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No one is saying they turn their e-diff off. They're talking about disabling, at least as far as allowed, the nanny that controls cutting power to balance output based on readings of traction loss - not the e-diff that applies braking pressure in an attempt to balance power being put down to the ground effectively and avoid horrendous slippage.
In other words, Hitting the nanny button once (Turning on/off DTC) allows the wheels to spin without power being cut, and turning off DSC (holding nanny button down) basically just raises the threshold of when the sensors indicate rear braking is to be applied to attempt better distribution of traction.
As far as I'm aware, while DTC and the e diff use the same sensors to monitor power output to the rear, they aren't truly tied together. They just accomplish a goal in a similar manner, but are controlled separately. DSC, using the same sensors, attempts to just limit power to the wheels in order to control wheel spin.
I only typed that because I'm confused why the fact the E-diff isn't deactivated keeps popping up. Correct me if I'm mistaken, though, please.
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