Originally Posted by
hobbizone
Im using aftermarket BL at 4800kv but its just that the esc is not programmable. Im putting it at my rs4 with stock chasis however, when throttling the car goes donut. Why is that so??? Anybody can assist me here

first off
how is the car mechanically....do the wheels spin freely? is the steering centered? if you roll the car on the floor does it track straight? Is your steering is centered?
your new esc is the power linear? or is it like off-on....
if you pin the throttle very fast the car can donut.....
Let us know what you find.....