^He is right, I did it solely for grip events as the EBD kept on kicking in and eating away my rear pads, Reality can assure you how badly they ate the rear pads. But disconnecting VDC also disables Back-Up VDC (Yaw sensor), EBD, and TCS. Pushing the switch only disables primary VDC and TCS. You can still drift and whatnot, if you are going to run more than 3% size difference in winter tires, then turn VDC off everytime you get in the car and learn how to control fishtailing/drifting.
I’ve been find without VDC and I’m still on summer tires. (Yes i’m crazy for driving summer tires on snow).
215/60/16 here IIRC… leaving VDC on when running more than 3% makes the VDC kick in more often than usual… even when you are not slipping especially during corners as tire rotation speeds are different, the computer thinks you’re sliding. It’ll cut engine power by 30% IIRC and brake all 4 wheels individually causing uneven pad wear. Hence why my rear pads got ate away so fast.