bolt together 90 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 3 Output Chapter 3 Output The Drag Racing Analyzer provides several ways to view and output the test results including e Tabular calculated Test Results displayed on the screen Check Section 2 7 for definitions of Test Results Analysis Report giving tips warning of safety issues etc High resolution graphs Printer output or reports or graphs Vehicle Library for recording sets of vehicle specs for later use Figure 3 1 Output Options from Test Results Screen Menu Bar showing names of options Vehicle File Name Drag Racing Analyzer v3 0 Performance Trends GT5 0L Back Graph Print Analyze istor
45. the Main Menu to display the current power specs for the Super Stock V 6 Change Displacement to 502 Then select the Method of Describing Power Curve which makes the most sense e Ifyou had a complete dyno curve you could Figure 4 14 Calc Menu for HP pick Specified Full Curve and enter the dyno curve in the right hand section of this screen e You could pick an Example Power Curve and Peak HP try to find something that you think would be Peak Torque ft Ibs close to your big block Chevy Peak Torque RPM e Ifyou know very little about the engine or a ae Performance Specs power curves in general it is probably best to pick Specified HP Only This option lets the Type of Calc program decide the shape of the power curve Vehicle Weight Ibs This is the one you pick Quarter Mile MPH Now to estimate the amount of HP coming from this Engine Cubic Inches engine click on the Clc button by the Peak HP spec Vol Et fe You will see the Calculation Menu of Figure 4 14 Most all the input specs are disabled dimmed to gray BPS ee Pook and they do not respond to inputs except Type of Calc Click on this combo box and select Quarter Mile MPH This calculation will produce approximate power because you know this but you do not know Eighth ale specs raa m very ae ce always uses the yno Lor Factor e Mile MPH or you would have to estimate Vol Eff Now iach Gah Paine ce ANa several specs are enabled T
46. the top of the main screen then Display User s Manual The manual is in a high quality PDF format The Performance Trends website is now available from inside the program by clicking on Help at the top of the main screen then Performance Trends on the Web A Print button and Windows Print Setup button or menu option have been added to many screens to let you print these individual screens An Optimize button has been added at the top of the Main Screen which lets you instantly find the best torque converter if transmission is an automatic or final drive rear axle ratio for quickest ET Two new calculation menus have been added one to convert engine size from CCs or Liters to cubic inches and the other is to estimate the vehicle weight of your car based on some popular car models C Performance Trends Inc 1998 Drag Racing Analyzer Appendices The recent results section of the results screen now includes 60 ft time and the improvement for the current and previous run A summary Time Slip similar to what you get at the drag strip is available in the results screen for the current results and available for any of the 25 runs in the history log Commands in the History Log have been updated and streamlined Now when you click on a row in the History Log you are now presented with 4 command options Open Rename Help or Time Slip The Dial In and Throttle Stop screens have a new spec of safety margin which the program use
47. tire cross sectional height to cross sectional width A 75 series tire has a height 75 as high as its cross sectional width and is generally a tall tire A 50 series tire is a lower profile tire more suited to cornering and performance Figure 2 26 Rolling Radius Wheel Rim Diameter Is the diameter of the wheel s rim Rolling Radius in Is the tire s radius measured with the Radius tire mounted on the car with the tire on the ground with typical vehicle weight on it Radius is the distance from the center of the tire to the ground See Figure 2 26 Note that this is the only calculation where the diameter is not reduced by 3 because the load is already deforming the tire This is usually the most accurate way to Calculate the Tire Diameter Circumference in Is the tire s circumference measured in inches Circumference is the distance around the outside of the tire on the tread 69 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions 2 8 6 Estimated Traction Factors This Calculation menu is available by clicking on the Traction Factor Clc button in the Wheel Tire menu Click on the combo box to be Figure 2 27 Traction Factors presented with the following choices e 110 Best Possible Suspension Setup Estimated Traction Factors amp Track Estimated Traction Factor e 100 Best Drag Strip with Traction Compound E ate P E OS e 95 Good Drag Strip with Traction Pick Track amp Suspension
48. tire specs as is and e Increase Engine Power Curve specs e Increase Clutch Force lbs for manual transmissions especially if CSlip is high in gears other than 1st gear e Increase Efficiency in the Transmission Specs menu e Decrease Shift Time in the Driving Specs menu 148 C Performance Trends Inc 1998 Drag Racing Analyzer Appendices To decrease ET and decrease MPH e Increase Converter Capacity for automatic transmissions To increase ET with little effect on MPH or 60 ft time e Increase Shift Time e Decrease Shift Throttle for manual transmissions e Choose some less than optimum shift RPMs in the Driving Specs menu e Change the shape of the HP curve Another Tip By adjusting Shift RPMs you can simulate most any acceleration For example let s say you want to know the time to accelerate from 50 MPH to 80 MPH in 3rd gear Adjust the 2 3 SHIFT RPM until the vehicle starts 3rd gear after the 2 3 shift at exactly 50 MPH Then adjust the 3 4 SHIFT RPM until the vehicle starts the 3 4 shift at exactly 80 MPH The time between start and end of 3rd gear is 3rd gear s 50 80 MPH time Using Dynamometer Data for Engine Power Curve Specs Engine Power Curve specs are discussed in Section 2 2 Dynamometer tests which measure engine performance can be done in different ways How the test is done can over estimate or under estimate the engine s torque and HP in the vehicle The Drag Racing Analyzer works best if you ente
49. tse SpecsBeon E Driveline Layout Rear Wheel Drive g Axle Specs Height of C G in Diff Lock Eff Wheelbase in Help Rear Track Width in 57 The weight of the vehicle with the driver in pounds Frt Roll Stfns Modern Production pHs Frontal Area sq ft Drag Coefficient WtonR Ti Final Drive Ratio 3 08 cite E od Posi Vehicle Weight Vehicle Weight Ibs Total vehicle weight in pounds with the driver For accurate predictions the weight you enter here is critical 26 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions Axle Specs Final Drive Ratio For rear wheel drive vehicles this is the rear axle ratio for front wheel drive vehicles this is the gear ratio of the final drive gear or chain system in the transaxle For chain drive vehicle s go carts motorcycles etc this is the chain ratio For motorcycles with a gear reduction between the engine and the transmission you must multiply the chain ratio by this gear reduction to obtain the total Final Drive Ratio Click on the Clc button to obtain a menu to calculate Final Drive Ratio based on number of teeth for your particular situation This information is available in magazine articles owner s repair manuals on tags attached to the vehicle or coded into the vehicle s identification number One method of estimating the final drive ratio of a rear wheel drive vehicle without
50. 0 12 133 1 MPH Weight w driver 3200 Vehicle Weight lbs in Body amp Axle vee es seem Rear axle wt w driver 1400 Wt on Rear Tires in Body amp menu Aerodynamic Cd Drag Coefficient in Body amp Axle a E specs menu Example Converter gt Rear Axle Ratio 4 56 Final Drive Ratio in Body amp Axle Specs menu s Converter ye menu menu Drag Slicks in Wheels Tires menu Wheels Tires menu Wheels Tires menu Wheels Tires menu a ee Track Conditions Weather Instruments Radio Weather Report Method of Recording Weather Data Radio TV Weather Report with Dew Point ET 1 4 mile 10 12 eot e G O MPH 1 4 mile 188 0 G O Observed RPM 1 4 mile 7200 O Observed Stall RPM 4500 o O Barometric Pressure 29 46 Baro Pressure Hg in Calculate mee a eeenecsconannanan 120 Transmission Turbo Hydra Matic 400 Transmission Type Pick Example Transmission C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 4 Examples E Wet Bulb Temp Performance Conditions menu Dew Point deg F in Calculate Performance Conditions menu Head Wind MPH in Calculate Performance Conditions menu Head Wind Direction Headwind Wind Speed Headwind in Calculate Performance Conditions menu From your own weather station instrument measuring actual not corrected barometric pressure O Track Elevation 860 Elevation ft in Calculate Performance Conditions menu Engine specs Click on Engine specs at
51. 0 foot timing lights In this menu you can enter e Your vehicle s actual 60 ft time and ET for 2 previous runs The weather and wind conditions which produced these results Your vehicle s throttle stop setting for these 2 runs Your desired ET for the third run or Index to Run The weather and wind conditions for the third run where you want to run the Index Optional Your prediction of the 60 foot time for the Predicted run When all these have been entered click on Update Throttle Stop or the Cle button by Throttle Stop The program will make 3 passes simulating the 2 runs you have already made and the 3rd run you want to predict Based on these results the program will calculate the throttle stop setting to produce the desired ET for the third run or Index to Run 77 C Performance Trends Inc 1998 Figure 2 33 Throttle Stop Menu Weather and ET for 2 previous runs with significant difference in throttle stop settings Menu bar of commands to open or save a file of Throttle Stop specs copy specs from 1 run to another update the prediction etc Drag Racing Analyzer Chapter 2 Definitions Weather conditions for Throttle Stop prediction to run the Index ET Current Vehicle file This must be the vehicle these Throttle Stop Specs are for gt Drag Racing Analyzer v3 0 Perfoyfarlce Trends SG GRAND AM Me a O Verano Ze st TE Throttle Stop Prediction Exit File Edit Advance Upg te Predid File THRTL
52. 14 98 8 07 am i j 48 43 00 gt5 0l Tue Apr 14 98 7 18 am i 3 16 48 43 46 50 gt5 0l Mon pr 13 98 9 57 pm i 94 93 4 43 69 mach1 Fri pr 10 98 10 48 am 4 i H 99 36 1 70 69 mach1 Fri pr 10 98 9 56 am X 5 j 101 06 00 69 mach1 Thu Apr 9 98 6 45 pm M 101 06 51 Click on Test Title 1st column to change it r to reNeve specs which produced those results Click in other columns for definitions Click here to return to the Main Menu Click here to view and or edit the Vehicle Comments C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 3 Output 3 1 Analysis Reports When calculated test results are displayed on the screen you can obtain an Analysis Report by clicking on Analyze in the menu bar The Analysis report consists of 1 3 pages of suggestions for improving performance safety warnings etc concerning the performance results calculated See Figure 3 3 and 3 4 for examples Figure 3 3 First Portion of Analysis Report Drag Racing Analyzer v3 0 Performance Trends GT5 0L Me Back Graph Print nalyze History Help F1 Notes Summary High Clutch Slip Tire Current ET 1457 MPH 94 93 Traction Low Click on Notes for more Last 30 69 Detail ponrowernent 5 Analysis Report Analysis Report Wt HP Ratio 15 24 corrected for weather at track Comparison of this vehicle s performance to a typical race vehicle This Yeh Typ Veh Advantage 60 foot sec 2 30 1 79 51
53. 30 31 36 37 39 40 41 50 51 61 123 124 127 140 Displacement 16 63 120 121 152 169 C Performance Trends Inc 1998 Drag Racing Analyzer Appendices Distance 1 29 30 35 36 37 54 56 57 58 67 69 75 106 109 150 Distance of Race 75 Dnsy Alt 106 Drag Coefficient 32 33 120 147 148 Drag Slicks 36 37 117 120 Drag Strip 3 53 56 57 111 113 132 134 138 147 Driveline Layout 28 34 35 Driving Specs 5 38 41 42 70 111 117 120 127 128 147 148 149 Dry Bulb 1 9 51 71 72 73 121 123 Dry Density Altitude 52 106 Dry Dnsy Alt 106 Dynamometer 3 18 Dynamometers 16 17 62 121 147 149 Efficiency 24 28 36 147 Eighth Mile MPH 62 63 El Mirage 53 54 Engine 4 5 1 6 11 14 15 16 17 18 19 20 22 23 24 27 29 32 39 40 41 42 43 44 45 46 47 50 57 58 59 60 61 62 63 64 65 66 74 76 90 94 97 100 101 102 103 109 111 112 113 115 116 119 120 121 122 124 129 136 143 144 145 146 147 148 149 150 151 152 Engine Analyzer 1 11 17 18 19 20 Engine Cubic Inches 60 61 63 Engine File 100 Engine Graph 14 Engine Library 6 99 100 Engine RPM 1 23 39 40 42 43 45 46 47 57 58 76 97 111 112 115 116 129 148 149 151 EngRPM 58 Estimate Change in 60 Foot Time 80 81 85 136 141 ET Timer 54 57 ET sec 80 85 Example 5 6 1 4 5 9 13 16 17 18 19 22 23
54. 40 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions Launch Time sec Is the amount of time the clutch and throttle are feathered at the start of the run until the Launch Clutch and Launch Throttle reach 100 In other words this is the amount of time the Launch Clutch and the Launch Throttle are in effect After this amount of time the clutch is released completely 100 and the throttle is opened to WOT wide open throttle or 100 This specification is disabled if you are using a computer driven launch Shift Specs Shift Time sec Is the amount of time it takes the driver to shift This is the total time starting from the moment the clutch is disengaged to when the clutch pedal is released after the shift Click on the down arrow button of this combo box to select the time and description to best match your condition If the transmission has a torque converter the program assumes this is the time required for the automatic transmission to shift Smooth shifting production automatics are designed to take more shift time than race automatics See Driving Specs Summary at the end of this section Shift Throttle Is the amount of throttle given the engine during the shift process in the same manner as specified under Launch Throttle Ifthe Shift Throttle is specified as 100 the throttle is held at WOT during the shift and the engine will rev up between shifts Ifthe throttle is backed off bet
55. 69 272 15 149 556 95 14 gt5 0l Thu Apr 16 98 9 47 pm 1320 294 618 2297 272 14 593 556 94 97 Note showing gt5 0k Thu Apr 16 98 9 34 pm 1320 294 618 2569 272 15 149 556 9514 additional test History Log gt5 0l Thu Apr 16 98 8 56 pm 1320 294 618 2 297 000 14 593 000 94 97 gt5 0l Thu Apr 16 98 7 48 pm 1320 294 618 2 297 _ 897 14 593 4 793 94 97 Click on Test Title 1st column to change it or to retrieve specs which produced those results Click in other columns for definitions Figure 4 10 Clutch or Converter and Engine RPM Drag Racing Analyzer v3 0 Performance Trends GT5 0L P A Back Print Options Graph Data Types revious run with Drag Racing Analyzer 3 08 axle Current Clutch or Converter run with REM 2 0 axle Notice less clutch slip and the drop in Engine J Base Clutch or RPM off Converter RPMI the line bog due to less 7 Base Engine RPM chance of tire spin 115 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 4 Examples Graph these results with the Baseline 3 08 axle results for the graph in Figure 4 10 Figure 4 10 points out a couple of things e Engine RPM drops to 2000 RPM during the launch possibly bogging the engine That s because with less torque multiplication in the rear axle the computer releases the clutch much faster because traction is not a problem This pulls down engine RPM during the launch e The clutch locks up stops slipping much faster
56. 8 154 163
57. Adjustment Factor is a measure of how much affect your throttle stop has on your vehicle s ET It is measured by making 2 different runs with 2 very different throttle stop settings say one where the throttle stop is on for 5 seconds and another where the stop is on for 2 5 seconds These are not runs where you will try to run your index and are best run during a test and tune session Your objective is 158 C Performance Trends Inc 1998 Drag Racing Analyzer Appendices E to produce 2 very different ETs hopefully 300 to 600 seconds different than each other These 2 runs should be done with no other vehicle changes and ideally with very little difference in the weather conditions Take the weather conditions and results for these 2 runs and load them into the Throttle Stop screen as Run 1 and Run 2 Put in most any conditions for the Predicted Run and click on the Cle button to update the Throttle Stop Prediction and you will be given the Adj Factor for Run 1 and Run 2 This Adj Factor can now be used for predicting Throttle Stop settings If you make significant changes to the vehicle throttle stop settings or the time the throttle stop comes on say it was 1 5 seconds into the run now it is 2 5 seconds into the run you must obtain a new Adj Factor based on 2 runs with very different throttle stop settings with this new change Figure A4 New Calculation Menus Est Vehicle Weight Vehicle Weight Estima
58. At the start the brakes or trans brake are released and the throttle is maintained at 100 The drive axle s brakes are then feathered as necessary to limit power to the driving tires to deliver maximum power to the tires without breaking them loose 3 When the engine RPM reaches the 1 2 Shift RPM the automatic shifts to 2nd The engine RPM drops as much as is required for the next transmission gear The throttle remains open 100 during the shift and the drive axle s brakes are again feathered as required to put maximum power to the tires without allowing tire spin 4 The third step is repeated for each transmission gear until the vehicle finishes the run Note This method of launching will give the best possible E T and MPH in most cases for the given vehicle description and driving specs with a torque converter 45 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions Figure 2 16 Converter Launch Type Computer Driven No tire spin E HeiptF1 Throttle 2 Throttle being maintained at 100 for entire run Drag Racing Analyzer v3 0 Performance HeiptF 1 Clutch 2 Axle torque being limited by brakes to prevent tires from spinning ee cmn s i i i i i i i Note These graphs are available by selecting Clutch and Throttle as the Graph Data Types Torque Converter Launch Type Use Specs Below 1 The engine is brake torqued at the converter s stall RPM Stall RPM i
59. Chapter 4 Examples Name of Vehicle the program is currently working with The current specs may have been changed and be different than the Vehicle in Library of the same name Click on the vehicle you want to Open to see a Preview Double click to Open immediately Preview of chosen highlighted vehicle Click here to show Vehicle Library Performance Summary Notes Summary High Clutch Slip Tire Current ET 14 593 Traction Low Click on Ngtes for more Last 9 800 Details Improvement 4 793 PNOO OWU OOA on Poos use NANN aN showing ET and MPH Notes pointing out important things about this run Click on Notes button or Analyze for more info Click here or here to Graph Finish ET and MPH from data columns C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 4 Examples Note the ET of 14 597 seconds with a MPH of 94 97 at the top of the report with the stock 3 08 axle However in the columns of numbers you see Feet 1320 Time 14 597 sec but MPH 95 7 not 94 97 This is because a drag strip has timing lights spaced 66 feet apart at the end of the quarter mile These lights are used to determine the vehicle s speed at the end of the run Even though the GT5 0L was doing 95 7 MPH at 1320 FEET it only averaged 94 97 MPH over the last 66 ft of the 1320 FEET See Section 2 7 2 Calculate Performance Output Other important things to look for in the Test Results screen include Not
60. Drag Racing Analyzer v3 4 for Windows Users Manual Performance Trends Inc Performance Trends Inc 31531 W Eight Mile Rd Livonia MI 48152 Sales amp Tech Help for Registered Owners 248 473 9230 Fax 248 442 7750 Email feedback performancetrends com Website tips correspond with other users download demos update schedule etc www performancetrends com Copyright Notice Copyright C 2011 Performance Trends Inc All Rights Reserved These software programs and user s manual are reserved by Performance Trends Inc and are intended for the use of the original owner only Copying or duplicating these products except for the personal use of the original owner is a violation of U S Copyright Law and is hereby expressly forbidden Portions Copyright C Microsoft Corp All Rights Reserved DISCLAIMER OF WARRANTIES THE SOFTWARE PROVIDED HEREUNDER IS LICENSED AS IS WITHOUT ANY WARRANTIES EXPRESS OR IMPLIED INCLUDING BUT NOT LIMITED TO ANY WARRANTIES FOR MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE NO ORAL OR WRITTEN STATEMENTS REPRESENTATIONS OR OTHER AFFIRMATION OF FACT INCLUDING BUT NOT LIMITED TO STATEMENTS REGARDING CAPABILITY CAPACITY SUITABILITY FOR USE OR PERFORMANCE OF SOFTWARE SHALL BE RELIED UPON BY USER OR BE DEEMED TO BE A WARRANTY OR REPRESENTATION BY PERFORMANCE TRENDS INC FOR ANY PURPOSE OR GIVE RISE TO ANY LIABILITY OF OBLIGATION OF PERFORMANCE TRENDS INC WHATSOEVER USER ACCEPTS ALL RESPON
61. Figure 2 3 Here you can Preferences adjust some program items to personalize the 01 Sec Increments runs faster aia ce v 001 Sec Increments more exact A Beginner Level Sec Increments v Experienced Level Click on 01 for times like ET 60 foot time Dial In predictions etc to be given to the nearest hundredth of a second This will have calculations run about 5 times faster If you have a faster computer and or want better precision select 001 for times to be calculated to the nearest thousandth of a second Beginner Experienced Level If you select Beginner the program will lock out the more complicated features make more checks on specs assuming you could be making mistakes and gives more explanation before an action is performed assuming you may not be familiar it We strongly recommend this choice to anyone new to computers or this program Remind on Tire Wt Change Select this option and the program checks if you have made a significant weight change to the wheels or tires in the Wheels Tires menu If you have the program will ask if you want the same weight change to be made to the total vehicle weight For example if you are installing lighter wheels and tires on your street car you probably want the vehicle weight lightened by the amount the wheels and tires are lighter than the original ones However if you are running a class where your vehicle weight must remain at a certain level you can gain an advantage
62. Inc 1998 Drag Racing Analyzer Appendices Inertia 16 34 47 150 151 152 Install 4 70 Installation 5 4 9 113 InstantCalc 155 161 163 167 Jet 13 Know 61 Know Relative Humidity 71 Last Run 56 Launch 38 39 40 41 42 43 44 45 46 47 59 75 111 113 116 117 127 147 148 Launch Clutch 40 41 44 Launch Throttle 40 41 44 46 59 Launch RPM 39 40 42 43 44 117 148 Launch Time 40 41 43 44 45 46 47 Length 61 Let Program Estimate Clutch Specs 22 23 74 Letter Tire Size 69 Library 5 6 9 91 Lifter 6 13 Load from Eng Anlzr 18 Main Menu 4 5 6 9 11 13 19 37 49 56 74 77 82 100 108 109 113 114 119 121 125 129 130 138 Match Vehicle Performance 5 1 17 37 74 75 119 129 130 131 Method of Describing Power Curve 16 17 121 Method of Recording Weather Data 50 71 72 80 85 140 Metric Tire Size 69 Motorcycle 28 32 35 MPH 1 7 23 53 56 57 58 61 62 63 76 77 82 97 106 108 111 114 119 120 121 122 125 129 132 133 134 138 141 143 144 148 149 151 Open 1 2 5 23 32 79 84 99 100 108 132 138 Optimum 1 33 42 117 127 143 149 Optimize 154 Outside Air Temp 72 Peak Horsepower 16 17 60 61 62 129 Peak HP Only 16 17 Peak Torque 16 17 61 62 Peak Torque and HP Only 16 PERFTRNS PTI 2 4 102 108 Pick An Example 88 Piston Dome 60 Piston Dome CCs 60 P
63. L L _ _ L_ _ x _ _ x_ E gt SSS SS u Type Click on the down arrow button of this combo box to be presented with the following 3 choices e Computer Driven No tire spin e Use Specs Below not available in Beginner Level and quite difficult to work with e Clutch Maintain Launch RPM No tire spin a second computer driven option available for clutches only Depending on you choice of Type some or all of the other Launch Specs will be enabled or disabled These types are explained below Computer Driven No tire spin The computer will hold the engine at full power and feather the clutch to put the most power to the ground but still prevent the tires from slipping For transmissions with torque converters the computer will hold the engine at full throttle and feather the drive axle s brakes to limit the power to the drive tires just enough to prevent tire spin This is similar to current production anti spin traction control Selecting Computer Driven No tire spin is the easiest way to launch the vehicle and make comparisons between vehicle modifications This Type of launch may not always give the best ET For example with very sticky tires and a clutch the computer may release the clutch too quickly because the tires are not in danger of spinning This may cause engine RPM to drop too much at the line perhaps slightly bogging the engine which can actually occur with the re
64. MPH Esme ear Tire Diameter The vehicle s MPH at the ire Construction Type end of the run either eighth ae Traction Factor or quarter mile This is ire Growth sometimes called trap speed or speed through the Return to Old Specs traps 75 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions Finish Engine RPM The engine s RPM at the end of the run or at the same time when Finish MPH is recorded If you are not sure of this RPM or you do not want the Tire Diameter adjusted leave this spec blank or set it to zero Finish Trans Gear The transmission gear at the end of the run or at the same time when Finish MPH is recorded 76 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions 2 10 Throttle Stop Prediction A throttle stop is a throttle activator which closes the throttle a certain amount for a programmed amount of time a programmed amount of time after the clutch switch or trans brake switch is activated at the start of the run Many Super Class racers use throttle stops to control their car s performance to run their index ET Couple all the settings available for the throttle stop and weather and wind variations consistently running the Index ET is complicated See Example 4 4 The Drag Racing Analyzer s Throttle Stop Prediction screen will help you decide how to adjust your throttle stop timer for winning consistency Click on the Throttle Stop button at the to
65. SIBILITY FOR SELECTING THE SOFTWARE TO MEET USER NEEDS OR SPECIFIC PURPOSES PERFORMANCE TRENDS INC IS UNDER NO OBLIGATION TO FURNISH USER UPDATES OR ENHANCEMENTS EVEN IF FURNISHED TO OTHER USERS Continued on next page LIMITATION Of LIABILITY If at the time of delivery to the original User only there are any defects in the media on which the Software is provided User s sole and exclusive remedy shall be the replacement of any media returned to Performance Trends Inc within 90 days of the receipt of the Software by User or at Performance Trends Inc s sole option a refund of the License fees paid to Performance Trends Inc by User IN NO EVENT SHALL PERFORMANCE TRENDS INC OR THIRD PARTIES WHO HAVE RIGHTS IN THE SOFTWARE BE LIABLE TO USER FOR LOSS OF PROFITS INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES EVEN IF PERFORMANCE TRENDS INC IS AWARE OF THE POSSIBILITY OF SUCH DAMAGES IN THE EVENT ANY REMEDY HEREUNDER FAILS OF ITS ESSENTIAL PURPOSE OR IN ANY OTHER EVENT PERFORMANCE TRENDS INC S LIABILITY HEREUNDER SHALL NOT EXCEED ANY AMOUNTS PAID BY USER TO PERFORMANCE TRENDS INC UNDER THIS AGREEMENT Some states do not allow the limitation or exclusion of liability for incidental or consequential damages and some states do not allow the exclusion of implied warranties so the above limitations or exclusions may not apply to you No action regardless of form arising out of any claimed breach of this agreement or perfo
66. SP Previous Run Run 1 ezoa moo Corr Baro Hg Air Temp deg F Dew Point deg F Elevation feet Wind MPH Wind Direction Throttle Stop 60 foot sec ET sec Pfedicted Run Run 2 29 07 Corr Baro Hg Dew Point deg F ezoa Elevation feet Wind MPH Side Wi Wind Direction Side Wind 1 95 Estimate Change in 60 Foot Time Let Program Estimate 60 ft time G teat sec 1 405 1 38 ad Throttle Stop General Specs and Comments Method of Reading Weather Data Radio TV Report withDewPt Index sec Help Barometer reading in inches of TZS Start Time Comments you can enter to describe data These are useful reminders when you open a saved Throttle Stop File Type of weather instruments you are using Index ET or the ET you want to run plus any safety margin The Throttle Stop setting the program recommends to run the Index C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions This menu is almost like a separate program because you can enter comments in the lower left corner to describe what these specs represent You can then Save these specs by clicking on File in the Menu Bar then Save or Save As Save As lets you save these specs under a new name where Save simply updates the current name with any changes By saving sets of specs you can predict throttle stops in the
67. Spin This is the easiest way to get nearly optimum launches without having to constantly adjust the launch specs Also leave Shift Time at 4 Shift Kit as the SPR STCK V 6 was using Set the 1 2 Shift RPM and 2 3 Shift RPM to your shift RPMs of 7400 for both Driving Specs should now look like Figure 4 22 At last we ve adjusted all specs as close as we reasonably can Now return to the Main Menu and calculate Performance You obtain an ET of 10 426 a MPH of 127 93 and a 60 ft of 1 510 all 3 which are close but slightly slower than what you actually ran 127 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 4 Examples Figure 4 22 Driving Specs Menu Launch Specs Shift Specs Type Computer Driven No tire spin Shift Time sec Launch Chitch C Shift RPMs Use RPMs below Launch Throtde ico Het 29 Shit RPM Ed eae on arrow button to pick type of launch from list 3 4 Shik BPM fo Figure 4 23 Results for First Try Drag Racing Analyzer v3 0 Performance Trends SPR STCK V6 Back Graph Print Analyze History Help F1 F Notes Summary Click on Notes for more Current ET 10 426 MPH 127 93 Cmts Details Last 10 440 127 53 l Improvement 014 40 Sea lime MPH __JAccel Ga feet JC RPM inoRPM ta Mut calp TSn Zihi t 1 RO 1 1 2 2 2 2 3 3 3 3 3 e Fea a A E a E T Hier spr stck vB Sun Apr 1998 4 11 pm ma 10 426 127 93 40 E spr stck v6 Sun pr 1998 4 06pm 1320 E 4 10
68. Tre a 5 HelpiF i latch 25 ws Sec T IT 3 0 Clutch during shifts l Program adjusts Clutch to avoid tire spin di oo 6 10 12 Note These graphs are available by selecting Clutch and Throttle as the Graph Data Types 5 The third step is repeated for each transmission gear until the vehicle finishes the run Notes The Launch Time starts the moment the clutch is released not when the E T clock starts For example if the Launch Time was specified as 1 0 second and there was a 3 second rollout the Launch Time would be over at 7 seconds on the E T clock If the first shift takes place before the Launch Time is over the clutch and throttle are still controlled per the Launch Specs into Gear 2 until the Launch Time has run out 43 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions Clutch Launch Type Use Specs Below 1 The engine is held at the Launch RPM 2 At the start the clutch is engaged as hard as specified by the Launch Clutch and the throttle is opened as specified by the Launch Throttle The Throttle and Clutch are gradually increased from the starting percents so they are at 100 at the end of the Launch Time 3 When the engine and clutch RPM both reach the 1 2 Shift RPM the clutch is disengaged the throttle is opened as specified by the Shift Throttle the gears are changed from 1st to 2nd and when time has passed as specified by the Shift Time the cl
69. Wt Ibs at 50 and Tire Diameter at 24 9 Aggressive Launch Launch RPM changed to 5000 in the Driving Specs menu Power Shifts Shift Time reduced to 2 Fast and Shift Throttle increased to 100 Power Shifts in the Driving Specs menu ea 4 13 History ul 7 at ati GT5 0L Set Up for Serious Racing eaaa ee teen ee oe ee ra Ok Fidpri7 98 5 0 7 7 13 802 073 196 25 at5 0 Fri Apr 17 98 4 5 13 729 016 96 15 1 50 gt5 0l Fri Apr 17 98 4 0 7 13 713 013 97 66 60 gt5 O Fri Apr 17 98 3 5 i 13 726 086 97 06 25 gt5 0l Fri Apr 17 98 3 0 I i 13 812 384 97 30 1 85 gt5 Ol Fri Apr 17 98 2 5 133 14 196 701 95 45 38 gt5 0l Fri Apr 17 98 2 0 i 3 14 897 838 95 84 60 Click on Test Title 1st column to change it or to retrieve specs which produced those results Click in other columns for definitions 117 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 4 Examples Figure 4 13 shows that lower higher numerical axle ratios do improve ET when the vehicle has enough traction to take advantage of the extra torque multiplication Figure 4 13 shows the best ET of 13 713 occurs with gear ratio of 4 0 Conclusions e The Drag Racing Analyzer allows you to easily maneuver between screens and menus with the click on a mouse e The program has several useful features like 001 Sec Increments time for improved accuracy the Performance Summary and History Log to track you changes and the Notes and Graphs to un
70. ag Racing Analyzer Chapter 2 Definitions e L R mK m ee Roll stiffness is the suspension s resistance to leaning as it goes through a cornering maneuver Part of the vehicle s total roll stiffness comes from the front suspension and the rest comes from the rear Frt Roll Stfns is the percent of the vehicle s total roll stiffness present in the front suspension For example if the vehicle has a heavy rear anti sway bar with stiff rear shocks and no front anti sway bar with soft front springs and shocks only 25 of the vehicle s roll stiffness may be from the front suspension This particular set up is good for planting both rear tires on the ground for good traction with a rear wheel drive car Assume the Frt Roll Stfns is 75 typical of most production cars unless special modifications have been done to the suspension for drag racing Then reduce it to a value of 25 50 For front wheel drive cars certain assumptions have been made about the suspension and this value is disabled Frontal Area sq ft The frontal area is the area in square feet the vehicle s silhouette occupies when viewed from the front Use the formula in Fig 2 10 to estimate frontal area Frontal areas are in the range of 5 sq ft for a motorcycle to 20 sq ft for a small passenger car to 30 sq ft or more for a full size pick up truck Also see Section 2 8 4 for calculating Frontal Area sq ft by clicking on the Clc button Figure 2 10 Estimate of Frontal Ar
71. ain Menu Notice at the top of the screen that the current Vehicle file is a GT5 0L 85 Mustang If it is not GTS OL or if you think the current GT 5 0L s specs have been changed you can Open up this Vehicle file by clicking on the Open button as shown in Figure 4 2 Open the Vehicle file GT5 0L shown in Figure 4 2 If you have made any changes to the vehicle which originally appeared at the top of the Main Menu the program will first ask you if you want to save these changes Answer No and you will be returned to the Main Menu with the GT5 0L specs loaded into the program If you have a faster computer Pentium you may want calculations done in a slower but more precise way This can be done by clicking on Preferences at the top of the Main Menu Figure 4 1 then selecting 001 Sec Increments These increments will be used for all examples Click on the different categories of vehicle specs or the Calculate Performance button on the Main Menu Since we want to see the effect of changing the axle ratio on this vehicle we first need to get a baseline test A baseline is a performance test before the modification Therefore if you examine the contents of any component menus leave all current values as they are 108 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 4 Examples Figure 4 1 Main Menu Click Preferences to select 001 Sec Increments for results instead of the faster 01 Sec Increments Drag Racing Analyzer v3 0 P
72. al vehicle See the Clutch Maintain Launch RPM No tire spin option below Use Specs Below The computer will drive exactly as specified by the other Launch Specs which may allow the tires to break loose and spin This Type useful for fine tuning your particular launch strategy or to see how much the vehicle s E T suffers when the tires break loose Clutch Maintain Launch RPM No tire spin This is very similar to Computer Driven No tire spin in that the computer will hold the engine at full power and feather the clutch to put the most power to the ground but still prevent the tires from slipping The difference is the computer will also not allow engine RPM to fall below Launch RPM potentially eliminating engine bog This option is only available if the transmission is using a clutch 39 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions Launch RPM Is the RPM at which the engine is held at the starting line before the clutch is released This specification is ignored if the vehicle has a torque converter because the Converter Capacity spec and available engine torque will determine the launch RPM or stall RPM Launch Clutch Is the amount the clutch is feathered at the starting line at the beginning of the Launch Time The program then increases this amount until it is at 100 at the end of the Launch Time This is a change from previous versions of Drag Racing Analyzer but seems to
73. ample 4 1 Click on Preferences in the Main Menu and select 001 Sec Increments You will notice the program warning you that the results may change slightly because you are now asking for higher resolution time calculations We will calibrate the program for a 1971 Monte Carlo with a 502 cubic inch big block and 400 Turbo Hydra Matic The car runs 10 12 ETs at 133 1 MPH There are no vehicles in the Vehicle Library exactly like this so we will have to build our own The 69 MACH1 is approximately the right size and is an automatic but it is a production car The SPR STCK V 6 is a 2 speed automatic with a V 6 engine but is already set up for drag racing We choose to start with the SPR STCK V 6 file Once you are finished following Example 4 2 you should have a set of specifications which should match the file EXAMPLE4 2 in the Vehicle Library If we had chosen the 69 MACH1 calibrating would follow the same basic procedure and the results would have been equally as accurate You just have to change more specs First you must have results from a good run where you know the track conditions likeTable 4 2 Next open a fresh copy of the SPR STCK V 6 from the Vehicle Library by clicking on the Open button at the top left of the Main Menu as shown in Example 4 1 Enter the Monte Carlo s specs into the program as follows 119 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 4 Examples Table 4 3 1971 Monte Carlo Running 1
74. an the RPM at Peak HP If you have no information on RPM at Peak Torque we recommend you select one of the example curves select the Method of Describing Power Curve of Peak HP Only to eliminate this spec or click on the Cle button to calculate Peak Torque from other inputs Peak Horsepower This is the maximum horsepower value for the vehicle s engine This information is listed in magazine articles in an owner s manual repair manual or from dynamometer tests See Appendix 2 If this value is not known one of Performance Trends Engine Analyzer programs will help you measure or estimate the engine s maximum horsepower If you have no information on Peak Horsepower we recommend you select one of the example curves or use Calculation Menu by clicking on the Clc button or use the Match Vehicle Performance option and let the program estimate your peak HP RPM at Peak HP This is the RPM at which the peak HP occurs This is listed in magazine articles in the owner s repair manuals or dynamometer tests with the peak torque value for example 189 HP 5200 RPM The RPM at Peak HP must be higher than RPM at Peak Torque if you are using the Peak Torque spec If you have no information on RPM at Peak HP we recommend you select one of the example curves or estimate it at an RPM 500 RPM less than your shift RPM Corr Factor Since engine performance is strongly influenced by weather conditions it is important to specify the conditions which gi
75. and allows you to estimate a vehicle s frontal area Figure 2 24 Calc Frontal Area Calc Frontal Area sq ft Track Width inches Calc Frontal Area sq ft Is the distance from the center of one front tire Yehicle Dimensions to the center of the other front tire This value z is initially set to the Rear Track Width in the Track Width inches Body and Axle specs menu but can be changed Roof Height inches to most anything you want Note This calculation is only an approximation of Frontal Area based on 2 easily obtained j i measurements For most situations MPH less Roof Heig ht inches than 150 Frontal Area will not have a large effect on performance and this approximation is The distance in inches from the ground to highest portion of the roof or vehicle in inches which extends nearly the full width of the Se ae vehicle For example for a truck with a roll bar behind the cab measure to the top of the roll bar but not to the top of one of the spot lights mounted on the bar However if so many lights are mounted on the bar that 67 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions they are nearly continuous for the full width of the vehicle it may be more accurate to then measure to the top of the spot lights 2 8 5 Tire Diameter Figure 2 25 Calc Tire Diameter Tread Width Calc Tire Diameter inches 241 e This calculation is available from the Wheel a
76. apter 2 Definitions 2 8 8 Calc Dew Point deg F Depending on your choice of Method of Recording Weather Data you will be entering either Dew Point or Relative Humidity in the Calculate Performance Conditions menu or in the Throttle Figure 2 29 Calc Dew Point Stop or Dial In menus These humidity inputs at all these menus have a Clc button This is the Adada L LaLa Calculation Menu you will get if you are using Calc Dew Point Dew Point Weather Inputs Know Relative Humidity eee ve Outside Air Temp deg F If you know the relative humidity of the air and the air temperature select Yes Otherwise Outside Rel Humidity select No to input Wet and Dry bulb Di Bulb Temp geg E temperatures from a psychrometer Depending on your choice the appropriate inputs are Wet Bulb Temp deg Use Calc Value enabled Outside Air Temp deg F Is the outside air temperature when the relative humidity measurement was made For example if the weather service or weather report gives a relative humidity of 56 and a temperature of 68 degrees use 68 degrees Outside Rel Humidity Is the air s relative humidity as reported by a weather service or measured by humidity instruments Dry Bulb Temp deg F Is the temperature of the dry bulb thermometer on the psychrometer in degrees F This is also the temperature of any thermometer mounted in the shade when the Wet Bulb Temp reading is taken The Dry Bulb Temp m
77. ave selected the options Graph with Baseline and Baseline is a Selected Run 98 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 3 Output 3 3 Vehicle Library The Drag Racing Analyzer allows you to save a set of vehicle specifications to the Vehicle Library under a name of your choosing You can then open these vehicles out of the Vehicle Library in the future for comparison or modification The Open window is shown on the next page with explanations Figure 3 7 Vehicle Library Options Click on Open button or File vehicle then Load to display Vehicle Library shown here Save option also available after clicking on File vehicle Click on Save button to save current Vehicle specs to Library l Drag Racing Analyzer v3 0 Performance Trends GT5 0L Total Vehicles le Calc ET F2 Help Fl Pret efences About in Library P aa Name of chosen Vehicle currently highlighted in Vehicle List Preview of Vehicle chosen Click and drag slide bar to view all vehicles in list Single click on vehicle to choose it for preview Double info on option click to immed Click here to iately open it open the chosen Click here to delete chosen Vehicle Click here to bring up on screen help Click here to close the Vehicle Library with No chanaes without openina a vehicle 99 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 3 Output
78. be more realistic Launch Clutch specifies how much of the total clutch force is allowed to grip the clutch disc or put another way how far the clutch pedal is released For example if the clutch is dumped or side stepped at the starting line with no feathering this would be called 100 Launch Clutch If you release the clutch until it just starts to bring the engine RPM down and you hold it there that could be specified as 10 Launch Clutch This specification is disabled if the vehicle has a torque converter or you are using a computer driven launch This spec can also be used to simulate the hydraulic or pneumatic clutch management systems on funny cars or top fuel cars Launch Throttle This describes how far the throttle is opened during the Launch Time The program then increases this amount until it is at 100 at the end of the Launch Time This is a change from previous versions of Drag Racing Analyzer but seems to be more realistic If the throttle is immediately opened to wide open throttle WOT this would be specified as 100 Launch Throttle Trans brake vehicles where the throttle is WOT but the transmission output is locked would also use 100 If the throttle is only opened to half throttle this would be specified as 50 Launch Throttle This specification is used for both clutch and torque converter transmissions but is disabled if you are using a computer driven launch which eliminates tire spin
79. bels you can enter or change in this section of the Graph Options window Current Run s Label Baseline Run s Label Plot Title Click on these 3 text boxes to enter or change the labels or the graph title You must select Use Labels Given Here before you can enter or change any of these specs 96 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 3 Output Print Black and White Color Select either Black and White or Color to tell the program how to print the graph Unless you have a color printer you should choose Black and White The program always graphs in color on the computer screen Print Now Click on the Print Now button to print the current graph on the printer the same as selecting the Print menu command Data to Graph Click on this combo box for the following list of Data Types to graph e Engine RPM MPH Feet Accel Gs Engine HP Clutch see Figures 2 14 2 17 on pages 43 48 Throttle see Figures 2 14 2 17 on pages 43 48 Clutch or Converter and Engine RPM useful to check for clutch or converter slip See Section 2 7 for more information about these data types Plot Lines Thick Thin This section lets you pick the thickness of the graph lines Thick lines may show up better on the screen but thin lines let you spot minor differences more easily This spec also affects how the graphs are printed 97 C Performance Trends Inc 1998 Drag Ra
80. c transmission shifts the Drag Racing Analyzer uses Shift Time to define how quickly the valve body can perform shifts During a shift engine RPM drops and energy is released from this drop in engine RPM The program increases driveshaft torque to approximately simulate recovering the engine s and converter s inertia energy Inertia energy is the energy released when the engine and converter spinning at a high RPM before the shift are slowed down to a lower RPM after the shift This inertia energy is responsible for the vehicle s jump forward during shifts possible spinning the tires The shorter the Shift Time the harsher the shift and the greater the driveshaft torque from recovering inertia energy 47 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions 48 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions 2 Calculate Performance 2 1 Calculate Performance Conditions At the Main Menu you can calculate performance by 1 Clicking on Calculate Performance to open the Calculate Performance Conditions menu then clicking on Calculate Performance 2 Clicking on the Calc ET button at the top of the Main Menu 3 Pressing the lt F2 gt key from anywhere in the Main Menu If you click on Calculate Performance you will first be presented with a menu of conditions which describe how you will run this vehicle These conditions include e Weather and wind conditions e Total track
81. ce Trends Drag Racing Analyzer v3 4 On Windows 7 and Vista computers it can be C Program Files x86 Performance Trends Drag Racing Analyzer v3 4 102 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 3 Output 3 4 Printer Output The Drag Racing Analyzer can print the tabular test results for a permanent hardcopy by clicking on Print in the menu bar or the Printer button The menu of options shown in Figure 3 9 will appear Check the options you want to use for the printout by clicking on any or all of the top for boxes All options and buttons are discussed in this section Figure 3 9 Printer Command and Menu of Printer Output Options The Windows Printer Setup option lets you choose the printer or printer driver being used by Windows and also the page orientation Report Printing Options Printout Options Click on Print or X Include Vehicle Comments the Printer Button x Request Report Comment for the Printout Include 25 Test History Options menu Drag Racing Analyzer v3 0 Performance Other Printout Types Back Graph HIE Analyze i Print Results os Print Blank Worksheet Print Blank Workshe ft Tip aa Windows Printer Setup F See page 145 in Program Printer Setup Ctrl P manual for more info 0 479 4091 Include Vehicle Specs Select this options if you want all the current Engine specs Transmission specs etc printed with the results This will add 1 page to t
82. ce in Figure 4 30 there is a spec directly above the Dial In box called Estimate Change in 60 Foot Time In this example we let the program estimate how 60 foot time would change When you choose this the program basically assumes traction will stay the same and any change in 60 foot time is due to more or less engine power due to changes in air conditions It assumes the tires and track have the same traction as the Previous run However let say you believe that you will run a 030 second quicker 60 foot time than on the Previous run This may be due to one lane being stickier than another or other changes in the track conditions Under this condition a better choice for Estimate Change in 60 Foot Time may be You enter predict 60 ft time below Then the spec 60 Foot Time for the Predicted run becomes enabled and you can enter your estimate of what the 60 foot time would be Next Run Assume you win your first round For the next round s Dial In click on the Advance command at the top of the Dial In menu as shown in Figure 4 31 The program will copy all the weather information from the Predicted Run to the Previous Run and leave the Predicted run blank Fill in your actual ET and 60 foot time for this last run Assuming you ran 10 193 with a 1 528 60 foot time fill in these values Then fill in the weather for the next round into the Predicted Run column When finished click on the Figure 4 31 Dial In Menu After Using the Advance Co
83. cing Analyzer Chapter 3 Output Background Color This section lets you pick the background color of the graph either black or white Even if you select black the background color when you print the graph will be white in most all cases Baseline Graph with Baseline Graph without Baseline Click on Graph without Baseline for only the current run s data to be graphed Click on Graph with Baseline to have Baseline data plotted from a previous run for comparison You must click on Graph with Baseline before other options in this section are available Prvs Run Always Changes to Baseline Baseline is a Selected Run Click on Prvs Run Always Changes to Baseline and the previous data will be the baseline run plotted This is handy if you want to check the effect of every modification Simply make a change in a vehicle spec calculate performance and then make a plot and the difference in the last 2 runs will be graphed Click on Baseline is a Selected Run and one run remains the Baseline while you make several calculations When you first click on this option or the Select Current Run as Baseline button the current data is saved as the Baseline run This is handy if you have a particular combination you are trying to improve upon while making several changes Select Current Run as Baseline Click on this button to change the Baseline run to the current data This option is only available if you h
84. conditions e Allows you greater accuracy since you specify the wind conditions and do not rely on the program s assumed conditions Major Assumptions To make the Drag Racing Analyzer and the specifications which describe the vehicle containable on a personal computer several simplifying assumptions are made which are listed below Other approximations and assumptions exist as identified in Section 1 3 A Word of Caution and scattered throughout this manual Also see Assumptions in the Index e All vehicle components are assumed to be perfectly stiff which means e There is no delay in engine torque getting to the tires due to driveshaft axle or tire wrap up e There is no pitch rotation of the vehicle front lifting rear dropping due to the suspension s springs or shocks e There is no change in the Height of CG due to pitch rotation or the body lifting e Engine torque changes instantaneously with a change in throttle position In real engines torque changes are delayed from 1 to 5 seconds or longer from throttle changes 145 C Performance Trends Inc 1998 Drag Racing Analyzer Appendices e The torque converter s performance is typical of production 3 element hydrodynamic torque converters Actual converters especially those significantly modified can have performance characteristics that can be quite different than production converters e Clutch holding torque does not change with time temperature or clutch wear
85. ction Head Wind indicator Figure 2 19A Wind Direction Click on this combo box to select from the following wind directions Also see Figure 2 19A e Calm No Wind Head Wind Tail Wind Side Wind Corner Head Wind Corner Tail Wind Track Specs Track Length ft Click on this combo box to select from the following track lengths e 1320 Quarter Mile 660 Eighth Mile 5280 One Mile 7040 El Mirage 1 33 mi 26400 Bonneville 5 mi If you select 1320 ft the program also gives the MPH reading in the summary at the top as based on the 2 lights separated by 66 ft just as official drag strips You will notice this MPH is slightly less than that listed in the results at 1320 ft 53 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions If you enter 7040 ft the distance of El Mirage or 26400 ft the distance of Bonneville you get readings at the standard distances for timing reports at these tracks Also as you increase distance the time increments of the plots gets larger and the results get reported at larger distance intervals In the History Log the 60 ft time is replaced by 1 8 mile time for 5280 and 7040 and by 2 mile time for 26400 Rollout in Click on this combo box to select from the following rollout distances e 6 deep e 10 medium e 14 shallow short e 0 like data logger Rollout is the distance traveled by the vehicle during the process of uncovering the lights to start
86. curve 6 Speed Manl Trans Wt 2750 Axle Ratio 4 25 Fint Whi Dry Frnt Area 22 94 Drag Coef 35 2002 Ford Focus SYT 6 speed manual Unusual Getrag transmission produces 2 effective final drive ratios 4 25 and 2 88 We ve done the math to obtain the effective trans ratios assuming the 4 25 is Show Only Files which contain this phrase Pick a phrase to look for in the name of the file to be listed like Ford shown here or choose Show All Files to show all files in the library or type in most any phrase of your choosing 162 C Performance Trends Inc 1998 Drag Racing Analyzer Appendices 163 C Performance Trends Inc 1998 Drag Racing Analyzer Appendices Appendix 4 New Features in Version 3 4 Here is a brief listing of some of the features new in Version 3 4 164 Allows for a graphics file to be included with your vehicle data This graphics file can be printed separately or with your printouts At this time only JPG files can be added More Vista and Windows 7 compatible Program now better remembers Printer Changes and Printer Type Better at finding more and newer versions of Acrobat and Reader Preferences now has a global switch turn off Intro Help Tips InstantCalc Results ET amp MPH for each modification you make as they are made by the user are now shown on Main screen in Blue if selected in Preferences Prior to v3 4 InstantCalc results were only displayed in the individual Co
87. defined specs Weight 3600 Axle Ratio 3 73 Body Style User defined Rear Wheel Drive Front Wheel Tire s User defined Rear Wheel Tire s 11 1 x 27 0 Street Radial Launch Program will limit tire spin starting at 3000 RPM Shifts 4 sec Match RPM at Computer Picked RPMs Comments Picture 2011 Mustang 2dr Cpe Shelby GT 500 SVT 2 Door RWD 550 bhp 6500 RPM 510 lb ft 5400 RPM 17 23 mpg 4 passengers 3800 Ib Mfg Est 5 4 liter 8 cylinder Engine 6 speed Manual Transmission 3 73 Limited Slip Rear End rag Racing Analyze ord Mustang 2dr Cpe Shelby GT E Drag Racing Anal 2011 Ford M 2dr Cpe Shelby GT 500 File vehicle CalcET Help Preferences Reg To Kevin Gertgen Optimize Picture size gets adjusted as the screen is resized for various computer screens or display modes Click on File button to remove the picture insert a different picture or print the picture To change printer settings click on File at upper left corner of this main screen then Windows Printer Setup Open Vehicle Library Calculate ET Performance Dial In Optimize Save Vehicle to Library Match Vehicle Performance Throttle Stop Vehicle Specs Engine Transmission Body amp Axle Wheels amp Tires Driving Calculate Performance Help Move mouse over item for description to be given here Click on Help in menu line for more d
88. derstand and analyze your performance e The Drag Racing Analyzer allows you to simulate real world modifications by simply typing in new specifications which simulate the hardware modification e Like most other vehicle settings there is no single best axle ratio for the GTS 0L The best ratio will change depending on other vehicle specs for example like Tire specs which affect traction 118 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 4 Examples Example 4 2 Calibrating the Drag Racing Analyzer for Your Car Features Introduced and suggested background reading e Changing Calculate Performance Conditions Section 2 7 e Using Calculation Menus Section 2 8 e Adjusting specifications to match actual vehicle performance Appendix 3 e Using the Match Vehicle Performance Option Section 2 9 When using the Drag Racing Analyzer to predict the effect of modifications on a certain vehicle it is best to first calibrate the program to match the vehicle s actual results Calibrate means to fine tune an instrument the Drag Racing Analyzer in this case to improve its accuracy Once the program is calibrated its predictions are more likely to match your vehicle s response to modifications This example will be used as part of Example 4 3 also which deals with predicting Bracket Racing dial ins Since these dial ins must be adjusted for minor changes in weather we will use 001 Sec Increments as also done in Ex
89. dicted run now becomes your Previous Run on which you will predict a new run 2 11 2 Definition of Inputs Weather Inputs Corr Barometer Hg Obs Barometer Hg Air Temperature deg F Relative Humidity Dew Point deg F Elevation ft Altimeter 84 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 3 Output Method of Recording Weather Data These are all explained in Section 2 7 1 starting on page 50 All 3 runs must use the same Method of Recording Weather Data That is because the same exact instruments should be used for all measurements for the best accuracy 60 foot sec Previous Runs Is the 60 foot times for the previous run for your car at the track ET sec Is the ET you obtained for the previous run for your car at the track Estimate Change in 60 Foot Time Click on this combo box for 2 choices e Let Program Estimate 60 ft time e You Enter predict 60 Foot Time Below If you let the program estimate the 60 ft time it will assume nearly the same traction as the Previous Run If you want to enter your prediction of 60 ft time based on lane choice traction change through the day etc select You Enter predict 60 Foot Time Below Then the 60 foot sec input will be enabled where you can enter your own estimate 60 foot sec Predicted Run Is your estimate of the 60 foot time for the Predicted Run See Estimate Change in 60 Foot Time above 85 C Performance Trends Inc 1998 Drag
90. e Computer Driven No tire spin Clutch Launch Type Clutch Maintain Launch RPM No tire spin 1 The engine is held at the Launch RPM 2 At the start the throttle is opened 100 and the clutch is feathered to give maximum power to the tires without letting them slip If you selected to Maintain Launch RPM engine RPM is not allowed to fall below Launch RPM 3 When the engine and clutch RPM both reach the 1 2 Shift RPM the clutch is disengaged the throttle is opened as specified by the Shift Throttle the gears are changed from 1st to 2nd and when time has passed as specified by the Shift Time the throttle is opened 100 and the clutch is again feathered to give maximum power to the tires without breaking them loose If you selected to Maintain Launch RPM engine RPM is not allowed to fall below Minimum Launch RPM 42 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions Ea aS SSS SSS eee 4 The third step is repeated for each transmission gear until the vehicle finishes the run However if you selected to Maintain Launch RPM Engine RPM is allowed to fall below Launch RPM in all gears except Ist Figure 2 14 Clutch Launch Type Use Specs Below Drag Racing Analyzer v3 0 Performance Trends GT5 0L Print Options Graph Data Types Help F 1 Drag Racing Analyzer v3 0 Throttle o vs Sec Example of 50 Shift Throttle Starting at and maintaining 100 Throttle except shifts t t 6
91. e number of teeth on the smaller drive sprocket on the engine or transmission for chain drive systems In almost all cases this number will be smaller than Teeth Wheel Sprocket Teeth Wheel Sprocket This is the number of teeth on the larger driven sprocket on the wheel or axle for chain drive systems In almost all cases this number will be larger than Teeth Drive Sprocket Figure 2 23 Calc Wt on Rear Tires 2 8 3 Calc Wt on ie i Eao lt Wi on Hea Tres a Rear Tires Vehicle Weights This calculation is available from the Body amp Axle Specs menu and allows you to calculate a Total Vehicle Weight Ibs vehicle s weight distribution Weight on 1 Axle ia al Total Vehicle Weight Ibs Note These weights should all be obtained with the driver in the vehicle Is the total vehicle weight with driver as measured on a scale This initially set to the Vehicle Weight in the Body and Axle specs Use Calc Value menu but can be changed to anything 66 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions Weight on 1 Axle Is the weight recorded on the scale with the driver when only one axle s tires are on the scale either front or rear tires Which Axle Click on the combo box to choose either Rear or Front to identify which axle was on the scale for the Weight on 1 Axle measurement 2 8 4 Calc Frontal Area This calculation is available from the Body amp Axle Specs menu
92. e same weather instruments should be used for all measurements for the best accuracy Throttle Stop Previous Runs Is the throttle stop setting usually the time the throttle stop is on or is closing the throttles in seconds This is the adjustment you usually have the greatest control over and which gives the best consistency 60 foot sec Previous Runs Is the 60 foot times for the previous runs ET sec Is the ET you obtained for the 2 previous runs with the different throttle stop settings It is best if one of these runs is faster and one is slower than the Index and the difference in ET is at least 3 seconds Estimate Change in 60 Foot Time Click on this combo box for 2 choices e Let Program Estimate 60 ft time e You Enter predict 60 Foot Time Below If you let the program estimate the 60 ft time it will assume nearly the same traction as Previous Run 2 If you want to enter your prediction of 60 ft time based on lane choice traction change through the day etc select You Enter predict 60 Foot Time Below Then the 60 foot sec input will be enabled where you can enter your own estimate 80 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions 60 foot sec Predicted Run Is your estimate of the 60 foot time for the Predicted Run See Estimate Change in 60 Foot Time above Index sec Is the Index or your desired ET In the Super Classes there are usually 8 90 9 90 or 10 90 seco
93. e start of the 1 2 shift at 5000 RPM In these cases you may only get one reading either the 60 MPH point or the start of the shift at 5000 RPM In these cases there may also be some slight error in reporting the results For example if the 60 MPH point was reported it may show engine RPM at 5047 for the start of the 1 2 shift not the specified 5000 RPM These errors produce insignificant errors in the overall MPH and ET These discrepancies are reduced if 001 second time in the Preferences menu The following section defines each data column Gear Is the transmission Gear currently being used An RO indicates the rollout condition where the vehicle has moved the distance defined by Rollout If data is reported during a shift both gear numbers are given For example the 60 Feet point may show a Gear of 1 2 which indicates 60 feet occurred during the 1 2 shift Sec Shows the elapsed time since the Rollout distance was traveled If Rollout is specified as 0 this column shows the time since the vehicle first started to accelerate Negative values of Sec shows these conditions occurred before the Rollout distance was traveled For example if the first Sec value is 22 and the second value is 0 Gear RO it says the vehicle started the acceleration 22 seconds before the rollout condition was met which starts the ET timer If you want the timer to start the instant the vehicle starts to accelerate not like a dra
94. ea sq ft Vehicle Height Track Width Frontal Area sq ft Vehicle Height in X Track Width in 144 31 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions Drag Coefficient The coefficient of drag Cd is an engineering term used to describe how aerodynamic a vehicle s exterior design is how easily it slices through the wind A low value for the Cd indicates the car is aerodynamic and requires little power from the engine to overcome wind resistance Many automotive manufacturers now publish the vehicle s Cd in advertising since an aerodynamic car is a more fuel efficient car An aerodynamic car is also a faster car If the actual Cd of a particular vehicle can not be found use Table 2 1 to estimate the Cd for different types of vehicles Use Table 2 2 to estimate how much Cd will change from a modification A more complete list is by selecting one of the examples of Body Details Table 2 9 Estimate Drag Coefficient Cd Best Case vehicle Table 2 10 Estimate How Modifications Affect Cd and Cl lift coefficient Open Side Windows vsclosed 02 o y O OpenT Top amp SideWindows 08 4 Flat Air Dam width of vehicle 2 8 Flat Air Dam width of vehicle 00 50 1 Flat Spoiler width of vehicle 3 2 Flat Spoiler width of vehicle 00 25 4 Flat Spoiler width of vehicle Notes concerning Table 2 1 and 2 2 1 Change the vehicle s attitude from the pr
95. eak Tq and HP SAE Rating 270 ft Ibs at 3200 RPM and 210 HP at 4400 RPM 302 cubic inches and pe rform Transmission _ Ex TransS amp M 10 Pro Street Shot tm other special Transmission speed user defined specs A calculations Weight 3200 Ratio 3 08 Body amp Axle Body Style User definetNQear Wheel Drive Front Wheel Tire s User defini Rear Wheel Tire s 7 x 24 9 Str C wa Siar Nee dere or sooo soon Soto This area gives i a general Cal ulate Performance descri pt ion or APERTE summary of 1985 Ford Mustang GT 302 cid 4BBL each of the 5 270 ft Ibs 3200 210 HP 4400 m n s of specs which make up a vahicla Wheels amp Tires Enter comments to describe vehicle Click here to display Calculation Conditions weather track length etc and then calculate performance Move mouse over an area and a description of the item is given here C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions MMI Figure 2 2 Explanation of Sections of Typical Menu Name of specs Click on them for a description in the menu s help frame Help frame giving definition of spec and page in manual for more info Drop down combo box Click on down arrow button on the right side to pick from a list of possible choices for this spec Standard text entry box where you can type in the value of the spec which will be checked against acceptable limits Calculation but
96. ebird Rear No Frnt Mustang Small Block Rear No Frnt Mustang Big Block Rear No Frnt Mustang V 8 Rear Modern Pr Barracuda Big Block Rear No Frnt 5 Barracuda Small Blck Rear No Frnt S Tip Click to highlight example double click to choose example H aiddaddd a C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 3 Output provided by Performance Trends you can click on Delete to delete it Next you will be shown a comparison of the example you chose and the current specs as shown in Figure 2 38 Click on Back to return to Figure 2 37 Click on Load In These Example Specs to use these specs You will then be given a notice about how these specs can not describe all details of the example just chosen and you should still use your own judgment about the results See Figure 2 39 You have the option of changing the Example specs For example lets say you have lowered your Figure 2 38 Comparing Chosen Example with Current Specs Compare Current specs with 67 70 SB Camaro Firebird Spec Name Current Specs New Example Specs Driveline Layout Rear Wheel Drive Rear Wheel Drive fe 44 44 22 22 168 168 56 66 No Frnt Sway Bar No Frnt Sway Bar 5q ft 26 Drag Coefficient Mustang You calculate the new Frontal Area is only 18 square feet You can click on Frontal Area and Figure 2 39 Typical Notice about Component Example Notes on Example Data The Drag Racing Analyzer lets you simulate most any type of vehicle y
97. ed not converging on a solution 144 C Performance Trends Inc 1998 Drag Racing Analyzer Appendices Hm SSS a ee ay Making the tolerance close enough small will produce more exact answers but will require more calculation time Performance Trends has selected tolerance bands for iterations which give good accuracy with reasonable calculation times and allow the process to converge on a solution Because many of the equations within the Drag Racing Analyzer must be solved by iterations there is no one exact answer All calculations are an approximation Therefore do not be alarmed if an ET improvement of 002 seconds is shown for changing in Dew Point from 67 to 66 but changing from 66 to 65 showed a 004 second improvement These results are basically saying lowering the Dew Point results in a very small gain in ET Other Vehicle Simulation Programs Other vehicle simulation programs are available which do not use nearly as many inputs as the Drag Racing Analyzer uses At first you may think these other programs are smarter since they do not need this additional inputs However each input the Drag Racing Analyzer uses has an effect on performance for example Wind Direction and Wind Speed The other programs either are making an assumption that wind is some set value or assume it has no effect By letting you adjust Wind Direction and Speed the Drag Racing Analyzer shows you e The change in performance due to a change in Wind
98. ed Dial In File program expects you to run Remember to Type of weather subtract off any safety instruments you are using margin you may need for your actual Dial In to run C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 3 Output This menu is almost like a separate program because you can enter comments in the lower left corner to describe what these specs represent You can then Save these specs by clicking on File in the Menu Bar then Save or Save As Save As lets you save these specs under a new name where Save simply updates the current name with any changes By saving sets of specs you can predict Dial Ins in the future when you do not have results from a previous run Simply click on File then Open and pick a Dial In file with weather conditions or track conditions fairly similar to those you will be running Again be sure the current vehicle specs match the vehicle you are running IMPORTANT This method of using a past saved Dial In file is not nearly as accurate as using the previous run from the same track same day and same weather instruments See Section 3 3 for how to Open or Save vehicle files Saving or Opening Dial In files work much the same way There are 2 general sets of commands which let you copy sets of data from 1 run to another These are e The Edit command where you can Copy or Clear various runs e The Advance command where you move runs from right to left as you would when your Pre
99. er program as this can confuse the process 20 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions 2 3 Transmission The Transmission specs describe the clutch or torque converter and the transmission s efficiency and gear ratios Figure 2 6 Transmission Specs Menu Click here to select either clutch or torque converter to let the program estimate clutch specs or to pick an example clutch or torque converter Click here on on Pick Example button below to pick an example Transmission Specs Transmissia Use Specs Below Ciuc Force bs 1900 l paean First 1 Gear Ratio 335 Clutch Disks Second 2 Gear Ratio Clutch Material Organic rag Third 3 Gear Ratio z Fourth 4 Gear Ratio Converte Capacky Tony To Multiniicatior Si Sixth 6 Gear Ratio Lonverte Gall HPM haved on Curent Converter Capacky Ful Throttle Engine Power finvele eather Specs al the Gack e Her down arrow button to pick a type of clutch or torque converter p 19 For torque converters full power stall RPM is shown here for the current engine power curve and track weather conditions Refer to this as you adjust converter capacity or simply enter your full power Stall RPM here and the Capacity will be figured for you 21 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions Clutch Converter Type Identifies if coupling b
100. erformance Trends GT5 0L File vehicle Calc ET F2 Help Fl Preferences About ES Cale ET Match Yeh Perf Throttle Stop ehicle Specs Vehicle Summary User Defined Engine Peak Tq and HP SAE Rating 270 ft Ibs at 3200 RPM and 210 HP at 4400 RPM 302 cubic inches Clutch User Defined Specs Transmission 5 speed user defined specs Weight 3200 Asle Ratio 3 08 Body Style User defined Rear Wheel Drive Body amp Axle Front Wheel Tirefs User defined Wheels amp Tires Rear Wheel Tire s 7 x 24 9 Street Radial Launch User defined 3000 RPM Shifts 4 sec Match RPM at 5000 5000 5000 5000 RPM Click here to show Calculate Performance Calculatio n Help Comments Condition Click here to edit Vehicle 1985 Ford Mustang GT 302 cid 4BBL onginons Comments These comments are 270 ft Ibs 3200 210 HP 4400 and then saved with the Vehicle File and can be printed with reports They Calculate are handy reminders of what this Perfor vehicle represents mance Click on the Calculate Performance button and you will now be shown the Calculation Conditions screen This screen gives the conditions for calculating performance like track weather and wind the length of the run and the rollout distance For now leave these values as they are Proceed with the calculations by clicking on the Calculate Performance button in this menu Before calculations are started basic checks are
101. es Summary MALLUS ET 14441 MPH 96 01 Title or Traction Low Cli i 14 441 96 01 E l ee ey Now 00 w retrieve the Te Show History specs which A E a a E AHN these results D History Log is displayed below the columns of test results 00w N 1 1 2 2 2 2 3 3 3 3 4 Click and 7 441 000 96 01 ih move slide gt5 0l Tue Apr 21 98 3 59 pm i 14 441 071 96 01 bar to gt5 0l Tue Apr 21 98 3 58 pm j i 14 512 081 95 34 i gt5 0 Tue Apr 21 98 3 58 pm i 14 593 4 644 94 97 39 display all sg grand am Tue Apr 21 98 9 25 am 1320 h 9 949 021 134 02 37 25 tests in sg grand am Tue Apr 21 98 9 25 am 1320 z i 9 928 080 134 39 1 22 sg grand am Tue Apr 21 98 9 25 am 1320 b 10 008 327 133 17 5 14 T Click on Test Title 1st column to change it or to retrieve specs which produced those results Click in other columns for definitions Test Title Click on Test Title and you are asked if you want to retrieve the specs which produced these results Answer Yes and the specs are retrieved Answer No and you can then change the Test Title This is useful for making notes about this particular run modifications you made etc 105 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 3 Output Feet Is the distance of the race The Imprvmnts in the History is only shown if the runs were for the same distance Dnsy Alt Density Altitude in feet above sea level of the
102. esults 2 Click on the Match Veh Perf button at the top of the Main Menu to bring up the Match Vehicle Performance menu shown in Figure 2 31 3 Fill in the Match Vehicle Performance menu with the vehicle s performance Then click on OK adjust veh specs to match performance to start the process 4 The program will adjust e Engine Power Curve e Torque Converter Capacity or will switch the clutch specs to Let Program Estimate Clutch Specs if the clutch is too small for the Engine Power Curve e Tire Traction Factor e Tire Construction if it needs more traction than 110 Traction Factor can provide e Tire Growth e Tire Diameter To find a combination giving the closest match to the vehicle s performance If the program can not arrive at acceptable specs in 100 passes down the track it will give you a notice You may then want to double check your entries in the Match Veh Perf menu or some of the other specs in the other menus If the program does arrive at acceptable specs you will be shown a summary of the new specs the program found and how close the program matched performance as shown in Figure 2 32 You can then load these specs into the menus for this vehicle This process can save a good deal of cut and try on your part to get your vehicle 74 Figure 2 31 Match Veh Perf Menu E Match Yehicle Performance Your Yehicle s Actual Performance Distance of Race apen Bral RPM at Launch 60 Foot T
103. et of elevation This spec is disabled if you are using an Altimeter because the altimeter alone is measuring the air pressure Air Temperature Air Temperature deg F Air temperature in degrees F of the air at the track This spec is used for all Methods of Recording Weather Data Humidity Relative Humidity Describes the air s humidity level in percent of humidity the air could hold at its present temperature Relative Humidity can be calculated from either wet and dry bulb temperatures or from dew point and air temperature readings by clicking on the Clc button See Section 2 8 9 Dew Point deg F The dew point in degrees F of the air at the track which describes the air s humidity level The Dew Point deg F must be less than the Air Temperature Dew Point can be calculated from either wet and dry bulb temperatures or from relative humidity and air temperature readings by clicking on the Clc button See Section 2 8 8 Dew Point is a less confusing way of describing the air s moisture level than relative humidity Relative humidity readings are only meaningful if the air temperature when the reading was made is also known However the air s dew point remains constant even when the air temperature changes For example 40 degree air with a 80 relative humidity has only a 10 relative humidity when the same air is heated to 100 degrees However the dew point remains at 36 degrees for both air temperatures 51 C Performa
104. etailed info on options Vehicle Summary User Defined Engine Peak Tq and HP SAE Rating 510 ft Ibs at 5400 RPM and 550 HP at 6500 RPM 331 cubic inches Clutch Program estimates specs Transmission 6 speed user defined specs Weight 3600 Axle Ratio 3 73 Body Style User defined Rear Wheel Drive Front Wheel Tire s User defined Rear Wheel Tirefs 11 1 x 27 0 Street Radial Launch Program will limit tire spin starting at 3000 RPM Shifts 4 sec Match RPM at Computer Picked RPMs Comments 2011 Mustang 2dr Cpe Shelby GT 500 SYT 2 Door RWD 550 bhp 6500 RPM 510 lb ft 5400 RPM 17 23 mpg 4 passengers 3800 Ib Mfg Est 5 4 liter 8 cylinder Engine 6 speed Manual Transmission 3 73 Limited Slip Rear End W 7 200 Pound Driver From Road and Track Magazine Online Some specifications maybe estimated Open New Picture File Turn Picture Off Print Picture 165 C Performance Trends Inc 1998 Drag Racing Analyzer Appendices Figure A9 Including the Graphics File on Printouts ee Calculate Performance to obtain fam Drag Racing Analyze 2011 E results Then click on Print Very High Clutch Slip Engine Current ET 11 766 MPH 124 87 60ft 2 012 raction Very Low Click on Notes Last 11 766 124 87 2012 Improvement 000 00 000 EngRPM TqMult CSlip T Slip_ Thrt T ts era s Click here to make R R Cc 3 E ett zan printout If you have a picture file for printing it i is alwa
105. etween the engine and the transmission is through a friction clutch or hydrodynamic torque converter consisting of an impeller turbine and reactor or stator typical of most automatic transmission converters Click on the down arrow of this combo box for the following choices e Let Program Estimate Clutch Specs recommended for most users using clutches Use Clutch Specs Below Pick Example Clutch Use Converter Specs Below Pick Example Converter Example Example Name if you have already chosen a clutch or converter example Depending on your choice the appropriate sections buttons and inputs will be disabled grayed out and you will not be able to access them Clutch Diameter inches Identifies the outside diameter of the clutch disk measured in inches If the Clutch Diameter can not be easily measured let the program estimate it by selecting the Type called Let Program Estimate Clutch Specs Clutch Force lbs Identifies the clamping force the pressure plate exerts to squeeze the clutch disk s Manufacturers of aftermarket racing type pressure plates generally specify this force in lbs pounds of force If you do not know this force let the program estimate it by selecting the Type called Let Program Estimate Clutch Specs Clutch Disks Is the number of clutch disks which will be 1 for most all production type clutches Only special racing clutches will have more than 1 disk perhaps 2 3 or 4 disks If you do not know the
106. ew Specs button to keep these new specs Specs Which Have Been Changed Spec Name Old New Engine Pk HP 620 0 _ 704 0 Eng Pk HP RPM 6900 7130 Keep These New Specs Return to Old Specs C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 4 Examples Note The combination of specs arrived at by the Match Vehicle Performance feature are not necessarily the most accurate combination of specs to match your car The menu of Figures 4 24 and 4 25 are now gone At the Main Menu Figure 4 26 First Screen for Saving Vehicle calculated performance and you Save Changes to Same File Name confirm these specs do give results as stated by the Match Vehicle Do you want to update the current vehicle Performance screens and that do match your car just as shown in SPR STCK V6 Figure 4 25 The ET of 10 081 Q i which was not an input in the Match With the changes you ve made Vehicle Performance menu also matches quite closely to your actual ET of 10 12 Click on No to save the current vehicle specs to a new name Click on Cancel to stop saving Return to the Main Menu and click Yes in the Vehicle Comments section and change them to match these specs for your 71 Monte Carlo Figure 4 27 shows what you could type pi 4 27 Screen for Entering New Vehicle Name for Saving Drag Racing Analyzer v3 0 Performance Trends SPR STCK 6 he vehicle Calc ET F2 Help F1 Preferences About
107. ferential Both of these modifications cause problems when turning corners since now both drive tires must turn at exactly the same speed The effectiveness of the differential s lockup also depends on the type of suspension for the drive axle Click on the down arrow of this combo box to select the description which best describes your car 27 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions Notes This specification is ignored if the Driveline Layout is set to Front or All Wheel Drive or Motorcycle For Front Wheel Drive the computer assumes a high lockup due to the front wheel drive s assumed independent front suspension If the lockup is specified as 100 then the specifications Rear Track Width and Frt Roll Stfns have no effect on the results and are disabled Body Details Type Click on the down arrow of this combo box for the following choices e Use Specs Below e Pick Example Body e Example Example Name if you have already chosen a body example Driveline Layout Click on the down arrow of this combo box to tell the program where the driving wheels are or if you have a motorcycle If you specify All Wheel Drive same as 4 wheel drive be sure to select a lower Transmission Efficiency to account for extra losses in the transfer case Wt on Rear Tires Describes the vehicle s weight distribution indicating the of the vehicle s total weight which is on the rear tires This information ca
108. fter the highest RPM If you want the power to not drop so suddenly then you must add an additional RPM above your current highest RPM and enter a HP reading which draws the curve like you expect it to look Command Buttons Three of the command buttons in the Full Power Curve section are rather self explanatory e Clear will blank out all the RPM torque and HP entries e Calculate will calculate a power curve from simple inputs See Section 2 8 1 on this Calculation Menu which is the same as the Clc buttons bring up for the simpler power curve inputs in the left section e Print will print the graph and table of power curve data The other command Load from Eng Anlzr will be discussed in more detail below Load from Eng Anlzr The Drag Racing Analyzer can load engine power curves created by the proper Windows versions of Engine Analyzer EZ the standard Engine Analyzer and Engine Analyzer Pro It is recommended that both the Engine Analyzer and Drag Racing Analyzer are loaded on a hard drive C or D drive Generally you will start this process by running the Engine Analyzer program first Once the Calculated Performance results have been calculated and displayed on the screen click on the Send button in the Engine Analyzer This Engine Analyzer menu looks similar to Figure 2 5 It will ask what program do 18 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions E you want to send the power curve
109. g strip ET timer select Rollout of 0 like data logger The resolution of the time column can be increased to thousandths of a second by selecting 001 second increments in the Preferences menu 57 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions MPH Is the vehicle s velocity in MPH Accel Gs Is the vehicle s acceleration in Gs If the tires are spinning the G value is followed by an S Feet Is the distance the vehicle has traveled during the run measured in feet C RPM Is the clutch or converter output RPM See EngRPM EngRPM Is the engine RPM The difference between CRPM and EngRPM is the amount the clutch or converter is slipping Ifthe clutch is not slipping CRPM will be equal to EngRPM TqMult The amount of torque multiplication which is produced in the torque converter or clutch A value of 1 5 indicates that the output of the torque converter is 1 5 times as large as the torque which entered it If the engine can output 300 ft lbs the torque converter will increase it to 450 ft lbs See torque converter explanation in the Assumptions Appendix 1 If the vehicle is equipped with a clutch this value is 1 C Slip Is the amount of clutch or converter slip occurring in percent T Slip Is the amount of slip in the tires in percent All tires show some slip during acceleration even if they do not break loose If the tires are slipping excessively broken loose
110. h estimated tire growths given or click on the Cle button to pick from general categories of Growth 37 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions 2 6 Driving Specs The Driving Specs describe how the driver controls gear changes clutch release during the launch and power through the throttle After all specs are defined in this section below a Driving Specs Summary section follows which describes how these options work together Figure 2 13 Driving Specs Menu Selecting Computer Selecting Computer Driven launch Picks RPMs also makes makes running the program and making the program easier to run comparisons much easier Driving Specs Launch pecs Shift Specs Computer Driven No tire spin Shift Time sec 4 Typical E LaunchRPM i e 100 Power Shit Launch 2 Chitch Shift RPMs Computer Picks RPMs Launch 2 Throttle Launch Time sec 2 2 Shit APM 5000 Heip 2 3 Star Ps 5000 Click on arrow button to pick type of launch from list 3 g bude E a 3 4 Shit APM 5000 S a p 4 5 Siuh APM 5G Sih APH Launch Specs The launch getting the vehicle moving from its standing start is probably the most critical element in drag racing The Drag Racing Analyzer gives you several options for controlling engine power and clutch release during launch 38 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions E x
111. he printed report 103 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 3 Output Include Vehicle Comments Select this option if you want all the comments for the complete vehicle printed with the results Request Report Comment Select this option if you want to be asked for a comment for each particular report you send to the printer These report comments are useful to identify important points for future reference like modifications weather conditions etc See Appendix 3 and 4 for new Print features added in v3 2 and 3 4 Version 3 4 also allows you to include a graphics image photograph of your car for printing 104 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 3 Output 3 5 History Log The Drag Racing Analyzer remembers the results and the vehicle specs which produced those results for up to the last 25 runs you have made This can be a very hand comparison of one run to another and saves you the trouble of making notes on pieces of paper It is also handy to be able to go back to some condition which gave very good performance but you don t remember why or what the specs were Figure 3 10 shows the History Log and options Example 4 1 discusses the History Options in detail Figure 3 10 History Log and Options Click on History for Options Click on Test Drag Racing Analyzer v3 0 Performance Trends GT5 0L Title to Back Graph Print Analyze History Help F1 change the Not
112. he traps at So you decide to adjust that up to 5500 RPM You see Peak HP stay the same but Peak Torque and Peak Torque RPM updated to new more accurate readings If you click on Cancel you will return to the Engine Specs menu with the Power Curve specs unchanged If you click on Use Calc Value you will be returned to the Engine Specs menu with the Calculated Peak HP Peak Torque Peak HP RPM and Peak Torque RPM filled in 61 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions 2 8 1 Calc Power Curve This calculation is available from the Engine specs menu and lets you estimate a set of engine Power Curve specs Initiate this calculation by entering a Clc button for any engine Power Curve spec or the Calculate button if you are using a Full Power Curve for this menu Figure 2 21 Calc Power Curve Calc Power Curve Peak HP Peak Torque ft Ibs 75 0 Peak HP Peak Torque ft Ibs Peak Torque RPM Are the values calculate from these inputs Peak Torque RPM If you select Quarter Mile or Eighth Mile MPH Performance Specs as the Type of Calc Peak HP is calculated Type of Calc Quarter Mile MPH from a simple equation relating only vehicle weight and finish MPH to available HP Note Vehicle Weight Ibs that these Engine Power Curve specs may not Quarter Mile MPH give the same performance quarter mile or eighth mile MPH when coupled with your Engine Cubic Inches particular vehicle specifica
113. here is so much clutch slip in first gear is the Launch Type in the Driving Specs menu is set to Computer Driven Launch The computer is going full throttle on the 111 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 4 Examples Figure 4 5 Engine RPM Graph gure so one rap Click here for other options Click here to change data to be graphed Drag Raring Analyzer v3 5 Performance Trends GT5 0L Graph Data Types Help F1 Engine RPM vs Sec Back Print Options Graph Data Types Help F1 Drag Racing Analyzer v3 0 Clutch or Converter RPM vs Sec Clutch RPM less than Engine RPM clutc alia aia m N S Clutch or Converter RPM Clutch RPM J Base Clutch or matching Converter RPM Engine RPM clutch not slipping C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 4 Examples engine and feathering the clutch to prevent these street tires from breaking loose This provides for nearly the best launch with these tires but produces a lot of clutch slip and clutch wear in the real car Changing the Rear Axle Ratio Now for the good part lets change the gear ratio and see what happens Get back to the Main Menu by clicking on Back in the menu bar or pressing lt ESC gt at the graph screen Figure 4 5 then clicking on Back or pressing lt ESC gt again at the tabular Test Results screen Figure 4 3 Figure 4 7 Body amp Axle Menu for Changing Rear Axle Ratio Drag Racing Ana
114. hey are loaded with values way to build a power curve based on more taken from the SPR STCK V 6 vare palemene For inputs to this menu change Vehicle Weight from Use Calc Value 2300 for the SPR STCK V 6 to the Monte s 3200 Ibs Enter 133 1 for Quarter Mile MPH Assume your RPM 121 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 4 Examples at HP Peak occurs a few hundred RPM before your shift points for example 6900 RPM Change the V 6 s 7800 RPM to your estimate of 6900 for your Big Block Chevy The values in your calculation screen should now look like those in Figure 4 14 Click on Use Calc Figure 4 15 Engine Specs with Modifications General Engine Specs Base Engine Specs Fal Powe Curve Method of Describing Power Curve d Peak HP Only Displacement cu in To activate the Full Power Curve Peak Foraue f fis features select Specified Full Curve from pro the Method of Describing Power Curve list BPM amp Peak Torque sooo upper left corner of this screen Peak Horsepower Cid RPM Peak HP ere Corr Factor Std Dyno 29 92 60 del Click on down arrow button to pick method level of detail for describing the engine s power curve p xx Value to load all the calculated values into the Engine Specs menu The program asks if you want to use the 3200 Ibs you entered here as the actual Vehicle Weight of this car loaded in the Body amp Axle menu Since you do want to use i
115. hown in Click on Vehicle Specs buttons 1985 Ford Mustang GT 302 cid 4BBL S19 with mouse to see Vehicle specs 270 ft Ibs 3200 210 HP 4400 Figu re 1 3 Click on Calculate Performance or HP button to see performance Click on Help in menu line for more detailed info on options C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 1 Introduction The final results will appear in a table as in Figure 1 3 The columns are for various types of readings gear MPH etc which occurred at critical points in the run like the start the end of each gear beginning of each gear 60 foot time 60 MPH etc The results contain much information some which may not be familiar to you However the first three columns do look familiar If you look at the last row you see a Time of 14 54 and a MPH of 95 7 or the car ran a 14 54 ET at 95 7 MPH If you look in the upper right corner you see a Summary of the Current and Last performance including a Improvement or how much the current performance is better than the previous results You ll notice that the 94 94 MPH in this section is slightly less than the MPH at the end of the MPH column That is because a drag strip uses 2 timing lights spread over the last 66 ft of drag strip to measure top speed through the traps These lights give a slightly lower MPH than the car actually ran at exactly 1320 feet T
116. ht including driver in pounds This is initially set to the Vehicle Weight in the Body amp Axle menu but can be changed to anything you want Quarter Mile MPH Eighth Mile MPH Is the vehicle s top speed in a standing start quarter mile or eighth mile acceleration Engine Cubic Inches Is the engine s size in Cubic Inches This is initially set to the Displacement in the Engine menu but can be changed to anything you want Vol Eff Is the engine s volumetric efficiency at the HP peak Volumetric efficiency means what is the amount of air which this engine pulls in one cycle compared to how much it could under ideal conditions Generally this is less than 100 but can be up to 130 for highly tuned race engines or up to 300 on supercharged or turbocharged engines Generally this is not the engine s peak volumetric efficiency which usually occurs at the torque peak but is close to it Click on the down arrow of this combo box to select from the following choices e 65 Bad Production e 75 Typ Production e 80 Good Production 63 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions pee SE 85 HiPerf Production 90 Poor Street Strip 95 Typ Street Strip 100 Good Street Strip 110 Good Race Engine 115 Very Good Race Engine 120 Excellent Race Engine 125 Pro Stock Formula 1 90 Prod 5 PSI Boost 100 Prod 10 PSI Boost 110 Prod 15 PSI Boost 120 Prod 20 PSI Boost 95 HiPrf Prod 5 PSI Boost
117. ically start allowing you to install the Drag Racing Analyzer and demos of any of our other products If the CD does not auto run then click on Start then Run then Browse and find your CD drive Then look for SETUP EXE on the CD and run it to run the Installation Wizard If you want to bypass the wizard go into the Programs folder and run the Drag Racing Analyzer v3 4 Installer exe file Follow the instructions of the SETUP program For most users just click on OK for each Figure 1 0 Installation Wizard A Performance Trends Installation Wizard m Engine Performance Programs Install This Program View Engine Analyzer Brochure Engine Analyzer Plus Brochure Engine Analyzer Pro Brochure Engine Building Tools Install This Progam View Comp Ratio Calculator Brochure Cam Analyzer Brochure Port Flow Analyzer Brochure Swirl Meter Brochure Tumble Fixture Brochure Fuel Inj Calculator Brochure Drag Racing Tools Install This Program Drag Racing Analyzer Brochure Drag Race Analyzer Pro Brochure Brochure Brochure iol x Data Logger Programs Install This Program View Dyno DataMite Brochure Drag Race DataMite Brochure Road Race DataMite Brochure DataMite System Sp Brochure m Circle Track Rofd Race Tools Install This Program View Roll Center Calqulator Brochure Circle Track Apalyzer Brochure Suspension Amalyzer Brochure Trans Gear Galculato
118. ice that the Notes Summary is pointing out a couple of things Clutch Slip High and Low Tire Traction If you click on the Notes button you obtain the screen shown in Figure 4 4 These notes can be useful for understanding your performance however for now you are going to stick with the street tires which are probably limiting performance Figure 4 4 Notes Screen Produced by Clicking on the Notes Button Notes on Calculations The clutch was slipping for approximately 24 of the run which is high You may need higher clutch specs more torque holding capability or better tire traction Engine Power had to be limited to the tires to prevent tire spin for 25 of the run which is high and hurting performance Performance will improve by increasing Traction Factor increasing Tread Width or going to a Drag Slick Construction in the WheeljTire specs menu Click on Analyze for more details To obtain a graph of these results click on the Graph button or Graph menu item The program will present a graph similar to that shown in Figure 4 5 of Engine RPM If you do not see a graph of Engine RPM click on Data Types at the top of the graph and select Engine RPM Since the Notes pointed out high clutch slip you might want to try the Converter or Clutch and Engine RPM Graph Data Type Here you can see where clutch RPM is less than Engine RPM clutch slipping and where they match clutch not slipping See Figure 4 6 Much of the reason t
119. idity level If you require more detailed analysis or more features you may need our Drag Racing Analyzer Pro Check Appendix 3 and 4 for new features added to v3 2 and 3 4 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 1 Introduction 1 2 Before You Start What you will need e Computer capable of running Windows 98 Me XP 2000 NT Vista 7 or newer e Printer optional Many terms used by the Drag Racing Analyzer and this user s manual are similar to terms used by other publications like Converter Capacity Tire Traction Factor etc However these terms may have different definitions Therefore read Chapter 2 to see what these terms mean to the Drag Racing Analyzer Occasionally it will be necessary to identify typos in the manual known bugs and their fixes etc which were not known at the time of publication These will be identified in a file called README DOC in the Drag Racing Analyzer directory or folder A new feature also allows you to view the README DOC file in the Drag Race Analyzer by clicking on Help at the main screen then View Readme File User Manuals and Supplements describing new features can also be viewed this way Every effort has been made by Performance Trends Inc to provide you with an accurate cost saving high quality tool at a very reasonable price We do not copy protect our software to allow our customers full freedom to make back up copies for their own personal use
120. ieve the specs which produced these results a very handy method of returning to a combination which produced better results This feature was available in v3 0 156 C Performance Trends Inc 1998 Figure A3 Throttle Stop Screens i is Throttle Stop Prediction File THRTLSP Exit File Edit Options Advance Update Prediction Help 1 Previous Rur v Use Two Previous Throttle Stop Runs Use One Previous Throttle Stop Run Corr Baro Current T Stop Factor 24 368 Air Temp de Help Using 1 TS Run Dew Point deg F es cd Elevation feet 670 Wind MPH Wind Direction Side wind Side Wind M Throttle Stop T9 60 foot sec ET sec 76 Note For good accuracy Throttle Stops for 3 Run 1 and Run 2 must produce ETs that Adi Factor are at least 3 seconds different 24 368 General Specs and Comments Method of Reading Weather Data Index sec Radio TV Report with Dew Pt 7 Example of Throttle Stop inputs a T S Start Time These specs were obtained fromthe SG GRAND AM in the Vehicle Library Drag Racing Analyzer Predicted Run Air Temp deg F Dew Point deg F cid Elevation feet Wind MPH Wind Direction Side Wind x 60 Foot Time 60 ft sec Let Program Est 60 ft tir x 1 405 0 Safety Margin sec Throttle Stop 381 Ad Help Barometer reading in inches of mercury CORRECTED to sea level for elevation p 50 ia Thrott
121. ime sece TT Finish Trans Gow Tip If you are not sure of Finish Engine RPM or do not want tire diameter changed just leave it blank or setitto 0 The program will not adjust tire growth or diameter to match this RPM Help Click on down arrow button to select either Quarter or Eighth Mile run p xx Loe testart veh spees to matoh performance C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions specs adjusted Example 4 2 shows the Match Vehicle Performance process in more detail Distance of Race Select either Quarter or Eighth mile for the distance of the race you are trying to match Stall RPM at Launch Enter the converter s stall RPM during the launch Stall RPM is the highest RPM you see on the tach or data logger with the throttle wide open but the back tires not turning This occurs with the trans brake ON or before the car has had a chance to move off the Figure 2 32 Results of Match Veh Perf line Modifications Required to Match your Performance This spec is not enabled if Performance from New Specs the Transmission Specs 60 ft MPH RPM Gr indicate a clutch is being Specified used Vehicle Perf 4 Perf Obtained from New Specs ee ae A 60 foot time i Specs Which Have Been Changed The vehicle s 60 ft time from the track s timer Spec Name bes ngine Pk Tq 70 0 ngine Pk HP 66 0 ng Pk HP RPM 400 5369 a Clutch Specs ser Specs Finish
122. ind as it approaches the car on the track p xx L 123 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 4 Examples Transmission Specs Click on the Transmission button menu at the Main for the Transmission Specs menu For Clutch Converter the Type is already set to Torque Converter Use Specs Below You will see the clutch specs are disabled dimmed to gray indicating they are not used in the calculations You will notice the Converter Capacity was 385 for the V 6 and shows a 7480 RPM for the current Stall RPM This makes sense since this is was a loose converter for a higher RPM lower torque producing engine Now the converter has now been coupled with a high torque big block Stall speed would be very high You could pick an example converter or simply enter your known stall RPM of 4500 and press enter The program responds that due to rounding in the calculations the resulting Converter Capacity of 212 7 gives a Stall RPM of 4620 This is adequate for our purposes because we can t read the tachometer that accurate anyway For Torque Multiplication we change the left over 1 7 from the V 6 to a more typical 2 0 Notice how this Stall RPM is based on the current Power Curve and Track Weather Conditions which is why we entered Weather Specs before going to the Transmission Specs Click on the Transmission Type combo box and select Pick Example Transmission From the list of transmissions select the Aut
123. ing Gear most rear wheel drive rear axles Teoh Drive Gorocke e Chain Drive Only typical of go carts most motorcycles etc Yeoth Wheel Gprecke e Gear Reduction amp Chain Drive typical of motorcycles where there is l Note a chain reduction between the engine For motorcycles with a gear drive between the and the transmission and then there is engine and transmission select Gear Reduction the chain ratio between the transmission and rear axle Depending on your choice certain inputs will now be enabled amp Chain Drive as the Type Teeth Pinion Gear This is the number of teeth on the smaller pinion gear or drive gear which attaches to the driveshaft in the rear axle If you selected Gear Reduction amp Chain Drive as the Type this is the teeth on the sprocket or drive gear on the engine s crankshaft In almost all cases this number will be smaller than Teeth Ring Gear Teeth Ring Gear This is the number of teeth on the larger ring gear or driven gear which attaches to the axle shafts through the differential in the rear axle If you selected Gear Reduction amp Chain Drive as the Type this is the teeth on the sprocket or drive gear on the transmission input shaft or clutch shaft In almost all cases this number will be larger than Teeth Pinion Gear 65 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions Teeth Drive Sprocket This is th
124. ion 1 5 Example to Get You Going To start the Drag Racing Analyzer click on the Drag Racing Analyzer icon on your desktop Or click on Start then Programs then Perf Trends and then Drag Racing Analyzer After some brief introduction screens you will be left at the Main Menu shown below Figure 1 1 Main Menu Drag Racing Analyzer v3 0 Performance Trends GT5 0L File vehicle Calc ET F2 Help F1 Preferences About GT5 0L is name of Cale ET Match Yeh Perf Throttle Stop Vehicle Vehicle Spes Vehicle Summary Specs User Defined Engine Peak Tq and HP SAE Rating currently 270 ft lbs at 3200 RPM and 210 HP at 4400 RPM 302 cubic inches being x Trans BM 10 Pro Street Shot tm worked with Trsqnission 5 speed user defined specs Weight 3208 Axle Ratio 3 08 Body amp Axle Body Style Us Ndefined Rear Wheel Drive Click here Rear Wheel The sh 7524 3 Steet Radial to display Launch User defined 3000 RPM all vehicle s Shifts 4 sec Match RPM at 5000 5000 5000 5000 RPM saved in Vehicle Calculate Performance Libra ry Help Comments n T i Click on Vehicle Specs buttons 1985 Ford Mustang GT 302 cid ABB Click here with mouse to see Vehicle specs sf n i Click on Calculate Performance ZTOK ibs 3200 Z10 HR 4400 to d isplay or HP button to see performance the menu Click on Help in menu line for more detailed info on options shown in Figure 1 2
125. iously this spec has a critical impact on traction for all Tire Types Because it depends on so many variables it is difficult to estimate You can click on the Clc button to obtain a general list of estimates Most likely you will have to fine tune this estimate based on your vehicle s actual 60 ft times at a particular track You can also use the Match Vehicle Performance option from the Main Menu to have the program estimate Traction Factor Table 2 3 gives estimates of Traction Factor for different road surfaces Tires behave quite differently on dirt or sand than concrete or asphalt as assumed by the Drag Racing Analyzer Therefore it can not accurately predict acceleration performance of vehicles on dirt or sand Table 2 3 Estimate of Traction Factor Type of Tire Surface Traction Factor Dry Concrete with Traction Compound 95 105 80 95 Dry Asphalt 65 85 Wet Roads 30 50 Tire Growth The Tire Growth specs is only used for Construction type of Drag Slicks and is disabled for all other Construction types The program s definition for Tire Growth is the percent the drive tire s radius distance from center of wheel to the ground will increase at 2000 wheel RPM with no additional aerodynamic down force or lift Because this may be difficult to estimate it is again suggested you use the Match Vehicle Performance option from the Main Menu to have the program estimate Tire Growth You can also click on Examples to load in tires wit
126. kes 420 ft lbs at 4500 and 450 HP at 6000 RPM then you have no need to use a calculation menu to calculate Peak Tq and Peak HP 60 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions Example Assume you want to calculate Peak Torque and Peak Horsepower for your car but you know very little about the engine You could click on one of the Cle buttons by Peak Torque or Peak Horsepower in the Engine Specs menu You will be presented with the menu shown in Figure 2 20 Vehicle Weight Engine Cubic Inches and RPM at HP Peak are already available from other menus in the program and these values are already loaded into the Calculation Menu Vehicle Weight and Cubic Inches are accurate for your engine and vehicle so you leave them as is However RPM at HP Peak you are not sure of and you may change this Note that all inputs are disabled except Type of Calc Select the Type of Calc from this Combo box Since you do know your quarter mile MPH select Quarter Mile MPH All specs except Vol Eff are now enabled printed in black not gray All you have to do is enter your Quarter Mile MPH of 121 and press lt Enter gt You now see the calculated Peak HP Peak Torque and Peak Torque RPM at the top of the menu You would be ready to Use Calc Values if the RPM at Peak HP was correct From reading in this section you see that a good estimate of RPM at Peak HP is about 500 RPM less than the RPM you shift at or go through t
127. l to keep records of information like this what your actual barometer reads versus what this simple calculation says it should approximately read to see if the comparison is constantly jumping around If you always make the check at the same place same elevation like your home or shop and the difference is varying high by 1 than low by 2 etc you may want to have the barometer or altimeter checked out e Ifyou find that you are making many adjustments to your weather station you are probably doing something wrong A barometer or altimeter which reads low but consistently reads low is better for predicting throttle stop or dial in trends than one you are trying to keep accurate by constantly adjusting it e Unless you are racing in very different air at least 1000 ft different in dry density altitude you are probably better off not changing jets Unless you know if you were on the rich side or lean side to start with you may actually be making things worse Also constant carb adjustments are just one more thing to go wrong and cause inconsistency 52 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions Wind Specs Wind Speed MPH Corner Tail Wind Side Wind Corner Head Wind The wind speed in MPH Wind N S speed has a significant effect on ET and accurate measurements are difficult to come by You may want to invest in a hand help s lt a anemometer or vane wind speed Tail Wind Vehicle Dire
128. l to return to the Calculate Performance Conditions menu with no change to Dew Point Section 2 8 Calculation Menus explains all these calculations Once you feel comfortable changing specifications in the various menus and making various performance calculations read Section 3 3 of this manual called Vehicle Library to learn how to save a set of vehicle specifications or recall information which has been previously saved Then you will know all the basic commands to operate the program For a more in depth knowledge of using these commands and an explanation of the results read this entire manual C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 1 Introduction 10 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions Chapter 2 Definitions 2 0 Basic Program Operation Figure 2 1 shows the Drag Racing Analyzer s Main Menu with explanations of your options here Figure 2 2 shows the Body amp Axle menu with explanations of options for most component menus Figure 2 1 Main Menu Options Buttons to display individual menus containing vehicle and driving specs Menu bar Click here for drop down menus of program options some being the same as the Command Buttons Name of current vehicle file Command Drag Racing Analyzer v3 Performance Trends GT5 Si buttons to save File ve Ae vehicle file calculate performance Vehicle Specs Vehicle Summary User Defined Engine P
129. le Stop Prediction File THRTLSP Exit File Edit Options Advance Update Prediction Help Previous Run Run 1 For Run 1 Air Temp deg F enter the Dew Point deg F Faeroe Elevation feet from a previous ind MPH set of runs Wind Direction Adiust Factor Throttle Stop 60 foot sec Corr Baro Hg ET sec Note Click on Options then Help for info on using only 1 Throttle Stop run General Specs and Comments Method of Reading Weather Data Index sec Radio Tv Report with Dew Pt x Example of Throttle Stop inputs TS Start Time These specs were obtained fromthe J SG GRAND AM in the Vehicle Library w Predicted Run Air Temp deg F Dew Point deg F Elevation feet ind MPH Wind Direction Side Wind gt 60 Foot Time 60 ft sec fet Program Est 60 ft tir 7 Safety Margin sec Throttle Stop cid Help Barometer reading in inches of mercury CORRECTED to sea level for elevation p 50 Appendices This screen is as described in manual basing throttle stop on 2 previous runs Select Use Two old method or Use One T S For Use One you must have an Adj Factor from a previous set of runs See test for how to use each method Adj Factor and Safety Margin added in V 3 2 New screen for using One T S with an Adj Factor from a previous set of runs Enter the Adj Factor fro
130. length e How you stage your vehicle with respect to the staging lights Figure 2 18 Calculate Performance Menu This combo box lets you select the combination of weather instruments you will use including an altimeter Calculate Performance Conditions Wind Specs weit Speed MPH Corr Barometer Hg Track Specs Air Temperature deg F Track Length ft 1320 Quarter Mile Dow For aes e a Elevation feet ioe e Help Click on arrow to select how you want to enter weather info and the type of instruments you will L 49 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions Track Weather The weather conditions affect both the air s oxygen density which affects engine power and the air s total density which affects aerodynamic drag Many drag racers use their own personal weather stations In these cases be sure you read the Notes on Weather Conditions at the end of this section page 52 Method of Recording Weather Data Click on the down arrow button of this combo box to be presented with this list of options e Radio TV Report with Rel Hum Radio TV Report with Dew Pt Uncorr Baro with Rel Hum Uncorr Baro with Dew Pt Altimeter with Rel Hum Altimeter with Dew Pt If you change the Method the 4 inputs specs in the Weather section are changed or enabled disabled as necessary to represent the new Method In addition all
131. let the program better estimate the engine s rotating inertia Definition of Engine Inertia The engine inertia is a measure of how massive the engine s rotating components are and how difficult it is to accelerate or decelerate the engine itself Most of the engine s inertia is contained in the flywheel clutch assembly for a manual transmission or in the torque converter for an automatic transmission The more massive or the larger the diameter the flywheel or any rotating engine component the larger the inertia value Peak Torque ft Ibs This is the maximum torque value for the vehicle s engine This information is listed in magazine articles owner s manual repair manual or from dynamometer tests See Appendix 2 If this value is not known one of Performance Trends Engine Analyzer programs will help you measure or estimate the engine s maximum torque If you have no information on Peak Torque we recommend you select one of the example curves select the Method of Describing Power Curve of Peak HP Only to eliminate this spec or click on the Cle button to calculate Peak Torque from other inputs 16 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions RPM at Peak Torque This is the RPM at which the peak torque occurs This is listed in magazine articles in the owners repair manuals or dynamometer tests with the peak torque value for example 265 ft lbs 2800 RPM The RPM at Peak Torque must be lower th
132. lets you turn the demo into a working version with a code Shifts 2 set Powe aC COMputer PERET Hem Exit Program Click here to set default floppy drive letter A or B by 3 2 Performance Trends 10SEC FW_D sip References Reg To Kevin Gertgen Click on Allow Instant Updating of Changes for feature described 01 Sec Increments runs faster on next page v 001 Sec Increments more exact RA T Help Preferences Reg To Kevin Gertgen Siriaas Help On Main Screen Remind On Tire Wt Change Introduction to Basic Windows Commands Don t Remind on Tire Wt Change About Drag Racing Analyzer Default Floppy Drive currently A s Engine Graph Thick Lines Display the User s Manual with v3 2 Supplement Engine Graph Thin Lines Display User s Manual Supplement v3 2 changes only Allow Instant Updating of Changes Display the the Readme doc file recent changes Don t Allow Instant Updating of Changes ther Performance Trends Products Remove Old Example Vehicles from Your Vehicles gt Jeng erformance Trends on the Web Shifts 2 sec Power Shift at Compyfer Picked RF If updating from v3 0 click here to remove old example vehicle files from Your Saved Vehicles folder New Examples with same specs are in Examples folder Options to display the user s manual or the Readme doc file listing recent changes Click here to visit the Performance Trends website to read about or download dem
133. ll need 2 Previous or Figure 4 33 Throttle Stop Accuracy Notice eee and must be obtained with 2 very different throttle stop settings The The Throttle Stop feature s accuracy depends on throttle stop settings must produce at how close the current SG GRAND AM vehicle s least a 3 second difference in ET specs match the vehicle you are figuring a Throttle Stop for The throttle stop setting is usually the Do the current SG GRAND AM specs match this time the stop is On or has the throttles vehicle closed you set on the throttle stop timer This usually has the finest control and best repeatability Figure 4 34 Throttle Stop Menu Click on File and then New to blank out all entries Select the Throttle Stop Prediction File gg Method of Exit File Edit Advance Update Prediction Hep i Reading Weather Previous Run Predicted Run a Run 1 Run 2 Data which Bbs Baro Bg ee best Rel Hum oe your Elevation feet a E Elevation feet instrument Cc L Wind Direction Caim No Wind Caino wind Wind Direction Enerya Throttle Stop y Estimate Zhange in 60 Foot Time desired BOfootsee id enesest E ET Index ET sec AL CS Sh tok see rany Note Throttle Stops for Run 1 and Run must produce ETs Throttle Stop 7 safet that are at least 3 seconds different hrottle Stop y General Specs and Comments Help Enter the Method of Reading WeatherData Index
134. locity at the end of the run in miles per hour If you have selected 1320 Quarter Mile as the Track Length the MPH will be the average velocity for the last 66 ft of the run This MPH closely simulates standard drag strip MPH which is based on the time it takes the vehicle to break a light beam 66 ft before the finish line and the finish light beam at 1320 ft You will notice that this MPH is somewhat less than the MPH reported at 1320 ft in the tabular results For any other distance MPH is the vehicle s speed exactly as it crosses the finish line Improvement Improvement is simply the difference between the Current Run and the Last Run for which performance was calculated If the improvement is a positive value e The Current Run s ET was quicker shorter than the Last Run s e The Current Run s MPH was faster greater than the Last Run s 56 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions Tabular Results The tabular results gives important vehicle and engine information at significant points during the run e At the start of the run When the Rollout distance has been traveled when the staged light is uncovered At the beginning and end of each shift At 60 330 660 and 1000 ft Some tracks also give times for these distances At 60 and 100 MPH Occasionally two of these conditions may occur very close together For example 60 MPH may occur a couple hundredths of a second before th
135. locked differentials where the driveshaft is exposed is to jack one of the rear tires off the ground leaving the other rear tire on the ground Mark a spot on the driveshaft Rotate the tire which is off the ground exactly 2 complete revolutions The other tire must remain still which it will if you do not have a locked differential Count the number of revolutions the driveshaft turns This indicates the final drive ratio For example if the driveshaft turns 3 5 times the final drive ratio is 3 5 If you have a locked differential the procedure is the same except you must have both rear wheels off the ground and you rotate the tire only 1 turn not 2 Safety Precaution This procedure should be attempted only by experienced mechanics taking the proper safety precautions This procedure may not be possible for racing axles with locking differentials or spools Diff Lock Eff The final drive differential in either a front wheel drive s transaxle or rear wheel drive s rear axle can be either a locking type posi traction traction lock etc or an open differential with no locking The locking type of differential tries to put the most power to the drive tire with the most traction Production locking differentials do not do this perfectly but some racing differentials do lock up completely Perfect lockup 100 lockup can also be accomplished by welding the differential gears solid or by installing a spool to replace the dif
136. lyzer v3 0 Performance Trends GT5 0L File veh more di icle CalcET F2 Help F1 Preferences About Body Axle Specs Vehile Weight Vehicle Weight Ibs se Specs Below Axle Specs Final Drive Ratio Diff Lock Eff 50 Prod Posi M Help Ratio of the final drive gears or chain ratio For Rear Wheel Drive cars this is the Rear Axle Ratio Click on Cle button to calculate from of gear teeth p29 Driveline Layout Rear Wheel Drive Wt on Rear Tires Height of C G in Wheelbase in Rear Track Width in Fit Roll Stfns Modem Production eid Frontal Area sq ft Drag Coefficient MEID enU e Tu letailed info on options Click on Final Drive Ratio rear axle ratio for rear wheel drive cars and change it to 2 0 Then recalculate perfor mance Repeat this sequence trying several different axle ratios Click on Body amp Axle to bring up the menu shown in Figure 4 7 Because you can make many modifications on the computer easily it is not necessary to install only 1 different axle ratio In fact you learn more by installing several ratios with only small changes so you can clearly see trends Lets arbitrarily choose axle ratios starting at a point we believe will definitely hurt performance and increment through what we believe will be the best ratio For example we could start at 2 0 and
137. m a previous set of Calibration runs where you made a large change in the throttle stop setting Now a Predicted Run s throttle stop setting is just based on Run 2 s results and this Adj Factor 157 C Performance Trends Inc 1998 Drag Racing Analyzer Appendices New Throttle Stop Options In Version 3 2 there are 2 ways to predict Throttle Stops 1 Based on 2 previous runs obtained during time trials or test and tune runs This is the only method that was available in version 3 0 is somewhat more accurate but much less convenient 2 Based on 1 run and the Adjustment Factor determined from some set of 2 runs you ran some previous time This method has been added in Version 3 2 and is much more convenient Click on Options at the top of the Throttle Stop screen and then select which method you want to use To determine the correct Adjustment Factor for one run you must first open a throttle stop file you have run in the past which has 2 runs Then click on the Clc button by the Predicted Throttle Stop setting or click on Update Prediction When there is a Predicted Throttle Stop displayed you will also notice an Adj Factor or Adjustment Factor displayed under Run 2 Now you can click on Options and choose Use One Previous Throttle Stop Run The screen will change and the Adj Factor will be loaded in You could also simply type in a adjustment factor from a previous set of runs Als
138. mmand Click on Advance to Dial In Prediction File DIALIN move Predicted Exit File Edit Advanee Update Prediction Help weather conditions Previous Run Predicted Run to Previous Run Air Temp degF e1 _ s Air Temp deg F 3 Predicted Run is Rel Hum 66 Cle RelHum blanked out Estimate Change in 60 Foot Time GO foot see e Program Estimare 60 time 2 ET sec 84 foor sec Dial In Sec n ET and 60 foot o e __ end blanked out for General Specs and Comments Help you to enter Method of Reading Weather Data Observed barometer reading in inches of your actual 3 mercury as read directly off a barometer Uncort Baro with Rel Hum B instrument not corrected to sea level for numbers Cd 136 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 4 Examples Clc button by Dial In or the Update Prediction command The new predicted Dial In is 10 265 as shown in Figure 4 32 This is how you will proceed advancing the Predicted Run s weather and actual ET and 60 foot time to the Previous Run and coming up with new Dial Ins through the rounds Figure 4 32 Dial In Menu Predicting Dial In for the Next Round Fill in your Dial In Prediction File MALIN g actual 60 ft Exit File Edit Advance Update Predictioh Help time andET Previous Run Predic 64 Run l Fill in the Obs Baro Hg
139. mp Tire Specs menu and allows you to estimate See either a front or rear wheel s Tire Diameter Inputs and Tread Width for certain Tire Rating p Types Rating Type P Metric ex P225 60 15 Note For all Rating Types except Rolling ote lime abe oxic z25__ Radius the Calc Tire Diameter is approximately 3 less than what you would calculate based on the exact dimensions This is to allow for some tire wear deformation and slip Holing Radius in Hecwupieiorce H Rating Type Note Calculated diameters are reduced approximately Click on this combo box for the following 3 from exact dimensions to allow for some wear deformation and slip rating types e P Metric ex P225 60 15 Letter ex G 60 15 lise Calc Value Het Rolling Radius inches _ Help Circumference inches Depending on your choice certain specs will become enabled If you choose the P Metric or Letter Type you will also be able to calculate the Tread Width 68 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions Metric Tire Size ex 225 Identifies the tire s cross sectional width in millimeters and is also related to the tire s load carrying capacity Letter Tire Size Identifies the tire s load carrying capacity Click on this combo box to select on of the letters This is an older rating system and there is more variation across manufacturer s Aspect Ratio Is the ratio of
140. mp deg E is3 pressure and an elevation correction is not needed fen Pads se Enter your barometer reading of 29 46 and the dry Dry Bulb Temp deg F bulb reading of 83 for Air Temp For Rel Humidity Wet Bulb Temp deg F click on the Cle button Select No for Know Dew Point and Wet and Dry Bulb inputs become enabled Dry Bulb already filled in with the 83 degree Air ES ane Temperature Type in 73 degrees and press lt Enter gt to obtain the calculated 62 Relative Humidity Click on Use Calc Value to load 62 back into the Calculate Performance Conditions menu Next select Headwind as the Direction for Wind Specs which enables Wind Speed where you enter the Wind Speed of 5 MPH For Rollout leave the SPR STCK V 6 s selection of 10 medium because you are not sure what your rollout is Rollout is not critical if you just want to predict performance changes The Calculate Performance Conditions menu should now look like Figure 4 17 Click on Return to return to the Main Menu Figure 4 17 Calculate Performance Conditions Calculate Performance Conditions Track Weather l Wind Specs Method of Reading Weather Data Wind Speed MPH 5 o ind Direction REEMA Obs Barometer Hg Track Specs Air Temperature degF Track Length ft 1320 Quarter Mile Relative Humidity 62 0 Rollout 10 medium l Rievation fogi jo l Help Click on down arrow button to pick the direction of the w
141. mponent screens Did fine tuning of Tire Diameter and Tire Tread Width calculations to better match the new modern P Metric tires with very tall and wide wheels New Preference lets you select to do new Fine Tuned method for calculations for P metric tire sizes on not Program now better finds Engine Analyzer programs to link up with Added some more example transmissions Fixed a minor bug where a file size would never shrink if you changed to a smaller size JPG pic file Added many new example vehicle files with pictures Screen for saving files now has much larger field for entering long names C Performance Trends Inc 1998 Drag Racing Analyzer Appendices Figure A8 Including a Graphics File with the Vehicle File iA Drag Racing Analyze 2011 Ford Mustang 2dr Cpe Shelby GT 500 Eile vehicle Calc ET Help Preferences Reg To Kevin Gertgen DoR Open Vehicle Library Calculate ET Performance Dial In Save Vehicle to Library Vehicle Specs Transmission Body amp Axle Wheels amp Tires Driving Calculate Performance Help Move mouse over item for description to be given here Click on Help in menu line for more detailed info on options Match Vehicle Performance Throttle Stop Vehicle Summary User Defined Engine Peak Tq and HP SAE Rating 510 ft lbs at 5400 RPM and 550 HP at 6500 RPM 331 cubic inches Clutch Program estimates specs Transmission 6 speed user
142. n be found in magazine road tests or owner s repair manuals An example would be weight distribution 55 45 which indicates 55 of the vehicle s weight is on the front tires when the vehicle is stationary and 45 is on the rear tires It is also possible to measure the vehicle s weight distribution by weighing the vehicle with all 4 tires on the scale and then weighing it with only the rear tires on the scale Both weighings should be done with the driver and with the vehicle level Then use the formula Formula to Calculate Wt on Rear Tires 28 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions Wt on Rear Tires Wt for Rear Tires Only _x 100 Total Vehicle Weight For example if the total vehicle weight is 4000 lbs and the rear tire weight is 1800 the Weight on Rear Tires is 1800 4000 x 100 45 Since Wt on Rear Tires has a Clc button this calculation is computerized as shown in Section 2 8 3 Height of CG Describes the height of the Figure 2 8 Estimate of Height of CG vehicle s center of gravity from level ground A sports car will have a lower Estimated CG than a 4WD truck Height Increasing the height of the 5 inches CG installing a lift kit will improve weight transfer and therefore traction in a rear wheel drive car for improved acceleration capabilities Height of Front C Safety Precaution of Crankshaft Transferring this weight to the rear means less weight is being
143. n the Open button or Click on File and then Open and open this file For your own vehicle follow the procedure in Example 4 2 to match the Drag Racing Analyzer to your vehicle specs for some good running day When the Drag Racing Analyzer s predicted results match your vehicle s results save these specs to the Vehicle Library Use a new vehicle name like 133 10 12 which could be for the your vehicle running 133 1 MPH in 10 12 seconds Note 001 Sec Increments Since we will be looking for very minor ET changes we should select the 001 Sec Increments in the Preferences menu This will have the program calculate all time results to the nearest thousandth of a second This was done in Example 4 2 Calculate performance for the file EXAMPLE4 2 file and you obtain 10 081 133 25 MPH Open Up Dial In Menu Once you have developed a set of vehicle specs which represent your car click on the Dial In button at the top of the Main Menu These vehicle specs do not have to produce your ET and MPH exactly but should be within a couple of MPH and a couple of tenths of the ET You are first given a notice to this 132 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 4 Examples effect as shown in Figure 4 28 Click on Yes and you will see a screen Figure 4 28 Dial In Accuracy Notice similar to that shown in Figure 4 29 Di First since you are starting a new The Dial In feature s accuracy depends on how sequence of runs at a
144. nal inertia than removing 1 pound from an axle shaft 150 C Performance Trends Inc 1998 Drag Racing Analyzer Appendices pa a ary Example Try some examples with the Drag Racing Analyzer with the GT5 0L The GT5 0L s Baseline performance is a 14 593 ET Now remove 40 Ibs from the front wheels by setting Front Wheels Tires WT 10 instead of 50 This modification simulates moving 40 lbs from the front wheels and placing it somewhere on the body since we did not also reduce Vehicle Weight 40 lbs If you have the Preference Warn on Tire Weight Change selected the program will ask you if you want to change the vehicle weight by 80 Ibs when you leave the Wheels Tires menu Answer No for now Calculate performance an we get an ET of 14 512 Nearly a one tenth improvement just by moving weight around on the vehicle not moving it to change traction Now reduce the Vehicle Weight 80 Ibs to 3120 This simulates removing 40 Ibs from each front wheel amp tire and not placing it on the vehicle This GTS OL s ET is now down to 14 441 Analyzer Modification Baseline No change to GTS OL 14 593 94 97 and place the weight on the body vehicle weight lightens up 80 Ibs Vehicle Weight 3120 To be exact about removing 40 lbs from each front wheel tire the GT5 0L s Wt on Rear Tires would have increased to 41 from the GT5 0L s original 40 Weight on the Rear Engine Inertia Engine inertia is more complicated than other ro
145. nalyzer as many times as you want If an Engine Analyzer program is not z currently running and talking to the Figure 2 5 Menu to Start Up an Engine Drag Racing Analyzer you can also start Analyzer Program the process by clicking on the Load from Switch to Enaine Proaram Eng Anlzr button You will get the screen of Figure 2 5 l Windows Engine Program Engine Analyzer EZ Look Fox i Engine Analyzer v2 51 Look For It Engine Analyzer v3 Look For i Engine Analyzer Pro Look far i Troubleshooting If this process of loading power curves into the Drag Racing Analyzer from the Engine Analyzer does not work like Program EXE Nome described above consider the following TEA ay e You do not own the correct Windows version of Engine Program icon Name fs Analyzer program e You have renamed the Drag OK Switch Other custom configuration i eek fe 2 Racing Analyzer or Engine Analyzer executable EXE file 19 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions L E _ _ E E Eee SS SS The Drag Racing Analyzer should be DRA EXE e Inthe Engine Analyzer program click on the Look for It button by the Drag Racing Analyzer option to see if the program can find a correct Windows version e You are trying to help the programs transfer control to each other Do not minimize one of the programs then activate the oth
146. nce Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions Elevation Elevation ft The elevation of the track above sea level in feet This spec is only used if you are using a Corrected Barometer like from a TV or radio station weather report If the elevation is below sea level enter a negative feet for this reading Altimeter The altitude in feet above sea level from an altimeter instrument The program assumes the altimeter is corrected to 29 92 This means on a standard 29 92 barometric pressure 60 deg day the altimeter would read 0 feet at sea level If the altimeter is reading feet below sea level enter a negative feet for this reading Notes on Weather Readings and Weather Stations Many racers will use weather stations a collection of temperature humidity and barometric pressure measuring devices When using these instruments here are some things to keep in mind e Unless you are very close to sea level an actual observed or uncorrected barometer will usually read less than a TV or radio weather report barometer For elevations less than 5000 feet an uncorrected barometer should read approximately 0 1 Mercury less for each 100 feet of elevation above sea level For example if your barometer instrument is at 850 feet elevation and the closest weather station reports 30 46 barometric pressure your barometer should read approximately 85 850 100 x 1 less or 30 46 85 29 61 It is usefu
147. nce Trends Inc 1998 Drag Racing Analyzer Chapter 4 Examples Figure 4 20 Body amp Axle Menu l Vehile Weight Body Details Vehicle Weight Ibs Type Use Specs Below Driveline Layout Rear Wheel Drive Axle Specs Final Drive Ratio 4 56 er WtonRearTires 43 8 cid Height ofC6in 2 Diff Lock Eff 100 Spool l M Help Rear Track Width in The area of the vehicle s silhouette when viewed Frt Roll Stfns No Frnt Sway Bar from the front in square feet usually 20 25 ft Click on Cle button to calculate from simple Frontal Area sq ft dimensions p 29 SS P Drag Coefficient Also type in your measured Wheelbase of 105 instead of the example s spec of 108 and measured Rear Track Width of 50 versus the examples 60 The Monte s rear axle is narrowed to accommodate the 14 slicks In the process of changing these specs from the Examples the program will warn you that the specs will no longer accurately represent the example and the name will be changed to Use Specs Below Select the Yes answer to the question Change these specs anyway The Body amp Axle menu should now look like Figure 4 20 Wheels amp Tires For Front Wheel Tire specs you weigh a wheel and tire and come up with 20 lbs The diameter you measure at about 22 You keep the Front Wheel Tire Type of Use Specs Below and enter these measurements Actually Front Wheel Tire s
148. nds You may want to build in your own safety factor one which may change depending on the situation Say if you feel confident of a win novice opponent you may want to enter 9 92 for a 20 thousandths second safety margin be sure you don t break out We recommend you always use some safety margin at least 005 seconds T S Start Time In this version this time is only used to ensure the 60 foot times are not being affected by the throttle stop If the program thinks the throttle stop is On before the 60 foot time 60 foot times are not used in the prediction Throttle Stop Predicted Run This is the program s prediction of your throttle stop setting to run the Index ET If this is blank click on the Clc button by it or Update Prediction in the menu bar at the top of the menu The Throttle Stop is not saved because its value will change depending on what the other vehicle specs in the program are set to Check Appendix 3 for new Throttle Stop options added to v3 2 81 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 3 Output 2 11 Dial In Prediction The Dial In Prediction menu will let you predict the ET of a future run based on a past run and the weather conditions of the past run and the future run This is very useful for predicting Dial In for bracket racing Click on the Dial In button at the top of the Main Menu and you are presented with the menu shown in Figure 2 34 This menu will let you predict
149. new race click on close the current 71 MONTE vehicle s specs File and then New This will blank out Q match the vehicle you are figuring a Dial In for all the entries F Do the current 71 MONTE specs match this vehicle Figure 4 29 Dial In Menu Click on File and then New to blank out all entries Ss Dial In Prediction File DIALIN Exit Fife Edit Advance Update Prediction Help Previous Run Predicted Run Corr Baro Hg Corr Baro Hg E Air Temp deg F i P Renum JT ethod o Elevation feet j E Data Wind MPH ind which best Wind Direction c Wind Direction Calm No Wind matches your Estimate Change in 60 Foot Time instrument z package 60 foot sec Let Program Estimate 60 ft time 5G teat sec Help Barometer reading in inches of mercury CORRECTED to sea level for elevation px C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 4 Examples Next obtain current weather conditions for the drag strip For this example we are using a commercial Weather Station package e A barometer instrument which reads our actual observed barometric pressure from 28 to 32 Hg e A dial thermometer for air temperature e A dial hygrometer which reads out in Relative Humidity e Wind speed and direction you obtain from a hand held wind speed meter and compass The Method of Reading Weather Data of Uncorr Baro and Rel Hum exactly matches your instr
150. ng your ET you must change your throttle stop setting to run a specified ET Like a Dial In you will record weather conditions and ET for a previous run in this case 2 runs and input weather conditions for a future run to Predict Instead of telling you the ET the car will run for this Predicted Run the program tells you how to set your throttle stop to run your desired ET Matching Your Vehicle s Performance The first step is to get the computer results to match your actual drag strip results See Example 4 2 for this For this example we will use the Super Gas Grand Am vehicle SG GRAND AM Open this file from the Vehicle Library This car runs about 9 68 ETs with no throttle stop The throttle stop is used to slow it down to running the 9 90 index of the NHRA Super Gas class Open Up Dial In Menu Once you have developed a set of vehicle specs which represent your car click on the Throttle Stop button at the top of the Main Menu These vehicle specs do not have to produce your ET and MPH exactly but should be within a couple of MPH and a couple of tenths of the ET You are first given a notice to this effect as shown in Figure 4 33 Click on Yes and you will see a screen similar to that shown in Figure 4 34 First since you are starting a new sequence of runs at a new race click on File and then New This will blank out all the entries 138 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 4 Examples Next you wi
151. nsmissions body styles etc preloaded for you to pick from e Several ways to input engine power from just peak HP all the way up to a full power curve of 10 RPMs You can also generate power curves from other simple inputs your car s actual specs and performance MPH or in a Windows Engine Analyzer and import it directly e The Match Vehicle Performance option where you enter your car s actual stall RPM 60 ft time MPH finish RPM etc and the program adjusts critical specs to match your actual performance e You can have the program automatically pick near optimum shift points e Customize the method of entering weather conditions in up to 6 different ways including altimeter corrected or uncorrected barometer relative humidity or dew point Also accepts wet dry bulb temps e After you ve calculated performance the Analysis Report will make notes about the run and suggestions for improving performance e Converter stall RPM is automatically displayed as converter specs are changed e Onscreen help by simply clicking on any input spec e Graphs of Engine RPM Acceleration Rate in Gs Distance MPH available HP etc to compare current results with a baseline run you can choose e Special Dial In and Throttle Stop prediction screens with separate Save Open and Print features e A History log of the last 25 runs is kept to track your modifications e Calculation of Density Altitude and Dry Density Altitude correcting for hum
152. nverters generally have more slip at high speed possibly lowering your quarter mile MPH Note You may wonder why you can t just use the converter s stall RPM instead of Capacity The fact is a converter does not have a single stall RPM but a different stall RPM for various amounts of engine torque For example when an engine is idling against a stalled torque converter the stall RPM is the idle RPM Open the throttle slightly and produce more torque and the stall RPM increases How stall RPM changes with various amounts of engine torque is defined by Converter Capacity Only by using Converter Capacity can you accurately see how stall RPM and vehicle performance changes with changes in engine output torque Engine torque can be affected by many things including weather throttle engine modifications etc 23 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions Conv Tq Multiplication Describes the amount of torque multiplication produced by the torque converter at stall when the drive tires are not turning A torque converter increases engine torque at stall similar to a gear box As the vehicle starts to move and converter output RPM increases torque multiplication drops At higher converter output RPMs torque multiplication eventually reaches 1 1 no torque multiplication but no torque loss The Conv Tq Multiplication spec is generally not available from converter manufacturers but it should be
153. ny efficiency even though the label does not match your car For example say you are working with a Ford C6 rated at 88 60s Hvy Dty 3 spd Auto You have made some improvements like going to a lighter fluid Simply select an efficiency which is 1 to 2 higher than what you currently have Efficiency set at even though 89 is called 89 60s AWD 3 amp 4 spd Auto The Efficiency of 89 is still slightly better than 88 even though you do not have All Wheel Drive 24 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions First 1 Gear Ratio Second 2 Gear Ratio Third 3 Gear Ratio Fourth 4 Gear Ratio Fifth 5 Gear Ratio Sixth 6 Gear Ratio Are the gear ratios in the transmission If you do not know your transmission s gear ratios select one of the examples Even though your transmission is not listed select one with the same number of gears This will be closer than guessing 25 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions 2 4 Body amp Axle The Body amp Axle specs describe the vehicle size weight suspension final drive system and aerodynamics Figure 2 7 Body amp Axle Specs Menu Vehicle Weight and Final Drive Ratio rear axle ratio are very critical for accurate predictions Select to pick an Example of Body Details Specs or select Use Specs Below and enter in your own specs BodyiAxle Specs Vehile Weight Vehicle Weight s
154. o Turbo Hydra Matic 400 Either double click on it to select it in one stroke or click on it to highlight it then click on the Pick button You will next be presented with a Figure 4 18 Picking the Example Turbo Hydra Matic 400 Transmission Example Transmissions Efficiency Gearl GearZ Gear3 Geard GearS Gear6 He o 4uto Race PowerGlide Auto Production PowerGlide 4uto Turbo Hydromatic 350 4uto Turbo Hydromatic 400 2 Auto GM 4L80 E 90s 4Auto Turbo Hydromatic 700R4 Typ Auto Turbo Hydromatic ZOOR4 Typ Auto Mopar Torqueflite 60s Typ Auto Ford C4 Typ 30 Auto Ford C6 60s Hyy 4uto 87 Mustang AOD Good 30 Manl 8 Mustang TS Typical Manl 8 Camaro 5 0L 5 Spd M39 Typical Manl 95 Corvette Camaro 6 Spd Typical Manl Ford Toploader 3 Spd V8 Typical Tip Click to highlight example double click to choose example E O O E O O NNONNNNN ONI errerrrrrr rrr rrr erererrrrrrrrhrr rro coco co oo ooo oc oo 6 5 6 N screen comparing the SPR STCK V 6 s Powerglide transmission specs to the TH400 s Click on this screen s Load these Example Specs button Then you will see a general description of the example transmission specs and then you will be returned to the Transmission Specs menu with the TH400 s specs loaded in The Transmission Specs menu will now look like Figure 4 19 124 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 4 Examples Figure 4 19 Transmission Specs Menu Transmission Spec
155. o enter the weather TS setting ET and 60 ft for just one previous run Run 2 Now the program is ready to predict a new Throttle Stop setting from new weather conditions you enter for Predicted Run Click on the Clc button by the Throttle Stop output or the Update Calculation menu item for the Throttle Stop setting you should run For example you have obtained an Adj Factor of 25 234 based on 2 previous runs perhaps 2 months ago You come to a new event and make a time trial pass with certain weather conditions throttle stop setting and ET This first time trial should be your attempt to run very close to the Index You enter these conditions into the program as Run 2 Now for your Round 1 run you enter the current weather conditions Safety Margin and method to estimate the 60 ft time for the Predicted Run and click on the Cle button to obtain the correct Throttle Stop setting This Throttle Stop setting will be nearly as accurate as if you had made 2 runs with very different throttle stop settings as described in the manual in Example 4 3 You will also notice a new input called Safety Margin For example if you say your index is 9 90 but you want the program to predict what setting is necessary to run a 9 93 a 03 second safety margin you should enter 9 90 as the Index and 03 as the Safety Margin Safety Margin is also available in the Dial In screen and works in a similar way What is Adj Factor The
156. o graph which is also available at the Options menu Drag Racing Analyzer v3 0 Performance Trends GT5 0L int Options Graph Data Types Help F1 Drag Racing Analyzer v3 0 Engi Menu item brings up on screen help Engine RPM data type shown with Baseline Graph Title can be changed in Options menu Graph Labels can be changed in Options menu A typical graph is shown above with some explanation of features The next pages show the Graph Options window and discusses these options 95 C Performance Trends Inc 1998 Figure 3 6 Graph Options Menu Drag Racing Analyzer Chapter 3 Output Drag Racing Analyzer v3 0 Performance Trends GT5 0L Me Options for Making Graphs l Graph Labels Use Standard Labels Use Labels Given Here Eusen Run s Label Baseline furs Labet Baseline Current Print Black amp White Color Windows Printer Setup l Data to Graph Engine RPM a Plot Lines Thick O Thin Graph with Baseline Graph without Baseline Background Color Prvs Run Always Changes to Baseline Baseline is a Selected Run Black White Select Cunent Run as Baseline Graph Labels Use Standard Labels Use Labels Given Here Select Use Standard Labels for the program to put its standard labels on the graph Select Use Labels Given Here for the program to use the la
157. o summarixe the MPH in the Summary best matches the MPH on a quarter mile time slip Figure 1 3 Calculated Results with ET amp MPH Drag Racing Analyzer v3 0 Performance Trends GT5 0L a Back ENE Print Analyze History Help F1 E Notes Summary High Clutch Slip Tire Current ET 14 54 MPH 4 9 Notes esi Low Click on Notes for more Last 14 54 34 Wats Te Improvement 00 Results Summary am Summary of important Notes of Interest Click on Notes button for more info Last row shows Finish conditions 4809 3790 3991 m m a a aNNNN O 0 pp N KH NAUA C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 1 Introduction Figure 1 4 Calculated Results with Help Definition Drag Racing Analyzer v3 0 Performance Trends GT5 0L me Back Graph Print Analyze History Help F1 Notes 5 High Clutch Slip Ti Current Traction Low CBck on Notes eee ee 1054 span Click here or press 1 l Details Improvement i i the F1 key for Gear Time MPH__ Accel Gs Fest CRPM_ EngRPM Ta Mult C Sip 1 Sip zh general help on what 27 0 56 1 0 3000 1 00 100 5 53 H 3 3 56 0 480 4072 1 00 88 your options are at 522 this point in the EF Definitions of Results Sodrai Thrt 53 at the conditions 00 sec 3 3 MPH Ofeet into the run By clicking on a Definition of Thrt The percent of full power HP which H is being delivered to the tires This will be less than number in the 100
158. oduction attitude 4 degrees where a negative angle of attack is when the front is lowered and the rear is raised 32 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions pK K EE eee Ee SS ee 2 For this table an air dam is defined as a flat plate the full width of the vehicle projecting vertically down directly below front bumper based on typical 1970s or earlier design Most modern designs integrate air dams for optimum Cd therefore adding an air dam to a modern vehicle will likely show an increase in Cd but perhaps a reduction in Cl 3 For this table a spoiler is defined as a flat plate extending the full width of the vehicle at the top rear edge of the rear deck trunk lid angled back 209 from vertical e Clis the lift coefficient and is listed only to give the reader an indication of the trade off between aerodynamics and lift Race vehicles want to minimize lift for better traction e Table 2 2 shows typical effects from modifications Individual vehicle s can differ considerable e Advertised Cds are usually the best case For a realistic Cd add 03 to 05 to the advertised Cd 33 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions 2 5 Wheels Tires The Wheels Tires Specs describe the front and rear wheels and tires on the vehicle Figure 2 11 Wheels Tires Menu Specs in this right hand section are critical to traction and therefore have a large effect on ET 60 foo
159. of any spec and a brief description appears in the Help frame along with a page from this manual for more help You can return to the Main Menu by clicking on OK or clicking on an area outside this menu Now click on the Calculate Performance button in the Main Menu to calculate performance for this GT5 0L vehicle The next menu will show you the Calculate Performance Conditions menu as shown in Figure 1 2 For now leave all the Calculation Conditions as they are and click on the Calculate Performance button This will start the program calculating performance for the specifications of the GT5 0L stored in the Vehicle Library with the Calculation Conditions currently displayed A progress bar graph shows how the calculations are progressing The calculations may require several seconds on slower computers Figure 1 2 Calculation Conditions Menu Drag Racing Analyzerv3 0 Performance Trends GT5 0L 1 Calculate Performance Conditions Bg Track Weather l Wind Specs Method of Reading Weather Data Wind Speed MPH fo Radio TY Report with Dew Pt Wind Direction Calm No Wind E Corr Barometer Hg Track Specs Air Temperature deg F Track Length ft 1320 Quarter Mile a Dew Point deg F Rollout fio medium al Elevation feet Help Click on arrow to select how you want to enter weather info and the type of instruments you will Help i Calculate Performa use P XK Click here to calculate ET performance Help Comments
160. olumns for definitions 116 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 4 Examples Zue 4 12 Test ery of 7 Axle Ratios a ee a eae E nm D FiApri 98 5 0 gt5 0l Fri pr 17 98 4 5 gt5 0l Fri pr 17 98 4 0 gt5 0l Fri pr 17 98 3 5 gt5 0l Fri pr 17 98 3 0 gt5 0l Fri pr 17 98 2 5 gt5 0l Fri pr 17 98 2 0 Click on Test Title 1st column to change it or to retrieve specs which produced those results Click in other columns for definitions Now go through the sequence of e Increasing the Final Drive Ratio by 5 e Calculating results e Changing the time of day in the Test Title to the axle ratio just tested Once you have increased the axle ratio to 5 0 you will get a History Log that looks like Figure 4 12 Possibly to your surprise the 3 0 ratio close to the stock 3 08 is near optimum You may then think Why do drag cars have such low high numerical axle ratios Lets run these axle ratios again with the GT5 0L set up for drag racing Lets install slicks and drive more aggressively by changing the things identified in Table 4 1 Table 4 1 Modifications To Set Up GT5 0L for Serious Drag Racing Action on actual car Modification in the program to simulate this action Install 8 Slicks Construction changed to Drag Slicks and Tread Width changed to 8 in the Wheel Tires menu For now lets assume the slicks are no taller or heavier than the original street tires leave the Wheels Tires
161. or a Record Holding Funny Car A good analogy to the Drag Racing Analyzer is a flow bench A flow bench can not predict exact torque and HP curves but is still a vital tool for engine development In the same way use the Drag Racing Analyzer results as a guide or second opinion of how your vehicle should perform under near optimum conditions Iterations Before we talk about accuracy it is important for you to understand the types of calculations going on inside the Drag Racing Analyzer and other sophisticated simulation programs A simple program could involve calculating quarter mile MPH from HP and vehicle weight K2 Quarter Mile MPH K1 x Engine HP Vehicle Weight You enter an engine HP and Vehicle Weight and obtain a quarter mile MPH value The answer you obtain on the left side of the equation has no effect on the inputs on the right side of the equation 143 C Performance Trends Inc 1998 Drag Racing Analyzer Appendices However lets look at a simplified version of the equation which the Drag Racing Analyzer uses just to calculate the maximum potential tractive force traction the tires can produce Max Tractive Force Tire Friction x Wt on Rear Tires Wt Transfer Where Wt Transfer depends on the vehicle s acceleration rate which depends on the tires Max Tractive Force In this case the Max Tractive Force answer you get on the left side has an effect on the inputs to the equation on the right The only way
162. or so to prevent breaking out running faster than your Dial In 82 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 3 Output Figure 2 34 Dial In Menu Weather conditions for Weather and ET for previous run Dial In prediction to run the Index ET Menu bar of commands to open or save a file of Dial In Current Vehicle file specs copy specs from This must be the vehicle run to another update the these Dial In Specs are prediction etc for k Drag Racing Analyzer 43 0 Performa SG GRAND AM banc __ File vehicle Cala TAT a _ ald E Dial In Prediction File DIALIN o a Exit File Edit Advance pdate Prediction Help Previous Run Predicted Run Vehicle Specs Corr Baro Hg Corr Baro Hg Air Temp deg F Air Temp deg F Calm No Wind 1 Rel Hum RelHum eg Cie Estimate Change in 60 Foot Time 60 foot sec Let Program Estimate 60 ft time gt ET sec 78 BG foer see Calculate Parton General Specs and Comments Dial In Sec Method of Reading Weather Data Help Help CEE eA CENAA Radio TY Report with Rel Hum predict a Dial In setting produce a certain ET 4 Example of Dial In inputs These for certain changes in specs were obtpined frofn the conditions Comments you can enter to describe data These are The Dial In the program useful reminders when you recommends the ET the open a sav
163. or this Previous Run File DIALIN Predicted Run Rel Hum Rievation feet Wind Direction Tail Wind jz Estimate Change in 60 Fool p Let Program Estimate 60 ft time 5G foor sec 1 506 Dial In Sec l Help Click on down arrow button to pick the way to estimate any change in traction If you are not sure pick Program will Estimate p xx Enter weather conditions for your Predicted or Dial In Run Optional not shown here You can enter your estimate of the 60 foot time for the Dial In Run Click on Cle button to determine your Dial In You may want to adjust it to prevent a break out This safety factor would prevent you from breaking out should the car run slightly quicker than the predicted ET You will have to use your judgment based on your competition for the safety margin you need If you have good competition you will have to risk breaking out and use a small safety factor for example 005 seconds If you competition is poor use a larger factor for example 03 seconds Subtract this safety margin from the Predicted Dial In for your actual dial in For example with stiff competition your dial in would be Dial In 10 187 005 10 182 seconds Note The Safety Margin is now a separate input in Version 3 2 See Appendix 3 page 155 135 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 4 Examples You will noti
164. ort Length 61 Preferences 5 13 56 57 77 82 108 119 132 142 146 Print 5 1 2 8 18 91 97 98 103 166 Print Now 97 Pump Up 13 Quarter Mile MPH 61 63 122 143 Radius 36 37 68 69 Rating Type Tire 68 Rear Axle Ratio 27 60 65 113 114 117 120 Rear Track Width 28 30 67 126 Registered Owner 3 4 Relative Humidity 1 50 51 71 72 123 134 140 141 Remind on Tire Wt Change 13 Request Report Comment 104 Retrieve 5 99 100 108 Rolling Radius 36 68 69 Rollout 43 45 47 54 56 57 109 RPM 7 8 RPM at Peak HP 17 61 RPM at Peak Torque 17 61 62 Runner 60 Safety 4 3 8 27 29 81 86 91 93 135 140 142 Safety Margin 155 157 Save 1 5 19 79 84 90 100 131 Save As 79 84 Sec Increments 13 108 118 119 132 137 142 146 Setup 4 70 Shift 1 41 42 43 44 45 47 57 61 65 109 116 117 120 122 127 131 147 149 171 C Performance Trends Inc 1998 Drag Racing Analyzer Appendices Shift Throttle 41 44 149 Shift RPM 41 42 44 65 70 109 120 127 149 Shift RPMs 41 42 44 65 70 109 120 127 149 Shift Time 41 44 47 117 127 147 149 Slicks 36 37 117 120 Special Calculations 8 Stall RPM 1 23 40 45 46 75 124 148 Stall RPM at Launch 75 Supercharging 5 6 9 Suspension 26 28 30 31 70 145 T Slip 58 T S Start Time 81 140 Tech Help 3 4 Thick Lines 14 Thin Lines
165. os of other products or updates on this product 160 C Performance Trends Inc 1998 Drag Racing Analyzer Appendices Figure A6 Instant Updating of Results ET MPH and 60 ft time shown here and are instantly Wheel amp Tire Specs 10 855 131 07 1 822 60 ft updated after each change Rear Wheel Tire Specs Front Wheel Tire Specs Type Use Specs Below Type JUse Specs Below heel amp Tire Wt Ib a Wheel Tire WE Ibs Tire Diameter i ive Dialer mi cid Tire Diameter in pas cid Help Construction Drag Slicks g e in pounds p 35 Note Print and Tread Width in cid ue oon Traction Factor cid Tire Growth cic NK Help Print rint Setup Get Example Save Example If using this feature it is best to always close out each screen by clicking on the OK button then going to the next screen If you simply click on an option on the main screen while another screen is open the program can get confused and may drop some of the specs you have changed 161 C Performance Trends Inc 1998 Drag Racing Analyzer Appendices Figure A7 Open Screen Features Open a Vehicle File This is the normal way the screen would look as it would in Version 3 0 37 Vehicles in Library 1966 Chevy Nova Race 1968 Chevy Camaro Race 1968 Plymouth GTX Stock 1969 Chevy Chevelle Race 1970 Dodge SuperBee Hemi Race 1979 Chevy Malibu Race 1985
166. ottle stop comes on early or late in the run p xx enter your estimate of the 60 foot time for the Predicted Run Click on Clc button to deter mine the Throttle Stop setting to produce your Index ET 141 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 4 Examples in a safety factor of 010 seconds you do not need to adjust the 1 333 seconds for a safety factor Use the 1 333 seconds exactly Note The Safety Margin is now a separate input in Version 3 2 See Appendix 3 page 155 Next Run Assume you win your first round with a 9 905 ET For the next round s Throttle Stop prediction you are tempted to use your latest run to help predict a new throttle stop However because the difference between Previous Run 1 and your latest run is less than 3 seconds 9 905 9 760 145 the accuracy would not be good and the program recommends you do not do it Actually the program will not even calculate a Throttle Stop setting for the Predicted run if the ETs for the Previous run are not at least 2 seconds or more So from now on simply enter the new weather conditions for each round into the Predicted Run Enter your estimate of 60 foot time or let the program estimate it and set the new Throttle Stop setting on your timer for the new weather conditions Conclusions e The Drag Racing Analyzer can predict a throttle stop setting to run a certain ET Index under changing weather conditions based on
167. ou want The examples given here are only to give you ideas of how the specs change for various types of vehicles Also check the Vehicle Library for other examples of complete vehicles by clicking on File then Load vehicle or clicking on the Retrieve or Open button first on the left at the Main Menu You will notice that Vehicle Weights are not given here That is because vehicle weight is so critical for performance Itis best to weigh your particular car Be sure to include driver weight and the weight of all fluids C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 3 Output SSEEE gt EE gt E gt eeeeyeeyeyee gt E gt E gt EE gt yEex gt gt EEE _ gt E SEE type in 18 and press lt Enter gt The program will warn you that by changing this spec the name of the example will no longer be for a Mustang but will be changed to the general Use Specs Below You also have the example of saving your own sets of specs to the list of Component Examples If the current specs are not an example click on the Save Example button to be presented with the screen of Figure 2 40 Select Save and these specs will be saved to the example list with the name you entered Figure 2 40 Saving an Example Current Specs to be Saved Ss N Current Specs pec Name P Enter most any name Driveline Layout up to the number of k letters this box allows different number of letters for different components Frontal rea
168. ous inertia examples point out an error most users will make When you make a modification always think of how it could affect each specification The example of removing 40 lbs from the front wheels not only affected Front Wheels Tires WT but also Vehicle Weight and Wt on Rear Tires Below is a list of common modifications and the specs they may affect Engine Modifications Engine modifications can change all Engine Power Curve specs and Displacement If the engine is naturally aspirated not supercharged turbocharged or uses nitrous oxide and you increase the HP generally the RPM where the HP will peak will increase also Vehicle Weight and Wt on Rear Tires may also change if you change to aluminum components less weight or add a supercharger more weight etc Adding Removing or Shifting Weight e Vehicle Weight e Wt on Rear Tires e Front amp Rear Wheels Tires Weight Changing vehicle height e Height of CG e Frontal Area sq ft 152 C Performance Trends Inc 1998 Drag Racing Analyzer Appendices Changing wheels and tires All the Wheels Tires Specs Vehicle Weight Ibs Wt on Rear Tires Track Width Frontal Area sq ft Changing torque converter e Converter Capacity e Conv Tq Multiplication e Vehicle Weight 153 C Performance Trends Inc 1998 Drag Racing Analyzer Appendices Appendix 3 New Features in Version 3 2 Here is a brief listing of some of the features new in Version 3 2 154 P
169. p of the Main Menu and you are presented with the menu shown in Figure 2 33 This menu will let you predict the throttle stop setting usually the time the stop is ON or the throttles are closed required to produce some desired ET usually the Index based on 2 previous runs with different throttle stop settings Important points for accuracy include e It is important for accuracy that most all the other vehicle specs accurately match your vehicle before you use the Throttle Stop option This means that if you Calculate Performance for these specs you will get an ET within about 3 seconds and a MPH within about 2 MPH of what your car runs with No throttle stop e These 2 throttle stop settings should be significantly different ideally 1 producing a faster ET and 1 producing a slower ET than your desired ET e The prediction can still work even though both ETs are faster or slower than your desired ET as long as there is significant difference at least 3 seconds or more in the 2 ETs which is not caused simply by the weather change e The accuracy of the predicted Throttle Stop also depends on the Time Resolution setting in the Preferences menu available at the Main Menu 001 seconds gives better accuracy e All 3 runs should use the same weather instruments for all measurements without calibration or adjustment in between e Although you may not want to change your strategy predictions are best if the throttle stop comes on after the 6
170. quires only a quarter the HP to accelerate This is because not only do you have to accelerate the tires down the quarter mile you have to get the tires to spin faster also The spare tire in the trunk is easier to accelerate than the same tire mounted on the axle The tire on the axle has both mass and rotational inertia Rotational inertia is a part s resistance to changing its rotational speed Jack up the axle and try to spin the wheel Neglecting friction a heavier wheel requires more force to spin than a light wheel In addition if the mass is concentrated in the tire and less in the wheel it will require even more force to spin That is because rotational inertia depends on mass and the distance the mass is from the center of rotation See Figure Al For this reason rotating components with small diameters which concentrate the mass close to the center of rotation have much less inertia These components consist of the driveshaft axle shafts etc Reducing the weight of these components insignificantly reduces you rotating inertia Rotating components with larger diameters flywheel or torque converter wheels tires somewhat in the crankshaft damper and transmission components contain most of the vehicle s rotating inertia These are the components to concentrate on when trying to reduce rotating inertia For example removing 1 pound from the engine s flywheel will have 100 up to 1000 times or more effect on the vehicle s rotatio
171. r Brochure Lap Segmgnt Timer Brochure Click here to install Sto i r Other Products Install This Program View Fuel Economy Calculator Brochure r Upcoming Products Install This Program View Circle Track Log Book Brochure Inertia Calculator Brochure Valve Coil Spring Tester Brochure If you purchased a program click on that product s button to install it as described on your installation sheet You can install any of our other programs here as demos to see their features question asked to accept the default answers suggested by the Setup program Once you have installed the Drag Racing Analyzer there should be a Perf Trends icon or program group for you to click on under All Programs after you click on Start at the lower left corner There should also be a Drag Racing Analyzer v3 4 desktop icon you can double click on That is how most users will start the progream Entering Registered Owner s Name During your first setup the Drag Racing Analyzer will ask you to enter your name as the Registered Owner During this first session you can modify it until you are satisfied Once you accept the name the computer will generate a code based on the name Be sure you are happy with this name as it will appear on printouts and on your screen Click on About in the Main Menu to review your name and code C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 1 Introduct
172. r aor 93 m 43 69 mach1 Fri amp ph10 98 10 48 am 99 36 1 70 69 mach1 Fri pr Y0 98 9 56 am i d 101 06 00 69 mach1 Thu Aph9 98 6 45 pm 101 06 51 69 mach1 9 i i 101 57 68 92 69 mach1 i 20 32 65 68 92 69 mach1 g J 101 57 7 56 Click on Test Title st column to change it or to retrieve specs which Produced thode results Click in other columns for definitions Click here to show History Summary of Important Notes Test History not always shown Commands buttons for analyzing results Tabular Results 55 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions Improvement Summary The Improvement Summary section compares the final results of the current run with those of the previous run This saves you from writing down ETs and MPHs to see how much effect a given modification has on performance ET Elapsed Time in Seconds Is the time from when the vehicle s front tires uncover the staged light beam until the front tire breaks the finish line light beam at the end of the track Different tracks may have different locations and calculations regarding these light beams These differences may have some effect on the Rollout time but should have nearly no effect on ET If you have selected 001 second increments in the Preferences menu at the Main Menu ET will be reported in thousandths of a second MPH Final Velocity in Miles per Hour Is the vehicle s ve
173. r steady state dynamometer results with the engine equipped exactly as it will be in the vehicle Equipped means with the full exhaust and intake system all accessories running like water pump fan etc Steady state means that engine RPM is stable not changing when the torque and HP are measured This is sometimes called a step text Accelerating dynamometer tests where the engine speed is constantly increasing i e 300 RPM sec can under estimate an engine s steady state performance You may think an accelerating test best represents an engine accelerating in a vehicle However the Drag Racing Analyzer calculates the power loss due to accelerating the engine which changes in each gear See Inertia discussion in this Appendix 149 C Performance Trends Inc 1998 Drag Racing Analyzer Appendices Figure A1 Changing Rotation Inertia Rotating Base Inertia Inertia The difference between stationary and rotating mass is important for a racer to understand Ever racer knows that the less a car weighs the faster it can accelerate However not every racer knows that removing 30 Ibs from the vehicle s rotating components wheels tires engine flywheel will show a larger improvement in accelerating performance than removing 30 lbs from the frame or body Reduce weight 50 Same Diameter Inertia is reduced 50 Requires only half the HP to accelerate Reduce Diameter 50 Same Weight Inertia is reduced 75 Re
174. re Wt Change Don t Allow Instant Updating of Changes 3 v Allow Instant Updating of Changes Transmission Engine Graph Thick Lines Turning on Instant Engine Graph Thin Lines E Feroe 0i Eara volts fran vou wicks Calculations in Preferences m Front Wheel Tire s User defined Wheels amp Tires Rear Wheel Tire s 11 1 x 27 0 Street Radial ae Launch Program will limit tire spin starting at 3000 RPM Driving Shifts 4 sec Match RPM at Computer Picked RPMs Current Performance 11 766 124 87 2 012 60 ft Calculate Performance Coments 2011 Mustang 2dr Cpe Shelby GT 500 SYT 2 Door RWD 550 bhp 6500 RPM 510 Ib ft 5400 RPM Help 17723 mpg 4 passengers 3800 Ib Mfg Est Move mouse over item for 5 4 liter 8 cylinder Engine 6 speed Manual Transmission ee ee ee ae Sa Masia Sin rien ted Instant Results shown here Click on Help in menu line for W 7 200 Pound Driver cr Mont a Track Magazine Onine on main screen after each vehicle modification Figure A11 More Example Vehicle Files Open a Vehicle File 100 Ex Vehicles in Library Chosen Ex Vehicle File 2011 Dodge 2011 Chevrolet Camaro LT Convertible Coupe A Praveen 2011 Chevrolet Camaro LT Coupe raa 2011 Chevrolet Camaro SS Convertible Coupe k 2011 Chevrolet Camaro SS Coupe alee 6000 nes rane 3 92 2011 Chevrolet Corvette Coupe Pk Tq amp HP R whi D 2011 Chevrolet Corvette ZR1 3ZR 6s a Font A 24 98 2011 Chevy Corvette
175. riginal file is not changed If you want to delete your changes you can simply open a fresh unchanged copy of the original vehicle file from the Library If you want to keep your changes you must save them This can be done by clicking on the Save button You are also asked if you want to save your changes whenever you open a new vehicle and the program has detected you have made changes to the current file To save a Vehicle File you will be presented with the Save Window as shown on the next page The program suggests a new vehicle name which is the same as the current vehicle name shown at the top of the Main Menu If you want to save your changes to the same name simply click on OK This will update the current vehicle file with your latest changes If you want to save the current set of vehicle specs with your changes to a new name and leave the current vehicle file in the Library unchanged then click on the suggested file name and modify it as you want For example in the window shown on the next page you may want to add 2 to the current name MUSTANG to create MUSTANG 2 to indicate this is the 2nd revision of MUSTANG This is the safest way to make changes because you can always return to an earlier version and see what you had done 100 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 3 Output Figure 3 8 Saving Vehicle File Options Click on Save button to bring up this Save menu Click here to save specs to Ne
176. rmance under this agreement may be brought by either party more than one year after the affected party learns of the cause of action Refer to diskette envelope for full license agreement FEES AGG SISO IIE WT A R N DN Go PRLEKI oook The Drag Racing Analyzer makes calculations based on equations and data found in various published and heretofore reliable documents The program is designed for use by skilled professionals experienced with engines and vehicles The following processes are hazardous particularly if done by an unskilled or inexperienced user Obtaining data to input to the program Interpreting the program s results Before making measurements of or modifications to any vehicle engine or driving situation DO NOT FAIL TO Regard the safety consequences Consult with a skilled and cautious professional Read the entire user s manual Obey all federal state amp local laws Respect the rights and safety of others Table of Contents Chapter 1 Introduction 1 1 1 Overview of Features 1 1 2 Before You Start 2 1 3 A Word of Caution 3 1 4 Getting Started Installation 4 1 5 Example to Get You Going 5 Chapter 2 Definitions 11 2 0 Basic Program Operation 11 2 1 Preferences 13 2 2 Engine 15 2 3 Transmission 21 2 4 Body amp Axle 26 2 5 Wheels amp Tires 34 2 6 Driving Specs 38 2 7 Calculated Performance Test Results 49 2 7 1 Calculate Performance Conditions 49 2 7 2 Calculate Performance Test Results 55
177. rogram is now a 32 bit version fully compatible with newer operating systems starting with Windows 95 then 98 Me XP and 2000 This also allows you to use much longer more descriptive file names for saving vehicles throttle stop data and dial in data It is also more compatible with newer printers The program is now designed for 600 x 800 or higher resolution screens There is now a separate Examples folder for example vehicle files provided by Performance Trends New vehicles which you save will be saved to a separate folder of Your Saved Vehicles A new Preference lets you remove the Performance Trends Example Vehicles from Your Saved Vehicles if you have updated from Version 3 0 There are now File commands to save a vehicle file to a floppy disk or open a vehicle file from a floppy disk This makes it easy to copy a vehicle file from one computer to another You can now choose to list vehicle dial in and throttle stop files alphabetically as normally done or by saved date with the most recently saved files listed first This should make it easier to find recent files more quickly You can now choose to only list vehicle files which have certain words or phrases in their names like just Chev files Import files or Race files This should make it much easier for you to find example vehicles or your vehicles in a long list The user s manual is now available from inside the program by clicking on Help at
178. s Clutch Converter Transmission Type orque Converter Use Specs Below Type Ex Trans Auto Turbo Hydromatic iE Chach Diameter in fio Efficiency 29 60s AWD 3 amp 4 spd Aut Chach Fore ts 3333 i aoh Force ths First 1 Gear Ratio Chach Disks fi PORABI a Second 2 Gear Ratio Phach Material Organic rao fE i Third 3 Gear Ratio fi Converter Capacity fo Cony Tq Multiplication 2 Sint 6 Gearfatio o Converter Stall RPM based on Current Converter Capacity 4620 i Hel ius Cae e and Chek on down arrow button to pick a type of clutch or torque converter p 19 Body amp Axle Click on Body amp Axle at the Main Menu to open this menu You ll see 3200 lbs already entered from when we used 3200 lbs to calculate the HP based on quarter mile MPH For Axle specs enter the Monte s 4 56 and leave the Diff Lock Eff at 100 Spool For Body Details click on Type and select Pick Example Body Details There are no Monte Carlos in the list so select the closest match of Typical 60s 70s Intermediate This will load several specs but you will fine tune some to match your known measurements First click on the Cle button for Wt on Rear to open its Calculation Menu Enter the known weight of 1400 Ibs for Weight on 1 Axle and select Rear for Which Axle It calculates 43 8 as the Calculated Wt on Rear Tires Click on Use Calc Value to load it into the Body Details 125 C Performa
179. s determined by the engine s available torque as limited by Launch Throttle and the Converter Capacity 2 At the start the brakes are released and the throttle is opened as specified by the Launch Throttle The Throttle is gradually increased from the starting percents so it is at 100 at the end of the Launch Time 3 When the engine RPM reaches the 1 2 Shift RPM the automatic shifts to 2nd The engine RPM drops as much as required for the next transmission gear The throttle remains open 100 during the shift 4 The third step is repeated for each transmission gear until the vehicle finishes the run 46 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions Figure 2 17 Converter Launch Type Use Specs Below Drag Back Print Optoma Drag Racing Analy zer v3 0 case 40 and gradually increases to 100 at the end of Launch Time Graph Data types Drag Racing Analy zer v3 0O Note These graphs are available by selecting Clutch and Throttle as the Graph Data Types Notes The Launch Time starts when the brakes are released not when the E T clock starts For example if the Launch Time was specified as 1 0 second and there was a 3 second rollout the Launch Time would be over at 7 seconds on the E T clock If the first shift takes place before the Launch Time is over the throttle is still feathered into Gear 2 until the Launch Time has run out For automati
180. s to give you a margin of error to keep you from breaking out The Throttle Stop Predictions can now be based on just one previous run and an Adjustment Factor from a previous run This Adjustment Factor is obtained by doing a calibration run at some previous time See the detailed explanation later in this section for this more convenient method of predicting throttle stops The program will now Auto Link to our upcoming Engine Analyzers versions 3 2 Auto Linking means the Engine Analyzer screen will show the resulting MPH and ET from an engine change running the Drag Racing Analyzer program completely in the background A new Preference lets you obtain instant updates of ET MPH and 60 ft times from every change you make in the vehicle specs screens This can be a great time saver especially on newer faster computers Several new Example Vehicle Files have been added to make building your vehicle easier 155 C Performance Trends Inc 1998 Drag Racing Analyzer Figure A2 New Features in Results Screen 60 ft times now included in Improvement section A Drag Racing Analyzer v3 2 Performance Trends 10S BS Back Graph Print Analyze History Time Slip Help F1 Appendices Current Last Improvement 12 244 1 389 7 Notes Summary ery High Clutch Slip Tire Cmnts AE Notes Traction Very Low Wick on Notes for more Details ET 10 855 MPH 131 07 Time MPH Accel Gs Feet 5 1 RO 1
181. sec 660 foot 1 8 mile 9 45 8 53 92 sec 1320 foot 1 74 mile 14 57 13 34 1 23 sec 1320 foot MPH 94 93 97 57 2 64 MPH Advantage of This Vehicle over the Typical Vehicle Your vehicle s 1 4 mile MPH is 94 9 MPH where a Typical vehicle would run 97 6 MPH gt5 0l Mon Apr 13 98 9 57 pm 1320 294 618 2 30 25 14 57 04 94 93 4 43 69 mach1 Fri Apr 1098 10 48 am 1320 1789 2138 255 02 14 53 14 99 36 1 70 Click on Test Title 1st column to change it or to retrieve specs which produced those results Click in other columns for definitions 93 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 3 Output IMPORTANT The Drag Racing Analyzer can NOT anticipate all UNSAFE and poor performing situations Do NOT rely only on the Analysis report to point out problems and SAFETY HAZARDS You must use your own judgment expert advice from experienced engine builders and the manufacturer of the components Figure 3 4 Another Portion of Analysis Report Drag Racing Analyzer v3 0 Performance Trends GT5 0L Me Back Graph Print nalyze History Help F1 Notes Summary High Clutch Slip Tire Current ET 1457 MPH 94 93 Traction Low Click on Notes for more Last 30 69 Analysis Report Power is being limited by the program for 25 of this run to prevent tire spin during the launch This is somewhat high and is limiting the vehicle from producing low 60 foot times and ETs To reduce the amount of time power is being limited
182. t answer Yes Also notice as said in the Notes of the Calculation Menu the Power Corr is always set to Std Dyno 29 92 and 60 deg after using this menu to calculate Power Curve specs The General Engine Specs menu should now look like Figure 4 15 Calculate Performance Conditions Although it seems a little out of order to enter the Calculate Performance conditions now the weather conditions in this menu are used for some torque converter calculations So we will enter the Weather conditions now Click on the Calculate Performance button Before entering weather conditions select the appropriate Method of Reading Weather Data 122 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 4 Examples You use your own barometer instrument which reads actual not corrected barometer and have a Figure 4 16 Calc Menu for Rela wet and dry bulb psychrometer for humidity Click tive Humidity from Wet amp Dry Bulb on the Method of Reading Weather Data and select TEENA Uncorr Baro and Rel Hum There is no Wet and OU EMA AEE eA 26 Dry Bulb Humidity option Uncorr Baro and Dew Calc Relative Humidity Point would have been equally valid You will have to calculate Rel Humidity from Wet and Dry bulb Weather Inputs measurements by clicking on the Rel Humidity s Clc button Notice that Elevation becomes disabled Know Dew Point since you barometer measures the actual air Hutside Ax Te
183. t times etc Wheel amp Tire Specs Front Wheel Tire Specs Rear Wheel Tire Specs Wheel amp Tire Wt Ibs oe REN E T el Construction Street Radial l ick on down arrow button to pick a method o describing the type of wheel amp tire p19 Tread Width in Cid Traction Factor Cid Tie Biowih fio Front Wheel Tire If you have specified Front Wheel Drive as the Driveline Layout in the Body amp Axle menu this section will be labeled Rear Wheel Tire These wheel and tire specs are only used to estimate the inertia losses of accelerating these wheels and tires Type Click on this combo box to select to Let Program Estimate Specs recommended for most situations unless you are trying to estimate rolling inertia effects Use Specs Below or Pick an Example 34 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions Wheels amp Tires Wt Ibs This is the weight of one wheel tire assembly which can be obtained by weighing the tire mounted on the wheel on a weighing or bathroom scale The program assumes there are 2 front wheels and tires on the vehicle unless you have specified Motorcycle as the Driveline Layout in the Body amp Axle menu Tire Diameter inches The diameter of the tire is the distance from the tread across the center of the wheel to the other tread This is sometimes referred to as how tall the tire is See Tire Diameter in the Rear Wheel Tire section
184. tating inertia on the vehicle It is not always best to reduce engine inertia to improve acceleration That is because the engine is not geared directly to the road Engine RPM does not have to change at the same rate or even in the same direction as vehicle speed When the vehicle s speed is zero the engine could be spinning at 10 000 RPM Release the clutch and the engine RPM drops as the vehicle speeds up Because of this difference you can use the engine s rotating inertia to help accelerate the car For example an engine s flywheel spinning a 10 000 RPM stores tremendous energy This energy can be used to get the vehicle accelerating once you drop the clutch The flywheel also releases stored energy during shifts when engine RPM drops from the high speed of the previous gear to the lower speed in the next gear 151 C Performance Trends Inc 1998 Drag Racing Analyzer Appendices k K ee SS an The Drag Racing Analyzer estimates the rotational inertia of the engine and clutch flywheel or converter and transmission parts based on e Displacement in the Engine Specs menu the higher the displacement the higher the inertia e Clutch Specs like disks diameter clutch force the higher these specs the higher the inertia e Converter Capacity the higher the capacity the lower the inertia because this usually means a smaller diameter converter Tips on Simulating Modifications The previ
185. than Example 4 1 so it may be a better place to start if Example 4 1 looks complicated The results shown in these examples may be somewhat different than what you obtain with your particular version of the program That is due to minor upgrades in the calculations in later versions 107 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 4 Examples Example 4 1 Finding the Best Axle Ratio Features Introduced and suggested background reading e Read the Preliminary Example To Get You Going Section 1 5 Moving around in the menus and changing specs Section 2 0 2 2 2 6 Calculate Performance and evaluating results Section 2 7 History Log Section 3 5 Obtaining a printed hardcopy of the results Section 3 4 Example 4 1 will be fairly simple to get you started We will simulate a popular modification installing a different rear axle ratio We will see the effect on 60 ft times ET and MPH First start the Drag Racing Analyzer program following the procedure in Section 1 4 by either e Clicking on the Drag Racing Analyzer v3 0 icon in the Perf Trends program group Windows 3 1 e Clicking on Start Programs Perf Trends then Drag Racing Analyzer v3 0 Windows 95 e Clicking on the DRA EXE DRA program under the DRA30 directory folder under the PERFTRNS PTI directory folder using File Manager Windows Explorer Terms in parentheses are for Windows 95 You will be shown the Drag Racing Analyzer s M
186. the ET timer during drag racing This distance is generally 4 12 inches and is affected by tire size how the vehicle is staged timer light positions etc Rollout in can be measured by measuring how far your vehicle travels from the following 2 points 1 When the staged light first comes on assuming that is how you stage your car 2 When the staged light goes off or whatever else starts the ET timer from rolling forward through the beams At most tracks uncovering the staged light beam is what starts the ET timer Although a few inches appears to be a minor detail the rollout can affect the ET up to a couple tenths of a second If you want data reported where the timer starts the moment the vehicle starts accelerating like accelerometer or fifth wheel instruments enter a rollout distance of 0 54 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions 2 2 Calculate Performance Test Results The Drag Racing Analyzer s calculated output is shown in Figure 2 19B below Figure 2 19B Calculated Results Improvement Summary Drag Racing Analyzer v3 0 Performance Trends GT5 0L vir Back Graph Print Analyze istory Help F1 i r Notes Summary High Clutch Slip Tire Current ET 14 57 MPH 94 93 Cots Notes Traction Low Click or Notes for more Last 14 53 99 36 J l Details Improvement 04 4 43 a a e a a a E D o WWWWNHNNN w ceOj Hs4nauquuunnu he res Ol Mon Ap
187. the ET of a future Predicted Run with different weather wind and possibly traction conditions based on previous run Important points for accuracy include e Itis important for accuracy that most all the other vehicle specs accurately match your vehicle before you use the Dial In option This means that if you Calculate Performance for these specs you will get an ET within about 3 seconds and a MPH within about 2 MPH of what your car actually runs e The accuracy of the predicted Dial In also depends on the Time Resolution setting in the Preferences menu available at the Main Menu 001 seconds gives better accuracy and Dial In prediction to the nearest 001 seconds e Both runs should use the same weather instruments for all measurements without calibration or adjustment in between In this menu you can enter e Your vehicle s actual 60 ft time and ET for the Previous run e The weather and wind conditions which produced these results for the Previous run e The weather and wind conditions for the future Predicted run e Optional Your prediction of the 60 foot time for the Predicted run When all these have been entered click on Update Dial In or the Clc button by Dial In The program will make 2 passes simulating the Previous run you have already made and the future run you want to predict Based on these results the program will calculate expected ET or Dial In setting You may want to add a safety margin to this say 010 seconds
188. the input specs are adjusted to what they would be with the new Method For example Corr Barometer of 29 3 at an elevation of 1200 feet is converted to 28 03 Obs Barometer with Elevation disabled Elevation is not important when you are using an uncorrected or observed barometer as this type of barometer shows the actual air pressure at the track If you change from Uncorr Baro to Radio TV Report with a Corr Baro the program will ask for an Elevation for the track since this is needed to make the Barometer Correction All these different inputs are explained below Barometric Pressure Corr Barometer Hg This input is used for either Radio TV Report with Rel Hum or Radio TV Report with Dew Pt It is the Corrected Barometric Pressure in inches of Mercury you will hear from most any TV or radio weather report This spec is disabled if you are using an Altimeter because the altimeter alone is measuring the air pressure 50 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions Obs Barometer Hg This input is used for either Uncorr Baro with Rel Hum or Uncorr Baro with Dew Pt It is the actual or observed Barometric Pressure in inches of Mercury at the track These barometers measure the actual air pressure at the track and will read approximately 1 inches of mercury less than the barometric pressure you will hear from a TV or radio weather report for each 100 fe
189. the same To summarize we believe the Drag Racing Analyzer is the most precise and detailed software for predicting acceleration performance available to drag racers in this price range However it s predictions can differ from your vehicle s results This is primarily due to the assumptions made by the program and other points raised in this Appendix 146 C Performance Trends Inc 1998 Drag Racing Analyzer Appendices Appendix 2 General Tips The following tips will show you how to change the Drag Racing Analyzer calculations by adjusting various inputs Calibrating Tips Calibration is the process of adjusting the program s inputs to produce results which closely match a certain vehicle s drag strip results Example 4 2 shows this process in some detail Start with a file from the Vehicle Library which somewhat closely resembles your car Then modify all inputs you can measure or know for certain Also choose Computer Driven no tire spin as the Launch Type in the Driving Specs menu to let the computer launch the car There are other specifications which you probably do not know or are difficult to measure These uncertain specs which will have a major impact on performance include Uncertain Specifications Engine Power Curve specs unless dynamometer data is available Clutch Specs for manual transmissions Converter Capacity for automatic transmissions Transmission Efficiency Tire Growth Drag Coefficient
190. tions oh 8 Beere p ngine Cubic Inches If you select CID and Vol Eff the Peak HP RPM at HP Peak value is calculated using the following assumptions Notes e 85 mechanical efficiency at RPM at This calculation will produce approximate power HP Peak curve specs based on very simple inputs It always uses the Std Dyno Corr Factor The e 35 thermal efficiency Match Veh Performance option is a more exact e Gasoline as the fuel with an energy way to build a power curve based on more content of 19 000 BTU Ib vehicle amp performance specs e Dry air density of 0764 Ibs cu ft Use Calc Value The other Power Curve specs are derived from Peak HP and RPM at HP Peak and an assumed shape of the torque curve based on the Cubic Inches The RPM at HP Peak input at the bottom of the menu is always loaded back into the Engine specs menu These calculations are based on power corrected to the standard aftermarket dyno correction factor of 29 92 mercury and 60 degrees dry air Therefore anytime you use values from this menu the Corr Factor in the Engine menu will be set to Std Dyno 29 92 and 60 deg 62 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions Type of Calc Click on this combo box to select from e Quarter Mile MPH e Eighth Mile MPH e CID and Vol Eff Depending on your choice certain inputs will now be enabled Vehicle Weight Ibs Is the vehicle s total weig
191. to where you could click the Drag Racing Analyzer option There are other options which you can refer to your Engine Analyzer manual The process of loading Engine Analyzer results into Drag Racing Analyzer is nearly automatic and consists of 1 Once you ve selected the Drag Racing Analyzer as the program to Send the results to click on the OK Send button in the Engine Analyzer s Send menu to leave the Engine Analyzer 2 The Drag Racing Analyzer will be automatically activated and run 3 When the Drag Racing Analyzer stars up the first time you are given notice that a power curve is available and can be loaded from the Engine specs menu You will also notice some new commands on the Main Menu called Engine Analyzer Clicking on these will return to control to the Engine Analyzer program which originally called the Drag Racing Analyzer but will leave the Drag Racing Analyzer also running ready for a new power curve 4 Important Once you load the power curve the old power curve is gone unless you saved the vehicle specs including power curve with the Save command or saved it as an Example by clicking on the Save Example button at the Engine specs menu 5 When you are ready to return to the Engine Analyzer simply click on one of the Engine Analyzer buttons at the Main Menu or in the Test Results screen or commands in the Menu bar You do not have to load the power curve You can jump between the Engine Analyzer and Drag Racing A
192. to solve equations like this is through iterations Iteration is a process where you assume an answer use that answer in the right side of the equation calculate the actual answer and see if the actual answer is close enough to the answer you assumed Iteration Process For this example we will not use actual numbers since the calculations are quite complex Assume Max Tractive Force is 3000 Ibs Calculate that the vehicle acceleration could be 8 Gs and the Wt Transfer value is 600 Ibs Using the Wt Transfer of 600 Ibs we now calculate that the Max Tractive Force is 3200 Ibs Are assumed Max Tractive Force and calculated Max Tractive Force close enough within 20 pounds No so do again using new Max Tractive Force answer Calculate that the vehicle acceleration could be 85 Gs and the Wt Transfer value is 640 Ibs Using the Wt Transfer of 640 Ibs we now calculate that the Max Tractive Force is 3218 lbs Are assumed Max Tractive Force and calculated Max Tractive Force close enough within 20 pounds Yes SO an approximate answer is Max Tractive Force 3218 lbs If close enough was 200 lbs our first answer of 3200 Ibs would have been good enough If close enough was lb it may require many more calculations to arrive at an answer which is close enough If the equation is very complex and the inputs are an unusual combination no answer may be reached no matter how many times the calculation is performed This is call
193. ton which opens up another menu where you can calculate the value of a spec from other inputs Body Axle Specs Yi hile We Body Details dhicle Weight Ibs 3200 o Type Use Specs Below TE Driveline Layout Rear Wheel Drive Wheel Drive xle Speds Wt on Rear Tires 40 Final Drive Ratio 5 08 s ted cic Height of C G in 22 Diff Lock Eff 40 Prod Posi l Wheelbase in Da r Help Rear Track Width in 57 ts The weigh of the vehicle with the driver in pounds Frt Roll Stfns Modern Production J p xx Frontal Area sq ft z EA Drag Coefficient a2 a Click here to close menu Click here to obtain 1 to several screens of help to explain this menu Click here to display lists of examples of specs for this menu Click here to save the appropriate current specs in this menu as an example in the list of example specs Is the name of the example specs if an example was used or else called something like Use Specs Below where specs are not from an example or are modified from an example Other options include Let program estimate specs C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions 2 1 Preferences Figure 2 3 Preferences Menu Click on the Preferences item in the menu bar at Available from Main Menu the top of the Main Menu screen to drop down the JAAA UMS Agito ECan me hom S Preferences shown in
194. tor is available B Est Vehicle Weight for Vehicle Weight input at the Vehicle Specs screen Vehicle Specs Year 1970 7 Make Chevrolet z Model Camaro ba Engine Small Block 8 Displacement Calculator is Transmission Manual 7 available for Displacement in Convertible Ro the Engine Specs screen f Additional Weight Calc Displacement cu in Y Driver Weight Calc Displacement cu in 73 22 Satins ot Eval S a l Note Metric Displacement 4 good match was found Enter Displacement In ECs 7 Note new Print buttons Engine Displacement Help Cancel Print Use Calc Value Help Cancel 159 C Performance Trends Inc 1998 Drag Racing Analyzer Appendices Figure A5 New Features at Main Screen FS Drag Racing Analyzer 3 2 Performar ce Trends Open either Examples File vehicle CalcET Help Preferene s 7 RegTo Kel from Performance Trends Wes or vehicles you saved to Open Example Vehicle fropPerformarice Trends Open One of My SavedVehicles Ctr O you r separate libra ry Save Vehicle Ctri 5 Save As Ctri A i gt Options to save to or open from Click hereto pen from Floppy Disk find best Save To Floppy Disk floppy drive making it easy to Pee move vehicle files from one Print Blank Worksheet computer to another Windows Printer Setup axle ratio or converter defined Fron Wheel Drive Unlock Program Unlock
195. track conditions etc are rarely constant and repeatable The software should be used as a guide to Help you understand how an vehicle works what parameters are important how parameters interact what are the tradeoffs etc Point you in the correct general direction for making modifications This direction should be verified by other sources like known authorities time slips books etc Never trust one single source if it does not make sense to you Make you think not think for you If unexpected results are obtained take a minute to e Double check all your data input e Refer back to this manual e Ask someone else skilled and experienced in the particular area e Give the retailer or Performance Trends Inc s Tech Help Line a call for an explanation Computer programs are written by normal people who can make mistakes It s always possible there may be an error in the calculations Your phone call may help us correct it Please also read the Warranty and Warning at the beginning of this manual and on the diskette envelope C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 1 Introduction 1 4 Getting Started Installation You must install the Drag Racing Analyzer from the distribution disks a CD in version 3 2 floppy disks in older versions to a hard drive before it will run To do this from a CD simply install the CD in your CDRom drive and the Performance Trends Installation Wizard should automat
196. ument package so select it Load In a Practice Run You make your first practice run recording 10 150 at 134 2 with a 1 521 60 foot time The weather for this run was e 28 56 Hg e 74 degrees e 72 relative humidity e 14 MPH tail wind helping push the car down the track Enter this data into the Dial In menu for the Previous Run as shown in Figure 4 30 You are now ready to start predicting future runs Predict Dial In For your first round you measure the weather as e 28 79 Hg e 81 degrees e 66 relative humidity e 7 MPH tail wind helping push the car down the track The weather specs for both the Practice Previous run and the Predicted run are shown in Figure 4 30 The program predicts a 10 187 ET or Dial In based on your first run and the change in weather This is what the program predicts the car will run but you may not want to use this number for your Dial In as is but subtract off a safety factor 134 C Performance Trends Inc 1998 Figure 4 30 Dial In Menu Dial In Fredictivin Exit File Edit Advange Upffate Prediction Help il ly l Previous Run Obs Baro Hg Air Temp deg F RelHum Wind MPH 60 foot sec ET sec General Specs and Comments Method of Reading Weather Data Uncorr Baro with Rel Hum 2 Drag Racing Analyzer Chapter 4 Examples Enter weather conditions for an known Previous Run like a practice run Enter ET and 60 foot time f
197. ust not be less than the Wet Bulb Temp 71 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions Wet Bulb Temp deg F Is the temperature of the wet bulb thermometer on the psychrometer in degrees F The wet bulb has a wick or cloth covering the bulb which is moistened with water The dryer the air the greater the difference between the wet and dry bulb readings Relative humidity or dew point can be manually read off a Psychometric chart from these two readings This calculation replaces reading the chart The Wet Bulb Temp must be less than the Dry Bulb Temp 2 8 9 Relative Humidity ihepetding cayourchaweut Maliod oF Figure 2 30 Calc Relative Humidit Recording Weather Data you will be entering Calc Relative Humidity either Dew Point or Relative Humidity in the Calculate Performance Conditions menu or in Calc Relative Humidity the Throttle Stop or Dial In menus These humidity inputs at all these menus have a Cle Weather Inputs button This is the Calculation Menu you will TF get if you are using Relative Humidity ae futside Ak Temp deg E 77 Dew Point deg F aa Know Dew Point Dry Bulb Temp deg F Wet Bulb Temp deg F If you know the dew point of the air and the air temperature select Yes Otherwise select No to input Wet and Dry bulb temperatures from a Use Calc Value psychrometer Depending on your choice the appropriate inputs are enabled Outside Air Temp deg F
198. utch is released 100 and the throttle is opened 100 4 The third step is repeated for each transmission gear until the vehicle finishes the run Notes The Launch Time starts the moment the clutch is released not when the E T clock starts For example if the Launch Time was specified as 1 0 second and there was a 3 second rollout the Launch Time would be over at 7 seconds on the E T clock Figure 2 15 Clutch Launch Type Use Specs Below Drag Racing Analyzer v3 0 Performance Trends Print Options Graph Data Types HeipirF1 oe Racing Analyzer v3 0 Throttle 2 vs Sec Example of 50 Shift Throttle a Throttle v Starting at 40 Throttle and gradually going to 100 after Launch Time clohatch 0 Clutch during shifts Starting at 60 Clutch and gradually going to 100 after Launch Time 2 4 6 Note These graphs are available by selecting Clutch and Throttle as the Graph Data Types 44 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions Ka K m ESS 368 If the first shift takes place before the Launch Time is over the clutch and throttle are still controlled per the Launch Specs into Gear 2 until the Launch Time has run out Torque Converter Launch Type Computer Driven No tire spin 1 The engine is brake torqued at the converter s stall RPM Stall RPM is determined by the engine s available torque and the Converter Capacity 2
199. ve the torque and HP values you enter For production engines torque and HP values are corrected to conditions standardized by the Society of Automotive Engineers SAE These conditions are approximately 29 6 Hg 77 degrees F and 49 degrees F dew point humidity as specified by SAE procedure J 1349 For these engines click on the down arrow of this combo box and select SAE 29 6 77 deg 17 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions Dynamometers which mostly test racing engines typical of magazine articles generally correct their data to 29 92 Hg 60 degrees F and approximately 0 degrees F dew point no humidity For these engines select Std Dyno 29 92 60 deg Full Power Curve Features There are several ways to load in RPM torque and HP data into the table on the right side of the Engine menu You can Calculate one based on simple inputs you can load an Example curve you can load a curve calculated from one of our Windows Engine Analyzer Programs or you can simply type in readings If you type in readings as soon as there 2 readings for any set of 3 inputs the 3rd one is automatically calculated and filled in and the new point is added to the graph The graph always shows a sharp drop in power after the highest RPM point in the table This is to remind you that this is what the program assumes for calculations that engine power drops significantly like it ran into an overspeed a
200. vements mean that performance was hurt by the last modification An alternate way to see this comparison and improvement is to display the Test History Log Click on History as shown in Figure 4 8 and select Always Show History You will get the screen of Figure 4 9 with a history and comparison of the last 25 runs Although only 7 runs show you can click and slide the slide bar to see all 25 The History Log is a convenient way to keep track of your results to watch trends We will use it here to find the best axle ratio 114 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 4 Examples _tigure 4 9 Test Results with Test History Log History Options Drag Racing Analyzer v3 0 Performance Trends GT5 0LJ a Back Graph Print Analyze UGUA Help F1 r Notes Summary MALL ALEX CLD ET 15149 MPH 9514 RPM VewLow Show History Now 14 593 94 97 J Notes for more D4 Always Show Histo vement 556 History Log showing 2 0 Te me Heceetsireet Clear History ee and 3 08 axle 000 3 5 i i results and 2569 274 60 i 5 497 537 F 237 improvement 5 897 53 4 3 269 6 641 58 3 i 330 6 959 60 0 i 358 9 985 75 9 f 660 12 795 14 878 15 149 NNNNNNN eoooc WNhN o Click and move slide bar to Tes Tiie Em NST E EA a at5 Ol Fri Apr 17 98 10 34 am a E 2569 272 15 149 95 14 the last tests at5 0k Fri Apr 17 98 10 33 am 1320 1294 T 2297 272 1114593 E 94 97 at5 0l Thu Apr 16 98 9 48 pm 1320 294 618 25
201. w Vehicle name shown New name to save vehicle specs to Leave unchanged and click OK to save to the current vehicle name Click on name in box to change it then click OK to save it to the new name Name of current vehicle file you are eo with So ey Analyzer v3 0 Performance Trends MUSTANG File vehi gle Calc ET F Help F1 A About mes Cale ET ET EE Match Veh Perf Yeh Perf Throttle r oes aut Save Vehicle fo ue i New Vehigle Name MUSTANG and HP SAE Rating Enter a New Vehicle Name and click on OK The current ehicle name is given should you choose to modify it slightly for the new name Use the Delete key to erase the name if you want a completely new name EN OO D E Shifts 4 sec Match RPM at 5000 5000 5000 5000 RPM Certain vehicle names are not acceptable including e Names over 50 characters long e Names which include certain special characters like the slash The program will warn you if a character is not acceptable 101 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 3 Output Vehicle files are saved in the VEHDAT subdirectory in the DRA30 subdirectory under PERFTRNS PTI directory Unlike earlier DOS Drag Racing Analyzer programs you can copy Windows Drag Racing Analyzer files from programs on other computers to this directory and they will be found by the program In version 3 4 the path to the VehDat folder is now C Program Files Performan
202. ween shifts for example to 0 for the Shift Throttle the RPM will probably drop between shifts This specification is disabled if the vehicle is specified with a torque converter The computer then assumes the throttle is held wide open 100 Shift Throttle during the shift Shift RPMs Click on the down arrow key of this combo box to select to either have the program pick the shift RPMs recommended to make program easier to use or have the program Use Specs Below If you select Use Specs Below the Shift RPMs appropriate for the of gears in the transmission become enabled 41 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions 1 2 Shift RPM 2 3 Shift RPM 3 4 Shift RPM 4 5 Shift RPM 5 6 Shift RPM These are the RPMs at which the shifts take place For example the 1 2 Shift RPM specifies the engine RPM in first gear when the 1 2 shift starts Note If the clutch is slipping when a shift RPM is reached the computer will wait until both the engine and the clutch have reached the Shift RPM Therefore occasionally the engine RPM in the results will be higher than the RPM specified for the shift Because these specs have a Clc button you can have the program calculate optimum shift RPMs and fill them in into these specs See Section 2 8 7 Driving Specs Summary To summarize the driving specifications the sequence of events for a run for different cases is illustrated below Clutch Launch Typ
203. when the computer is trying to eliminate tire slip results an or as directed by Launch Throttle or during shifts p explanation and N definition is given including a page number in this manual for more information 1 RO 1 1 2 2 2 2 3 3 3 3 4 4 The menu bar and the command buttons at the top of the screen shows some of the options for various formats for data output e Analyze will produce a report of performance and safety tips on the test results e Graph will produce various types of graphs You can also compare the current results to results of the previous run or some other Baseline you have saved e Print lets you print these results on your printer If you have a printer hooked up to your computer try the Print command by clicking on Print in the menu bar or on the Printer button A small menu of printout options are presented These options allow you to enter a report comment include vehicle specs and comments in the printout etc These options are explained in Section 3 4 For this first time accept the default settings and print the report by clicking on Print Results To help explain the other columns of output simply click on those results A definition of that particular data will be presented in a Message box as in Figure 1 4 Then click on OK when you have read the definition For a detailed explanation of all the results Calculation Conditions and output options go to Section 2 7 and Chapter 3
204. y Help F1 Notes Summary High Clutch Slip Tire Current ET 14 57 MPH 94 93 7 Tragtion Low Click on Notes for more Last 30 69 48 43 Click on 16 12 46 50 and slide slide bar button to display all Test Results Click on and slide slide bar button to 1320 i T 43 display 1320 i 3 69 16 43 46 entire 1320 History 1320 i 69 macht Ffi 1320 33 06 Log 69 mach1 1320 1 2 2 2 2 3 3 3 3 3 Click on Tqst Title 1st column to change it or tp retrieve specs which produced those results Click in other columns for definitions Performance Summary Notes Summary and Notes button giving performance tips Command Option Buttons 91 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 3 Output Figure 3 2 Additional Output Options Click here or here to graph these results Click here or here to print these results Click here to create Analysis Report giving performance tips as described in Section 3 2 Click here for History Log options Click here for help on Test Results Diag Pacing Analyzer v3 0 Performance Trends GT5 0L R EA Pfint Analyze History Helf F1 Notes Summary High Clutch Slip Tire Current ET 1457 MPH 94 93 RE pE QI Hoes j Notes Traction Low Click on Notes for more Last 30 69 48 43 Details Improvement 16 12 46 50 A E e E ener R E E w COO u am m N AN N N N aN mWWWWNNNDN z Ol Tue Apr 1498 8 03 pm j IEE r3 50 gt5 0l Tue Apr
205. your best estimate of the tire s diameter when mounted on the car Radius Since Tire Diameter has a Clc button see Section 2 8 5 for calculating Tire Diameter from other tire specs like Tire Diameter Radius x 2 Rolling Radius Circumference or production tire sizes like P225 60 15 Construction The Construction type for the drive tire has a large effect on traction and therefore a large effect on the vehicle s maximum acceleration ability Click on the down arrow of this combo box to be presented with a list of choices The Construction type and the following tire specs will determine the traction capability of the tires and the amount of tire growth at high speed If you select anything other than Drag Slicks the Tire Growth specs is disabled as these other types of tires do not exhibit much growth Tread Width Is the width of the tire s contact patch on the ground Tread Width will only have a large effect on traction if you have specified Tire Type Drag Slicks Traction Factor Traction Efficiency describes how well the tires hook up to the road surface It is affected by road surface condition concrete vs asphalt amount of traction compound etc tire conditions temperature pressure compound etc and suspension setup 4 link adjustments shocks etc 36 C Performance Trends Inc 1998 Drag Racing Analyzer Chapter 2 Definitions L _ E _ E E eee e ae Obv
206. ys printed You Other Printout Types gt 5 i i have to turn off the Print Blank Worksheet K picture at the main a Seepage 13h screen to have it not manual for more into P a printed Print Report Using These Spe mR mRWWWWNNNN Drag Racing Analyzer v3 4 Registered to This Report Printed Eng 2011 Ford Mustang 2dr Cpe Shelby GT 500 Kevin Gertgen 4 41 35 pm 05 12 11 Calculated Test Results Performance Trends C 2009 Page 1 Example of printout with graphics file Projected Performance Gear Time MPH Accel Gs Feet CRPM EngRPM _Tq Mult __C Slip T 9 790 112 25 973 5258 9 951 113 73 1000 5365 11 766 126 02 1320 5887 Current MPH 124 87 Last 124 87 Improvement 00 Aa Blo w wl ply he 166 C Performance Trends Inc 1998 Drag Racing Analyzer Appendices TE Figure A10 Instant Calc results on Main Screen Preference for new tire ETOS calculation method Drag Racing Analyze 2011 Ford Mustang 2dr Cpe Shelby GT 500 File vehicle CalcET Help gti inc Reg To Kevin Gertgen Defaut Floppy Drive currently A T if Open Vehicle Library k Aust Nntimiza o 01 Sec Increments runs faster i il v 001 Sec Increments more exact Save Vehicle to Librar Beginner Level Experienced Level v Use Updated Calculations for P Metric Tire Sizes Vehicle Specs Use Original Calculations for P Metric Tire Sizes a Remind On Tire Wt Change Engine Don t Remind on Ti

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