Quote:
Originally Posted by Remonster
Think about it, with a turbocharger you can't have both low end power and big top end power. You either have a small turbo that spins up quickly but runs out of breath when the engine is forcing exhaust gasses into it at 6 or 7 thousand revs or you have a big turbo that takes a long time to spool up, can't provide much low end power but starts to hit its stride at high RPMs. Do you really want an M car to drive like a big turbo Supra or RSX?
The reason it doesn't rev higher than 7,000 is because it doesn't need to, a turbocharged engine is designed to be used mainly in its midrange, in fact there are almost no turbo engines I can think of that need to be taken to their redline to offer maximum performance.
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Another way to get around this is to use a variable vane (geometry) turbo like the Porsche 997 Turbo does.