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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Suspension | Brakes | Chassis > Bottoming Out on Bumps



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      06-10-2023, 12:10 AM   #1
Dynamics99
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Unhappy Bottoming Out on Bumps

Hi,

I recently installed MTS Technik Street suspension on my '11 335i which rides like a cloud but on some sharp bumps I feel like I'm bottoming out and worry I can damage my front control arms or subframe. The streets in Philadelphia aren't the best. I have 2 finger gap between the tire and the fender on the front and back and I'm on style 230 19-inch wheels. I replaced the sway bar end link with Meyle HD which has reduced some clunking sound as the original sway bar end link was too worn. Am I paranoid or am I experiencing a pothole explosion? I am scared to death when it happens. I feel like my front tires will blow. Usually over dips and small bumps, it rides normally.

Also, my sway bar bushings are bounded to the sway bar. Do I have to get a whole new sway bar to replace them? I couldn't pry it off with my fingers or a small pry bar.
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      06-16-2023, 07:52 PM   #2
Dynamics99
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Update:

Okay, I think it's the bump stops that are making that huge noise otherwise my front tires would have popped by now considering they don't rub or the subframe does not scrape as I'm not even lowered. What front shorter bump stops could I get?
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      06-16-2023, 08:08 PM   #3
mattanderson
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Did your suspension setup come with bumpstops matched to the kit?

I'd be skeptical that swapping around to random bumpstops would be any better than what came with the kit.
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      06-18-2023, 07:48 AM   #4
dmatre
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If you are crashing on the bump stops, then you donít have enough spring rate/shock damping for the weight/travel of your car.

Getting shorter bump stops will only result in even harsher crashes (same force, shorter distance for bump stop to act).

Lowering the suspension requires increasing the spring rate/compression damping in order to avoid bottoming out the shock/strut.
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      06-20-2023, 07:42 AM   #5
Dynamics99
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Quote:
Originally Posted by mattanderson View Post
Did your suspension setup come with bumpstops matched to the kit?

I'd be skeptical that swapping around to random bumpstops would be any better than what came with the kit.
It did come with its own bump stop. The spring system is progressive and not linear.
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      06-20-2023, 09:43 AM   #6
whyzee125
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It sounds like the springs are just too soft. The best riding setup I had was Tein S tech springs with Koni shocks (and e30 front hardware for an additional 19mm travel). It sounded just like you describe, fantastic ride quality, possibly better than stock on most terrain but big dips and imperfections would cause the front to slam into the bump stops and create the explosion noise in the strut towers. I haven't heard of that setup but I would look into something else that's tried and true if you can't live with it as is.
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      06-20-2023, 11:18 AM   #7
crashoverride
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I don't see any mention of the condition of your shocks. Are they new enough not leaking etc..??
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      07-03-2023, 06:43 PM   #8
gunnerxq
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The bump stops could be too long. I have Koni actives with eibach springs. They need all the travel they can get. I put on after market polyurethane bump stops. They were still too long so I cut them and the only part left is from the blue line up. The white one's are sport suspension bump stops.

Car drives like a dream.
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Koni special active red, eibach pro-kit springs, Remus exhaust, stage 3 intake manifold,Stage 2 AA tune, BMW Short shift kit. Silicon intake pipe. M3 control arms front, M3 rear. ECS trailing arm with whiteline bushings. Purple powerflex subframe bushings. Yellow power flex upper shock mounts. Single mass flywheel OE weight.
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