Quote:
Originally Posted by swamp2
SMG is a "manual" transmission, just controlled by a computer and pneumatics much faster and smarter than you! ZSG is a manual transmission as well. Efficiency of either is >> true automatic (which BMW would never offer in this car). I suspect efficiency of ZSG would be slightly less then SMG becuase of the basic design and having multiple gears engaged simultaneously (albeit then disengaged through 2nd clutch).
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Swamp is correct, the SMG is just as efficient in transferring power to the rear wheels as a manual, since it is a computer controlled manual transmission. Therefore, no reduction in performance.