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there's no slippage if the front and rear driveshafts are rotating at the same speed.
which is why BMW is adamant about tire circumferences being less than 1% different.
it's a wet plate clutch system, it's designed to slip without damage.
so you apply pressure, if the the wheel speed is different between front/rear the system is already preset to transfer toruq to the front axle. The DSC then varies the clutch pressure to vary the torque split based on wheel speed inputs.
It is not binary, it definitely has more than off and on.
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