All I know is I always turn it off if it's dry outside. I can take some slip in the rear - it communicates very well and doesn't fishtail. I can tell immediately when it starts to break loose, and usually it doesn't go very far anyhow.
Letting it break loose a little and continuing to accelerate is fine, but VDC immediately nerfs the power at even modest amounts of slip, which kills the momentum of the car. Although I suppose you could argue that's the whole point of VDC...lol..
Bottom line is unless it's rainy/snowy/icy, VDC is OFF, because it just gets in the way.
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