545i Stock Exhaust - Mod
10-22-2009, 10:50 AM
#11
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Originally Posted by turboawd' post='1038332' date='Oct 22 2009, 11:46 AM
whats the flap for anyways? is it to create more backpressure, at lower engine speed, for more torque?
10-22-2009, 10:51 AM
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Originally Posted by turboawd' post='1038332' date='Oct 22 2009, 02:46 PM
whats the flap for anyways? is it to create more backpressure, at lower engine speed, for more torque?
10-22-2009, 10:53 AM
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Originally Posted by 545felix' post='1038344' date='Oct 22 2009, 11:51 AM
not really, just for noise control. it opens at really low rpm if you floor it (<1500rpm), so it really doesn't do anything for torque.
10-22-2009, 11:00 AM
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Originally Posted by Rizbel' post='1038349' date='Oct 22 2009, 02:53 PM
So just to reduce noise at idle RPM.
10-22-2009, 11:01 AM
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Originally Posted by 545felix' post='1038344' date='Oct 22 2009, 01:51 PM
not really, just for noise control. it opens at really low rpm if you floor it (<1500rpm), so it really doesn't do anything for torque.
10-22-2009, 11:41 AM
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Originally Posted by turboawd' post='1038362' date='Oct 22 2009, 03:01 PM
is that just your guess?
10-22-2009, 11:44 AM
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Originally Posted by 545felix' post='1038400' date='Oct 22 2009, 02:41 PM
no, mine was squeaky, so I could hear it open in parking decks, etc. it opened the second i hit the gas hard in 2nd and I could hear it close when I lifted off the pedal.
10-22-2009, 12:02 PM
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Originally Posted by turboawd' post='1038403' date='Oct 22 2009, 03:44 PM
no, i meant is your reasoning just a guess? why its there? not when it opens. obviously it will make more sound when opened.
the open and close thresholds might be different on the 6 cylinder cars. it may well affect torque on the smaller motors. I don't know because I've not driven a 6 cyl E60 long enough to make that observation. the OP has a 545, or at least it appears so from the topic title, so I can confirm my experience there.
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