If the15/66 worked out you need to get close to that. which is a 4.4 to 1. it will take a 11-12 tooth with the 51 tooth.

I never tested it enough with the 32p gears to get a good ratio for them either, I was always blowing out spurs not even 1/2 into the run.

I realized that when I did these tests, that I have yet to put any fans on both the controller and motor, so that should significantly change the temps.....or make it at least a little cooler. To make room for the fans, I'm also going to move the controller to the top of the diff mount hold down thingy, and make a hole in the windsheild to give it some "ram-air" effect.

I think I also want to rework the battery trays though, I did a crapola job to begin with, and they've kinda gotten worse with every run.....I need something new for sure.