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Old 01-07-2013, 11:18 AM
dunderhi's Avatar
dunderhi dunderhi is offline
Next car: '18 AMG GT Vert
Location: MD
Join Date: Dec 2006
Posts: 6,253
Mein Auto: 13 X5M, 15 M6, 15 328dxt
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 S63T went with option 2 and the N63T 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.

2015 M6 Drophead Coup
2015 328xd Estate
2013 X5M Sport Utility Vehicle
2013 650xi 2 Door Fastback Saloon (ret)
2011 Dinan 5 Saloon (ret)
2011 335d Saloon (ret)

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