[Don Higgins]

I don't like to use the huge timer change to calculate ratios.

My strategy is:
2 runs, same day, same lane. 60 foot can't be more than .008 off. Must be normal cool down period, no hot lapping for this test. ( Hot lap is anything less than 55 minutes ).

Put what you think will be close in the timer for the first run, then at least 10 numbers but no more than 20 numbers different on the second ( higher if too quick, lower if too slow ).

After entering both runs Crew Chief Pro will calculate the ratio for you if it needs to change.

Predict the third run and it should be very close.

I don't like to use RPM shift on Throttle Stop classes. Some make it work but I prefer to shift on the stop, as early as possible to minimize RPM creep.