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should be leaned slightly. Conversely, if the vehicle will not run as quick as the computer is
predicting when the correction factor is improving then the fuel/air mixture is probably too lean
and should be richened slightly. Efforts spent on getting the fuel/air mixture correct will be well
worth the rewards in increased predictability. See the Tune-Up Information section for more
details.
T-STOP SETUP. Most current throttle stop systems utilize two timers in the same unit. Typically,
the first timer allows the throttle to remain wide open for some period of time and the second timer
controls the throttle closed time. This program assumes that, once adjusted, the first timer setting
will remain constant. Any time the first timer setting is changed, this setup procedure must be
repeated. The program also assumes that the more time put into the second timer, the slower the
car will run (higher elapsed time).
The program needs data from 2 runs to calculate the relationship between the second timer
setting and elapsed time. The setup runs should be made on the same day, preferably in the
same lane so that the traction conditions will be similar. Make sure the 60 foot times are within
0.01 seconds of each other. Make 1 of these runs with a timer setting that will allow the vehicle to
run approximately 0.1 seconds faster than the target index. The other run should be made with a
timer setting that will cause the vehicle to run approximately 0.1 seconds slower than the target
index. It is likely that several runs will need to made, in order to get 2 good runs for the setup.
Record the run data for all the runs, including the correction factor and the timer setting. Then
select the 2 runs that more closely represent the setup criteria.
The setup procedure may be run as often as desired or whenever the accuracy of the program is
not up to par. The entire setup routine must be repeated for each vehicle or combination.
Important: When a change is made to the first timer setting or any change is made that might
affect vehicle performance, the setup procedure should be performed again to assure accuracy.
Remember, the T-Stop program predictions can only be as good as the information put into the
setup.
Press T-STOP, select T-Stop Setup then select 1 Car #0 to start this program.
Setup Display Example:
==T-Stop Setup==
Fuel = Methanol (Press down arrow to change fuel, then ENTER)
Car#? 228 (Enter car or combination ID number)
Run #1… (ENTER to go to next line)
…Corr? 0.9875 (Enter correction factor for run #1)
…ET? 8.861 (Enter ET for run #1)
…Timer? 1.190 (Enter timer setting seconds for run #1)
Run #2… (ENTER to go to next line)
…Corr? 0.9882 (Enter correction factor for run #2)
…ET? 9.109 (Enter ET for run #2)
…Timer? 1.770 (Enter timer setting seconds for run #2)
.01 ET= 0.0234 (ET change for timer change ratio)
(Setup complete)
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