This is a truly fantastic motor. I have been thrilled by this bargain. This is one of the cheapest 17.5T brushless motors on the market, yet it is very fast. The adjustable timing is brilliant and had made my rc car a beast! I have been runing this motor with an FDR of 4.8 and the motor barely gets warm after a full 10mins of drifting(30T pinion and 80T spur). With a heatsink the motor could easily reach an FDR of 4 and I have read of people running this motor at 3.5-3.2 FDR at 170'F.