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Run 2 DA? 1020 (Enter density altitude for run #2)
Run 2 ET? 9.005 (Enter ET for run #2)
Run 3 DA? 1184 (Enter density altitude for run #3)
Run 3 ET? 9.109 (Enter ET for run #3)
.01 SEC= 17' (ET change for density altitude change ratio)
(Setup complete)
Press the SAMPLE key and allow the weather analyzer to stabilize on the = Sampled Wthr =
screen. Press DIAL-IN, select Density Altd, then 1 Car #228 to start this program.
DA Dial-In Display Example:
=Dial-In Car#228
Last DA? 1291 (Enter reference run density altitude)
Last ET? 9.112 (Enter reference run ET)
New DA? 1220 (Auto transferred new density altitude)
New ET= 9.071 (Predicted new ET - recommend subtracting 0.003
from prediction for Dial-In of 9.06)
Throttle Stop Timer Settings.
This program is designed to help super class racers predict the throttle stop timer settings for the
next run based on changes in the correction factor. The correction factor method used can be
changed from STD to SAE in the program setup area. The SAE method should produce more
consistent results for large barometric pressure changes or different track elevations. This
program requires that the T-Stop Setup function be run for each vehicle or combination so the
program can calculate an elapsed time versus throttle stop timer setting ratio. The program has
memory for 3 different data sets.
The program works for all length tracks and is compatible for use with either gasoline or methanol
fuel. However, a setup fuel choice must be made to get accurate timer predictions. The program
will automatically go to the fuel setup program during the first use. The setup function must be
redone if you change anything that affects vehicle performance.
The timer setting is predicted from 2 previous runs that are entered into the computer memory
during the T-Stop Setup program and a recent reference run. The reference run, on which the
prediction is based, is selected by the user. The reference run should be the most recent good
full run when the vehicle performed as expected. Runs that had tire spin, unusual 60 ft times, or
gusty wind conditions should not be used as the setup runs or the reference run. Change the run
used as the reference (old) run as the race day progresses. It is important to use the most recent
good full run as the reference. The most recent run will best represent the current traction and
weather conditions.
The throttle stop program works best when the engine fuel/air mixture is slightly rich so the vehicle
performance will change appropriately with the weather changes. This may require periodic jet
changes during the race season. The benefits gained in consistency and predictability are well
worth the effort. If the vehicle runs quicker than the computer is predicting when the correction
factor is improving (number getting smaller) then the fuel/air mixture is probably too rich and
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