Mercedes-Benz M-Class 4ETS system

MB's claim, 4 ETS would stop spinning wheels and
direct all available torque (up to 100%) to the wheel(s) with traction, does not hit the nail on the head.

Here is how it works:

 
Due to 4 ETS intervention, after a brief moment of traction loss, spinning wheels are slowed down

and the differentials will again distribute a higher amount of torque to all four wheels.

 see detailed description


If only one wheel has traction it receives 25% of the available torque.

75% of the torque is transformed into heat.


If two wheels have traction, they receive 50% of the available torque. 

50% of the torque is transformed into heat.

 
If three wheels have traction, they receive 75% of the available torque. 

25% of the torque is transformed into heat.

more about traction loss and 4ETS

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