@Eboosted look up any of the threads @devin had created. He has the math in there. Essentially, ESCs are constantly switching on and off. The faster you go the more on time you get. So at full speed you power is dictated by your battery, 43.2v x 40a = 1728W. At 10% of full speed you get the ESC switching on 10% of the time. This means to get the same power output than at full speed, you would need: 4.32v x 400a = 1728W. Thats where the motor limit comes in, your battery can provide the power but you’d more than likely burn your motor fast. If your motor limit is 80A then you will get:
4.32v x 80A = 345.6W from motor
43.2v x 8A = 345.5W from your battery
The torque produced is close to 1/kv * current, so you can see how the motor limit really is what matters at low speeds when talking about torque.
The issue you run into with pushing too much current is in this order:
Demagnetized motor: the component with the lowest temp rating in a motor are usually the magnets. A demagnetized motor will have a different kv value.
Magnets falling: if the epoxy holding the magnets in place gets too hot, it can fail. This is more of an issue with cheaper motors. I’ve never seen it happen.
Enamel coating on copper wires burning off: if you even get close to this point, toss the motor. Its gone. The enamel coating doesn’t burn until 300c so if your motor got this hot. You probably have a board on fire.