Originally Posted by bertrandsv87
A tc3 with a 17t motor should start gearing around 6.666fdr(72t spur/27t pinion), if the tranny is free and the motor tuned right !
Epowered : look for the TC3 manual on the Associated website. It's all explained there. Your 17 turn is very likely burnt.
The formula to get your fdr : ( spur/pinion) x Internal ratio
In the case of the TC3 you get :
(72/27) x 2.5 = 6,66
The higher the number you get, the easier it will be for your motor to make the car move, but the less top speed you'll have. You'll have to find the best compromise.