So I pulled 54mph http://www.youtube.com/watch?v=_obJSg2SIDU with the same setup using 6s hecell 4000mah.I'm plenty happy with the speed and torque of this motor.The temps on the motor haven't been bad ,but I went ahead and got a motor heatsink from Medusa for it.For the price I don't see how it gets better then this motor.