04-17-2009, 10:24 AM
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Banned
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Join Date: Oct 2003
Location: Yorba Linda,
CA
Cobra Make, Engine: SPF w/392CI stroker
Posts: 3,293
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Not Ranked
Quote:
Originally Posted by vector1
put a straight pipe on that is long as possible and see if you get the flutter, if yes, starting cutting off inches at a time till it quits, this would be your optimum length.
even if it doesn't flutter, you could cut to see what would happen.
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Aren't you describing the procedure for optimizing the torque curve just aft of a header collector? Old drag racing tuning trick. Not sure how lengthening or reducing the straight pipe affects harmonics? I should have paid more attention in HS physics class. 
There is definitely some level of turbulence that is causing the flap. But, again, only on deceleration and usually more prevalent below 2,000 rpm. Might be air crashing together under engine braking?
-Dean |
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