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Old 03-04-2013, 02:39 AM   #1
VinceCarter
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Default Grinding Metallic Like Noise

I've been searching and can't seem to find what I'm looking for. I have an 06 WRX TR that has made a noise since I have got it that comes from what sounds like the somewhere under the clock pod or intercooler area of the engine (or transmission?). It is a noise that I cannot seem to put into good words other than a faint sound of metallic objects grinding. It isn't very defined but enough that passengers notice it. It comes about anytime after 2000 RPMS I'd say and is most prominent in 5th gear and 4th gear in that order. It seems to go away a little bit with acceleration and is heard best under cruise control/constant speed in the 2K-3K RPM range and during deceleration.

When I had my new clutch installed a reputable performance shop (that does many Subarus) told me it was a typical WRX transmission noise that comes about with age/miles? I have not heard this noise though in other Subies. Ever since then it has not gotten worse as far as I can tell and has been around for maybe 10K-ish miles now.

The car had an SPT SRI and SPT catback as the only mods when this noise started...

BTW I've heard what bad gears sound like and I do not believe this sounds quite like that. Anything else it could be?

I will try and get a video up soon!!! I tried with my phone and it couldn't pick it up over my exhaust.

Thanks!
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Old 03-04-2013, 08:44 PM   #2
twitchion
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In for explanation. My 06 wrx recently started making a similar noise. Sounds like something dragging or metal on metal. Can't find anything that explains why it sounds like it does.
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Old 03-04-2013, 09:08 PM   #3
spintheground
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Does it sound kinda like a desktop computer when you defragment the hard drive ?
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Old 03-04-2013, 09:16 PM   #4
Francois_
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Take a look at your heatshields. Especially the shield covering your turbo and any exhaust shields. It's possible that one got a little loose and is causing the noise you're hearing.
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Old 03-04-2013, 10:33 PM   #5
twitchion
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I have looked top to bottom, every heat shield I could find. Nothing even moved.
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Old 03-04-2013, 11:26 PM   #6
VinceCarter
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Quote:
Originally Posted by Francois_ View Post
Take a look at your heatshields. Especially the shield covering your turbo and any exhaust shields. It's possible that one got a little loose and is causing the noise you're hearing.
I don't have heat shields on my up pipe, downpipe or turbo (probably should get one though). They're all after market parts except for my headers.

And my sound is almost like if you had a metal ball or pipe or some small closed object but you had some small bits of metal or sand with air flowing through the object making it scrape against the walls of this metal object.

After putting my ear to my shift knob today while it happened it did seem like it could be coming anywhere from under my shift knob to as far front as under my clock pod area. It only seems to happen in 5th gear (final gear) and is most noticeable between 2K and 3K RPMs.

My computer hates me and is giving me a hard time I'm trying to watch the video I took of it today to see if it is audible so if my computer ever works and it is audible I will upload it here!
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Old 03-05-2013, 01:43 AM   #7
VinceCarter
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Well I took a video with my Nikon P100 camera and it couldn't pick up the sound while cruising. It's pretty clear while inside the car but not profound enough to be picked up by the camera -__- I really want to know what this is because it may impact whether I buy a bigger turbo or not.
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Old 03-05-2013, 07:27 AM   #8
spintheground
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http://www.northerntool.com/shop/too..._385487_385487

This will make your life much easier.
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Old 03-06-2013, 09:42 PM   #9
VinceCarter
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Quote:
Originally Posted by spintheground View Post
http://www.northerntool.com/shop/too..._385487_385487

This will make your life much easier.
Hmmm I recently heard of this idea/tool and it sounds like it could be very helpful. BUT it only makes the noise while in gear...this is leading me to believe this HAS to do with my transmission? Only 5th gear too mostly. BUT again it hasn't gotten any worse (I think) for a couple thousand miles...could this still mean 5th gear is going on me? Some sort of "typical" old transmission noise (like the performance shop told me)?
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Old 03-11-2013, 11:40 PM   #10
VinceCarter
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Anybody else have insight?
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Old 03-15-2013, 12:27 AM   #11
VinceCarter
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Took it in to a reputable Subaru dealer in my area for a second opinion and the tech said it was a "transmission whine" and to just keep an eye on it -__- I don't like the sounds of that. Too open ended!
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Old 03-15-2013, 07:42 PM   #12
twitchion
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Well upon further reading it almost seemed like it was the rear diff. Checked my tire pressure and sure enough it was 32 psi all around. I aired up the fronts by 2 psi and took 2 out of the rear and I haven't heard the noise since
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Old 03-21-2013, 10:37 PM   #13
VinceCarter
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Okay I've noticed it is 5th gear deceleration between 2000 and 2250ish RPM. Once I give it some throttle in this area it quiets quite a bit. I sometimes get the noise a little bit between 2250ish to 3000 RPM but not as defined and it's usually on deceleration and slight throttle. I do not experience this anywhere in any other gear though...

I'm looking for any kind of insight or speculation at this point because through all of my searching I've found nothing similar to this.
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Old 03-21-2013, 11:01 PM   #14
twitchion
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Could it be your clutch? I think I've read some as certain clutches making noise. But I'm not for sure
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Old 03-21-2013, 11:09 PM   #15
VinceCarter
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Quote:
Originally Posted by twitchion View Post
Could it be your clutch? I think I've read some as certain clutches making noise. But I'm not for sure
I've had this noise since I've got the car at 98K miles and it didn't go away after getting a new ACT HDSS clutch with an OEM throwout bearing and resurfaced flywheel. The performance shop that did the clutch install said it was just a "typical old WRX tranny noise" but I just don't see it.

My friend has an 04 WRX with 123xxx miles and his doesn't make this noise. I just feel like there's more to this. Obviously I would love to be wrong but the noise is damn annoying!
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Old 03-21-2013, 11:36 PM   #16
twitchion
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Try checking your tire pressure. May not notice it at first but I'm pretty sure it worked for me. Just make sure there's a 4 psi difference front to back, with the back having less
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Old 03-21-2013, 11:55 PM   #17
some dude
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Have you checked the tranny fluid level? Ever changed the fluid? Any chunks in it? Is there a magnetic drain plug?
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Old 04-02-2013, 09:31 PM   #18
VinceCarter
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ANSWERED: I was finally told by a reputable Subaru tuner that the noise is from the front differential bearings coming loose or going bad (can't remember what he said) moving left to right but it is nothing related to transmission failure and isn't a cause for concern but it will most likely get louder.

Once it gets really annoying then I may want to get a tranny swap because to fix it you'd have to pull the tranny and take it apart blah blah blah lots of money might as well upgrade then.
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Old 04-03-2013, 09:36 AM   #19
danger1138
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Im glad u found your answer. I have the same noise too and only get it on cold starts, once car is warmed up and driving for like 10 min or so it goes away. The best way i can describe my noise is that it sounds like two coins underneath the passenger seat making contact..
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Old 04-03-2014, 03:10 AM   #20
Frdreamer86
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Quote:
Originally Posted by VinceCarter View Post
ANSWERED: I was finally told by a reputable Subaru tuner that the noise is from the front differential bearings coming loose or going bad (can't remember what he said) moving left to right but it is nothing related to transmission failure and isn't a cause for concern but it will most likely get louder. Once it gets really annoying then I may want to get a tranny swap because to fix it you'd have to pull the tranny and take it apart blah blah blah lots of money might as well upgrade then.
Maybe it is, i get the same noise but only get it when i let go of the gas on a gear that is above 2k rpm. For instance, if I'm in 3rd gear at 2500 rpm and accelerate to 3200 rpm then release the gas pedal causing it to engine brake, then it makes that that metal grinding noise, it will get quieter as the rpms drop. I just notice this noise a week ago, i have a 04 wrx with 88k miles, just bought it, in my case i think it might be the throwout bearing. Sometimes this happens when drivers ride the clutch alot (when you use engine braking, braking while in a gear with out pressing in the clutch to go to neutral) you know like when some people slow down on their cars while in a gear to make the exhaust sound cool or whatever right before then make a complete stop then they press the clutch, dont do that.

I say this cuz i had a Honda Civic with the same grinding noise and only happened when i released the gas pedal while on a gear, but in the civic the noise was louder. And the noise came from right under the gearbox near the tranny.

If u put your hand in the shift box when this happens you can sometimes feel it.
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