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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Suspension | Brakes | Chassis > Help on coilover installation



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      12-14-2012, 02:43 AM   #1
KwlAznKid
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Help on coilover installation

Hi everyone,

Hoping to see if anyone has some advice for me, i just installed st coilovers on my car and for some reason ONLY the passenger rear is making a loud clunking sound over every small dip or crack on the road. Driver's side is fine, i checked EVERYTHING, everything is tight so I'm really lost, i even took it into a shop today and they told me the only thing they can see is that there is some wiggle room on the spring (when the car is on the lift) so he thinks that because of that wiggle it's making the clunking sound when i'm driving.

I installed it with the adjusting perch on top, then the spring, then i took the oem rubber cover that was on top and flipped it around and put it on the bottom (as I read online/forums) and did the exact same thing for the driver's side which is perfect. (some wiggle room if i shake the spring hard but definitely not even CLOSE to how much play i can get on the passenger side). I'll attach some pics but did I do anything wrong?! help plz the sound is killing me!!

thanks
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      12-14-2012, 02:48 AM   #2
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I should add the wiggling is at the top of the spring, the bottom seems pretty solid and not mobile, there is definitely room for play at the top where the adjuster/spring/car's frame meets


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      12-14-2012, 02:55 PM   #3
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try drving around with a passenger to find out if the sound is still there. If it is, try corner weighting/balancing. You can also try to put a piece of rubber insert between the spring and the perch if you dont want to spend money. I think thats where the sound is coming.
make sure you do both sides though. For an alignment I always go to westend.
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      12-14-2012, 03:04 PM   #4
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Quote:
Originally Posted by bobse View Post
try drving around with a passenger to find out if the sound is still there. If it is, try corner weighting/balancing. You can also try to put a piece of rubber insert between the spring and the perch if you dont want to spend money. I think thats where the sound is coming.
make sure you do both sides though. For an alignment I always go to westend.
i did drive around with a passenger, same sound . i thought about adding a rubber piece as well, any idea where i could get something like that though? it'd have to be pretty durable i'm assuming
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      12-14-2012, 04:43 PM   #5
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on my evo, i used a rubber insert from a honda suspension. You just wrap it around the spring. It is readily available at any honda dealership.
as long as there is no big movements on the spring against the perch, they will last for a while.
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      12-18-2012, 02:03 AM   #6
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might be your bumpstops on your shocks, not the springs
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      12-18-2012, 03:49 AM   #7
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Quote:
Originally Posted by Boneout View Post
might be your bumpstops on your shocks, not the springs
+1

When I did my KW's on my car I didn't get the right order/combination of bushings and spacers on the top of the shock(inside the trunk) causing a clunking sound in the rear.
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      12-18-2012, 07:00 AM   #8
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Get new bumpstops and add a rubber "washer" on the perch that might help. Good luck!
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      12-18-2012, 09:54 AM   #9
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You need to pre load the springs by adjusting the spring collar.
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      12-18-2012, 10:12 AM   #10
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Check that the nut holding the strut top to the shock is tight: basically do a nut-and-bolt check on all connectors on that side.
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