Originally Posted by
RokleM
Gearing question.
I have a Hobbywing XERUN SCT PRO ESC along with a Gforce 4074 4-Pole Sensored Brushless Motor (1/8 Scale Racing)-2250KV.
With stock spur and 17t, the acceleration is absolutely brutally fast, but I feel like I'm topped out way to early. It feels like I could go up 3-4 teeth easy. The motor is also coming off pretty hot (haven't cut holes in the body yet to allow ventilation. So my concern is I haven't seen anyone really talking about much over 17t. Do I have a bad motor or something else whacky with this setup? Should I go bigger on pinion or down on spur (thinking down on spur)? If down on spur, any clue what will work as initial glance on tekno's site only shows 44t spurs (normal and lightened)?
I run the same ESC and the 2-Pole 2250kv sensored motor. 17t was coming off too hot. I swapped down to a 16 and got around to plugging in the programming box only to find that the ESC comes with 15 degrees timing already on. After changing the pinion and zeroing the timing, the motor is much cooler, but still a little warm for my liking. About 165ish after 10 minutes at race-pace. So, 15t pinion on the way.
If you're topping out early with a 17t, how long is the straight on your track? Ours is 120ft and I could barely achieve full speed before having to brake to turn.