Quote:
Originally Posted by rchippie
As the title says . I was running a novak xbr esc with a ex 13.5 & trak power lipo's . My car is a tc4. I was running a 31/66 or 5.3 gear ratio for the first race . The temps were 175 at thermal . the second race i ran a 33/66 or 5.0 gear ratio the temps stayed the same & has a stutter at slow speed . So i tried a 29/66 or 5.8 ratio during practice the motor got hot quick & had a stutter at slow speed . The car had a stutter untill it got up to speed then it went away . But it came back when i slowed down to turn . I just took the motor apart the rotor still seems to be magnitized as it picks up the screws that hold the motor together with no problems . I switched to my speed passion 17.5r after & had no problems . So i know it's not the esc .
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You demagnetized the rotor. Even though it still has some magnetism, it'll make your motor hot as it needs more current now to turn the rotor. I have a lot of demagnetized rotors that I sometime use to magnetize some tools I use. You I used the 31/69 combo to hit 65mph in my TC3 which has the same diff ratio? With the 17.5r you have no problem and you should be able to use the bigger pinions as the 17.5r will needs it to be fast.Keep in mind if your ESC shut down because the motor got too hot, then the rotor probably went above the 175-180F mark. Most temps taken from outside the can will not tell you how the temps were inside. Open your 13.5 and check the magnet wires to see if they look ok and if they do just buy a new rotor and don't use such a big pinion or small spur.