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      11-30-2011, 08:59 PM   #23
bruce.augenstein@comcast.
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Originally Posted by Mahmood07 View Post
I don't get it. Are you saying my engine is going to blow up if I shift at 8600 rpm?
No. I'm saying you would be quickest if you shifted up near 9000 rpm - but it would be very risky to do that over time.

At a guess, 8600 is pretty safe.
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      11-30-2011, 09:05 PM   #24
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I don't get it. Are you saying my engine is going to blow up if I shift at 8600 rpm?
No. I'm saying you would be quickest if you shifted up near 9000 rpm - but it would be very risky to do that over time.

At a guess, 8600 is pretty safe.
Ya, the ess tune only increases it to 8600 rpm which is nice to have at high speeds
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      12-01-2011, 09:45 AM   #25
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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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      12-01-2011, 12:59 PM   #26
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Originally Posted by mkoesel View Post
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?
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.
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      12-01-2011, 01:46 PM   #27
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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.
True. But I think you could address it with stiffer valve springs (theoretically anyway).

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The engine wouldn't make any more power if revved to 9000 rpm (since the power peak is at 8300)
Good point. I forgot about that - for some reason I was thinking about it from the point of view that the power curve was still climbing even at 8400. So, instead of the stock ECU, you'd have to reprogram to take advantage of the higher RPM, assuming it would even be worthwhile without a new intake.
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