05-05-2012, 02:52 PM | #1 |
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Car & Driver: F30 335i interior noise: 3dB louder at 70mph than F30 328i & E90 330i
http://media.caranddriver.com/files/...april-2012.pdf
BMW 335i (F30) Interior Noise Idle 42 dBA Full-throttle 77 dBA 70 mph 69 dBA Car & Driver, April 2005: BMW 330i (E90) Interior Noise Idle 41 dBA Full-throttle 73 dBA 70 mph 66 dBA I couldn't find an instrumented test of the E90 335i sedan in back issues of C&D. Car & Driver: 2007 BMW 335i coupe (E92) Interior Noise Idle 49 dBA Full-throttle 75 dBA 70 mph 69 dBA 4-cylinder: http://media.caranddriver.com/files/...ison-tests.pdf 2012 BMW 328i (F30) (with sunroof) Interior Noise Idle 40 dBA Full-throttle 71 dBA 70 mph 66 dBA http://media.caranddriver.com/files/...2-bmw-528i.pdf 2012 BMW 528i (F10) Interior Noise Idle 38 dBA Full-throttle 70 dBA 70 mph 64 dBA The 2 dBA difference at idle between the current 328i & 335i suggests that differences at speed are due mainly to the louder 6-cylinder engine. The 2 dBA difference at idle between the 328i and 528i must be due to better noise insulation in the 5-series and possibly a noisier exhaust in the 328i. |
05-05-2012, 09:29 PM | #2 |
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Interesting info.
While a 3dB increase in measured SPL represents a doubling of acoustical energy, what the human ear actually perceives as a difference in "loudness" varies a great deal at different frequencies, the ears/brain don't have a flat response curve. Generally though, the average person needs about a 5+dB change to really notice a difference. I imagine there is also a certain amount of influence on perceived changes in "loudness" resulting from tactile vibrations felt through the seats, floor, or steering wheel. Not sure 2-3dB SPL differences will really be perceptible by most people...at the very least those differences aren't very meaningful without factoring in other variables like frequency and tactile vibrations. |
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05-06-2012, 02:16 AM | #3 | |
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05-06-2012, 07:59 AM | #5 | |
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Interior sound is very subjective indeed. I do enjoy some interior noise. It adds character to the car. I can't stand hybrids or really quiet interiors (Lexus). I feel like I'm driving a golf cart. They lack "soul". |
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05-06-2012, 08:29 AM | #6 | |
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05-22-2012, 07:01 PM | #7 | |
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Last edited by Mav555; 05-22-2012 at 07:07 PM.. |
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05-22-2012, 09:26 PM | #8 | |
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3 dBa is considered "barely noticeable", or more correctly imo, it's a "noticeable" difference, meaning, the average person will be able to tell that there is an increase in volume of that noise. So, given those numbers in that test, the F30 has a noticeable, louder noise volume when compared to a car with a 3 dBa SPL lower reading. The E90 tested is a non turbo. The 07 tested is an N54 turbo. It's interesting that the F30 is louder. Could be thinner glass to keep weight down. The tires used can add to this. Less insulation. Compare the F30 335i to the F30 328i, it's likely that the same glass and insulation is being used. Tires may be a part. But, look at the "full throttle" reading. 328i is 71dBa, and the 335i is 77dBa. It's likely the engine that's mainly responsible for most, if not all of it. Interesting catch on this info. Thanks for posting it. |
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05-22-2012, 09:29 PM | #9 | |
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Is the wind noise that annoying? It may not be the volume of it so much as the type of noise it generates. When you listen to music in the car, do you "forget"/not notice the wind noise? I tend to drive with the audio on all the time. And if the weather is nice, the window/s are open. It's quite a bit louder then. |
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05-23-2012, 02:22 PM | #10 | |
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I like to drive with everything turned off sometimes. This is the only time I notice and it gets stuck in my head. Although the F30 has a pretty low drag coefficient, it doesn't seem that the air flows all that smoothly around the seals (or the gutter on the edges of the windshield). I was just surprised at the level of wind buffeting noise, especially at highway speeds @ 70+ (it is not the usual constant wind noise from high speeds). |
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05-23-2012, 09:54 PM | #12 | |
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Modern automobile design and construction has quieted so much of the mechanical sounds we were used to, so that now other sounds seem louder, like little creaks and squeaks which would in older cars probably not be heard over thet engine noise, exhaust, suspension noise, chassis noise and vibration. I'll have to take more note of it in my next test drives. My last test drive in a 335i I had the audio off, AC on. I could hear the air coming from the vents. What I wish there was more of is exhaust sound, engine, and intake at greater throttle opening. But then, this is a "near luxury" car who's design has moved more and more towards luxury sedan than sport sedan. |
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05-24-2012, 02:47 AM | #14 |
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I like to hear my car "roar" when I floor it down.
What I don't like is wind and tyre/road noise which makes you turn the stereo up. Particularly wind noise... |
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05-25-2012, 02:58 AM | #15 | |
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Anyone notice the piece of plastic that juts out straight off the bottom of the side mirror? It's the continuation of the trim around the mirror. That can't be all too aerodynamic or good for wind noise. But there is good isolation from road and mechanical sounds. And yes, I would love a bit more exhaust note (not too particular on the 4 w/ direct injection noise) although it is a "near luxury" car. Are our cars classified as "near sport" cars as well? |
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