Last weekend i ran a turnigy trackstar 21.5 in my sons mini and it never broke 100 degrees. ambient was 75`. this was on high traction carpet. full timing about 40` ran for 6 min quals and mains. no metal motor plate either. and had it geared to the moon with the ride gear set and the largest pinion i had on hand 22 tooth pinion. not insane speed but pretty decent.