09-18-2013, 04:53 PM | #485 | |
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09-18-2013, 05:07 PM | #486 |
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I think more road noise is a fact of life. The cars are more powerful, hence wider tires. Manufacturers need to keep weight down for fuel efficiency so less insulation. Result is more road noise. If you want less road noise you will have to take the panels apart and apply more insulation.
There really is no way around road noise problems. Wind noise on the other hand can be fixed. |
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09-18-2013, 05:12 PM | #487 | |
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Anyway all these findings (whether theoretical or practical) do not help us if the glass quality is an issue. Swapping all windows against the same glass by the dealer would be a no-brainer. |
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09-18-2013, 05:13 PM | #488 | |
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BTW a lot of people on the russian F30 forum decreased the road noise significantly by insulating the wheel arcs properly (though adding weight :-(). Last edited by lightyear36; 09-18-2013 at 05:19 PM.. |
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09-18-2013, 07:17 PM | #489 |
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Haha, we're taping and patching our $50k+ German luxury sedans like they would be Trabant, Lada or Renault 16. This is ridiculous.
Here's the gist of it: there is a problem with the door rubber or door alignment. Besides the road noise, normal wind noise, we also have a clear woosh sound at the top of B-pillar, and I can CLEARLY hear the cars passing me, and even the cars going the other way at a distance of 20 feet or more. It's like the window or the door is not closed properly. That's not thinner glass. It's not mirror design. It's poor rubber, poor design or poor door alignment. Period. Someone here was saying something about testing an A4 or A6. I can tell you by now, the 2009 A4 is quieter, it has less road noise and wind noise. Another thing I can tell you is that the 2011 A4 LCI is EVEN QUIETER. They got their shit together and it's now MUCH quieter car than my F30. Regarding the F10 being "only" 30% quieter than the F30. That's huge. That's the level of my 2007 750Li. Plus, no one's doing 200 kph in US of A.
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09-18-2013, 08:06 PM | #490 | ||||||
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Like I said in one of my earlier posts, the problem is then even more severe for me, because one can drive 200 kmh (or more) for extended periods of time here, which isn't funny anymore and the noise could be health-damaging in the worst case. At 250 kmh in F30 you cannot hear a damn thing except the ubiquitous wind noise. |
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09-18-2013, 08:23 PM | #491 |
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First of all lightyear... Good on you for doing all that work and documenting that here. Thanks a heap for that.
Second, i have been thinking about my statement about road noise vs wind noise a bit more from my last post. I will admit that taping the window edges with sound insulating foam did also reduce the wooshing sound around the cabin noise. but the majority of the din is from tyre roar. In other words, if you tried the same test it may reduce what you perceive to be b pillar wind noise but i am attributing to tyre roar. Thirdly, if anyone is attempting to locate a problem, do not use tape. Use foam other another proper insulating material. Tape isnt noise insulating and therefore will not conclusively rule your theory in or out
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09-18-2013, 08:27 PM | #492 |
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Btw it is a pity that my car is only booked in thurs next week to address the side window seals. I wont have any positive updates till then. Even so, there may be delays in obtaining a replacement part or the service guys giving me the within spec" runaround.
But taping the side window seals was a telling difference.
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09-18-2013, 08:36 PM | #493 | |
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09-18-2013, 08:39 PM | #494 |
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Ckau raises a good point about tire noise. Has anyone attempted to correlate noise vs. tire type? Different tires can have significantly different noise levels. Tire noise is omnidirectional and different to pinpoint.
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09-18-2013, 08:43 PM | #495 | ||
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For me the telling difference was this one: At least the pattern of the wooshing changed, which means I got the right body element. But again - bluemark81 couldn't confirm any improvement. And the test with a dismounted side mirror is still pending. |
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09-18-2013, 08:47 PM | #496 | |
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But the noise would then be stable independent of whether one has head or tail wind. This isn't the case apparently. Anyway winter is coming and I will be putting on some non-RFT Goodyears with 68dB (EU spec). Will check then. |
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09-18-2013, 08:54 PM | #497 | |
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Last place ... guess ... F30. It's worse than my first car, a Citroen Xsara. The tires roar (I already changed the original flats to Kumho Ecsta LX Platinum- quietest Kumho tires), the wind blows, what can I say? Convertible experience
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09-18-2013, 09:00 PM | #498 | |
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09-18-2013, 09:05 PM | #499 |
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If it's eliminateable by taping, I do. See the first paragraph here:
http://www.f30post.com/forums/showpo...&postcount=388 But of course you're welcome to repeat the test for yourself :-). |
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09-18-2013, 09:17 PM | #500 | |
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09-18-2013, 09:32 PM | #501 | |
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I use the term whistling loosely, but it's the best way to describe the sound heard when air is accelerated through a passage. Moving are does not generate any noise without encountering an obstacle that will either accelerate or decelerate it. In the case of infiltration the are is accelerated through the void/passage. |
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09-18-2013, 09:43 PM | #502 | |
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09-18-2013, 09:56 PM | #503 |
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Let me quickly summarize the current pending items:
1) Waiting for update from CKau after his window guides have been replaced. 2) Waiting for update from me once I had my doors checked/adjusted by the dealer. 3) Waiting for update from the German thread - wheel arc suspicion. 4) Waiting for update from the German thread - replacement of complete rubber seals in the doors. 5) Hoping for somebody to dismount the side mirrors and do the test. 6) Waiting for update from the member Anaskh regarding possible new side mirror design (http://www.f30post.com/forums/showpo...&postcount=393). |
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09-18-2013, 10:36 PM | #504 | |
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09-18-2013, 10:58 PM | #505 |
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320d has a noticeably louder engine whose roar is the primary source of noise at high revs/speeds. How fast did you go with your 335i?
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09-19-2013, 06:20 AM | #506 | |
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This is what i thought my problem was as well until I soundproofed the wheel arches. Do you have a variety of freeways with different surfaces ? Here in sydney we have a mix of really good top quality hushed tarmc versus really third world sh1tty coarse concrete. The whooshing noise is markedly different which lead me to realise it was not a wind noise issue. Does your wind noise differ between surfaces? In any event, i would like to see you and lightyear to try taping the door window edges like i did to see if it makes a difference, and perhaps even the b pillar gap between the doors (as a separate exercise so you can pinpoint the delta) Just an update from me.... Ironically it is unfortunate that my wind and road roar was nearly non existent tonight on the same stretch of road where it was noticeable same time last week. I say undortunate because the service centre is more likely to fob me off than assist if the problem was blatantly present. I put it down to the wheel arch insulation i reinstalled and warmer temperatures expanding the window seals.
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