Originally Posted by Solara

I used 4.8 final drive with the original or novak type 13.5 motor on a 40x100 footer track...not a problem, with very good speed.

Here is the thing you need to try.....your 7.7 final is WAY OFF...try 4.8 with your motor timing (the timing on your phyical motor) set to the middle...then keep gearing up untill you like the speed. I know the V3 13.5 ran alot cooler then any other 13.5 so gearing up is not a problem.

But if your track is REALLY tight (you never say how small is your track...) gearing up does not makes your any faster...you need punch and corner speeds....