I actually read the whole thread. Ufff
Amazingly no one gave simple physical explenation why eLsd is losing more energy.
It is related to that the eLSD controls slip "to frame" whereas LSD does this to the other axle.
Energy dissipated = torque x slip.
And since there is greater slip between the axle and frame instead of between two axles, the energy dissipation in eLsd is greater.
This is why brakes will heat up more than lsd.
Also, I wonder if anyone knows, how different characteristics of the brake pads influence the eLsd ?
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