BSR use Sevcon controllers for the 25kw.
A dyno would have definitely helped, but the ability to go from lab to track to lab is extremely important. Yes, dyno numbers are important, but it doesnt always show functionality in the real world. Yes, my previous setup made some power, but illegally (too much battery weight) and with issues (throttle cut out requiring power cycle, over temp with any significant running). BSR not only has the drivability smooth, but you can race it on the limit FOR THE ENTIRE RACE. I would call this “fully sorted.”
Ive considered selling the other motor and controller, but that kart is literally a set of brackets away from being another BSR kart, and already having those as test parts/spares is invaluable.