let me think before answering..... scratches chin....
Point: a torsen diff will only act as an LSD if Both wheels are in contact with the ground.
Thus if you hold the pinion (or tailshaft) steady, eg car in gear, and jack up the back end. Spining one wheel will casue the other to spin in he opposite direction like an open diff.
it will even act as an open diff if you spin the tail shaft and hold one whel steady.
However if you spinf the tail shaft, and put a load on each wheel the action of he overly complex wurm gears will cause both wheels to turn in the same direction. Basically a TORSEN diff is the exact opposite of an open diff. Where an open diff sends torque to the wheel with the least traction, a TORSEN diff sends torque to the wheel with the most reaction (Up to 80%.) Thus you could be driving on the open road in a straight line with one wheel on the gravel and one on the tarmac, hit th accelerator and the actioni of the diff will casue torque to be sent to the wheel on the tarmac. No computers, not clutch packs.
It's in essence an active mechanical LSD, that's why AUDI's Quattro has been so successful, as they use a torsen centre and rear diff. It's simple, it doesn't wear out and its ver very effective as torque is always sent to the wheel with the most traction.
Probably the best thing the American's have given the automoive industry.
Cheers
Jordan
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