So i finally decided to test my bl system on my rusty, i strapped to maxamps 7.2v 4.4mah batt packs on the rusty, that's 14.4v[X(], and we clocked it before we ran out of room at 53mph, pretty sure with more room and a 76t spur and 32t pinion i can get to mid 60's, i was running 86t spur and a 23t pinion, i will try to get a video with a good speed pass., so far i love this system