OK, back on the phone to Torsen.
If a solid axle assembly has a total available traction (limited by tire traction) of X+Y with X being the light or unloaded inside wheel and Y being the loaded outside wheel then the T2R can transfer 4 times X across to Y. This is because the T2R has a torq bias ratio of 4:1.
There's a catch.... If the light wheel is unloaded and off the ground then be definition it has zero traction and therefore 0 x 4 is still 0 and no torq will be transfered. This is because the diff is limited slip with a high bias ratio but not a true locking differential.
Trick is keep traction to both wheels and the key is in roll stiffness.
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