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Old 01-07-2013, 11:18 AM
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dunderhi dunderhi is online now
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Location: MD
 
Join Date: Dec 2006
Posts: 5,606
Mein Auto: '13 X5M, 650xi
I believe when adding valvetronic, BMW has an option to 1) tune for more power with the same efficiency or 2) tune for more efficiency with the same power. The S63Tü went with option 2 and the N63Tü went with option 1. Now there's a small detail that I haven't seen seen mentioned, in 2013 the 650 went from a 3.08 final drive ratio to a 2.81, which hurts acceleration in the name of efficiency. So in 2013, BMW went with more power and efficiency on the 650, but what I don't know is the net effect on acceleration. I know BMW claims it's faster, but I sure would love to see an independent test.
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2013 X5M ........ 2013 650xi ...... 2011 550xi (ret) 2011 335d (ret)
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