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      01-17-2013, 01:44 AM   #9
Mike Benvo
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Drives: Harrop SC M3 / E46 M3 / 7Turbo
Join Date: Apr 2008
Location: SoCal

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2008 BMW M3  [5.00]
1990 BMW 735i Turbo  [5.00]
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Quote:
Originally Posted by Longboarder View Post
Would you go higher than 8,800 Mike on the N/A motor? Just curious as instead of doing a low compression build ESS VT3 like Drew or IMG, I'm contemplating doing a build to allow for the motor to rev beyond 9,000 RPM with the blower. Would only make sense if it's (significantly) less costly than a $30K+ low compression build.
The motor is probably strong enough for it. But you would probably have to change camshafts / remap vanos to really take advantage of it up there. I've seen frezeframe data as high as 9,114 RPM and the motor still runs 20K miles later. Another member here said that his hit 12K and he only needed to replace one valve spring.

Bottom end stress is going to significantly increase at higher RPM. With a boosted setup without cams it might not be the best bang for the buck @ high RPM. I had to have custom cams made by Schrick for my S/C 330 to address valve overlap. It made a huge difference but wasn't set up for a high RPM setup. Then of course other things come into play - head flow, etc.. BMRLVR on the forum might have more insight on this.
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