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B21F Sachs clutch 'horsepowerability'... 200 1979

posted by  dlot on  Mon Feb 3 12:07 CST 2003
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last visit: Sat Nov 17 13:53 CST 2001
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Hi Pierre,
That''s great! Nice to have choices isn't it? I'm about to comment on an issue here that in my experience is totally misunderstood. You are making a normally aspirated performance motor. You will need rpms to make lots of hp. However, in my real world experience with turbo motors the boost response is better with a heavy flywheel. Look at it this way. A turbo is load sensitive. In order to make boost the engine must get a load it and increase the exhaust gas velocity.
A heavier flywheel will load the motor sooner so it makes boost sooner. The heavier flywheel will cause the motor to rev slower and probably take away a few top end rpms. The motor will have a stronger low and midrange boost response. I have two turbos. A 82 with the flat flywheel and a factory intercooled car with the heavy flywheel and clutch. The mid range and low range response is much better in the 84. Anyway for your performance application you probably want the lighter flywheel since you want high rpm performance and want to get there soon. Wish you well.

Dave 82 242ti






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