[PFDnorthhills]

Ragnarkov
My alignment shows no sign of being off. Tracks as expected, and additionally no steering wheel vibration from tires not being balanced correctly.
Thanks for your insight thoughts.

[JeffHou73]

Originally Posted by Ragnarkov

I was readying elsewhere that because of the suspension differences, bmws can tend to not go through a proper alignment at dealers. I know with old cars I had, if they weren't aligned properly, the would get vibrations at certain speeds and and bad roads.

like I've heard of people having to take their bmws in 2 or 3 times to finally get it right.

could that possibly be it?

I don't think the noise is related to an improper alignment.

However, it it is true, and I am a witness to it, many BMW dealers do not do proper alignments. This isn't necessarily related to the design of their suspensions but because BMW's alignment specs for alignment require the cars be weighted (approx 450 pounds) to lower the ride-height first, which changes the angles (front and rear camber and toe. In lieu of adding weights, BMW dealers also have the option to avoid using these weights by using BMW specific software that compensates different target specs for the non weighted vehicle. Some dealers do neither of these correctly and/or believe none of it is necessary.

The main purpose I understand for BMW publishing specs for a specific ride height is due to the fact, when BMW's increase speed they are aerodynamically pushed further down toward the road surface.

[freitz]

Okay so I think I hear what you are referring to. It almost sounds like wind noise. Mine can only really be heard at 40+ miles per hour. At first it sounded like passenger rear, sometimes I hear it on the drivers side. Very strange, hard to describe, and can't really hear it if I am not constantly looking for it.

If it is in everyone's car I would have think it is wind noise of some sort or wind passing through somewhere. My wife can't even hear it.'

I took back to the dealer they told me this is what the G01 sounds like, normal road/ wind noise. Could it just be engine noise?

I've had mine since last friday noticed this on day two. I don't think its anything to take the car back for. I think someone said their 428i has the same noise, leads me to believe its has to be a similar part creating the noise?

[freitz]

Originally Posted by octane71

in france some people have the same problem ... and one solution for all , it's a problem with the seal of the windscreen.....

Anyone confirmed this? I would assume if its a seal with the windscreen it would be on the X30i's as well?

[freitz]

Are we sure this isnt engine noise? Seems consistent across all x3 m40i’s

[JeffHou73]

Originally Posted by freitz

Are we sure this isnt engine noise? Seems consistent across all x3 m40i’s

It's definitely not engine noise. When you are driving, you can turn engine off by hitting the start/stop button 3-4 times...you can still steer the car....but the engine is off and the noise doesn't change. Restart while moving by just hitting start button one time... no need to press break for re-start.

I don't think its been confirmed to be in all M40i's, but I have not had an opportunity to drive another one...so hard to find any on lots around here.

[freitz]

Originally Posted by JeffHou73

It's definitely not engine noise. When you are driving, you can turn engine off by hitting the start/stop button 3-4 times...you can still steer the car....but the engine is off and the noise doesn't change. Restart while moving by just hitting start button one time... no need to press break for re-start.

I don't think its been confirmed to be in all M40i's, but I have not had an opportunity to drive another one...so hard to find any on lots around here.

Has anyone test drove other x3 m40i?

Anyone attempted to get this fixed? I road with a tech again and claims it is just the noise this car makes.

[Max Well]

Originally Posted by JeffHou73

This is related to an earlier post where I described a "nuisance noise" heard in the M40, not related to wind or tires or exhaust or engine. This noise begins at speeds above 25 mph, sounds like a rattle or gurgle (like an old coffee pot sitting on the stove when its percolating). The noise does not seem to vary with speed once it begins.

I am aware of three owners (including myself) experiencing this noise and am trying to determine how wide spread this might be. Is it possible there are only 3 M40's that make this noise or do all M40's make this noise and just consider it normal?

Please respond if you have the interest and time.

1. Do you have a 2018 X3 xDrive30i (4 cylinder) or X3 M40 (6 cylinder)?

2. What is your production date (found on the tag inside the driver's door) and plant location?

3. Are you experiencing this nuisance noise described above (not wind or tires)?
If so, please provide a description (its somewhat difficult to describe if it is what I am hearing!).

Any information would be helpful.

We have an X3 M40i, produced Oct 2017, NO noises (wind or otherwise) finding it a very quiet vehicle even at 80 mph highway speeds, 19" performance Yokohama RFTs, NO adaptive suspension. Hope you have success with your search for answers.

[Quick18]

Same here with 21" Bridgestone's. Coming from an M4 this car is very quiet. I also do not have any air leaks. I just took a 500 mile trip and found the car to be comfortable, quiet and fun to drive.

[JeffHou73]

Originally Posted by Quick18

Same here with 21" Bridgestone's. Coming from an M4 this car is very quiet. I also do not have any air leaks. I just took a 500 mile trip and found the car to be comfortable, quiet and fun to drive.

Quick18 - Thanks for your reply. We (the folks hearing "the noise" are not looking for any leaks as we don't believe this is a wind noise per se. But, I was curious if you have Adaptive Suspension or not. Seems people without AS possibly are having better luck...but its not conclusive...yet. Also, what is the production date stamped on the door tag? Thanks!

[Kief]

Originally Posted by Quick18

Same here with 21" Bridgestone's. Coming from an M4 this car is very quiet. I also do not have any air leaks. I just took a 500 mile trip and found the car to be comfortable, quiet and fun to drive.

Yeah, I'm wondering what others are using to compare how noisy their G01 is (more from that other Thread re: wind and tire noise)?

After I drive around in my M3 ZCP, and then drive our M40i, the X3 sounds quit and nothing atypical for a BMW.

[Kief]

Originally Posted by JeffHou73

Seems people without AS possibly are having better luck...but its not conclusive...yet.

As another data point, I have Adaptive Suspension and not the noise you describe.

[jakhlyki]

Hi all, my X3 M40i was built in March 2018.

20" Pirelli run-flats, summer tires.
Dynamic suspension
HK audio
And other probably non-relevant options.

Some observations:

1. It's most noticeable in the driver's seat, less bothersome in front passenger's seat, and even less so in the rear seats.
2. My wife can't hear it, in any seating position. This would suggest that the noise is possibly there in all the M40i cars, just that some of us are more sensitive to this sound frequency. This is definitely possible from a human physiology perspective.

I have not tried to put it in neutral to see if it could be a gear issue. Has anyone done this?

[Quick18]

Originally Posted by JeffHou73

Quick18 - Thanks for your reply. We (the folks hearing "the noise" are not looking for any leaks as we don't believe this is a wind noise per se. But, I was curious if you have Adaptive Suspension or not. Seems people without AS possibly are having better luck...but its not conclusive...yet. Also, what is the production date stamped on the door tag? Thanks!

Yes I have adaptive suspension. Production date is 3/6/18. I picked it up at the BMWPC on 3/23/18.

I'll admit that I did not expect it to be relatively quiet; however, it has been surprisingly so. Maybe I just got lucky.

[JeffHou73]

Originally Posted by jakhlyki

Hi all, my X3 M40i was built in March 2018.

20" Pirelli run-flats, summer tires.
Dynamic suspension
HK audio
And other probably non-relevant options.

Some observations:

1. It's most noticeable in the driver's seat, less bothersome in front passenger's seat, and even less so in the rear seats.
2. My wife can't hear it, in any seating position. This would suggest that the noise is possibly there in all the M40i cars, just that some of us are more sensitive to this sound frequency. This is definitely possible from a human physiology perspective.

I have not tried to put it in neutral to see if it could be a gear issue. Has anyone done this?

Thanks for you input.

I have tried putting car in neutral while moving and the noise doesn't change. I've also, as I've stated above, switched the engine off completely while moving and the noise is unchanged.

One trend may be playing out that units built in January may be more noticeable than some units produced in the fall or in March...but can't imagine what might be causing that. Not really enough data.

[DW_x3m40i]

Yanny or Laurel? :

[Ragnarkov]

Originally Posted by DW_x3m40i

Yanny or Laurel? :

LOL.

this has sadly been everywhere today...

... and I hear Laurel...

[freitz]

Originally Posted by JeffHou73

Thanks for you input.

I have tried putting car in neutral while moving and the noise doesn't change. I've also, as I've stated above, switched the engine off completely while moving and the noise is unchanged.

One trend may be playing out that units built in January may be more noticeable than some units produced in the fall or in March...but can't imagine what might be causing that. Not really enough data.

I haven't checked when mine was made I will do that when I can.

Here is what I noticed. My noise described I assume is the same, it is present at a stop light when the auto off has the engine off as well... I'm very confused now have not heard this before. Just got back after a week long business trip.

Noise present with Engine on or off. moving or not. Really throws a wrench into it. Maybe its normal noise.

_edit_

Important to note that noise is sometimes on passenger side towards rear (or so it sounds) or driver side toward the rear window. Again not only present when moving but also present when auto off kicks in on a stop light and not moving.

[abcsoup]

For my car:

1. 2018 M40i (21" 718M wheels, Bridgestone Alenza Tires, Adaptive M Suspension)
2. 2018-03-22, SC
3. No, I do not hear this noise.
4. N/A

[freitz]

Originally Posted by abcsoup

For my car:

1. 2018 M40i (21" 718M wheels, Bridgestone Alenza Tires, Adaptive M Suspension)
2. 2018-03-22, SC
3. No, I do not hear this noise.
4. N/A

I assume all the M40is would have adaptive M suspension?

[abcsoup]

Originally Posted by freitz

I assume all the M40is would have adaptive M suspension?

Unfortunately, no, the adaptive suspension is a $700 option. The M40i comes with a sport suspension as standard without any available dynamic damper settings.

[freitz]

Can anyone record this noise. I sure hope we are talking about the same thing. I really can only notice it if I focus for it. My wife can't even hear it.