[Gustav]

I can't really comment on the low turn 1920s on low cell counts,mine is a 10 turn on higher voltage so i just figured that the 5 turn would work well with 6 cells but apparently not.I use mine with a 18.97 on 3s most of the time and i can 't really get any heat out of the motor or controller.

Thunderbruiser,it depends what you're looking for,i don't think a system that's faster than the 4.5 on 6 cells but also does runtime and not just pure speed really exists,two different things really on only 6 cells.If runtime is what you want then maybe a slower turning motor like a basic5300 or a 1920/6.Some more voltage would achieve both easily though.