An active diff works just like a traditional limited slip diff, except it's proactive in a sense rather than reactive. For instance, the current M Diff needs to sense slippage before it adjust the torque split between the two halfshafts, whereas an active diff will consider the steering input, yaw rate, vehicle speed, individual wheel speed, etc to proactively adjust the torque split in anticipation of what what the car will be doing. It's exactly what Ferrari's eDiff does. Same thing basically.
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