Vibrations

C|3R1C · 02-21-2012, 03:52 PM

So I have AA HFC and AA Catback on my E93 M3. Anyone experience weird vibrations coming from either the front of the dash near the windshield, centerconsole, or a weird (sounds like rasping but I guess like a static metal sound) noise coming from the rear end of the exhaust (only happens at around 2800 rpm and low speeds)?

ES_TRADER · 02-22-2012, 01:03 PM

yup/....got vibrations from dash area and buzzing...also buzzing from under center console at low rps...like a bit above 1k...But zero vibrations from the rear end...full akra

C|3R1C · 02-22-2012, 01:23 PM

Still trying to figure out where that noise is coming from... | | this close to ripping the panels off and checking >_>

Zzhou · 02-22-2012, 01:33 PM

Quote:

Originally Posted by C|3R1C

So I have AA HFC and AA Catback on my E93 M3. Anyone experience weird vibrations coming from either the front of the dash near the windshield, centerconsole, or a weird (sounds like rasping but I guess like a static metal sound) noise coming from the rear end of the exhaust (only happens at around 2800 rpm and low speeds)?

I have catless, I think this is totally normal.

C|3R1C · 02-22-2012, 01:43 PM

Yea I think it is too... just wish I could make it go away with like foam or something

aajami · 02-22-2012, 02:12 PM

All the plastic pieces and metal bits in your car have different resonance frequencies. As your exhaust revs up and down and creates frequencies that match the resonance of those pieces, they'll begin to oscillate and make more noise. It's a fruitless effort to get them to stop rattling, unless you make your exhaust and engine quieter.

C|3R1C · 02-22-2012, 02:29 PM

Thanks for the input aajami! I guess I'll just turn up the music more lol

Zzhou · 02-22-2012, 02:53 PM

I think if the resonance frequency of the exhaust matches the parts on the car, it will vibrates. It does not happen because you have a loud exhaust. maybe I'm wrong lol....

huyner328 · 02-22-2012, 03:18 PM

Yeah, I have the vibration too, beyond annoying... and as most people have stated on these forums, there are a lot of potential factors.

02-21-2012, 03:52 PM	#1
C\|3R1C So Kewl Guy 49 Rep 619 Posts Drives: 2010 E93 M3 DCT Join Date: Sep 2011 Location: Los Angeles iTrader: (3)	Vibrations So I have AA HFC and AA Catback on my E93 M3. Anyone experience weird vibrations coming from either the front of the dash near the windshield, centerconsole, or a weird (sounds like rasping but I guess like a static metal sound) noise coming from the rear end of the exhaust (only happens at around 2800 rpm and low speeds)?
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02-22-2012, 01:03 PM	#2
ES_TRADER Colonel 344 Rep 2,928 Posts Drives: 328i, 335i, M3, 535i, X5, 36M Join Date: Oct 2010 Location: OC iTrader: (3) Garage List 2014 Ford Raptor [0.00] 2012 328i E92 [10.00] 2013 X5 [0.00] 2013 335i F30 [8.00] 1990 Toyota Previa [0.00] 1997 E36 M3 [10.00] 2011 E92 M3 [0.00] 2011 535i [0.00]	yup/....got vibrations from dash area and buzzing...also buzzing from under center console at low rps...like a bit above 1k...But zero vibrations from the rear end...full akra
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02-22-2012, 01:23 PM	#3
C\|3R1C So Kewl Guy 49 Rep 619 Posts Drives: 2010 E93 M3 DCT Join Date: Sep 2011 Location: Los Angeles iTrader: (3)	Still trying to figure out where that noise is coming from... \| \| this close to ripping the panels off and checking >_>
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02-22-2012, 01:43 PM	#5
C\|3R1C So Kewl Guy 49 Rep 619 Posts Drives: 2010 E93 M3 DCT Join Date: Sep 2011 Location: Los Angeles iTrader: (3)	Yea I think it is too... just wish I could make it go away with like foam or something
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02-22-2012, 02:12 PM	#6
aajami Brigadier General 432 Rep 4,567 Posts Drives: Space Gray '09 E92 M3 Join Date: Dec 2008 Location: Manhattan Beach, CA iTrader: (4)	All the plastic pieces and metal bits in your car have different resonance frequencies. As your exhaust revs up and down and creates frequencies that match the resonance of those pieces, they'll begin to oscillate and make more noise. It's a fruitless effort to get them to stop rattling, unless you make your exhaust and engine quieter. __________________ '09 E92 M3: Space Gray, Black, Carbon Leather \| ZTP 2MK ZPP 2MT 6FL \| link 1 / link 2 Mods: M Performance exhaust \| ZCP retrofit \| Euro airbox \| GTS DCT flash \| JPN 240 ECU flash \| Euro LCI taillights \| CRT lip \| OEM alarm retrofit \| Space Gray bumper plugs \| BMW Performance: Mk. II spoiler / Mk. II non-electronic steering wheel / mirror caps / front grilles / side gills / intake louvers / emblem
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02-22-2012, 02:29 PM	#7
C\|3R1C So Kewl Guy 49 Rep 619 Posts Drives: 2010 E93 M3 DCT Join Date: Sep 2011 Location: Los Angeles iTrader: (3)	Thanks for the input aajami! I guess I'll just turn up the music more lol
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02-22-2012, 02:53 PM	#8
Zzhou Captain 57 Rep 600 Posts Drives: 2012 E92 SSII ZCP DCT Join Date: Aug 2011 Location: West Lafayette,IN/Shanghai,China iTrader: (0)	I think if the resonance frequency of the exhaust matches the parts on the car, it will vibrates. It does not happen because you have a loud exhaust. maybe I'm wrong lol....
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02-22-2012, 03:18 PM	#9
huyner328 Former N54 Fanatic 84 Rep 1,927 Posts Drives: Slow Join Date: Nov 2009 Location: NoVA iTrader: (8) Garage List 2014 Range Rover Sp ... [10.00] 2012 Fiat Abarth [10.00]	Yeah, I have the vibration too, beyond annoying... and as most people have stated on these forums, there are a lot of potential factors. __________________ FREE MIXES! https://soundcloud.com/djbradpiff
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