Mechanical LSD is the safest and quietest type of LSD. It is not bad, but there exists better.
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Torsen, which stands for torsion-sensing, LSD's use gears and typically provide more like 75% coupling. The MRT Torsen style front LSD locks under load so provides more grip when exiting a corner, but acts like an open diff under trailing throttle so it does not induce understeer coming into the corner. This is the major difference with a mechanical LSD. Most rally and full race cars use clutch pack diffs as a Torsen LSD is unable to transfer torque if there is none, ie if the wheel is off the ground it will not work, a clutch diff will. A Modena Torsen LSD is a non-adjustable unit that in theory transfers torque from a spinning wheel to the other wheel before it spins.
Point to consider - a torsen LSD, has silent operation and is ideal for street use.
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