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05-06-2015, 03:54 PM | #1 |
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HELP ME! to figure out this front suspension noise
*Edit: not resolved, camber plates cut down on overall noise though
Long read, but if you want to help I'd appreciate it. I've been dealing with this issue since last summer now and I need some help. I can't freakin' figure it out and neither can the shops I take it to. I got the best parts installed by the best people, and for some reason, I still get problems. Here is my setup up front which is where the noise is coming from: JRZ RS dampers Ground Control adj. sway bar end links Eibach 6" length 2.25" ID main spring Eibach helper springs on top of the main springs Ground Control Race plates. All parts purchased brand new and professionally installed by VAC Motorsports and the second install was done by Bavarian Specialties (I went through 2 sets of dampers, switched shops for convenience only) Everything else is stock up there. Car has 45k miles on the stock parts All the aftermarket parts are 1 year old EXCEPT for the JRZs which are about 2 months old now and the Ground Control end links which are 1 month old. The Noise: It's so hard to describe first off so bear with me. It sounds like it's coming from the front 2 strut areas. It's not metallic in sound. No squeaks, clanking, etc. It's like a muffled loose sound and when I hear the noise, something actually feels loose, like something is not seated properly, or something isn't tightened, but it's not metallic sounding so I can't imagine it's the camber plates or a spring. It's like a soft "ba-boom" type noise. I wouldn't describe it as a clunk, it's more of a thud. I have a local friend with an E90 who has the GC Race camber plates with JRZ dampers and his camber plates are bad, and they do nothing but squeak, rattle, clank together, etc. My noise is nothing remotely close to that! It doesn't sound like 2 pieces of metal are clanging together. It's almost like an abundance of tire noise, a shit load of it that shouldn't be there. I almost want to say it's a problem with the wheel/tire but whether I'm on an 18" pilot super sport, or my 17" blizzak winter wheels/tires, it makes no difference. So the guy with the E90 has the same camber plates and the JRZ RS1 damper, and he does not have the noise I have. Another guy I know locally has a 335i also with JRZs, JRZ race camber plates, and the same Eibach main/helper spring setup and his car is totally silent with no noise at all. When it happens: It happens when I hit a decent size bump or a series of small bumps, mostly at low speeds. It doesn't need to be super big, just a bump where the car moves a small bit upwards vs. soaking up the entire bump. When it does this, that's when I hear it coming from the front right or left side. It's independent on both sides, so just because I hit a bump on the right, doesn't mean I'll hear it on the left. It's like a "ba-boom" type noise lol. The worst is when I go over a series of small bumps, like where a really shitty road patch job was done, then it just goes CRAZY and almost turns into a rattle, but once again, NOT metallic in sound. Nothing is felt through the steering wheel either and everything is tight, steering is great, still handles the same, etc. I've been to 2 track events with this noise and there are no symptoms that anything is wrong with the car no matter how hard I'm in a turn, braking, etc. The noise also doesn't happen in any other situation other than a bump. Turning hard won't do it, dips in the road, braking hard, nothing. I notice it is worse in cold weather. Took it to the shops: Both VAC Motorsports and Bavarian Specialties have looked at this and can't find anything problematic. Before the install of my second set of JRZs, I asked the tech if the parts were still in good shape like springs, camber plates, etc. and it was confirmed that everything was fine. I saw them myself, and they looked good to me. When Bavarian Specialties looked my car, they checked everything (don't know exactly what they checked) and said all was good and tight. They could not find anything that could be causing this noise. They are really thorough and I can't believe they came up with nothing. It doesn't happen all the time This is the tricky part: sometimes the noise goes away. That's right, it goes away on it's own. I'll drive for 10 miles down the highway with this sound, then all of a sudden I'll be headed back the same way and I don't hear it. But then the next time I drive the car it's there. Other symptoms when I hear this noise: It seems like when I'm hearing this noise, the car is riding really bad, and something feels loose and not right at all. Bumps that feel soft when the noise isn't there now feel harsh. Other things to take note of: I thought it was the sway bar end links going bad so I replaced them with the GC ones, and they made no difference. When everything was first installed it was fine, and got worse over time. Right after the install of my second set of dampers, the noise was minimal, but after a few weeks got just as bad. Something must have loosened up!? Noise is there regardless of damper settings, but when they're softer the car makes less noise, probably because they are able to soak up more of the bumps. If I go 120 on a race track or 70 on a highway, my steering is tight. I haven't noticed any degradation in responsiveness. In conclusion: I could easily spend $1000s replacing parts and paying $100/hr labor rates to figure this out but I can't do that so replacing parts "to see if it helps" isn't the route I want to go. If you have a reason why I should replace said part, then by all means share! Update (12/2/2015): I've replaced the camber plates with the street model, no difference. It cut down on NVH but still getting the same noise. I don't think it is the camber plates at this point. Anyways, help is appreciated. Thanks for reading Pic of when it was first installed Last edited by chris82; 12-04-2015 at 08:26 AM.. |
05-06-2015, 04:31 PM | #2 |
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Hey, I'm sorry to hear that you’re going through this. I hate when something is wrong with my car and I can't figure it out. I can't personally help you but they are two people on here that are gurus when it comes to suspensions. You might want to PM them and let them know what you’re experiencing. The names of the guy's I'm talking about are Fe1rx and mightymousetech. Good luck and I hope that you get that squared away!
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05-06-2015, 04:46 PM | #3 |
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Uh, thanks.
This is really hard to diag over the internet. But the first thing I would check is the sway bar bushings. Unlike every other bushing in the suspension, they are not bonded both inside and out to the item. The sway bar actually turns inside the bushing and they do wear. Even the SLIGHTEST amount of wear can make a hell of a racket, will not be a metallic noise, more like a thud, and will be worse in the cold. Easy way to know is disconnect one of the sway bar end links and see if the noise goes away. If you pry on the bar at the bushing, and there is even the slightest amount of movement, they need replacing. Luckily, these are really cheap to do. |
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05-06-2015, 08:00 PM | #4 | |
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05-06-2015, 08:32 PM | #5 | |
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You commented in my post regarding the noise I was experiencing and it seems we are chasing the same animal. I was able to reduce the noise but it's still there. I noted it was about 90% gone but it's more like 70%. I realize we have different GC plates but our issues sound (no pun intended) similar. Like you I still have the OE control arms and it's my next step of replacement parts. I'm also replacing the swaybar bushings as a piece of mind. I'll be replacing these parts in the next two weeks so I'll let you know if it helped. If that doesn't solve it I'm ordering Vorshlag plates.
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05-06-2015, 09:06 PM | #6 | |
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05-07-2015, 07:44 AM | #8 |
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05-13-2015, 08:24 PM | #9 | |
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05-14-2015, 12:03 AM | #10 | |
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05-14-2015, 07:38 AM | #11 |
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Yea, give it a try. haven't had the chance to install mine, but for $20 a piece there's no point in not replacing them to try to solve it
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05-18-2015, 01:55 PM | #13 |
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06-04-2015, 07:39 AM | #14 |
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06-04-2015, 07:40 AM | #15 |
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06-04-2015, 07:48 AM | #16 |
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Camber plate bearing can be an unusual suspect. Put a GoPro or something in the engine bay and watch the bearing when you drive. If you see it moving about and making noise, bam, you found it. The camera helps you to see and hear while driving. It's a bit tricky to mount it safely.
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06-04-2015, 08:04 AM | #17 | |
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this is a tricky one . . . |
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06-08-2015, 02:41 PM | #18 | |
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How are the rest of the rubber bushings on the front-end of the vehicle? I can't be 100% certain as I am diagnosing this over the internet with supplied information. Good luck. |
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06-08-2015, 03:30 PM | #19 | |
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Koni are known for a good ole rattle/clunk with compression and rebound turned down. Turn the knobs a bit, drive around and it will disappear. |
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06-08-2015, 03:49 PM | #20 |
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I have been mulling this over in my head, it must be either the upper mounts or something inside the shocks.
On a related note, I believe I am starting to get noise from inside my own original front struts dammit. Replaced front strut upper bearings, noise still there. Again, this is very hard to diag over the internet and not hands on. |
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06-08-2015, 07:21 PM | #21 | |||
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I turned the rebound up another 5 clicks so that's a little over halfway. Seems to have improved things a lot. Still some noise, but it was very quiet on my commute home. I can live with it as long as it stays this way. Ride has also improved Quote:
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