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Old 06-18-2010, 01:22 PM   #1
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Default Exhaust noise is driving me crazy...

Got an 01 with a vfr supercharger on it. The exhaust on it appears to be the stock exhaust up to the cat. After that there is a resonator welded in, then borla dual exhaust. The cars a bit loud which I can live with. But at higher rpm, 4k+ there is a rattling noise.

I have looked around the exhaust and cant find anything loose or badly fitted. Its a very fast rattling noise so I dont think its metal hitting metal. I read somewhere else that getting rid of the cat will help reduce this rattling (no inspections here).

Ideas?
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Old 06-18-2010, 02:10 PM   #2
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detonation..
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Old 06-18-2010, 02:33 PM   #3
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Have someone else drive it while you're in the passenger seat. Move around and see if you can figure out exactly where the noise is coming from. With the top down, something making noise in the front can sound like it's coming from the back, so it helps to be able to move around and find the source.
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Old 06-18-2010, 02:57 PM   #4
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It sounds pretty close to this around the :20 mark

http://www.youtube.com/watch?v=V8w-AB6bfl8
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Old 06-18-2010, 03:10 PM   #5
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grab an exhaust tip

shake mildly violently

does it hit anything?

grab other exhaust tip

repeat
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Old 06-18-2010, 04:16 PM   #6
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Mine was rattling around, a coat hanger later solved such a problem.
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Old 06-18-2010, 04:26 PM   #7
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Depending on what you have under there it could just be a heat shield that is coming loose, or the exhaust could be hitting somewhere.

Just jack the car up, crawl under it, and figure it out. Cant be all that hard.
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Old 06-18-2010, 09:09 PM   #8
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heatshield rattling?
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Old 06-18-2010, 09:39 PM   #9
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1. Rubber mallet
2. Hit exhaust muchly
3. ?????
4. PROFIT!
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Old 06-19-2010, 01:24 AM   #10
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Just remove it all and run open header. Problem solved.
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Old 06-19-2010, 01:28 AM   #11
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Quote:
Originally Posted by kjoudrey View Post
Have someone else drive it while you're in the passenger seat. Move around and see if you can figure out exactly where the noise is coming from. With the top down, something making noise in the front can sound like it's coming from the back, so it helps to be able to move around and find the source.
stupid advice.


as for your question OP, the others are right: move the exhaust with your hand from the rear. the rubber bushings allow for enough movement for you to be able to tell if its hitting anything.

next check heat shield bolts/etc.



if all else fails get rid of that POS and go TURBO
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Old 06-19-2010, 01:49 PM   #12
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hear a rattle? turn up your radio.
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Old 06-19-2010, 04:23 PM   #13
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Mine rattles from 3500-4000 but that's because the welds have broken on both sides of the resonator.
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Old 06-19-2010, 06:06 PM   #14
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Quote:
Originally Posted by Oscar View Post
detonation..
This ^^
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Old 06-19-2010, 09:39 PM   #15
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Quote:
Originally Posted by eastZ14miata View Post
hear a rattle? turn up your radio.
Better advice has never been given on this forum.
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