Originally Posted by
C_alan
Anyone else running two fans to keep the motor from overheating? The motor is a brand new R1 13.5 with 40d of timing with a 78/23 grearing. Im running a tight indoor track, with high grip clay. ESC did a thermal shutdown due to motor temp hitting 170 before I added the extra fan and dropped a tooth on the spur.
78 / 23 * 2.5 = 8.47 final drive ratio
That seems way too high. I'm at 78 / 28 * 2.5 = 6.96 on a 13.5T Reedy S plus and it gets hot enough even in 70 degree weather but it hasn't overheated even in 15+ minute practice rubs.
The other poster is at 7.2 (72/25) and 7.22 (78/27). I think that would be fine for mine if I didn't run it past 10-12 minutes. If I was optimizing for < 10 minutes maybe 7.5 (78/26).
Just googling a bit and 7-7.5 seems a common FDR for 4wd 13.5: buggy.