just install my powertrix coil overs and love the look, but started driving them and noticed a noise from the back. its a clanking sort of noise and driving me crazy, I checked the spring size which is correct (200mm), the rear sway bar and end links are fine, and all the bolts are tightened correctly. I'm not sure what else to check for. I read something about the springs needing more preload from somewhere else on the forum, however I thought I did the preload correctly, just enough so the spring can rotate but not move up or down.

would appreciate any help

 

Dude I have the same exact problem but with only my pass rear! It's driving me nuts I've made sure everything was tight and both coils were set the exact same. Idk what this could be.

 

I know you said that you checked your endlinks, but i would check again. SO MANY people have clunking noises after doing suspension work and that is due to them either putting on their rear swaybar backwards, or tightening down the endlinks improperly causing the bar to preload and the links to bind up.

Are they adjustable endlinks?

Your preload on the springs sounds fine ... i.e. 0 preload.

 

i feel u joe, ive probably checked everything about 3 times with no solution.
last time i checked one of the endlinks looked twisted up so i thought it might be the problem i didnt have much time to mess with it so i took the endlinks and bar completely off and drove but the noise still happens

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You might find that the problem could be that the spring is rubbing on the car itself.
As the suspension goes up and down, through the arcing movement, you will see that the spring gets very close to the side of the car. Lift the car up at the rear and let the suspension drop down, then look and see if you can see any paint that has been rubbed off the springs.
If you do see paint rub, that is the problem. To fix it you may have to space the bottom spring mount in slightly by about .5 - .75 in. If you do have to space the mount in, you will need a longer bolt.
One way to test this, is too push down on the back of your car and see if you hear any rubbing noise. The left side of the car seems to be more prone to this then the right.

Rotaman

 

i see, does that mean that the lower i go the more of a problem itll be

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I had this problem when I first installed mine. My problem was that I did not fully tighten the locking nuts. Make sure those and all the other suspension components are tightened. Take a flathead and hammer the locking nuts tight (not overly tight obviously) and see if that makes a difference. Ride height shouldn't make a difference. I am pretty low and have no sounds.

 

if all the free fixes don't work, try replacing the 12mm bolt on the underside of the hat with a longer one. it was a simple fix for me.

 

eh? ...

if he has the right diameter springs (ptrix springs are linear rates so they are same diameter throughout), there should be no issue with springs contacting the car's body.

 

If you ferked with your sway bars, it could be those (the bushings). Just a though.

 

You are right in saying that there should be no issue with springs contacting the cars body, but sometimes it does happen.
I'm just saying this is worth checking, I have seen it happen.

Rotaman

 

not very tight

 

just using the spanner wrenches isnt enough? i do remember not being able to get the locking nut that is for height (located inside the spring) very tight

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Using the spanner wrenches for the preload adjusting locking nuts is fine, but yes use a flathead to tighten that inner one because that was what caused knocking with mine.

 

cool, ill give this a try. unfortunatly i wont be able to try this til monday

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Hey man idk what it was but I was messing with it today and brought my rear down some more and the noise is gone. I agree with johnvx1k that it could be the inner lock nut tho.

 

nice, im just going out now to try and see if that works for me

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just finished messing with it, and got back from a test drive. noise is gone, turn out to be the inner locking nut was not tight enough. thanks guys for the help

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Glad to hear you figured it out! Spread the word to other powertrix owners. Seems to be a common problem and many don't know how to solve it.

 

Nice dude, glad it worked out! Now where are some pics?!?!? Haha