I thought the stock was 2 poles, but its not even that, its 1 and Chris was testing an unreleased 100A esc. If you go the tenshock route there is sensored and sensorless, so make sure you see details. You will need to upgrade to bigger amp esc like 120a and depending on motors you pick it will need to be either sensored, sensorless, or both. With a bigger motor you'll never need 3s with those.
Btw, I forgot you asked about motor diameter. I'll try to get that later. Chris N has a few other posts about those tenshock motors, just search this forum for that motor name as I have asked him a few questions. I would love to upgrade to those motors but maybe next year.
Here you go TJ... (PAGE 204)
Originally Posted by Chris Nicastro
Im not sure of the difference between them I used the SC411 5200kv and 3500kv in testing so far. Besides color Im not sure of the specs yet but at a glance I see there is no sensor plug so it may be non-sensored vs sensored?
The 100A ESC Im using will be an update to the 80A ESC, no other word on this yet.
The only mod is to open up the motor plate slot for the shaft to allow the pinion gear to pass through.
The stock motor is a single pole. More poles (pole = magnets) the more torque the rotor will have. For the same rotor diameter if one is a 4 pole and the other is a single the 4 pole will have more torque. The 4 pole rotors cost much more to make due to complexity and materials.
The stock motor is 4200kv so for comparison I took a 3500kv SC411 and put a larger pinion gear on it. The math suggests the rear wheel RPM will be slightly higher than the stock motor and stock pinion gear for the same voltage. That means the motor has more torque to handle the same vehicle load with a larger pinion gear than stock to reach basically the same speed. So I tried the other extreme and ran the 5200kv motor to push the amp load further, no problem.
I would suggest if anyone tries this to use the motor with the sensor cable on another ESC that is sensored. The non-sensored 80A ESC we sell can handle this motor but the bottom end is not smooth, or as smooth as you would like. If you have a good sensored ESC from Tekin or LRP then it would be a better match. The 80A ESC has a harder time with the 4 pole rotor and picking up the timing but it does run it. So basically take this as a motor report update rather than a recommended set up tip.
Its like Dungey going from a 250 2 stroke to a 450. The torque is just on tap and spread further out in the power range. The stock motor has to rev up to make torque and then falls off quickly compared to the 4 pole motor. With 5200kv you have the best of both worlds, torque and RPM.