Quote:
Originally Posted by Remonster
Of course it's possible to have a redline that high, but the 458's engine (whatever it's called) and the BMW S65 are naturally aspirated engines. With a turbo motor, increasing the redline means using a larger turbo which would mean increased lag. The principle reason (well, one of them main reasons) the N54 and N55 lose a lot of power above 6,000RPM is the small size of their turbos which was done on purpose to give them very quick spool times. An M motor needs to have very good throttle response so they are not going to want to strap large turbos on it, 7,500RPM is doable but don't be surprised if they keep the redline lower to really focus on responsiveness.
It's not just turbo size that has to increase, either, the intake manifold would also need to grow larger to support the increased airflow which would also negatively impact spool time.
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Good points for sure. The piston speed of the 8500 rpm redline McLaren MP4-12C drops to 65 feet/s due to its fairly short stroke. It seems the electric turbo might be the answer to a large enough turbo to support high rpms and maintaining good throttle response.