Hey Scr8p,
Novak's gearing suggestion tables are just starting points, they say if the motor gets too hot, to drop one or two teeth to get the temps down. At the same time, if the motor is still cool you can gear them higher to get better top end speeds.
My main concern is whether I can fit the 30-31 pinion in there with the 84 spur.
If you want to stay competitive with a 17.5, you have got to gear the heck out of them.
For example, I ran my XX with the CO27, with the 88/19 gearing, and it was borderline hot.
A brushless with the same gearing would be very very slow, I would have to use a 88/32 gearing to match the speed of the brushed stock motor, and still I think the brushed motor would be a bit faster. To gain an edge on the brushed stock motors, people just gear them(brushless) as high as possible without over heating them.
The problem lies in the size of the spur and the size of the pinion, the larger the spur, the larger the pinion has to be to get that gearing low enough to make a difference in performance with the 17.5.
I don't know If all this bable talk made any sense, I apologize for that
![Rolling Eyes :roll:](./images/smilies/icon_rolleyes.gif)
Life is like a box of chocolate, you never know what R/C car you're gonna get next!!!