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Discussion Starter · #1 ·
My 2015 WRX (26k miles) is making small rotating in motion sound from driver side front when car is moving (either in gear or not in gear) I first thought that the noise was coming from the front wheel...so the Subaru dealer checked all of my wheels, brakes, bearings and they were fine. While I was at the dealer, the mechanic couldn't identify the noise when I kept pointing out. I'm not 100% sure where the noise is coming from but I have a vague sense that it's coming from the firewall. The noise sounds like a wheel spinning really fast WITHOUT metal grinding, humming, or friction sounds.....that's the best I can describe. Also I wanna point out that I have group N transmission mount installed and engine guard has a small bent from scrape. Can one of these be the reasons why? I'm really confused.
 

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You could be hearing the internals of the transmission or clutch. If you put in a super rigid transmission mount less gets dampened out.

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Discussion Starter · #3 ·
You could be hearing the internals of the transmission or clutch. If you put in a super rigid transmission mount less gets dampened out.

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yeah....it's very rigid. does transmission or clutch have spinning mechanism while driving?
 

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It's your transmission, everything in there spins. I can tell you my former JK Jeep before it died you had a random whirr noise. If you have a CVT they have a distinct spinning noise too from the ones I've been in.

It's common for people to hear the throw out bearing. I've seen several threads mentioning noisy ones.

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Discussion Starter · #7 ·
It's your transmission, everything in there spins. I can tell you my former JK Jeep before it died you had a random whirr noise. If you have a CVT they have a distinct spinning noise too from the ones I've been in.

It's common for people to hear the throw out bearing. I've seen several threads mentioning noisy ones.

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I'm going to revert my group N transmission to OEM one to see if the noise goes away. It's not loud but it drives me nuts. If the noise still exists, you think it may be the transmission bearing? I pressed down the clutch while my car was moving....it still spins. So I'm assuming the clutch TOB is fine.
 

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Exactly what it is I can't say for sure. But with a super stiff mount that leads me to believe the rotational vibrations of all the parts in the transmission are feeding back through the mount.

Before you get hard at it, does the sound change as you roll faster? As the engine spins up? What conditions cause change to the sound?

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Discussion Starter · #9 ·
Exactly what it is I can't say for sure. But with a super stiff mount that leads me to believe the rotational vibrations of all the parts in the transmission are feeding back through the mount.

Before you get hard at it, does the sound change as you roll faster? As the engine spins up? What conditions cause change to the sound?

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the sound seems monotone...and doesn't change. However, the spinning rate changes as my car slows down on any condition.
 

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Discussion Starter · #10 ·
Exactly what it is I can't say for sure. But with a super stiff mount that leads me to believe the rotational vibrations of all the parts in the transmission are feeding back through the mount.

Before you get hard at it, does the sound change as you roll faster? As the engine spins up? What conditions cause change to the sound?

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I reverted back to OEM transmission mount. Rotaing in motion sound still exists from driver side. Could my bent skid plate possibly create vibration or rotaing noise? It's bent inward toward the turbo.
 

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Anything behind them? I'm really not sure. It's got to be something that is in contact with a drive line component or it would change with engine rpm

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Discussion Starter · #16 ·
Anything behind them? I'm really not sure. It's got to be something that is in contact with a drive line component or it would change with engine rpm

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I don't know if this video will prove anything but here it is. It's hard to pick up the noise. Pay attention to the highest pitch turning noise.

https://youtu.be/tyqdiZLac7k
 

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Discussion Starter · #17 ·
Anything behind them? I'm really not sure. It's got to be something that is in contact with a drive line component or it would change with engine rpm

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It's actually speed related. RPM has no effect on it. No change in sound but the spinning....it spins faster at high speed and gets slower at low speed. I inspected dust plate (side and back) and they were fine.
 
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