Quote:
Originally Posted by mkoesel
Makes me wonder how much power the car would make at 9000 RPM with the stock ECU. I wonder if the block and mains could take 9000 RPM if the rotating assembly and other things that run off the crank could also take their respecive higher RPMs?
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I'd personally worry more about valve float, but in any event, BMW thinks that anything more than 8400 will reduce engine life.
The engine wouldn't make any more power if revved to 9000 rpm (since the power peak is at 8300), but the car would be quicker because you'd be making more average power over any given distance.
As an example, making the one-two shift at 8400 rpm gets you back to about 5000, where at a guess it's making around 275 HP, losing close to 140 ponies. If you shift at 9000, you're probably off peak for a short time to the tune of around, say, a 10 HP average over that 600 rpm. However, after the shift you're at around 5350 rpm, where you're making just under 295 HP.
Therefore, you'll pull a fair bit harder after the shift at 9000. Lose a little early, win bigger over a longer period later - gear by gear.
Bruce
PS - I know you know this stuff, but others in this forum appear to not have the concepts clear. Therefore the explanatory verbiage.