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Old 07-04-2020, 11:04 PM   #1
Thorphax
Scooby Newbie
 
Member#: 475476
Join Date: Oct 2017
Default Update on squeaky/creaky rear suspension - Modified

Hey all,


This is an update from this thread

https://forums.nasioc.com/forums/sho....php?t=2922224


TL;DR
I drive a 2018 WRX STI

I run polyurethane bushings on my trailing arms, upper inner control arms, and ball-joints on lower control arms, endlinks, toe arms. Subframe has the Whiteline bushings.
The rear suspension, when not under heavy load ( low speed up and down, or bouncing in the trunk, etc ) is VERY squeaky, and creaky.



The update:


Yesterday I took the suspension apart again and relubed ALL the poly bushings, i practically drenched them in lube, inside and out, the well where they sit in, everything. I couldn't have lubed them more if I tried.



I used Super Lube 41160 Synthetic Grease NLGI 2 with PTFE, found here:
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1


They were all fine yesterday, I did a bounce and test drive test, all good.

Took the car for another test drive today, and they're back to being as squeaky and creaky as they were before.


I'm truly not sure what else to try, if even there is anything else to try. Is this just how polyurethane bushings are? Do they " break in " if I just drive the car more often? Should I use a different kind of lube?



My assumption is because of the high torque pressure on them when you torque the bolts, plus the up and down movement, that the lube eventually gets squeezed out, no matter what you do


Any help or suggestions would be appreciated, cheers!
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Old 07-05-2020, 10:22 AM   #2
Norm Peterson
Scooby Specialist
 
Member#: 498642
Join Date: Mar 2019
Chapter/Region: Tri-State
Location: our wrx IS the family sedan
Vehicle:
'19 WRX Ltd 6M dgm
'08 Mustang GT (the toy)

Default

Next time you pull it all apart to re-lube the poly bits, carefully check again to see if the polyurethane pieces are longer than the metal inner sleeves that run through them. My guess is that you'll find that they do.

Polyurethane is a fairly soft material, and you can modify it fairly easily. What you want to do is make sure that the polyurethane is not being compressed as you tighten the fastener running through the bushing assembly. Tapering the ends into flat cones helps in other respects. Here's a better picture.



Getting the poly away from the bracket sides is what removes the squeaking and does not depend on lubrication.


Norm

Last edited by Norm Peterson; 07-05-2020 at 10:29 AM.
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Old 07-26-2020, 06:02 PM   #3
Thorphax
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Member#: 475476
Join Date: Oct 2017
Default

Quote:
Originally Posted by Norm Peterson View Post
Next time you pull it all apart to re-lube the poly bits, carefully check again to see if the polyurethane pieces are longer than the metal inner sleeves that run through them. My guess is that you'll find that they do.

Polyurethane is a fairly soft material, and you can modify it fairly easily. What you want to do is make sure that the polyurethane is not being compressed as you tighten the fastener running through the bushing assembly. Tapering the ends into flat cones helps in other respects. Here's a better picture.



Getting the poly away from the bracket sides is what removes the squeaking and does not depend on lubrication.


Norm

So I have tried this method, and even went as far as getting a complete new set of synthetic elastomer bushings from Whiteline, that are designed exactly like that, and despite following eeeevery single instruction point correctly, lubing all the parts, the contact surfaces, the inner bore, everything, the suspension still squeaks and creaks like crazy, and its coming FROM these bushing points. I'm out of ideas of what to do. Everything else in the rear of the car are ball joints, or OEM bushings for the wheel hubs.



I'm just about ready to call it quits and order aftermarket arms with ball joints instead, 2 months trying to get these to work and I'm out of ideas.
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