Clunking in rear suspension

SpencerMH · 11-29-2014, 12:20 PM

I installed coilovers at the beginning of 2014, motion control shocks, a combination of ground control and swift springs and all the little things that go with it. I immediately had very audible clunking/rattling from the rear suspension but everything always checks out as properly installed when I get it looked at. I had it up on a lift today and was looking around, the ground control height adjusters/spring perches in the rear seem to have a lot of room around them, maybe them bouncing on the suspension arm as the suspension moves around is causing it? Does this pic look correct or there's too much room around them?

Pig Farmer · 11-29-2014, 01:48 PM

Do you have the height adjuster on the bottom? I was under the impression they sat on top and plugged into the frame.

TXmtrhed · 11-29-2014, 03:46 PM

Pig Farmer is correct. The GC adjusters go on top of the spring. No wonder it rattles!

MDORPHN · 11-29-2014, 05:54 PM

Yep, adjusters on top!

Neil

SpencerMH · 11-29-2014, 07:00 PM

Thank you guys, pictures worth a thousand words and at least two south florida race shops it's been to and no diagnosis!

M3 Adjuster · 12-02-2014, 12:45 PM

Quote:

Originally Posted by SpencerMH

Thank you guys, pictures worth a thousand words and at least two south florida race shops it's been to and no diagnosis!

Time to go back to the boardroom... Where Somebody should be fired ....

Kgolf31 · 12-02-2014, 01:22 PM

Yep, rideheight adjusters need to go up top. Hammer out the existing cup and it should pressure fit into place...Although that looks like it almost utilizes the cup in place.

Hrmm

HP Autosport · 12-04-2014, 04:38 PM

Yes, the height adjusters must go on top. If you are taking it apart, you may as well add some thrust sheets to prevent spring to control arm contact, another source of noise.

SpencerMH · 12-13-2014, 09:44 AM

Quote:

Originally Posted by HP Autosport

Yes, the height adjusters must go on top. If you are taking it apart, you may as well add some thrust sheets to prevent spring to control arm contact, another source of noise.

Hi Harold,
I flipped these into the proper position, wasn't hard other than needing a shop to do alignment after and though a little quieter, didn't solve the noise. So, where would the thrusts sheets go, can you post a link to where one could buy them, and for those on here not familiar like myself, whats the idea behind them?
Thank You,
Spencer

Pig Farmer · 12-13-2014, 10:08 AM

Quote:

Originally Posted by SpencerMH

Hi Harold,
I flipped these into the proper position, wasn't hard other than needing a shop to do alignment after and though a little quieter, didn't solve the noise. So, where would the thrusts sheets go, can you post a link to where one could buy them, and for those on here not familiar like myself, whats the idea behind them?
Thank You,
Spencer

The thrust sheets sit between the spring and the spring's contact point with the height adjuster and the camber link. The thrust sheets consist of 2 stainless steel sheets and 2 nylon sheets. They reduce friction/binding/noise between the contact points when the spring twists under compression, and they work great. You can purchase them from Harold at:

http://www.hpashop.com/Swift-Thrust-...t-bearings.htm
http://www.hpashop.com/Swift-Thrust-...t-bearings.htm

ayao · 12-13-2014, 12:16 PM

Make sure the shop installs them correctly. In addition to the proper location as Pig Farmer describes, the metal sheet directly contacts the spring, and the plastic sheet sits against the perch or height adjuster. My shop put them on the other way around.
The supplied instructions are relatively clear but the colors they use to distinguish the plastic from steel sheet make it misleading at first glance.

11-29-2014, 12:20 PM	#1
SpencerMH First Lieutenant 68 Rep 397 Posts Drives: 1M, M6 GC, 718GT4, F355GTS6 Join Date: Dec 2010 Location: Ft. Lauderdale Fl iTrader: (3)	Clunking in rear suspension I installed coilovers at the beginning of 2014, motion control shocks, a combination of ground control and swift springs and all the little things that go with it. I immediately had very audible clunking/rattling from the rear suspension but everything always checks out as properly installed when I get it looked at. I had it up on a lift today and was looking around, the ground control height adjusters/spring perches in the rear seem to have a lot of room around them, maybe them bouncing on the suspension arm as the suspension moves around is causing it? Does this pic look correct or there's too much room around them? Attached Images __________________ BSM 1M, MCS Coilovers, Pure Stg 2 Turbos, Walbro LPFP, JB4, BMS E85 Flash, ECS CF sealed intake, N54 Tuning DP's, Evolve Race Exhaust, Wagner FMIC, Stett CP w/ Tial BOV, ST BBK, Big Tires. M6 6MT Gran Coupe w JB4, 718 GTS, Lotus Esprit V8TT, Duc 998SBayliss
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11-29-2014, 01:48 PM	#2
Pig Farmer Major 340 Rep 1,293 Posts Drives: E92M Join Date: May 2010 Location: Florida iTrader: (0)	Do you have the height adjuster on the bottom? I was under the impression they sat on top and plugged into the frame. Attached Images
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11-29-2014, 03:46 PM	#3
TXmtrhed First Lieutenant 37 Rep 381 Posts Drives: VO 1M Join Date: Aug 2010 Location: Katy, TX iTrader: (0)	Pig Farmer is correct. The GC adjusters go on top of the spring. No wonder it rattles!
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11-29-2014, 05:54 PM	#4
MDORPHN Colonel 291 Rep 2,898 Posts Drives: AW 1M Join Date: Oct 2010 Location: Wash, DC iTrader: (0)	Yep, adjusters on top! Neil
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11-29-2014, 07:00 PM	#5
SpencerMH First Lieutenant 68 Rep 397 Posts Drives: 1M, M6 GC, 718GT4, F355GTS6 Join Date: Dec 2010 Location: Ft. Lauderdale Fl iTrader: (3)	Thank you guys, pictures worth a thousand words and at least two south florida race shops it's been to and no diagnosis! __________________ BSM 1M, MCS Coilovers, Pure Stg 2 Turbos, Walbro LPFP, JB4, BMS E85 Flash, ECS CF sealed intake, N54 Tuning DP's, Evolve Race Exhaust, Wagner FMIC, Stett CP w/ Tial BOV, ST BBK, Big Tires. M6 6MT Gran Coupe w JB4, 718 GTS, Lotus Esprit V8TT, Duc 998SBayliss
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12-02-2014, 01:22 PM	#7
Kgolf31 Brigadier General 459 Rep 4,531 Posts Drives: 2007 Z4MC, 2012 128i Join Date: Sep 2008 Location: Ohio iTrader: (4)	Yep, rideheight adjusters need to go up top. Hammer out the existing cup and it should pressure fit into place...Although that looks like it almost utilizes the cup in place. Hrmm
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12-04-2014, 04:38 PM	#8
HP Autosport Supreme Allied Commander 3816 Rep 54,319 Posts Drives: F80 M3 Join Date: Mar 2007 Location: Santa Barbara, AP, Brembo, GIAC, Koni, Ohlins, Performance Friction, www.hpautosport.com iTrader: (36)	Yes, the height adjusters must go on top. If you are taking it apart, you may as well add some thrust sheets to prevent spring to control arm contact, another source of noise.
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12-13-2014, 12:16 PM	#11
ayao Thread killer 636 Rep 1,895 Posts Drives: 1M Join Date: Aug 2011 Location: CA iTrader: (2)	Make sure the shop installs them correctly. In addition to the proper location as Pig Farmer describes, the metal sheet directly contacts the spring, and the plastic sheet sits against the perch or height adjuster. My shop put them on the other way around. The supplied instructions are relatively clear but the colors they use to distinguish the plastic from steel sheet make it misleading at first glance.
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