I talked to Damon Wang (QS Motor) and he said that Kelly Controls will be the most powerful controller. But you are right, 650A is better for accelleration than 600A. QS Motor recommend me two different controllers: kls14401-8080ips24v-144v400a sinusoidal or sevcon Gen4 size6. But I have never heared from ATP controller! There's only one controller on the market which will match the motor more in my point of view. That's controller is EMSISO emDrive 500 (up to 100kW peak power, 120V, 800A, field weakening option) but this controller needs water cooling and the price is 1895€. That's the reason I decided me for KHB14601C and I also get a good price.
But let's see what happens on 1/4 mile.
But let's see what happens on 1/4 mile.