ET-1000Z ET Predictor II Palm PDA
Contents
1. RH Therefore when it becomes time to predict your next ET it isn t necessary to remember all the previous weather variables You only have to remember the Current HCF and Actual ET from each run When you wish to predict a future run the CURR HCE and Actual ET from your time run will become the BASE HCF and BASE ET that you enter into the Edit Base Run Screen Step 1 Establish Base Performance Immediately after each time trial run the STP ET Function to calculate the Current HCF for that run If you are running on a Compulink equipped track you may wish to use the Run Seg Analysis Function to calculate the Current HCF and to analyze your performance For the following example we will be using the STP ET Function and Gasoline Fuel Mode We ll say that on the first time run we ran ET of 9 352 a 60 Foot time of 1 348 and the weather conditions were Barometer 29 82 Temperature 73 and the RH 56 If using an Altimeter enter the altimeter reading as the Elevation and always put 29 92 in for the Barometer Tap on the STP ET button Using an uncorrected barometer absolute pressure the Elevation should always be set to 0 Enter 0 for the Elevation Enter 29 82 for the Barometer Enter 73 for the Temperature Enter 56 for the RH Tap on Calculate The program will report Current HCF 1 0374 Vapor P 0 459 Air Density 95 7376 Density Alt 1 476 Dew Point 56 4 This is the air for your first pass Tap on Continue Next enter the Actual ET2. of 9 352 that the car just ran The program will report STP ET 9 238 This is the STP Corrected ET The STP ET is the time that the car would have run if the weather conditions were perfect On non throttle stop equipped cars the best run of the day will normally be the one with the lowest STP ET We will use this run as our Base Run The Base 1320 ET will be 9 352 the Base 60 Foot will be 1 348 and the Base HCF will be 1 0374 Step 2 Input Base Run Tap on the Edit Base Run button Enter the Base HCF as 1 0374 the Base 1320 ET as 9 352 and the Base 60 as 1 348 Tap on Store The computer will remember this information when you are ready to predict your next run Step 3 Predict ET Two hours later let s say you are in the staging lanes awaiting your first round The new weather conditions are Barometer 29 88 Temperature 70 RH 60 Tap on the ET Prediction button Enter the new weather conditions and tap on Calculate The program will then report the Predicted ET of 9 332 and the Predicted 60 Foot ET of 1 345 This is the predicted performance and is what your car should run under the current weather conditions providing that the air fuel ratio is correct On gasoline engines the air fuel ratio must be about 12 5 to 1 for proper results It is important to understand that the Base 60 Foot ET is not used in predicting the full track ET Rather it is used to predict the 60 foot time only The predicted 60 foot time is used to keep track of th
3. when predicting ET the program needs to know what fuel you are using To change the Fuel Mode tap on Menu tap on Fuel Mode and then tap on Gasoline or Methanol The current Fuel Mode is always displayed on the Main Screen Air Calculations The program uses the Elevation Barometric Pressure Temperature and Humidity to calculate the current Horsepower Correction Factor Current HCF Air Density Index ADI and Density Altitude DA Dew Point and Vapor Pressure The formulas used in this program are the same ones used in our ET Predictor II hand held computers ET Predictor software and RaceLog Pro software They are the most accurate formulas to be found in this industry The ET Predictor uses a standard of 0 elevation 29 92 In Hg pressure 60 degrees F and 0 relative humidity Under these conditions the HCF equals 1 0000 and the ADI will equal 100 000 percent Elevation Range 3 000 to 26 000 Feet Elevation is only used if you are using an altimeter or a corrected barometer If you re using an uncorrected barometer reading absolute pressure always enter 0 for the elevation If you have an altimeter calibrate it to 29 92 In Hg and enter the reported altitude as the elevation If you are using an analog barometer and your altitude requires that you use a corrected barometer then you should always enter the number of feet equal to the amount of correction when you calibrated the barometer Digital barometers and altimeters measur
4. with using a Palm device first read your Palm user manual on the Palm CD that came with your PDA Then install the Palm Desktop Software to your PC Charging the Battery The programs installed in the Palm Zire PDA are battery backed Therefore you must keep the battery charged at a sufficient level to maintain the programs You should fully charge the PDA at least every two weeks A battery level indicator at the top of the Applications screen continually shows the current state of the rechargeable battery You can charge the battery with the included power supply or with the USB cable attached to the PDA and your PC If you are not going to use the PDA for an extended period of time leave it plugged into your PC Backing Up Your PDA Using the USB cable you should also back up the installed programs to your PC by performing a Hot Sync operation through the Palm Desktop Software If you allow the battery to fully discharge in the PDA you will need to Hot Sync the PDA to your PC to restore its memory and installed programs But if you don t initially perform a Hot Sync operation then you will not have a backup of the software and the PDA will have to be returned for programming Starting the Program Once the program has been installed and registered you can start it from your Applications screen Tap on the ET Predictor icon to launch the program If you bought the PDA from us the software is already registered Entering Data into the Pro
5. 22 1991 at the same track Because of the difference in weather conditions between July and September the actual ET s differ by about 2 tenths of a second even with the car running on methanol However the STP ET s vary by only 003 Look closely at the actual times and corrected segment times for each run These examples show a perfect combination at work Using the numbers from the previous weekend at Cecil County the ET Predictor predicted an ET of 8 864 for the first example The car ran 8 866 Two months later using the first example as a base line the computer predicts an 8 737 The car ran 8 740 Very consistent and very predictable In order to compare these two 2 runs after using the Run Segment Analysis program you simply subtract the corrected segment times from each other and note the difference as a plus or minus For example on the first run the corrected 0 60 segment was 1 258 On the second run the corrected 0 60 segment was 1 255 The difference is 003 Since the corrected segment on the second run is smaller than the first this becomes minus 003 or 003 On the second run the 0 60 segment then was 003 faster than the first So traction was better Doing the same for each pair of corrected segment times will show the variance at each point on the track You can watch shift points throttle stop function head or tail wind traction and other variables If your predicted ET s are not matching your actual perf
6. 749 1 716 1000 1920 ET 1 496 1 468 STP Corrected ET 8 701 COMMENTS Predicted ET was 8 864 Current HCF was 1 0983 Figure 1 Air Density was 89 507 660 5 627 MPH 122 46 660 1000 ET 1000 7 370 ET 8 866 MPH 149 92 ACTUAL PERFORMANCE DATA 9 22 91 Cecil County Dragway MD RUN 2CTRIALD ELIM LANE2 Circle WIN LOSE 1ST FOUL BREAKOUT Circle DIAL Run Segment Analysis TM RT 480 O 60 ET aad 1 255 003 60 1 261 60 330 ET 2 307 2 297 001 330 3 568 330 660 ET 004 MAEA 1000 1320 ET 002 STP Corrected ET 8 704 COMMENTS Predicted ET was 8 737 Current HCF was 1 0207 Figure 2 Air Density was 97 522 660 5 542 MPH 723 87 660 1000 ET 1000 7 267 ET 8 740 MPH 152 20 Example of Run Segment Analysis Compare 2 runs by subtracting the corrected segment times The difference at each point is the variance in performance that is not due to changes in the air density but other variables like traction shift points throttle stop head wind or tail wind Print _Click here to purcha
7. Family Software 3164 Surrey Lane e Aston PA 19014 e 610 497 5561 Drag Racing Computers and Software www iFamilySoftware com ET PREDICTOR II v7 50 for Palm OS Instructions Welcome to the world of high tech drag racing The ET Predictor II software from Family Software will enable you to properly manage air fuel ratios for the current air density track vehicle performance or modifications and accurately predict elapsed time and throttle stop settings according to varying weather conditions Included are programs to calculate Air Density Horsepower Correction Density Altitude Dew Point Vapor Pressure Corrected Elapsed Time Run Completion and our exclusive Run Segment Analysis program for Compulink style race tracks The next best thing to having an on board computer The ET Predictor is the most accurate ET Prediction and Weather Station software available The ET Predictor provides a Horsepower Correction Factor HCF and Air Density Index ADI using a standard of 0 elevation 29 92 In Hg pressure 60 degrees F temperature and 0 percent relative humidity Under these conditions the HCF equals 1 0000 and the ADI will equal 100 0 percent The HCF and ADI compensate for pressure temperature and relative humidity Conditions that improve the HCF and ADI are cold air high air pressure and low humidity The Palm version of the ET Predictor looks and works exactly like a Windows program on your PC If you are not familiar
8. ave run under perfect weather conditions This creates a basis to compare one ET against another regardless of the weather conditions associated with the run When you have removed all the variables ideally the STP ET should be the same for every run The ET Predictor II has a unique feature for locating these variables Run Segment Analysis is for use with quarter mile tracks with a timing system reporting 60 330 660 1000 and 1320 foot elapsed times Other than having an on board computer it is the best method to get maximum consistency and performance from your race car After entering the above times the compute r Ea 7 Palm ET Predictor II as Six 6 separate distance segments These are the 0 60 60 330 330 660 660 1000 1000 1320 and 0 1320 foot distances Reported are the actual time and the STP time for each of the above distance segments This allows you to analyze what the car is doing at any point on the track Correcting the segment ET s allows you to compare every run at a glance This reveals to one thousandth of a second any variable that exists in your combination or driving style Then after optimizing your combination you can see any variance between lanes or from track to track Figure and figure 2 are actual runs made within two 2 months of each other Each run was the second time trial of the day The first example is from July 20 1991 at Cecil County Dragway MD The second example is from September
9. cessary to use methanol calibrated weather computer Always use the readings from your own gauges What someone else is doing will not help you Keep your gauges outside in the shade and shielded from the wind Even with the doors wide open a trailer will absorb and retain radiant heat from the sun The readings will never be accurate This is why you cannot use the weather readings reported on your time slip Depending on the time of day and location of the sensors temperature readings will vary by 10 degrees or more from the actual temperature Use a hood scoop or fresh air system of some sort When you want to predict an ET based on ambient temperature the actual inlet air must be at that temperature Under hood temperatures are higher than ambient air and result in poor and inconsistent performance if allowed to enter the carb inlet Copyright 2004 Family Software All rights reserved No liability is expressed or implied We shall not be liable in any event for claims of incidental or consequential damages in connection with or arising out of the furnishing nerformance or use of the program s l 8 Palm ET Predictor II Run Segment Analysis ACTUAL PERFORMANCE DATA 7 20 91 Cecil County Dragway MD RUN 2CTRIAL EUM LANE Circle WIN LOSE 1ST FOUL BREAKOUT Circle DIAL Run Segment Analysis TM RT 522 0 60 ET 60 1 282 60 330 ET 330 3 622 330 660 ET 1 999 1 961 1
10. e absolute pressure without any need for correction so their use is preferred Barometer Range 12 to 35 Inches Hg If you re using a barometer to obtain the air pressure enter the barometric pressure from the gauge When using an altimeter always enter 29 92 for the barometric pressure Temp F Range 10 to 130 degrees F Enter the temperature from a digital thermometer or other temperature gauge From round to round temperature changes are apt to affect performance more than any other variable RH Range 0 to 100 Per Cent You can use a digital hygrometer to find the relative humidity At low temperature relative humidity has the least effect on performance However at high temperatures the effect is much greater For example 50 RH at 60 F will result in a 01 loss in power while at 90 F the addition of 50 RH equals about a 03 loss in power Changes in temperature are also more critical under high humidity The following is more information on the resulting calculations Current HCF Current HP Correction Factor The Horsepower Correction Factor is computed using the current weather conditions that you enter In other words the HCF equals the current elevation barometer temperature and humidity When the HCF is higher less horsepower is produced and the car will run slower So the lower the HCF is the faster the car will run You can use the HCF to determine the variance in horsepower or torque that is being produced u
11. e racing season in your area Then richen the mixture until the car slows down The car may go faster at first as it is probably too lean After this you shouldn t have to re jet until the air density changes four 4 per cent or more By adjusting the fuel mixture for an average air density of 96 per cent for example the air can range from 92 to 100 per cent without having to re jet A quick way to check for proper fuel mixture is to check the color inside the headers This should be a very dark gray or almost black If they are white to a light gray the mixture is way too lean As the air density changes from week to week you will actually see the color change The header color will appear lighter as the air density increases and darker as it decreases You can also use an Exhaust Gas Temperature EGT gauge to evaluate jetting changes Call us for information on our Digital EGT kits Analyzing Performance After adjusting the fuel mixture properly the car should consistently run right on the predicted ET If it doesn t there are variables in your particular combination Your computer will help you to find these variables Start by correcting every ET to STP and recording it in your racer s log for every run STP is the abbreviation for Standard Pressure also known as sea level conditions In correcting the ET we remove the effect that the current atmospheric conditions have on the run Therefore the STP ET is the elapsed time the car would h
12. e traction factor If your actual 60 foot time is not the same as the predicted 60 foot time the amount of traction available is changing You may have to adjust your dial to compensate for varying track conditions If you enter a Base 330 Base 660 or Base 1000 time then a predicted ET will also be reported for each of these Enter a 0 for any BASE time that you don t have or do not wish to use The computer will then skip that predictio 6 Palm ET Predictor I Note For eighth mile tracks always enter a zero 0 for the Base 1000 and Base 1320 Displacement Compression Ratio Program To find your engine displacement and or compression ratio tap on Menu tap on More and tap on Displ CR The Displacement program first asks you to enter a value for the following variables bore stroke and number of cylinders As you enter each value the displacement is re calculated and displayed Once you have calculated displacement tap on Main Menu to return or tap on Continue for the Compression Ratio screen The Compression Ratio screen additionally asks for the cylinder head chamber volume cc s head gasket thickness deck height and piston dome volume cc s For negative dome volumes enter a minus sign before the value as in 4 4 As you enter each value the Compression Ratio is re calculated and displayed The gasket volume is calculated from the cylinder bore size and the head gasket thickness It is more accurate to enter the actual gaske
13. er Cowco a Factor Current HCF calculated from the air conditions when you made the run and the perfor go 4 Palm ET Predictor II your time slip Tap on the button for the data field you wish to edit Tap on Cancel to abort or Store to save this new data STP ET Function This function is used to quickly correct any ET 60 330 660 1000 or 1320 to standard pressure STP conditions It uses the air conditions from when you made the run and the Actual ET that you enter After entering the Actual ET the STP ET will be reported As an example for gasoline fuel and weather conditions of 0 Elevation 29 65 Barometer 75 Temperature and 45 RH an Actual ET of 9 337 would be equal to 9 204 after being corrected to STP Comparatively for completely different air conditions of 0 Elevation 29 80 Barometer 67 Temperature and 68 RH an ET of 9 298 will also equal 9 204 at STP This program calculates and then removes the effect that the current air density had on the run This creates a basis to directly compare one ET against another regardless of the weather conditions associated with the run Comparing these two STP ET s shows us that this particular car is responding perfectly to changes in weather conditions and is consistent right down to the thousandth The corrected ET STP ET is how fast the car would have run under perfect STP weather conditions Edit Base TS Throttle Stop Function This is where you enter your Base Thro
14. gram Entering numeric data into a handheld Palm device can be tedious at best We ve made it a lot easier and more fool proof by designing an Input Screen that contains large buttons for each numeral and function The Input Screen works just like a calculator Whenever the program requires data or when you wish to Edit data you will be taken to the Input Screen At the top of the Input Screen is a Label that shows which variable you are editing Tap the C button to clear the data field or the lt button to delete the last numeral entered Tap on Cancel to abort without saving your changes or Enter to accept your changes The value that you enter is tected anainct a range of expected values for that particular data field If you enter a number that is outsic Hr 2 Palm ET Predictor II range or the number is not a valid numerical expression you will be alerted to your mistake and returned to the Input Screen Each variable has an Edit button and a data field The Caption on the Edit button shows the variable name For example Elevation 0 In order to edit the value for any data field tap on its Edit button In this case tap on Elevation and the Input Screen will appear asking you to enter a new value for the variable Elevation Fuel Mode The Fuel Mode is used to set the weather correction calibration used in the program to either Methanol or Gasoline When correcting elapsed time ET to Standard Pressure STP or
15. nder different weather conditions For example if your engine produces 400 horsepower with an HCF of 1 012 it will produce 404 80 horsepower at sea level conditions STP or 1 0000 400 x 1 012 404 80 i a 3 Palm ET Predictor II Vapor Pressure Vapor Pressure is the exact portion of barometric pressure that is present due to Relative Humidity or moisture in the air Vapor Pressure is used in calculating the horsepower correction Air Density Air Density Index The Air Density Index ADJ is the computed ratio of the current density to that of STP with STP having an index of 100 percent This factor is used to determine the correct jetting or pill size required under varying weather conditions The higher the ADI the more air there is available for combustion Therefore more fuel must be burned to maintain the correct air fuel ratio When using gasoline a four 4 percent change in the ADI will usually necessitate a change in jet area in order to maintain the same level of performance Holley jet sizes are about 4 percent apart in flow area If the ADI goes up four 4 percent for example 100 0 to 104 0 increase all jet sizes by one number And if the ADI goes down four 4 percent for example 100 0 to 96 0 decrease all jet sizes by one number Density Alt Density Altitude Density Altitude DA is the current air density expressed in feet of elevation DA is also known as the corrected or relative altitude DA is not scie
16. ntific and is very inaccurate Therefore we do not use this factor in ET Prediction We only report this value for information purposes only Dew Point Dew Point is the calculated temperature at which condensation moisture occurs based on the entered air conditions Dew Point will tell the racer when the traction on the race track will worsen due to condensation When the actual measured air temperature matches the Dew Point temperature the race track will be wet Main Screen Functions To use one of the Program Functions just tap on its button ET Prediction Function Using a base line of performance consisting of a previous ET Base ET and its associated Horsepower Correction Factor Base HCF this function will calculate and predict your ET under new air conditions This program will also predict 60 330 660 and 1000 times if these are entered into the Edit Base Run Function Be sure that the Fuel Mode is set correctly Enter the Base HCF and Base 60 Base 330 Base 660 Base 1000 and Base 1320 times in the Edit Base Run Function from the run you wish to predict your new ET from After entering your base run information tap on the ET Prediction button enter the new air conditions in the Enter New Air Screen that appears Next click on the Calculate button The predicted ET s will appear in the ET Predictions Screen Tap on Continue and the Current Air Screen will appear showing the Current HCF Vapor Pressure Ai
17. ormance this analysis will show you why and where to look for problems If every segment is off by the same amount in the same direction plus or minus then you should look for a jetting problem Being too rich or too lean will affect every segment time Traction problems will show up in the 0 60 and 60 330 segments Variation on second gear shifts usually occurs in the 60 330 segment Head wind and tail wind will affect the 660 1000 and 1000 1320 segments For wind to be the culprit both segments should be off in about the same amount and in the same direction Fuel delivery problems can be mistaken for a head wind Your throttle stop factor consistency can even be accurately checked by watching the segments where the stop functions When the corrected ET s are close to perfect the predicted ET s generated by the computer will be dead on ET Prediction Hints and Tips By comparing the STP ET s from every run you can find out exactly how consistent your car is If the STP ET s vary by 02 then you may want to dial 01 or more under the predicted ET to avoid breaking out This is especially true for the car being chased This driver needs to have the confidence to run it out the back door if necessary One of the rumors concerning methanol is that changes in the air will not affect performance Any naturally aspirated engine running methanol at a proper air fuel mixture will respond to changes in air density So when using methanol fuel it is ne
18. r Density Index Density Altitude and Dew Point To use this function for eighth mile ET Prediction simply enter a zero 0 in the base run fields for the 1000 foot and 1320 foot If you are a throttle stop racer doing this will also set the Throttle Stop Prediction Function to capture the eighth mile ET for predicting the timer duration for an eighth mile track Throttle Stop Prediction Function This function is used to predict a new throttle stop timer duration setting based on a previous run its corresponding throttle stop duration Base TD and your existing throttle stop factor TSFactor You can enter the base throttle stop information for your Base Run in the Edit Base TS Function After you run the ET Prediction Function then tap on the TS Prediction button The Predicted ET along with the current Index Throttle Stop Factor and Base Timer Duration is transferred to the Throttle Stop Prediction function automatically Tap on Calculate to get the new Timer Duration Notice that you can also edit any of these fields For example if you wanted to change the Index from 8 900 to 8 906 you can do that here without having to go back to the Edit Base TS Function However any data fields edited will also be changed in the Base TS Information If you do make changes be sure to tap on Calculate to update the Predicted Timer Duration Edit Base Run Function This is where you enter your Base Run Information The base run consists of the Horsepow
19. ry with every pass ideally the STP segment times between passes should be the same By comparing the STP segments between two runs you can see traction variances throttle stop function wind and other variables that affect performance and prediction Traction problems will be seen at the 0 60 foot and 60 330 foot segments Wind will affect the 660 1000 foot and 1000 1320 foot segments Second gear shift variances will usually be seen at the 60 330 foot segment Throttle stop function problems will be seen between the segments of activation and de activation of the throttle stop Calculate TS Factor Function This function quickly calculates a throttle stop factor TSFactor using two runs The second run STP ET 2 must have more timer duration and must be the slower run or the function can t work You should first correct both runs to STP using the STP ET function Otherwise the two runs must have been made in exactly the same air conditions or the result will not be accurate Enter the STP ET from the first run in the field labeled STP ET 1 Then enter the timer duration that was used on that run in the field labeled TSD 1 Next enter the STP ET and timer duration from the second run and click on the Calculate button Run Completion Function Based on the information entered under your Base Run Information this function will report a projected ET on arun where you had to hit the brakes or lifted the throttle Enter the air conditions from
20. t volume if known If you know this value tap on Gasket Volume and enter it here otherwise the calculated gasket volume will be used in the final result If you enter the actual gasket volume the program will store a 0 in the value for the head gasket thickness so that only the actual gasket volume is used in the computation Tap on Back to make changes to the bore and stroke or tap on Done to end the program If you enter values that cannot be computed into a valid compression ratio the program will just report 0 Hints and Tips In bracket racing the most important factor is driver and vehicle consistency Racer s use weather computers for ET Prediction air fuel ratio management and to analyze vehicle performance When used properly the computer can help you to achieve the utmost in consistency By eliminating the variables in your car s performance it becomes easier to predict the precise dial in Being able to consistently run the number will make you a feared competitor and result in more rounds won Here are a few hints and tips to help in using your weather computer Air Fuel Ratio Management On gasoline burning engines the air fuel ratio must be about 12 5 to 1 for the computer to predict performance accurately There is no benefit from running a lean mixture When using a weather computer to predict your dial in you want the car to respond to changes in atmospheric conditions Find a day when the air density is average for th
21. ttle Stop Information The Base TS Information consists of the Index your existing Throttle Stop Factor TSFactor and Base Timer Duration Base TD The Base TD is the duration that you had in your throttle stop timer for the Base Run currently entered Tap on the button for the data field you wish to edit Tap on Cancel to abort or Store to save this data as the new Base TS Run Segment Analysis Function Other than having an on board computer calculating the STP Run Segments is the ultimate method to help a racer obtain maximum consistency and performance Enter the weather conditions from when you made your run and the interval times from your ET slip The program sees the track as six 6 separate distance segments These are the 0 60 60 330 330 660 660 1000 1000 1320 and 0 1320 distances The STP corrected time is reported for each of the above distance segments This allows you to quickly analyze what the car is doing at any point on the track Because the times are all corrected to STP standard pressure you can compare every run you make at a glance and know to the thousandth of a second any variable that exists in your combination or driving style Once your combination has been optimized you ll be able to see the variance between lanes or from track to track If you want to use this function for eighth mile racing just enter a 0 for the 1000 and 1320 ET While the uncorrected times from each run will and should va
22. when you made the run in the Enter New Air Screen Then tap on Calculate The function uses the Base 1000 time and enters it for you under Base SEG assuming that you are running on a 1 4 mile track and that you ran the car on full throttle past the 1000 cone If you lifted earlier you can enter the 660 time for the Base SE tt ere gt you are running on a 1 8th mile track you may use the 330 time for the Base SEG For the go 5 Palm ET Predictor II Segment field enter the corresponding time from your time card from the new run If you used the Base 1000 time for the Base SEG then you must enter the new 1000 time from your time card for the New SEG Tap the Calculate button and the program will compute the Projected ET or what the car would have run in those air conditions on a full pass A QUICK START FOR ET PREDICTION First you must establish a base line for performance This can be the result of one good run or an average of several runs You should calculate the Current Horsepower Correction Factor CURR HCF for each pass that you make and log it with your time slip information Calculating the STP ET for every run will also enable you to determine which run is the best regardless of the weather conditions present on the run The HCF is the Horsepower Correction Factor defined by the current weather conditions for the time of that particular run The HCF is then equal to that Elevation Barometer Temperature and
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