Well put a hole in the windsheild today to see if it would help. Geared 20/65 it never broke 125 in the yard after 15+mins. My pinion slipped and killed the spur so I put a 58t on it and after 10mins I checked it and it was 131. I am surprised that the 1 1/2in hole helped out so much. It was 45* out today. Apparently the e-revo body doesnt let much air in there!