Originally Posted by thefnshow
hey guys, i need some help...i ordered the 3racing high speed gear set which should be in tomorrow and i need a starting pinion gear choice...i'm running a 21.5 and i know you guys run 17.5...what would be a good starting point ?....i have hpi metric pinions from 28-35 coming in...thanks for any suggestions
I think a good place to start will be the shortest ratio and then progressively go up in pinion sizes to see what's the fastest lap around your local track. I've done this and quickly found that the final drive that suits me best is 3.92, which I get off using a 28T pinion and 35T spur from the fast gear set. Remember to temp your motor after a few minutes when using larger pinions just so you don't toast it.
This is the process I use when testing at a different track. Remember that the tallest final drive which will give you the fastest straight line speed does not necessarily give you the quickest lap. Keep testing and timing and soon you'll know what works best