I agree with the last few posts. I run a 1850kv nue and get awesome runtime, temps and plenty fast enough. I ran a 43+ min race with nitros a few weeks ago with only two 20C 5000mah turnigy batts. if you stay with a milder setup like this you will not need Crating above 20C my batts come off track after 20+ min runs at 105F max. If you go to 5S on the 1700-1900kv range motors you get even better runtime AND speed. the 1800ish kv range i think is the perfect motor.