[CnSky]

Wow is this on 18 19 or 20s or all size alloys.

Did they all have the same tyre manufacturer on them?

All run flats?

[Brucelinc]

I am not sure if the suspension calibration varies by country but I have driven 3 M550s...a '19, a '20 and now my '22....all USA spec. None of them had vibration. I am very sensitive to ride quality and am quite impressed with the smoothness.

[Haradrim]

Here by the list i drove

Mine: 5.20i luxury line, 18rims with bridgestone turanza er300 (my car came from factory with pirelli p7 cinturato, on this tyres the problem at 100-150km/h after change to bridge stone 130-150km/h problem)
Dealer gave me: 5.20i luxury line, 18 rims bridgestone turanza er300
My Friend's car: 5.20i luxury line, 18rims bridgestone t005
Other friend: 5.20i m sport package, 19 rims bridge stone t005

All of the vibrates.. Its very shame for BMW. And the car which dealer gave me had this changes

-drive shaft
-rims
-rear diffrential
-rear axis
-all rear suspension

didnt event decrease %1 on vibration..

Originally Posted by CnSky

Wow is this on 18 19 or 20s or all size alloys.

Did they all have the same tyre manufacturer on them?

All run flats?

[CnSky]

Bridgestone tyres maybe?

Aren't Turanza all season.

[Haradrim]

I thougt same

But Pirelli also had same issue..

Originally Posted by CnSky

Bridgestone tyres maybe?

Aren't Turanza all season.

[CnSky]

How many Pirelli shod cars did you drive

[Haradrim]

Only my car

Originally Posted by CnSky

How many Pirelli shod cars did you drive

[CnSky]

Put Michelin PS3 on bet it fixed the issue.

[Haradrim]

Originally Posted by CnSky

Put Michelin PS3 on bet it fixed the issue.

i wish to put but its no so certain and will be extra spend for me.

I am thinking to do dynamic balance, what you think?

[CnSky]

You definitely should have done road force already and ensured that the company uses a 5 pin balance lock not a cone lock.

Like below.

https://www.amazon.com/MR-CARTOOL-Un.../dp/B08R5BNT16

[SctsOut06]

I can tell you I just switched from Pirelli Runflats to Conti DWS non-rft and I still have the vibration.

More pronounced on certain road surfaces but always at the same speed.

[CnSky]

Wondering did an IStep update come out in Early 2021 that is causing a problem.

Reason think that is my car had major issues with vibrations and in the end some modules were at fault they were not broken just bad coding. I bought my car and updated iStep in January 2021 at BMW and started noticing the issue then. The same I step was likely on all cars delivered January to August that year.

Solved mine by recoding VDP (specific to variable dampers) and the ACSM which is on all cars and controls sensor network.( if sensor network is bad (flexray)then all sensors to for example transmission etc will be off)


As a last gasp effort I would advise having a remote coder blank your Acsm and recode only it and the VDP if you have variable dampers. Only cost 100 bucks. I used kubax on here you need a laptop and a Bluetooth or cable to connect.

It worked in my case.

[SctsOut06]

Originally Posted by CnSky

Wondering did an IStep update come out in Early 2021 that is causing a problem.

Reason think that is my car had major issues with vibrations and in the end some modules were at fault they were not broken just bad coding. I bought my car and updated iStep in January 2021 at BMW and started noticing the issue then. The same I step was likely on all cars delivered January to August that year.

Solved mine by recoding VDP (specific to variable dampers) and the ACSM which is on all cars and controls sensor network.( if sensor network is bad (flexray)then all sensors to for example transmission etc will be off)


As a last gasp effort I would advise having a remote coder blank your Acsm and recode only it and the VDP if you have variable dampers. Only cost 100 bucks. I used kubax on here you need a laptop and a Bluetooth or cable to connect.

It worked in my case.

You're saying recoding these two modules fixed your issue? Were you getting vibrations at the same speeds?

[CnSky]

I was getting vibrations and instability everywhere including motorway harmonic vibrations.

My wheels were non centric so changed them.

My VDP was coded wrong so replaced and recoded it.

Car still had weird vibrations especially from the rear.

Changed to PS3 tyres helped a lot.

Finally coded the ACSM all solved.

Just to make it very clear how important the ACSM is it runs the flexray network. If it's off even slightly it truncates all the sensor date in the car, that can affect everything from dampers to transmission to steering.

And to point out BMW couldn't fix the car or figure out what was wrong, I ended up figuring it out over 12 months by myself with ISTA and an engineers approach to testing. Also cost me a fortune following BMWs idea which were all wrong.

They didn't have a clue how the systems work so my advice is just try it l, you cant do any harm recoding the ACSM or VDP if it's done by someone like KUBAX and it's only 100 bucks if it doesn't fix the problem.

[Haradrim]

I forgot the add something, when i am at low speeds like 30-40km/h if i pass through rough road, the back of the car vibrates for a sec like 140km/h

I will check my rims is centric or not this week.

[SctsOut06]

Originally Posted by CnSky

I was getting vibrations and instability everywhere including motorway harmonic vibrations.

My wheels were non centric so changed them.

My VDP was coded wrong so replaced and recoded it.

Car still had weird vibrations especially from the rear.

Changed to PS3 tyres helped a lot.

Finally coded the ACSM all solved.

Just to make it very clear how important the ACSM is it runs the flexray network. If it's off even slightly it truncates all the sensor date in the car, that can affect everything from dampers to transmission to steering.

And to point out BMW couldn't fix the car or figure out what was wrong, I ended up figuring it out over 12 months by myself with ISTA and an engineers approach to testing. Also cost me a fortune following BMWs idea which were all wrong.

They didn't have a clue how the systems work so my advice is just try it l, you cant do any harm recoding the ACSM or VDP if it's done by someone like KUBAX and it's only 100 bucks if it doesn't fix the problem.

Great - could you send me contact info on who did the coding for you?

[CnSky]

Kubax86 on here did it for me from Poland but I'm sure there are others state side.