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For ET predicting it is recommended that 5 to 6 Good Runs be entered into a 
database and that there is a span of at least 1000’ feet in DA or OA between the 
runs. 
 
Ex: Typical Data 
Run #1 1223’  10.20 
Run #2 1301’  10.204 
Run #3 1956’  10.236 
Run #4 2000’  10.237 
Run #5 2245’  10.249 
Run #6 2269’  10.25 
 
For TS predicting it is also recommended that 5 to 6 runs be entered into a database and 
that there is a span of at least 1000’ feet in DA or OA between the runs.  It is also 
recommended that there is some variance in the timer settings between the runs.  In 
other words change the timer setting for at least 3 of the runs.  The timer should be 
adjusted enough to cause up to a 0.30 second change in ET.   
Often using a run with no timer works very well.  Just enter the run with 0.0 sec for the 
timer.   
 
Good Runs:  
1. Altitude goes up, car loses performance/altitude goes down, car gains performance  
2. 60’ times consistent, no tire slip  
3. Wind effects minimal, 30 mph front or tail winds are not present 
The more Good Runs and the more altitude span the more accurate your predictions 
will be. 

******Important****** 

It often takes a number of trips to the track to acquire the above-recommended data in 
order to produce accurate results.  Because of this, we suggest using the following 
method until enough data has been acquired. 
 
Gasoline burning engines: 
A 200’ rise in DA typically yields a 0.01sec slow down in ET and vice-versa for a drop 
in DA. 

 

Alcohol burning engines: 
A 400’ rise in DA typically yields a 0.01sec slow down in ET and vice-versa for a drop 
in DA. 
 
For TS racers: 
Typically the TS ratio is 3:1.  This means is takes 0.03sec in the timer to move the car 
0.01sec.  Use this information with the above DA change to set up your timer.