Hi Steve,
Are you running 5 cell or 6 cell?
That gearing for the 4.5 seems a little high unless you're on a pretty large track.
With a 4.5 with the 12.3 mm rotor on 6 cells I generally would gear around a 9.4
With the 13.0 mm rotor on 6 cells I would gear around an 8.5.
If you run 5 cell you're going to have to gear up another two teeth from those starting gearings.
Also there were some gtb's that had "overly sensitive" temperature shut down a while back... it's possible that you and your friends have these older GTBs... if you send them in to me I can check them out and get them upgraded to the latest software version that doesn't have this temperature shut down problem.
Originally Posted by
xraysteve
i have been geared every where. i have the older gtb. it is a year year and a half old. there were three of us that bought them at the same time and none of us could get them to run the 3.5.
my 4.5 is geared at 22pinion and 116 spur with a 1.7 internal.