Originally Posted by heavyg123
so how do i know what size pinion and spur gear to buy to try and keep the stress on the components down but not compromising too much performance?
also can you add a heat sink to the esc to help with the cooling?
First things first....Find out if that esc can handle a 15t motor. Many rtr brushed esc's are only meant for 20,23,27 turn can motors.
You really shouldn't have to add a heatsink to the esc and with such a basic unit it's doubtful you could place one on it anyway.
As for gear ratio....if others are using the 15t, check with them and see what ratios they're using. That will help. If you're not used to doing the math for gear ratios, www.gearchart.com
The internal ratio for the Cyclone S is 2.4375. The car comes with a 96t 64p spur. 7.0-7.2 final drive ratio was pretty normal for 27t brushed motors. I never ran mod motors so maybe someone can use the basic numbers to suggest a pinion. 2.4375 internal. 96t 64p spur is factory stock.