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10-06-2016, 11:18 PM | #1 |
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Exhaust tips protrude more when hot?
My aftermarket exhaust tips always extend about 1/2 an inch further out after a drive. Can someone please help explain why this is happening? Looking at how the x-pipe/resonator is mounted, that portion of the mount shouldn't flex or move? So, I don't understand how the entire mufflers section can just extend out that much more horizontally when heated - where is the movement/expansion coming from? I don't remember seeing this with the OE exhaust, but every aftermarket exhausts that I've owned had done this (Supersprint Race, Remus Sports, and now Eisenmann Sports). Does anyone have a theory on this? Thanks.
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10-07-2016, 05:02 AM | #2 |
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heat expansion.... every higher performance car I've had has done this.... the z4m does it to the extreme however they really grow after a blast.
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10-07-2016, 10:15 AM | #3 |
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Same here. I have an RPI cat back and the tips after a ride heat up and elongate outward. No big deal. It's the male enhancer...no Viagra needed.
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10-07-2016, 03:50 PM | #4 |
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I know this isn't a big deal, but was just curious to know where the expansion would be coming from. I haven't owned any other cars that had done this.
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10-07-2016, 03:56 PM | #5 |
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My guess is it comes from the entire run.
Can't imagine that any reasonable percentage growth would gain nearly an inch unless it was a percentage of the entire 8' or so run. Sure is noticeable, and pretty freaky.
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10-07-2016, 05:06 PM | #6 |
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The other reason is a Z4m gets happy when driven.
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10-07-2016, 06:07 PM | #7 | |
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10-09-2016, 09:12 PM | #9 | |
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I haven't noted this on my 3.0si, but I'm going to check it out next track day....
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10-10-2016, 10:13 AM | #11 |
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10-10-2016, 03:45 PM | #12 |
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Yep, me too. The RE cans whistle under WOT when cold; almost sounds like a leak.
When hot the whistle turns into rasp, and they get a lot louder.
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10-19-2016, 09:20 AM | #13 |
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Never noticed it until reading this, but my RPI cans do it too and they're the only exhaust mod I have
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10-20-2016, 01:32 PM | #14 |
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some cars have a braided flex joint at the manifold connection which helps alleviate this.
Since ours is a hard connection we get the linear expansion pushing the tips out.
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