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      07-25-2009, 04:04 AM   #9
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United Kingdom

Drives: 2017 M4 CP DCT
Join Date: Mar 2009
Location: UK

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The Eurocars efficient dynamics system should make a difference, IIUC the USA spec cars don't have it. The system disconnects the alternator when the throttle is open and reconnects on closed throttle/braking, subject to the battery having sufficient charge. I guess the effect is something similar to the underdrive pully but more so. I've read it could be worth a significant number of BHP at high rpm WOT but can't find a source.