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M2 Technical Topics > Suspension | Brakes | Chassis > Ohlins knocking

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      04-10-2020, 04:30 AM   #89
David.m
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This might be of interest to anyone with the dull knock at very low speed. I installed my Ohlins R&T a few days ago and straight away driving up my paved driveway (moderate incline) I had continual low volume knocking up front then some louder knocks as the front wheels went out onto the road (which I do carefully otherwise the car bottoms out). Reversing back down the drive I had the same knocking, driving forwards down the drive no knocking. Also no knocking driving on road, over speed bumps nor any issues on smooth concrete carpark surface. Problem seemed to be a combination of low speed, small undulations on road surface and low compression on suspension.

Anyway after a bit of stuffing around I discovered the cause of my knocking was slight movement of the springs when the top hats are rotating. With the wheels off, turning lock to lock there was a knock noise from the left spring every time it turned through the same spot. Using my hand I applied some side force to the spring as I pulled/pushed the steering through a full lock to lock. The spring noise was now gone. Wheels back on and driving up the driveway no knocking but did have a couple of very faint knocks as wheels went over onto road, but now very quiet compared to what they had been, hard to tell if it's left/right or both. If there is no further change in the next week or so I'll try moving the right spring while turning steering through it's range.

This probably explains why the oem springs have the big rubber seats at each end and the recess to hold the spring end. The flat ended Ohlins springs sitting on a flat plastic/rubber seat might be prone to slight movement at low compression until they settle into 'their' position. Another fix might be to increase pre-load but the downside of that I think would be a firmer spring rate at it's initial compression point.
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      04-10-2020, 11:08 AM   #90
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Lightbulb Bad bushings in Ohlins dampers

My knocking noise has finally been resolved!

I purchased and installed Ohlins R&T suspension in my 2017 M2 in April 2019. Immediately I noticed banging and knocking noises going over small bumps, when reversing, etc. and lived with the noises for 8 months since installation. I contacted Ohlins USA early this year and spoke with Brian Fowler and described the noises I was experiencing and even shared a link to this very thread! Brian advised he felt it might be the bushings within the front dampers and asked me to send them in.

After they were returned to me in March, I noticed the invoice had a comment that read, "Changed bushings. Checked internals and changed oil as part of a full inspection. Products amended as one-time customer goodwill." I called back to Ohlins and spoke to the service technician who had actually worked on my dampers, Carl Atkinson, and asked exactly what was done. He explained that Ohlins had put a new style bushing in their R&T dampers that was causing the knocks and bangs, and he simply replaced the bushings with the old style that were known to perform without issue.

The rebuilt front dampers have been reinstalled in my car for almost a month now and I haven't experienced any of the knocks or banging I was previously. I would say problem solved.

I'm still a bit pissed at Ohlins for having to pay my installer to remove and re-install my dampers and have another alignment done. I can't believe Ohlins had the balls to write, "one-time customer goodwill" on my invoice when it was clearly a warranty issue for a problem they were aware of and they should be reimbursing me (and everyone else) for labor charges!

Anyway, if you choose to go the same route you'll need to call and get a warranty form to complete to send yours in. Turnaround time from the time they received them to them shipping them back out was only a week. Timeframe of your purchase might be of importance if you are experiencing similar issues as I'm guessing there was a manufacturing period where they used the bad bushings before switching back to the old style.
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Last edited by nothingman; 04-13-2020 at 03:44 PM..
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      04-10-2020, 11:42 PM   #91
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nothingman thanks for posting the information and confirming what others have concluded to in this thread. I'm an Ohlins fan, used them on previous rides, and was my go to for the M2C however this thread steered me away. I just couldn't risk going through the issues especially when we don't have the same type of Ohlins support in Australia. Ended up going with a set of MCS instead costing twice as much.

I cannot believe Ohlins are not just reverting back to the old sleeve moving forward.

I know you are pissed that you had additional out of pocket expenses. The reality is no vendor will comp u for this. Just be happy u caught it sorta early and now u will drive the car without regretting u bought the coilovers.

So really just a thank you for letting us know.
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      04-12-2020, 04:09 AM   #92
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Thanks for the update! Do you think they’ve switched back to the old bushings? I’m definitely going to avoid them in the future if they didn’t switch back...
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      04-12-2020, 03:15 PM   #93
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Good to see theres finally a resolution to this... maybe Ill take mine out and send them in to get this shit fixed....
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