[BIGW0RM]

Ever since I got my m2, I’ve heard this strange humming like resonance. It took me awhile to narrow it down. But it happens exactly between 62mph and 70mph under light throttle. If I lift off the gas, it immediately stops. I can modulate the throttle inbeteeen 62mph and 70mph make it sound off or stop. Only happens between 62-70mph.

It doesn’t get louder the faster I go. There are zero vibrations. My car is recently aligned. And it’s done this since day one.

It’s very hard to capture on iPhone. But if you listen closely. Towards the end (first clip) you’ll hear the sound. It sounds very similar to blowing air across a bottle.

Does anyone have any suggestions on what this could be? Does yours do this? Is this normal? I’m left wondering if this is my fuel pump or diff. But I’m just guessing.

Also, m sound on or off makes no difference. Exhaust valves open or closed makes no difference. Happens in all engine modes. Radio on or off makes no difference. Ac on or off makes no difference. Rpm doesn’t make a difference either. I can do it in 7th or 8th. It’s mph dependent only. 62-70mph.

My car is 1500 miles old.

https://youtube.com/shorts/dwuxpSSLZ...BlyIJ1MztwR6OY


Here is a better clip with a noise canceling microphone. It kills most of the other in car sounds, but you can clearly hear the hum like noise I am hearing. Its NOT this loud in the car. This mic just picked it up much better.

https://www.youtube.com/shorts/dv8K2XkbPNk

[RockCrusher]

Originally Posted by BIGW0RM

Ever since I got my m2, I’ve heard this strange humming like resonance. It took me awhile to narrow it down. But it happens exactly between 62mph and 70mph under light throttle. If I lift off the gas, it immediately stops. I can module the throttle inbeteeen 62mph and 70mph make it sound off or stop. Only happens between 62-70mph.

It doesn’t get louder the faster I go. There are zero vibrations. My car is recently aligned. And it’s done this since day one.

It’s very hard to capture on iPhone. But if you listen closely. Towards the end (first clip) you’ll hear the sound. It sounds very similar to blowing air across a bottle.

Does anyone have any suggestions on what this could be? Does yours do this? Is this normal? I’m left wondering if this is my fuel pump or diff. But I’m just guessing.

Also, m sound on or off makes no difference. Exhaust valves open or closed makes no difference. Happens in all engine modes. Radio on or off makes no difference. Ac on or off makes no difference. Rpm doesn’t make a difference either. I can do it in 7th or 8th. It’s mph dependent only. 62-70mph.

My car is 1500 miles old.

https://youtube.com/shorts/dwuxpSSLZ...BlyIJ1MztwR6OY


Here is a better clip with a noise canceling microphone. It kills most of the other in car sounds, but you can clearly hear the hum like noise I am hearing. Its NOT this loud in the car. This mic just picked it up much better.

https://www.youtube.com/shorts/dv8K2XkbPNk

The car has 1500 miles on it. Has it been in for its 1200 running in service? Besides an oil/filter service the diff fluid is changed.

Are the tires properly inflated?

If the tires are unidirectional are they mounted in the right direction?

Some road surfaces are quite noisy. Around where I live/drive there are sections of I49 on which the M2 tires would sing. (Now the M8 tires sing...) Other sections result in different noise, lower frequency noise. And some sections of road result in minimal noise.

If the noise arises from something mechanical it should be present on on all roads.

You say the car was recently aligned? What are the alignment settings? Specifically I would look at the rear toe in settings. Too much toe in or toe out can make for noisy tires. (And accelerate tire wear like you won't believe.)

[BIGW0RM]

Originally Posted by RockCrusher

The car has 1500 miles on it. Has it been in for its 1200 running in service? Besides an oil/filter service the diff fluid is changed.

Are the tires properly inflated?

If the tires are unidirectional are they mounted in the right direction?

Some road surfaces are quite noisy. Around where I live/drive there are sections of I49 on which the M2 tires would sing. (Now the M8 tires sing...) Other sections result in different noise, lower frequency noise. And some sections of road result in minimal noise.

If the noise arises from something mechanical it should be present on on all roads.

You say the car was recently aligned? What are the alignment settings? Specifically I would look at the rear toe in settings. Too much toe in or toe out can make for noisy tires. (And accelerate tire wear like you won't believe.)

Yes, Its been making this sound since day one. It took me some time to figure out what it was. Where I live, the normal commute is 45-55MPH and I dont get much highway time to hit over 65MPH. But one day I realized it was happening at exactly 62MPH. And that was after my break in service at 900 miles, which they did change the diff fluid. Since I didnt hear it after the first service, I assumed it was just the diff oil change that solved it. But I was wrong. Its still there.

It doesnt matter what road type Im on. Smoother roads only make it easier to hear. My tires are inflated to 32PSI all around per the door card. And this sound is purely dependent on me giving it light gas while in the MPH range of 62-70MPH. If I lift off the gas it immediatly stops. If I go into netural while going 62-70MPH, it stops. If I coast (no gas) it stops. Its only happening when on the gas specifically between 62MPH and 70. I can hear it in 6th, 7th, 8th gear. The higher the gear the easier it is to hear the hum since the engine and exhaust tone down due to lower RPMs.

Alignment wise, I dont have a print out. But Ive had it done twice now. The dealer did it once for me because my steering wheel was crooked. And then I installed KW HAS lowering kit and had the alignment done a 2nd time. So Ive had two alignments in a couple months time.

The sound sure does seem to be coming from the middle rear area. So this has me wondering its my drive shaft, my diff, or maybe my fuel pump. I dont know. Im guessing.

All my P zeros tires are on properly. Nothing out of line in that department. Ive had Pzeros three times now in two G80's and now in my M2. So Im familure with them. I dont like them, but I know them enough now.

At this point, I will most likely go to the dealer and have a shop foreman go for a ride with me to show him. It just sucks because I know they will most likely immediatly point to my KW HAS and say thats causing it.

I thought it went away after my first service. So I felt safe lowering it. But come to find out, it was still there once I realized it was between 62-70MPH.

I dont know if this is normal or not. This is my first M2. But my past G80 M3's didnt do this. So it has me worried something is not right. Or hopefully its just a characteristic of the car that my ears pick up.

So if anyone gets in there auto M2 today and can test to see if there car makes a hum like howl (think blowing air across a bottle top) around 62MPH to 70MPH, I would greatly appreciate it. Turn your radio off, exhaust button off and listen closely. You might hear it hum once you hit 62MPH, lift off gas and it stops. Give it gas to keep it above 62MPH and you might hear it.

That is, if this is a normal sound. But Im starting to think I might have an issue. But who knows. I'l get to a dealer soon.

Car drives completely normal otherwise. But it has my OCD going crazy wondering WTF is it.

[Tag]

Do you have PPF by any chance? I once had an edge peel up that made a humming sound at higher speeds. Drove me nuts trying to figure out where it was coming from. Rolled down the window and had an ah ha moment.

[BIGW0RM]

Originally Posted by Tag

Do you have PPF by any chance? I once had an edge peel up that made a humming sound at higher speeds. Drove me nuts trying to figure out where it was coming from. Rolled down the window and had an ah ha moment.

No sir I do not. But I did add grill mesh to my front radiator. I thought about removing it to see if thats whats causing it. But I just find it strange that the sound is ONLY when I tip in the throttle to keep speed between 62-70mph. And it sure seems to sound like its from the middle rear area. I put down my seats to see if would get any louder. Or make it easier to hear and pinpoint the sound source location. But it didnt help or make a difference.

[Bumpinjeep]

Weird. I would probably take it to the dealer to try to diagnose what's going on. You shouldn't be dealing with weird ass noises on your new BMW.

[fangelov]

On a different car I had, I was having a very similar issue. It turned out the rear differential was the culprit. It was replaced under warranty and the issue never happened again for over 100k miles.

[stueyyy]

I thought I was going crazy, but after reading OP’s description and listening to the first video, I think I have the same phenomenon.

Also a 2025 M2 auto, but 500 km to go until break-in service.

I took the car on a mini road trip up rural roads this past weekend, and I noticed what I’d describe as a faint, fairly high-pitched ‘whine’ that comes in at exactly 100 km/h (62 MPH), and fades away by about 110 or so. The sound is there only under load, in any gear, and increases in pitch slightly with speed, but not with load. Off the throttle, the sound is gone.

At first I thought it was electrical noise, but now I’m thinking it’s driveline or diff? It was a cold day (-10C), so I chalked it up to that, but I plan to mention it to my SA when I take it in for break-in.

[AZG87]

Long shot, but on a previous car I did a carbon fiber drive shaft that did a slight hum / vibration between 81-86 specifically but not above or below. Reinstalled it and this subsided. Just wondering if oem could do this with something loose needing to be reseated. Only mention it due to the specific speed requirements for it to happen.

[BIGW0RM]

Originally Posted by stueyyy

I thought I was going crazy, but after reading OP’s description and listening to the first video, I think I have the same phenomenon.

Also a 2025 M2 auto, but 500 km to go until break-in service.

I took the car on a mini road trip up rural roads this past weekend, and I noticed what I’d describe as a faint, fairly high-pitched ‘whine’ that comes in at exactly 100 km/h (62 MPH), and fades away by about 110 or so. The sound is there only under load, in any gear, and increases in pitch slightly with speed, but not with load. Off the throttle, the sound is gone.

At first I thought it was electrical noise, but now I’m thinking it’s driveline or diff? It was a cold day (-10C), so I chalked it up to that, but I plan to mention it to my SA when I take it in for break-in.

Thank you for posting this! This makes me feel much better. I also thought it was electronic noise at first too. Hopefully this is just a characteristic of the car. Please keep us posted. I’d prefer not to take my car to the dealer since I’m now lowered. I know they’ll just immediately blame that and not offer much help.

[two_three_two]

crazy idea... have you disabled ASD?

[BIGW0RM]

Originally Posted by two_three_two

crazy idea... have you disabled ASD?

I’ve turned it off in car. I have valve controller and I can open it close the exhaust too. No difference.

[two_three_two]

Originally Posted by BIGW0RM

I’ve turned it off in car. I have valve controller and I can open it close the exhaust too. No difference.

gotcha. sorry man, this is bewildering. sounds like it has to be driveline related then and based on middle/back i'm going differential. sadly seems like a dealership issue now and they will likely try to blame the KW.

[BIGW0RM]

Originally Posted by two_three_two

gotcha. sorry man, this is bewildering. sounds like it has to be driveline related then and based on middle/back i'm going differential. sadly seems like a dealership issue now and they will likely try to blame the KW.

Yup. I can always try and or I’ll just go to an independent shop. But now that another member has heard it, I feel much better! Lol.

[stueyyy]

Originally Posted by AZG87

Long shot, but on a previous car I did a carbon fiber drive shaft that did a slight hum / vibration between 81-86 specifically but not above or below. Reinstalled it and this subsided. Just wondering if oem could do this with something loose needing to be reseated. Only mention it due to the specific speed requirements for it to happen.

Hmm, interesting. In my case, there is no detectable vibration I can feel…and I called it a ‘whine’ because my ear isn’t really picking up any low frequencies to it (it’s not like a exhaust drone, for example).

My car is absolutely bone stock. I find it suspicious that it happens at exactly 100 km/h… my gut feeling is that it’s a resonant frequency that’s characteristic of car.

OP, what conditions were you in when you heard it? I don’t think I was fully at operating temps when I heard it. I’ll try to go out again when it’s a little warmer and see if I can reproduce it.

[Tag]

Originally Posted by stueyyy

I thought I was going crazy, but after reading OP’s description and listening to the first video, I think I have the same phenomenon.

Also a 2025 M2 auto, but 500 km to go until break-in service.

I took the car on a mini road trip up rural roads this past weekend, and I noticed what I’d describe as a faint, fairly high-pitched ‘whine’ that comes in at exactly 100 km/h (62 MPH), and fades away by about 110 or so. The sound is there only under load, in any gear, and increases in pitch slightly with speed, but not with load. Off the throttle, the sound is gone.

At first I thought it was electrical noise, but now I’m thinking it’s driveline or diff? It was a cold day (-10C), so I chalked it up to that, but I plan to mention it to my SA when I take it in for break-in.

What tires did your car come with?

[///MoT]

BIGW0RM I too have a '25 auto, gonna try to replicate this over the next few days, just to have another example to go by. Will let you know what I find asap.


-Tom

[KC87ZB]

Originally Posted by BIGW0RM

I’ve turned it off in car. I have valve controller and I can open it close the exhaust too. No difference.

I saw your response. Have you fully disabled ASD? Not just the button in the car but coded it out. You could be getting sound system fake burble noise. I have a manual so RPM's are different so I am not experiencing the same thing.

[BIGW0RM]

Originally Posted by KC87ZB

I saw your response. Have you fully disabled ASD? Not just the button in the car but coded it out. You could be getting sound system fake burble noise. I have a manual so RPM's are different so I am not experiencing the same thing.

I have not. But thats a good suggestion to try. I do know its sound Im hearing is the same volume regardless of it the interior ASD button is on or off. And its the same volume regardless of any engine mode Im in. Its easier to hear with the car as quiet as can be.

But that suggestion is worth a shot! The thought of it being electrical feedback did cross my mind.

I'll look into trying that. Thank you.

[NoMoreVW]

Do you happen to have aftermarket subs under the seats?

[BIGW0RM]

Originally Posted by NoMoreVW

Do you happen to have aftermarket subs under the seats?

No sir. No mods other than a mild KW HAS drop.

[NoMoreVW]

Roger that. I had a resonance issue that was caused from aftermarket subs.