[V6Jim]

Most ESC's won't allow you just to bang it into reverse and have the cars wheels spinning backwards while the car is travelling forwards. Two reasons for this. Back stick whilst travelling forwards would normally be for braking and not reversing. That is why there's a delay, or often you actually have to reverse stick twice to engage reverse.

Also, the potential for serious damage to drivetrains and electronics would result from instant reverse.

Hope this helps.

Jimmy