[RFB]

Originally Posted by CSG Mike

an OEM Torsen LSD becomes open when one wheel loses traction or is lifted off of the ground.

The OS Giken, or similar clutch type LSD, can physically lock the rear wheels together, so that you have to either lose traction with both wheels, or you don't lose traction at all, in the rear.

This can have many effects, but the biggest ones are that it makes the rear more predictable, since it behaves the same every time, regardless of condition, and can stabilize the car further under braking (or destabilize the rear, if you choose to set the diff up that way, e.g. for drifting).

For cars set up for grip, side effects include being able to recover spins/slides from much greater angles, and making the rear much more difficult to kick out under grip circumstances. In a car set up for drift, the LSD makes the rear end sustain rotation predictably, instead of randomly hooking one tire up and causing a push.

AND - the clunking and associated weird noises with parking lot turns etc., that are very disconcerting for passengers thinking the car is breakin up -lol