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Old 03-03-2008, 12:35 AM   #1
skydes
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Member#: 141347
Join Date: Feb 2007
Chapter/Region: SCIC
Location: Anaheim, California
Vehicle:
2005 WRX
WRB

Default Grunching noise from rear suspension when going over bumps

I'm hearing this grunching noise from the rear suspension when I go over bumps. For example when I back down the my driveway and roll over the 2'' (inch) lip at the end of it it grunches. No matter how slow I go I hear the "gruuuuuuunnchhh" noise. First I thought it was my swaybar in the bushings (Cobb hollow sway) but the suspension is barely compressing and decompressing when going over the lip. Could it be my tophats are not tight enough? I torqued them to 10ft/lbs (didn't do the full 14.4 ft/lbs for fear of snapping the threads).

Mods:

STi OEM Rear tophats
STi struts
STi springs
Cobb hollow sway
Perrin Rear endlinks.
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Old 03-03-2008, 06:20 AM   #2
RaceComp Engineering
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thats a starting point ,..yeah. Many people over torque those to crazy amounts(20-30) so I dont think setting them to the correct would be an issue. 10 I think is too low and if your tq wrench is off (like many are since most dont turn them back to zer owhen done)..its prob off. THat 4 ft lbs could be it. Most do it by hand and never have an issue and that ends up being in the 20's.

Myles
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Old 03-03-2008, 01:49 PM   #3
skydes
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Ok, I'll try that and report back.

Thanks.
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Old 03-04-2008, 11:46 AM   #4
hwy61
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Gone....Somewhere in MS

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The rea bushings in my 05 STI have been replaced 4 times under warranty and they are doing this very thing again. If you come to a stop with the rear end jacked up a bit, as soon as you let off the brakes or drive in reverse...........a really aggravating crunching sound that you can feel in your seat. The fix is simple and I'm thinking about simply greasing with silcone or something myself.
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