Originally Posted by ddzc
I have a factory tc4 running the stock 72T 48 pitch spur. Just wondering, what type of pinion gear do I need for this setup with a 6 turn motor to achieve max speed?
The type of pinion you will need is a 48P. Many brands will work, but I prefer Robinson.
If you are asking what size of pinion to use Associated reccomends a 19 tooth pinion for an 8 turn motor. This would be a good place to start.
The maximum size pinion you can fit into a TC4 without any modifications is a 32 tooth. You will need to watch the motor temperature as you gear up. The higher you gear the car the higher the temps will be.
Other things that will affect what size pinion to use will be the use of the TC4 (e.g. oval, onroad, parking lot, size of track,etc.).