Motor stuttering at full throttle

Hi,

I'm new to VESC products, but used other FOC controllers such as ASI, Nucular and others.

I have seen this issue on 2 EV's running at 82v. I doubt the voltage matters.

One setup has a Revolt RV-160Sh outrunner and a Trampa 100v/250a controller. The motor will go through set up and under no load runs perfectly. Put the chain on and try to ride and the motor at any speed will stutter if I crank the throttle to WOT. As a result, I have to start off gently and slowly work up to full speed. I can never accelerate at full motor power without stuttering. I am using torque throttle.

This setup is more complex. It is 2 100v/250a Trampa controllers running a 6 phase hub motor. On this motor, with the back wheel off the ground, I can get it to stutter from zero RPM if I crank the throttle. Easing into the throttle from a dead stop and the EV takes off OK. Riding along at 30 or 60 or whatever speed, crank the throttle and the motor will stutter. All I have to do is back off the throttle some and the stuttering stops.

What's going on here with these EV's? Why does cranking the throttle make the motors stutter? Why if throttle is eased into, do the motors run fine?