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03-25-2014, 09:25 AM | #1 |
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Exhaust Rattle
I recently started to notice an annoying rattle when the engine is under load which starts at a little under 2000rpms. I decided to re-adjust my downpipes as well as bend the heatshield and they went away... or so I thought. I did the golf tee mod two days after the fix and the horrible rattle came back. So I plugged the tube back in and the rattle was greatly diminished. I can still barely hear it rattle at the same rpm range, but it's very, very faint. If it's truly the downpipes hitting the subframe/heatshield, wouldn't it keep rattling regardless of whether the flapper is open or not? I also remember an e92 owner describing a similar problem which vibrant resonators supposedly took care off... Anybody have any clue as to what's causing the rattle? TIA
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2007 C6 Corvette... VaraRam intake, FAST 92 IM, AI ported stock heads, Cam Motion cam, TSP headers/x-pipe, Borla S-Types, C6Z differential - 425whp
2008 135i... VTT S2+, MOTIV PI, FBO - 582whp (sold) 1999 C5 Corvette... Blackwing intake, C5Z titanium exhaust - 344whp (sold) Others sold: W204 C350, E90 330i, W-body Monte Carlo SS, etc. Last edited by bokyo1987; 03-25-2014 at 06:18 PM.. |
03-25-2014, 11:45 AM | #2 |
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Also interested, I have rattle under > 1/2 throttle from 1-2k rpm, not sure what causing it, tried repositioning dps, no luck, bought another set of better figment dps, will swap when warmer
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03-25-2014, 12:21 PM | #3 |
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Sounds like snakes in your exhaust. Watch out because I think those kinds are poisonous.
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03-25-2014, 05:00 PM | #5 |
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I had a similar problem.... I really hope its your exhaust. Mine was the dreaded wastegate rattle on the turbos. Same exact description. Luckily because of the defect, turbos are covered up to 80K miles if it is determined that it is infact your wastegate. Took mine into the stealership expecting to get robbed 1.5 weeks later two brand new turbos and an invoice for $0.00. However I have no mods (yet). hope all goes well gents!
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03-25-2014, 05:54 PM | #6 |
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Are you sure its not the bracket on the midpipes?
#5 & #6...
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03-25-2014, 06:16 PM | #7 | |||
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Thanks for all the info, folks! Hopefully I can figure this out sometime soon... It's really starting to bug me
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2007 C6 Corvette... VaraRam intake, FAST 92 IM, AI ported stock heads, Cam Motion cam, TSP headers/x-pipe, Borla S-Types, C6Z differential - 425whp
2008 135i... VTT S2+, MOTIV PI, FBO - 582whp (sold) 1999 C5 Corvette... Blackwing intake, C5Z titanium exhaust - 344whp (sold) Others sold: W204 C350, E90 330i, W-body Monte Carlo SS, etc. |
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03-25-2014, 06:22 PM | #8 |
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Does it do it only when it's warm or it does it all the time?
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E88 Crimson Red Vert MSport 6MT - Listing your mods in your signature is lame. BMS DCI/MHD E30 Flash!!/AA Sport FMIC/VRSF CP w Tial BOV/VRSF 3" DPs/550i clutch w SPEC SMFW/Apex EC-7s/Whiteline RSFB/E92 M3 FCAs/Bilstein B12 Pro Kit/VRSF inlets |
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03-25-2014, 06:34 PM | #9 |
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It's been getting warmer here lately and I just started to notice it lol. Can't replicate it while in park or neutral either. The odd thing is that it seems to only happen around 2000rpms under load. Sometimes I downshift while cruising and get nothing
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2007 C6 Corvette... VaraRam intake, FAST 92 IM, AI ported stock heads, Cam Motion cam, TSP headers/x-pipe, Borla S-Types, C6Z differential - 425whp
2008 135i... VTT S2+, MOTIV PI, FBO - 582whp (sold) 1999 C5 Corvette... Blackwing intake, C5Z titanium exhaust - 344whp (sold) Others sold: W204 C350, E90 330i, W-body Monte Carlo SS, etc. |
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03-25-2014, 07:36 PM | #10 |
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If you can get a sound clip it would help with the diagnosis. I know that would be difficult because you have to be driving to duplicate it. But consider that you have tampered with the exhaust in a lot of different ways, and you have parts from another car (mids) on yours. Empirically I would say that some part of the exhaust is what is doing the rattling. It could easily be a gasket that's only stressed when on boost or under load, or something that expands when the car is warm that you can't see when you try to look while it's cold. Could be an exhaust hanger or bracket, could be as simple as a loose nut washer or bolt. What I find interesting is that you said the noise got worse when you did the golf tee mod, which means more noise made your vibration worse. That's a good clue as to the problem in my opinion.
Start from one end and work your way to the other, you'll find it.
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03-27-2014, 04:21 AM | #12 |
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Take a close look at number 6 in the pic from @Dackelone Sometimes the bolt will bottom out and tighten but it won't actually tighten fully against the mid pipe. With a decent bit of force that bracket can move and spin. Its quite deceiving because everything looks fine just looking at it and giving the exhaust a good shake. Mine sounded very similar to what you guys are describing and I thought for sure I had a waste gate issue. I ended up finding it by looking under the car as I played with the throttle and sure enough I could see it rattle. I ended up having to cut down a washer to fit inside the bracket to act as a shim. Good luck!
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03-27-2014, 12:57 PM | #13 |
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Thanks for all the advise, folks! Will be getting underneath the 1 again soon to try and pinpoint the source this coming weekend.
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2007 C6 Corvette... VaraRam intake, FAST 92 IM, AI ported stock heads, Cam Motion cam, TSP headers/x-pipe, Borla S-Types, C6Z differential - 425whp
2008 135i... VTT S2+, MOTIV PI, FBO - 582whp (sold) 1999 C5 Corvette... Blackwing intake, C5Z titanium exhaust - 344whp (sold) Others sold: W204 C350, E90 330i, W-body Monte Carlo SS, etc. |
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03-27-2014, 02:17 PM | #14 |
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keep us updated
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11-12-2014, 12:16 PM | #15 | |
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11-12-2014, 01:13 PM | #16 |
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Sorry, man. I couldn't pinpoint the cause so I ended up re-clocking the DPs, bending the heat shield a bit, and re-tightening the t-bolt to the point of denting them a little. The rattling disappeared after all that, but I'm not sure which part actually caused it.
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2007 C6 Corvette... VaraRam intake, FAST 92 IM, AI ported stock heads, Cam Motion cam, TSP headers/x-pipe, Borla S-Types, C6Z differential - 425whp
2008 135i... VTT S2+, MOTIV PI, FBO - 582whp (sold) 1999 C5 Corvette... Blackwing intake, C5Z titanium exhaust - 344whp (sold) Others sold: W204 C350, E90 330i, W-body Monte Carlo SS, etc. |
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