I assume this is for the Savage in your sig? If so, a 1515 size minimum, unless you are using the 2/3 speed tranny. For 4s, anything with a kv around 2200 +/- 500kv work fine.
I'm using the 2 speed tranny...my 9xl gets too hot like 190 so im thinking of going for a neu...maybe I'll wait for the castle motors and see how they are...my main thing is havng a motor that will never get too hot on any surface..if I lose some power to get that reliability I'll be ok with that.
well now I'm stumped between the two LOL. Maybe I'll wait for the castle neu...I really have no idea. I'm leaning a little toward the 2d right now as it may run cooler...and for my driving the 9xl is fast enough I just can't stand the temp problems anymore...does anyone know yet what neu motors the castle ones will be equivelant to?