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Metal Rattle Sound

Hey all, ive been dealing with a metal sounding rattle for almost 2 years now... The sound only comes on while im moving (under load) and at around 4k RPM.

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Old 09-09-2014, 09:16 PM   #1 (permalink)
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Default Metal Rattle Sound

Hey all, ive been dealing with a metal sounding rattle for almost 2 years now...

The sound only comes on while im moving (under load) and at around 4k RPM. I have checked all exhaust components, and have been under my car with a fine tooth comb... its driving me mad, i even removed every piece of heat shield under the car, but it still happens.

I cannot reproduce the noise at a stand still, and sometimes the noise will go away for a while. Im running out of ideas... I have even removed the undertray/skid plate.

The sound seems like its coming from mid car, but I can't really tell while driving.

Ideas???
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Old 09-09-2014, 10:53 PM   #2 (permalink)
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My old g35 used to make the same exact sound, usually when punching it. It sounded like clutch chatter to me, my 370 actually makes the same sound but not as loud. Look up clutch chatter while accelerating on google, a few forums pop up with similar noise complaints.
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Old 09-10-2014, 09:27 AM   #3 (permalink)
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Might sound stupid, but have you ruled out the metal components of the jack sitting in the rear of the car in that hard polystyrene? I put one piece back wrong, and it rattled against another until I moved it (actually wrapped it in a small cloth too). I realize it should be pretty easy to determine whether your noise is coming from inside or outside the car, but just thought I'd throw it out there.
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Old 09-10-2014, 11:52 AM   #4 (permalink)
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I've checked that, and I currently have no jack or tools in the car. The sound is most definately coming from under the car. I can hear the reflection of the sound when I'm next to something like a guard rail a lot louder.

Also it's not just under acceleration, if I hold at the rpm that makes it rattle it will keep on rattling forever. I wish what ever it was would just break already at least I would know what it was. It takes the enjoyment out of driving the car honestly
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Old 09-10-2014, 12:20 PM   #5 (permalink)
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Quote:
Originally Posted by AlexRaymond19 View Post
I've checked that, and I currently have no jack or tools in the car. The sound is most definately coming from under the car. I can hear the reflection of the sound when I'm next to something like a guard rail a lot louder.

Also it's not just under acceleration, if I hold at the rpm that makes it rattle it will keep on rattling forever. I wish what ever it was would just break already at least I would know what it was. It takes the enjoyment out of driving the car honestly

That's strange, could you possibly record a short video of the noise?
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Old 09-10-2014, 03:48 PM   #6 (permalink)
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I will get one on my way home from work with my phone
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Old 09-10-2014, 03:50 PM   #7 (permalink)
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I've always thought it could be something to do with the flywheel though... It sounds just like when you disengage the clutch at a stop, only really f ING loud and only at right before 4k rpm under load
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Old 09-11-2014, 11:12 PM   #8 (permalink)
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check the tack weld CLOSELY on the flanges on the FI x pipe, chased that rattle for 2 weeks....right around 3500 rpm for me. Wiz that shiz right off.
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Old 09-11-2014, 11:24 PM   #9 (permalink)
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check if the exhaust is rattling on the mid support, mine was it looked like it cleared, no problem, but it didn't while driving at some rpm's. Just give it a good shake while under the car.
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Old 09-13-2014, 05:04 AM   #10 (permalink)
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It might be ur sub-frame bushings, i live in NYC and the roads are like those at the 3rd world country, my bushings are gone. Currently waiting for my replacements in the mail.
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Old 09-13-2014, 07:44 PM   #11 (permalink)
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a video would definitely help. what mods do you have? could it be an intake pipe rattling?
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Old 09-15-2014, 12:14 PM   #12 (permalink)
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That's the best video I can get right now. Doesn't do the rattle justice.

I will check the above suggestions. Where are the subframe bushings? Is there an easy way to tell if they are gone?
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Old 09-15-2014, 12:19 PM   #13 (permalink)
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Quote:
Originally Posted by juld0zer View Post
a video would definitely help. what mods do you have? could it be an intake pipe rattling?
Don't think it's the intake pipes, I shoved some padding in there to test it out. Mods are momentum headers, z1 test pipes and fi nonres exhaust.

I realize the video I posted sounds like air blowing, but in person is definately sounds metal on metal. It's not the normal hiss or anything like that. You can hear it twice in the video, once inside the car, and once when I stick my phone out the window
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Old 09-15-2014, 03:23 PM   #14 (permalink)
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i watched it on my iphone and i cant hear anything over the wind noise. apologies i cannot be of much help at this point.

have you put the car on a hoist and had an assistant listen while you rev/drive it with the wheels freespinning?
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Old 09-15-2014, 04:52 PM   #15 (permalink)
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Do you also get it just under 2k?

I have the same issue and think it's from the exhaust hitting a support brace at those resonant frequencies. I haven't had the time or the tools to check though, but it's been going on for over a year now. I've learned to live with it, but it sure gets annoying sometimes.
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