Quote:
Originally Posted by IMS-340MP
All true but you missed one more crucial disadvantage the X delete helps with which is the the engine having to rotate more weight (front drive shafts) which consumes some of the engine power (more drivetrain loss)
Quote:
Originally Posted by NISFAN
At higher speeds the xDrive car has two disadvantages, the additional weight of the system and the increased rolling resistance. X delete does nothing to change that.
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You might think so but no it makes zero difference whether the engine is driving the front drivetrain or the road is. The fact is all the parts will be rotating at a given road speed regardless of whether torque is being added or not. The losses will be roughly the same.
Whilst you do get an increase in losses with more power, what you gain by not sending torque through the front driveshafts ends up being added to the rear. Swings and roundabouts.