Clunk sound from F10 M5 rear on bumps

[RNH]

Hi Guys,
my car is late april production (MY 2013) and I have never experienced this sound and at delivery I asked the dealer about this issue and they said they never heard about it. The road are pretty smooth here alot of speed bumps though but till now never heard the "clunk". Do you think bmw will do an official recall when the issue is solved, or you think its already solved?

[M-bitious]

I could hear the clunk sound ever so lightly, but after installation of the H&R springs it's gone completely quiet. Same like the guy with the Schnitzer springs. I guess we can say we know what it is, and how to solve it yourself.

[nordic@telia.com]

Originally Posted by M-bitious

I could hear the clunk sound ever so lightly, but after installation of the H&R springs it's gone completely quiet. Same like the guy with the Schnitzer springs. I guess we can say we know what it is, and how to solve it yourself.

Hi, are you satisfied with the H&R springs? Do you have some photos to show the result?
I had H&R on my 550Xi and they worked very well on that car.

[M-bitious]

Yes I am very pleased with them. There is another thread with pics of my "modified" imperial blue M5.

[nordic@telia.com]

Originally Posted by M-bitious

Yes I am very pleased with them. There is another thread with pics of my "modified" imperial blue M5.

Yes i saw that today, looks great

[visualguy]

Originally Posted by AM47

I have the rear suspension clunk, I heard it the first day. I will get the dealer on it at first service.
My car was built week of March 26th, so as of that date BMW has not addressed it at the factory level.

Quite disturbing. I don't understand how they could miss a fairly obvious problem like this...

Since it's not clear when they'll start using the new coil springs in production, I'm thinking about canceling my order for now, and waiting until there's some clarity on this issue.

[sham]

Singularity: Have i spotted the clunk in the following video????
Look at 2:48 and tell me if it is, what i think it is? Is that the clunk?


PS: 1 week till delivery

[visualguy]

I think this car hit the underside of its front skirt on the road going too fast on that speed bump.

[Aussie F10M]

Yes. That is the front of the car scraping. That is not the clunk. I would be surprised if you would hear the clunk outside the car to be honest.

[singularity]

Originally Posted by sham

Singularity: Have i spotted the clunk in the following video????
Look at 2:48 and tell me if it is, what i think it is? Is that the clunk?


PS: 1 week till delivery

As visualguy and Aussie F10M said, the metallic sound in your video was not the 'clunk sound' but from the speed-bump. But I'm sure the driver of M5 in your video did hear the real 'clunk sound' himself when he drove over those speedbumps

Imagine you're driving a car with a heavy toolbox /a baseball bat/luggage in your trunk on uneven road surface - that's what the real 'clunk sound' sounds is like.

[visualguy]

Originally Posted by singularity

Imagine you're driving a car with a heavy toolbox /a baseball bat/luggage in your trunk on uneven road surface - that's what the real 'clunk sound' sounds is like.

What causes it? What's the defect in the rear coil springs or struts?

[Aussie F10M]

Apparently the rear coils are about 1cm too short and that gives them some rotational play - it is the rotation and hitting the stop which causes the noise (so I am told).

[visualguy]

Originally Posted by Aussie F10M

Apparently the rear coils are about 1cm too short and that gives them some rotational play - it is the rotation and hitting the stop which causes the noise (so I am told).

I see - thanks. Not good... Wouldn't this gradually damage the upper pad as the coil hits it again and again over time?

BMW seems to be doing too much testing on tracks and other perfect roads, and too little on rough roads... Still, you would think they would at least test the car a few times on some speed bumps.

I hope the coil springs in the 2013 model year production are good, but who knows - the problem was discovered only recently.

[megreli]

Hi) Unfortunatelly I have the same sound from rear part of my car((( when I went to my dealership they said, that it is normal for F10 and they can make nothing. Do they lie?
Help me)

[singularity]

Originally Posted by megreli

Hi) Unfortunatelly I have the same sound from rear part of my car((( when I went to my dealership they said, that it is normal for F10 and they can make nothing. Do they lie?
Help me)

Dealership can do nothing, we must wait until BMW releases replacement coils somewhere around December 2012 or buy aftermarket springs.

[Aussie F10M]

I think you mean 2012 rather than 2013 don't you singularity ?

[mhh]

No clunk at 2,000km. I keep waiting for it. Got an emissions warning light though....

[visualguy]

Originally Posted by mhh

No clunk at 2,000km. I keep waiting for it. Got an emissions warning light though....

I'm increasingly getting concerned that the bugs haven't been discovered and fixed on the F10 M5 yet...

[mhh]

Originally Posted by visualguy

I'm increasingly getting concerned that the bugs haven't been discovered and fixed on the F10 M5 yet...

Emissions light just went out. I've got a Ferrari that does this sort of thing occasionally. They usually fix themselves.

[singularity]

Originally Posted by Aussie F10M

I think you mean 2012 rather than 2013 don't you singularity ?

I apologize, yes I meant by the end of this year, so December 2012. Corrected it

[mr_yogi]

Originally Posted by visualguy

I'm increasingly getting concerned that the bugs haven't been discovered and fixed on the F10 M5 yet...

Of course the bugs haven't been fully discovered yet. That's always the case during a first year run.

[Marco28nl]

I picked up my new my new m5 this morning and everything is great except that i also have the clunk sound