Originally Posted by YmeBP

I use a 48/114 but i'm a touch under geared for my track, i've attached a spreadsheet that gives you the ratio w/ the 2 different pulley combo's (same sized pulleys). Others at my track use 54/108 but i can't control my throttle finger enough to keep motor temps down.

But it really depends on your track and other variables, good example i had my dual rate up WAAAY too high so it was causing the car to work harder to get through the turns raising up my motor temps, i lowered my dual rate, i can still get through the corners, and my temps came down 30 degrees allowing me to gear up.