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BMW 5-Series (G30) Forum 2017+ BMW 5 Series (G30) General Discussions G31 Suspension resonance noise

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      10-12-2018, 01:19 PM   #1
Gee195
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G31 Suspension resonance noise

G31, standard suspension, 17" non runflats.

On worn concrete roads (90% here in Belgium) the suspension makes , besides the normal suspension noise, a very low frequency resonance sound, as a low bass frequency.

It's most noticable on low speeds, below 60 km/h, getting worse coming to a stop. On smooth asphalt, there is no resonance.

It is driving me mad, never experienced this with any ( and a lot cheaper) other car. Even my 13 year old Ford Focus was limousine comfort compared to this car. Overall comfort of the suspension and sound level of this car is very disappointing, not at a level you would expect from a 5-series.

We test drove a g30 berline, no resonance; another g31 with 19" run flats : more tire roar but no resonance ...

Several wheels tested, front bearings changed, no difference.

A engineer from BMW Belgium did a long testdrive, to come to the conclusion this is normal noise, due to the excessive use of aluminum and weight savings Is it maybe common BMW policy, just denying the issue?

Any similar experiences?
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      10-12-2018, 01:47 PM   #2
HighlandPete
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Quote:
Originally Posted by Gee195 View Post
G31, standard suspension, 17" non runflats.

.

We test drove a g30 berline, no resonance; another g31 with 19" run flats : more tire roar but no resonance ...

Several wheels tested, front bearings changed, no difference.

A engineer from BMW Belgium did a long testdrive, to come to the conclusion this is normal noise, due to the excessive use of aluminum and weight savings Is it maybe common BMW policy, just denying the issue?

Any similar experiences?
No experience... are you sure it is suspension related? As the other cars didn't resonate and wheel changes made no difference, I'd be looking to things like heat shields, engine acoustic cover, undertrays, etc., as the first things to check.

As to BMW 'policy' and denying an issue, not sure others are having issues with these near silent cars. The other two examples you have tried not having a problem is a clue there is something unusual going on.
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      10-13-2018, 04:36 PM   #3
Gee195
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I will pass your suggestions to my dealer. I don' t know if there is an issue with the suspension, but it seems to me the suspension movement is creating the vibration and resonance. It' s frustrating BMW Belgium is not more pro active ...
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      10-13-2018, 04:40 PM   #4
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Quote:
Originally Posted by HighlandPete View Post
No experience... are you sure it is suspension related? As the other cars didn't resonate and wheel changes made no difference, I'd be looking to things like heat shields, engine acoustic cover, undertrays, etc., as the first things to check.
Tyres.

Check a similar car, with a different tyre make and also with a different width.
I remember thinking I had a differential issue this summer while steaming on autobahn, just to drive there two months later, with a different car, but same brand of tyres (Michelin) albeit different products (Cup 2 vs Primacy 3RFT) and experiencing the same sound. My friend on one of the occasions, riding on Pirellis, thought I was hearing noises in my head.
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      10-14-2018, 08:06 AM   #5
Gee195
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Unfortunately it's not the tyres, nor the rims.

We tested several different wheelsets with different tyres : 17", 19", rft, non rft, summer, winter ... No difference.

We tested the same wheelsets on another 520d sedan: no resonance sound.
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