Hi,
I think you are talking about a traction control.
I have never used it, it is better to first learn how to drive the car
without any help of devices like this, so you know how the car drives and
handles without 'help'.
It is most likely illegal in most races also, so if you want to race check
the rules before you buy it!
> Do you know about anti traction systems for RC cars and do what do you
> think about it's appropriateness?
>
> Dmitry.