[mfarrzhp]

I think it could be simply intake noise, but it has more of a metallic noise than I'm used to with intake noise. I notice it around town when gently accelerating from 1500 RPM or so and only for a brief second. This is with the windows down as well, so it's not extremely noticeable.

Just wondering if others have noticed it, or if it may be some kind of issue?

[medphysdave]

I haven't noticed anything.

[mchart]

It just sounds like a DI engine to me. Nothing unusual. Fairly standard loud injectors and mechanical HPFP.

[dsforman13]

Originally Posted by mfarrzhp

I think it could be simply intake noise, but it has more of a metallic noise than I'm used to with intake noise. I notice it around town when gently accelerating from 1500 RPM or so and only for a brief second. This is with the windows down as well, so it's not extremely noticeable.

Just wondering if others have noticed it, or if it may be some kind of issue?

haven't noticed it. if its a grinding type of noise i have no idea. If its more of a ticking noise its probably the Injectors. Again, i haven't noticed on this car but my previous car Merc C63S i heard it all the time especially with the windows down. Gotta Fuel that V8. Even this car is Thirsty.

[mfarrzhp]

Originally Posted by dsforman13

haven't noticed it. if its a grinding type of noise i have no idea. If its more of a ticking noise its probably the Injectors. Again, i haven't noticed on this car but my previous car Merc C63S i heard it all the time especially with the windows down. Gotta Fuel that V8. Even this car is Thirsty.

It's more of a grinding but ever so slight, definitely not a ticking. Could just be turbo spooling? Again it's very specific to low RPM and a short 1/4 to mid throttle push and goes away after 2K RPM or so.

I don't have the ceramic brakes.

[ptgltw]

It isn't in the drivetrain? Definetaly from under the hood?

[Wah]

rattling exhaust valves?

[mfarrzhp]

I think I'm just being paranoid. It's definitely there, but may just be the intake and exhaust giving out noise at the same time. Really only hear it with the windows down and noise bouncing off of buildings in town.

Maybe it's a slight exhaust valve rattle. I do keep it in Sport+ all the time. But then I would think it wouldn't go away at higher revs.

I'm sure it's nothing to be concerned about.

[f80_MG]

Originally Posted by mfarrzhp

I think I'm just being paranoid. It's definitely there, but may just be the intake and exhaust giving out noise at the same time. Really only hear it with the windows down and noise bouncing off of buildings in town.

Maybe it's a slight exhaust valve rattle. I do keep it in Sport+ all the time. But then I would think it wouldn't go away at higher revs.

I'm sure it's nothing to be concerned about.

Is it possible to record it or is it not loud enough to be easily recorded?

[mfarrzhp]

Originally Posted by f80_MG

Is it possible to record it or is it not loud enough to be easily recorded?

Probably would be hard to discern with a video from my phone, but maybe I'll have my wife record while I drive later to see if it gets captured.

[ptgltw]

I've been there before. Driving thru buildings saying...oh shit, my car sounds like that! Never knew.

I'm sure it's nothing but have that nothing confirmed at your break in service.

[maxxfish]

Exhaust heat shields tend to vibrate at certain RPMs and make a disconcerting sound....

[MadBimmeRad]

Originally Posted by ptgltw

I've been there before. Driving thru buildings saying...oh shit, my car sounds like that! Never knew.

I'm sure it's nothing but have that nothing confirmed at your break in service.

Check your LSD

[ptgltw]

Originally Posted by MadBimmeRad

Check your LSD

Who me? I don't have an issue with the CS...at least not yet. It is a BMW after all

[MadBimmeRad]

Originally Posted by ptgltw

Who me? I don't have an issue with the CS...at least not yet. It is a BMW after all

From what I've read, when the noise presents itself and becomes more apparent over time, one should get the LSD checked - there have been cases reported with faulty diffs that have had to be replaced. These are not necessarily track cars either.

If you hear a whistling metallic noise, it might be the diff (though it might also be something else entirely but it wouldn't hurt getting your local dealership to include the LSD in their list of items to check when investigating).

Apparently in some instances the warning sign lights up in the display cluster but not in all instances. In one case that I read about, the problem occurred well before the first break-in service after only a few days on the road.

This problem was apparently also noted with the F82s where the LSD was originally used in

[AxM2CS]

Originally Posted by maxxfish

Exhaust heat shields tend to vibrate at certain RPMs and make a disconcerting sound....

Concur heat shielding rattling would be a leading candidate .. get that all the time when driving by buildings or Jersey barriers in my 02 540i

[Got f1?]

Wondering if you are hearing the noisy pilot bearing? Not sure if you have a 6spd

[mfarrzhp]

Originally Posted by Got f1?

Wondering if you are hearing the noisy pilot bearing? Not sure if you have a 6spd

It is a 6 speed. I haven't really noticed it lately. I guess I've been pushing it a bit harder.

[TBURKE555]

Sounds like the soda can crunch from the OG M2. Just heard the sound in my 2021 M2C . Maybe you are hearing the same thing. Never an issue in my OG M2. Drove over 40k before trading for a Comp

[mfarrzhp]

Originally Posted by TBURKE555

Sounds like the soda can crunch from the OG M2. Just heard the sound in my 2021 M2C . Maybe you are hearing the same thing. Never an issue in my OG M2. Drove over 40k before trading for a Comp

I'll have to look that up.

I had the windows down and did a fairly hard launch from a light to 4500 rpms or so due to a tight merge. Not floored, but maybe 70% in sport plus. It was loud that time and right as the clutch engaged. The sound lasts just under one second.

I'll definitely have it checked during the break in service.

[XutvJet]

Originally Posted by mfarrzhp

I'll have to look that up.

I had the windows down and did a fairly hard launch from a light to 4500 rpms or so due to a tight merge. Not floored, but maybe 70% in sport plus. It was loud that time and right as the clutch engaged. The sound lasts just under one second.

I'll definitely have it checked during the break in service.

It's the dual mass flywheel. Lots of 6MT owners of the M235 and M2 have noticed this sound. It's sometimes more prevalent when the motor is warmed up, all windows up, and the radio off.

I noticed the sound when my car was barely 6 months old. It was a little unnerving to me to because it sounded like a spun rod bearing, but a lot more muted. That was 4.5 years ago now and the flywheel still makes the same sounds. The motor runs strong as ever. No issues with all of the drivetrain.

[MadBimmeRad]

Originally Posted by XutvJet

It's the dual mass flywheel. Lots of 6MT owners of the M235 and M2 have noticed this sound. It's sometimes more prevalent when the motor is warmed up, all windows up, and the radio off.

I noticed the sound when my car was barely 6 months old. It was a little unnerving to me to because it sounded like a spun rod bearing, but a lot more muted. That was 4.5 years ago now and the flywheel still makes the same sounds. The motor runs strong as ever. No issues with all of the drivetrain.

The thing I most love about your post is your signature; how incredibly true is that? What an eye opener



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