Originally Posted by Steve Weiss
I would say start out around 4.2-4.5 with the 13.5
For the 17.5 I'd say start around 3.5-3.8 and go from there.
We have been all around on the gearing with the 17.5 and keep striking out. We started out with 4.0 and the temps seemed fine. Went to 3.9 and it didn't make 5 minutes. It seems that the motor got to 160 degrees and just quit. The temps on the GTB were running cooler than the motor. We never had any issues with the 13.5.
Last week we were geared anywhere from 3.5 to 3.8 and couldn't make 5 minutes.
This is in touring car with rubber tires.