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2019+ BMW 3 AND 4-SERIES FORUMS (G2x Generation) General G20 Sedan / G22 Coupe / G26 Gran Coupe Discussions M340i wind noise

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      11-20-2019, 02:48 AM   #23
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Quote:
Originally Posted by Calamari View Post
I'm not sure if it's a standard option in North America, but I know it's not available as an option in North America. Also, I think BMW
marketing in NA would point this out in it's list of standard equipment if it was the case.

It's easy to check if front glass is acoustically isolated. One just needs to drop the frond window half way down, to look at the glass edge. Acoustic glass clearly shows a middle layer in between innner and outer glass surface if you look at it's edge.

Can someone from NA check if their front windows have this sandwich-like structure to resolve this dillema?
So I went to the dealer and saw a demo 330i, pretty base car. I was not planning on checking the windows, it was a pretty in and out thing, but when they opened the rear door the window was cracked a bit and I swear I saw a double glass.

I will need to go over again compare EU vs US cars to see.
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      11-20-2019, 07:11 AM   #24
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Quote:
Originally Posted by A6bullet View Post
So I went to the dealer and saw a demo 330i, pretty base car. I was not planning on checking the windows, it was a pretty in and out thing, but when they opened the rear door the window was cracked a bit and I swear I saw a double glass.

I will need to go over again compare EU vs US cars to see.
That's strange cause according to the EU spec - only front windows have acoustic glass option.

I'll check rear windows on my car as I have this option.
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      11-20-2019, 08:42 AM   #25
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Quote:
Originally Posted by Calamari View Post
That's strange cause according to the EU spec - only front windows have acoustic glass option.

I'll check rear windows on my car as I have this option.
I went to BMW diplomatic sales branch. They carry both EU and US spec cars. Ill have to go and verify again which one was it, though Im sure it had reflectors so it was NA spec
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      11-21-2019, 02:46 PM   #26
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Quote:
Originally Posted by A6bullet View Post
I went to BMW diplomatic sales branch. They carry both EU and US spec cars. Ill have to go and verify again which one was it, though Im sure it had reflectors so it was NA spec
Here are the images of front driver window and rear passenger window.

You can clearly see the layered sandwich construction of the front window.





Last edited by Calamari; 11-22-2019 at 05:00 AM..
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      11-21-2019, 11:23 PM   #27
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Originally Posted by Antec800 View Post
This is one of the quietest cars I’ve driven and I’ve driven 70k+ cars
I guess you would know! I imagine you've experienced nearly everything the automotive world has to offer, having driven that many cars.
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      11-22-2019, 01:19 PM   #28
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The road noise i get when driving on the HWY is based on the shitty run flat tires they put on these cars.

Such Tiny Little 225 series tires and Run Flats make them loud.

i wonder if this has anything to do with it.

I will say my 435i was quieter
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      11-23-2019, 10:40 AM   #29
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Sometimes

I occasionally get a whistle on the drivers side window. Not from the mirror. Sometimes I can eliminate it by lowering the mirror and raising it again... sometimes that doesn't help. Not much of a bother though... my music is usually up pretty high.
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      11-24-2019, 03:13 AM   #30
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Quote:
Originally Posted by M340Mike View Post
I occasionally get a whistle on the drivers side window. Not from the mirror. Sometimes I can eliminate it by lowering the mirror and raising it again... sometimes that doesn't help. Not much of a bother though... my music is usually up pretty high.
Me too!

I tried to find the source but no success for now. Should we investigate a little bit more and share the results? I noticed that I get it more when it's windy.
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      11-25-2019, 10:19 AM   #31
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Originally Posted by F30ZHP View Post
F30's have wind noise, G20's are vault like quiet.
That's an understatement. Wind noise, road noise, all sorts of noise in the cabin. It really wasn't enjoyable for my commute. The G20 is so much quieter.
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      11-25-2019, 10:23 AM   #32
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I have a G20 330i without insulated glass and even that suffers from horrible wind noise. I thought my B9 A4 was bad till I got this car. It is so much worse when it comes to wind noise. Probably the weird shape of the rear view mirrors and the creases on the hood directing wind to the mirrors? Honestly the B9 has so much less wind noise in comparison. Their ORVM design was amazing. Including fins on the ORVM caps to reduce noise and drag (I’m guessing)
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      11-25-2019, 10:48 AM   #33
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Quote:
Originally Posted by VipinLJ View Post
I have a G20 330i without insulated glass and even that suffers from horrible wind noise. I thought my B9 A4 was bad till I got this car. It is so much worse when it comes to wind noise. Probably the weird shape of the rear view mirrors and the creases on the hood directing wind to the mirrors? Honestly the B9 has so much less wind noise in comparison. Their ORVM design was amazing. Including fins on the ORVM caps to reduce noise and drag (Iím guessing)
G20 is one of the most efficient cars on the road with drag coefficient of just 0.23 (the same as Audi A4 B9).
I've driven B9 and my car is even quieter, or at least as quiet as B9. General opinion among owners and independent reviewers is that G20 is a very quiet car.

There must be something wrong with the rubber seals around your doors or windows. Get it checked in your service, cause in terms of wind noise this car is very quiet even above 160kmh.
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      11-25-2019, 06:01 PM   #34
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Quote:
Originally Posted by Calamari View Post
G20 is one of the most efficient cars on the road with drag coefficient of just 0.23 (the same as Audi A4 B9).
I've driven B9 and my car is even quieter, or at least as quiet as B9. General opinion among owners and independent reviewers is that G20 is a very quiet car.

There must be something wrong with the rubber seals around your doors or windows. Get it checked in your service, cause in terms of wind noise this car is very quiet even above 160kmh.
I had an A4 B9 for 3 years until last week. I had both cars together with me for 2 weeks. And I definitely noticed that my 330i has more wind noise than my A4.
I haven’t driven another 330i so I can’t compare. I’ll definitely bring it up when I take my car in for servicing.
A point to note is that the wind noise I mentioned is at speeds above 70mph. Below 60mph it isn’t bad at all.

And no. No buyers remorse or anything of the sort. I really like the 330i.
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      11-26-2019, 08:03 AM   #35
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I have a very very subtle wind noise from around driver mirror but so far it's so minimal hasn't bothered me.
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      11-26-2019, 03:51 PM   #36
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Quote:
Originally Posted by Rschin2 View Post
That's an understatement. Wind noise, road noise, all sorts of noise in the cabin. It really wasn't enjoyable for my commute. The G20 is so much quieter.
Well I've at least gotten rid of the rattles for the most part. Just driver side windows noise now but I'm used to it. Above 90mph it's not much fun.
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      12-06-2019, 04:57 PM   #37
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Quote:
Originally Posted by VipinLJ View Post
I had an A4 B9 for 3 years until last week. I had both cars together with me for 2 weeks. And I definitely noticed that my 330i has more wind noise than my A4.
I haven’t driven another 330i so I can’t compare. I’ll definitely bring it up when I take my car in for servicing.
A point to note is that the wind noise I mentioned is at speeds above 70mph. Below 60mph it isn’t bad at all.

And no. No buyers remorse or anything of the sort. I really like the 330i.
Well now that's interesting.

I had a 2015 340i Msport and it had it's sounds, nicely put. Wind noise wasn't bad in mine, but tire and road noise was quite high for a "premium" US automobile.

I now have a 2018 Audi S4 and the tire and road noise is only slightly less than the 340i. It's pretty much the same level of overall road and tires noise as my 340i.
The wind sounds/noise is about the same as the 340i.

In my case my 340i Msport was the older F30 chassis, and my 2108 S4 is a freshened up chassis that was concurrent with the F30.
Your 330i is the new G20 chassis, right?

Does the G20 M340i have different stock/OEM windows compared to the G20 330i?
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      12-06-2019, 05:29 PM   #38
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Quote:
Originally Posted by RPM90 View Post
Well now that's interesting.

I had a 2015 340i Msport and it had it's sounds, nicely put. Wind noise wasn't bad in mine, but tire and road noise was quite high for a "premium" US automobile.

I now have a 2018 Audi S4 and the tire and road noise is only slightly less than the 340i. It's pretty much the same level of overall road and tires noise as my 340i.
The wind sounds/noise is about the same as the 340i.

In my case my 340i Msport was the older F30 chassis, and my 2108 S4 is a freshened up chassis that was concurrent with the F30.
Your 330i is the new G20 chassis, right?

Does the G20 M340i have different stock/OEM windows compared to the G20 330i?
I had two B9 S5's and a B9 S4 and the M340i is quieter than both. Not much more than the S4 but it is. Much more quiet than the S5 (mainly due to the frameless windows though).
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      12-06-2019, 08:43 PM   #39
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Quote:
Originally Posted by RPM90 View Post
Well now that's interesting.

I had a 2015 340i Msport and it had it's sounds, nicely put. Wind noise wasn't bad in mine, but tire and road noise was quite high for a "premium" US automobile.

I now have a 2018 Audi S4 and the tire and road noise is only slightly less than the 340i. It's pretty much the same level of overall road and tires noise as my 340i.
The wind sounds/noise is about the same as the 340i.

In my case my 340i Msport was the older F30 chassis, and my 2108 S4 is a freshened up chassis that was concurrent with the F30.
Your 330i is the new G20 chassis, right?

Does the G20 M340i have different stock/OEM windows compared to the G20 330i?
Yes. I have the G20. I was on a 13hr road trip yesterday in the A7 and it was silent at very high speeds. Got into my 330i and the wind and road noise was shocking. I know itís an apples to oranges comparison but yes. My A4 was almost as silent (wind/road noise) as my A7 at similar speeds. Not so in the 330i. I still havenít found time to take it in to the dealership like someone suggested. Iíll wait till the first service.
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      12-12-2019, 05:40 PM   #40
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Quote:
Originally Posted by VipinLJ View Post
Yes. I have the G20. I was on a 13hr road trip yesterday in the A7 and it was silent at very high speeds. Got into my 330i and the wind and road noise was shocking. I know itís an apples to oranges comparison but yes. My A4 was almost as silent (wind/road noise) as my A7 at similar speeds. Not so in the 330i. I still havenít found time to take it in to the dealership like someone suggested. Iíll wait till the first service.
Given Burrcolds comments, your 330i may be in need of some door and/or gasket adjustments. It has happened to others in other vehicles as well.
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      12-12-2019, 05:44 PM   #41
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Quote:
Originally Posted by Burrcold View Post
I had two B9 S5's and a B9 S4 and the M340i is quieter than both. Not much more than the S4 but it is. Much more quiet than the S5 (mainly due to the frameless windows though).
That's good to know. I was expecting, hoping, that the G20 would be quieter.

I'm not one to want absolute silence in a sport sedan. But, wind noise is not part of the sounds I associate with "performance".

Tire noise is largely dependent on the choice of tires.
The stock summer perf. tires on my S4 were noticeably quieter than the current Mich AS+3 tires on it now.

I'm really enjoying the Quattro AWD with my S4. I loved it in my 2006 A4. I hope BMW's X drive has improved to be additive to the performance as Quattro is to Audi. If it is, I may decide to go with my first AWD BMW for my next car.
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      12-12-2019, 06:53 PM   #42
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Quote:
Originally Posted by RPM90 View Post
Given Burrcolds comments, your 330i may be in need of some door and/or gasket adjustments. It has happened to others in other vehicles as well.
Yes. Iíll be asking them auto check it out when I take it in for service since the dealership is more than an hour away and whenever Iím free, they donít seem to have an opening.
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      12-18-2019, 12:09 AM   #43
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Update: I thought I was having wind noise until I heard it at a stop!! It's the vent system somehow whistling at my drivers window. Turn up the vent, wind noise gets louder, turn it off, goes away. Speed affects it a little I presume due to air flow into vent system.

Can anyone else replicate this?
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      12-19-2019, 04:43 AM   #44
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Quote:
Originally Posted by Transfer View Post
Update: I thought I was having wind noise until I heard it at a stop!! It's the vent system somehow whistling at my drivers window. Turn up the vent, wind noise gets louder, turn it off, goes away. Speed affects it a little I presume due to air flow into vent system.

Can anyone else replicate this?
I'm experiencing the same issue with my M340, not really sure what started it. Sounds like a whistle from the drivers door.
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