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Originally Posted by -Wingman-
Can't say anything helpful other than on number 3. You can thank the small single twinscroll turbo for that one. The turbo's efficiency basically dies past 5k Rpms, and you're actually losing boost pressure at that point.
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Always the bashing on BMW...
Did you guys ever think about the concept of the N55? BMW mounted a small turbo because they wanted a lag-free response of the engine! They have a max torque curve starting at 1200 RPM and ending past 5000 RPM. That is the RPM you would normally use in a daily drive base...
They did NOT design the engine to be tuned past 400 hp and they did NOT design it for people driving it like bogus...
They really did an excellent job on the engine and they need respect for this!!!