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Originally Posted by mkoesel
That is vastly oversimplifying the issue. In fact, the dependencies are many and the technical challenges are complex, but the fact of the matter is that it is physically possible to build a high revving turbocharged engine that makes peak power at the top end of the rev band.
It may be true that if you or I started with an off-the-shelf N55 and began swapping turbos and playing with the ECU, we are unable get max power at ~7900 RPM. But then that isn't what BMW is going to do. None of us know just what is in store for the S55 yet. All we know is there will be multiple turbochargers.
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Agreed, like I said before. I think we are going to see something new. Possibly something along the lines of an electric assist to defeat lag in conjunction with a turbo sized for top end breathing....