So....im not sure what the VDC off button turns off and on, etc....but I know when i turn the VDC off, and i floor it the tires will break loose and i dont feel any systems trying to rob power or reduce wheel spin. I also have done a little drifting when it was raining with VDC off and again...no interference by any systems. I dont know what that means (whethere TC VDC or ABCD wahtever is completely off)...but when VDC is off you can have all the fun you want with no lights flashing or computers interfering...
Maybe i'm wrong, but thats just first hand experience. hope this is helpful
