Quote:
Originally Posted by solstice
Two reasons.
1. Cost savings
2. Emissions ( not really mpg, turbo engines aren't all that frugal that many seem to think. )
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^This
An S65B44 with DI could have comfortably made 460~480ps. The engine would have likely weighed slightly less than the S55. This would have made fantastic F8X M3s and M4s that would have outperformed the cars with the S55 (better acceleration, better throttle response and better sound). DI would have improved emissions slightly but not sufficiently enough to meet European legislation corporate targets. The cost of the engine would have also likely been prohibitive. As stated, IMO, BMW went with the S55 for two reasons: cost and emissions.