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Old 08-03-2015, 05:10 PM   #1
Jsmall
Scooby Newbie
 
Member#: 290715
Join Date: Aug 2011
Chapter/Region: South East
Location: Clarksville/Fort Campbell
Vehicle:
09 STI
Blue on Gold

Default Grinding with passengers in back

Hey everyone, I have a 2009 STi with a stock suspension, the only upgrade is a front strut tower brace.

I've been having this weird noise coming from both sides in the rear whenever I have passengers in the back seat, or whenever I go over a bump with some speed. It sounds like a grinding noise, not a bearing noise, almost like the wheel is rubbing in the fenderwell.

I've taken the rear wheel end apart and found nothing out of the ordinary. I've removed the bearings and they both spin freely with no noise. The rear struts don't appear to be blown. I removed the sway bar and end links but the noise is still there. The bushings all seem to tight and in place.

I have quite a bit of experience working with cars and this one has me stumped. Any help, or things that I can check would be really appreciated.
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Old 08-05-2015, 03:00 PM   #2
iforgettopee
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Member#: 329139
Join Date: Aug 2012
Chapter/Region: BAIC
Vehicle:
2013 WRX

Default

you haven't mentioned anything about your wheel/tire setup...

not sure what you mean by removing the bearings - wheel bearings are pretty labor intensive so the fact that you say this so casually leads me to believe you are not talking about the wheel bearings like people will assume you are.

blown rear shocks isn't a common source of a grinding sounds since it's primarily an up & down movement
sway bar is also another uncommon source of grinding sound and there is very little movement with this part

can you be more specific about when you hear the sound? or whatever is happening at the time of the grinding sound?

based on the info you've given so far, I am assuming you have a silly wheel/tire combo and your tire is rubbing against the fender.

you could roll your fenders or get narrower tires or a different wheel/tire combo all together

some pictures would help also
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Old 08-05-2015, 03:19 PM   #3
Jsmall
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Member#: 290715
Join Date: Aug 2011
Chapter/Region: South East
Location: Clarksville/Fort Campbell
Vehicle:
09 STI
Blue on Gold

Default

You're right, the wheel bearings can be labor intensive if you don't have the right tools. I disassembled the wheel ends completely. Calipers, rotors, parking brake shoes, and wheel bearings. I have factory wheel and tire fitment, and here are no signs of rubbing the fender. I have ordered the Perrin subframe lockdown kit, and will be installing them this weekend. Hopefully that will solve the problem.
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Old 08-05-2015, 06:47 PM   #4
iforgettopee
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Member#: 329139
Join Date: Aug 2012
Chapter/Region: BAIC
Vehicle:
2013 WRX

Default

interesting! I would be really intrigued if the subframe kit resolves your issue.

I've gone through the rear end several times on my car also and I'm pretty stumped with ya... hopefully someone else can chime in.

I wonder if the sound could be diff/cv joint related? I'm leaning on no because you would hear it w/o passengers and it would be constant and it would get louder with speed.

good luck
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Old 08-05-2015, 06:51 PM   #5
Jsmall
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Member#: 290715
Join Date: Aug 2011
Chapter/Region: South East
Location: Clarksville/Fort Campbell
Vehicle:
09 STI
Blue on Gold

Default

I'm at the point of just throwing some parts at it, this way I can justify the suspension upgrades to the wife.
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Old 08-05-2015, 06:58 PM   #6
Annihilator817
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Member#: 296742
Join Date: Oct 2011
Chapter/Region: NESIC
Location: RI
Vehicle:
'16 STI,'11 WRX,
'96 328i DSP

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The wheel bearings are bolt on.

Very easy to remove with basic hand tools.



On the OP, how heavy are your friends? These cars are really softly sprung in stock form.
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