exhaust noise (chuffing)

quality_sound · 06-15-2010, 02:11 PM

Do all E9x M3s sound like they have an exhaust leak? Not like a 70 Mustang with a rusted exhaust, but more of a chuffing sound like the pipes aren't completely sealed? It's really noticeable when driving past raised barriers or in a tunnel.

Thanks all.

Paul

kitw · 06-15-2010, 02:15 PM

Mine only does that when it's warming up.

1sikbmr · 06-15-2010, 02:16 PM

Quote:

Originally Posted by kitw

Mine only does that when it's warming up.

+1

randy McMann · 06-15-2010, 03:54 PM

Are you running stock exhausts? If so, they do tend to have a bit of a "chuffing" or "whispy" / "airy" sound, due to their mechanical sound absorption manuf'g characteristics. A 'free flow' sound absorption system, such as on most of the performance exhausts offered, will tend to run a more realistic sound, w/out that "chuffing". I like the REMUS' I've run on all my Bimmers. Not too loud, but deep, and only loud when I throttle it hard. On the newest M3's (I only wish I could afford :-) they have two versions I believe. A Sport version and a Race version. If you are running an aftermarket system, some use that O.E.M. style baffled / chambered style of sound absorption, and may "chuff" a bit as well.

quality_sound · 06-16-2010, 06:09 AM

Ahhhh, yes I'm running the OEM exhaust. Thanks for the info.

randy McMann · 06-16-2010, 10:26 AM

No problem. I've been doing some research on performance exhausts lately, just thought I'd share a little of what I've learned... I was all set to get my used E 92 M3 from a dealer near here, got all psyched about it, and something came up with my other car, my E 36 M3, (a little spendy...) now I'm not able to pull it off... For a while at least. Had my REMUS "U.S. Sound / Race" exhaust on hold and everything... Ouch. Called 'em up, they were cool about it.

JCtx · 06-16-2010, 11:09 AM

They all do that. It's because of the thin headers. Or simply headers. Most other cars have a big a$$ exhaust manifold that's way quieter than headers. If it was a leak it'd make a loud racket. This particular noise is pretty obvious when just starting the engine, and when putting a load on the engine and driving by a wall, barrier, etc. Sounds cool, actually

.

quality_sound · 06-16-2010, 11:43 AM

Yeah, it definitely dies down a lot when the SAI closes it was just something I'm not used to hearing after the cats warm up.

As long as it's normal it's all good.

Maypo · 07-13-2011, 04:02 PM

Quote:

Originally Posted by quality_sound

Yeah, it definitely dies down a lot when the SAI closes it was just something I'm not used to hearing after the cats warm up.

SAI?

goldminer · 07-13-2011, 04:15 PM

Quote:

Originally Posted by Maypo

SAI?

I think it means secondary air injection. I believe it helps the cats light off earlier.

Maypo · 07-13-2011, 04:48 PM

Ah -- thanks.

GreasyGinzo · 07-13-2011, 04:57 PM

Whoever it sounds cool is crazy...it makes the car sound like complete shit it sounds exactly like an exhaust leak.

serranot · 07-13-2011, 06:54 PM

Quote:

Originally Posted by GreasyGinzo

Whoever it sounds cool is crazy...it makes the car sound like complete shit it sounds exactly like an exhaust leak.

It rocks. It lopes like a cammy dragster. I love it.

GreasyGinzo · 07-13-2011, 07:43 PM

Quote:

Originally Posted by serranot

It rocks. It lopes like a cammy dragster. I love it.

you are confused

FVM3 · 07-13-2011, 07:53 PM

only does when cold start

saeedg48 · 07-16-2011, 08:48 PM

Quote:

Originally Posted by randy McMann

Are you running stock exhausts? If so, they do tend to have a bit of a "chuffing" or "whispy" / "airy" sound, due to their mechanical sound absorption manuf'g characteristics. A 'free flow' sound absorption system, such as on most of the performance exhausts offered, will tend to run a more realistic sound, w/out that "chuffing". I like the REMUS' I've run on all my Bimmers. Not too loud, but deep, and only loud when I throttle it hard. On the newest M3's (I only wish I could afford :-) they have two versions I believe. A Sport version and a Race version. If you are running an aftermarket system, some use that O.E.M. style baffled / chambered style of sound absorption, and may "chuff" a bit as well.

this!

serranot · 07-17-2011, 07:08 AM

Quote:

Originally Posted by GreasyGinzo

you are confused

Lol! Perhaps.

elm3 · 07-17-2011, 08:01 AM

That is normal, the sound is coming from the headers.

FVM3 · 07-17-2011, 08:20 AM

Quote:

Originally Posted by elm3

That is normal, the sound is coming from the headers.

From headers? Why it makes the sound like leaking exhaust

06-15-2010, 02:11 PM	#1
quality_sound 8 tracks of madness 62 Rep 2,735 Posts Drives: Slowly Join Date: Jun 2009 Location: At home iTrader: (1)	exhaust noise (chuffing) Do all E9x M3s sound like they have an exhaust leak? Not like a 70 Mustang with a rusted exhaust, but more of a chuffing sound like the pipes aren't completely sealed? It's really noticeable when driving past raised barriers or in a tunnel. Thanks all. Paul
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06-15-2010, 02:15 PM	#2
kitw Colonel 471 Rep 2,991 Posts Drives: F91 M8, 991.2 GT3 Join Date: Jun 2007 Location: Bay Area, CA iTrader: (20)	Mine only does that when it's warming up.
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06-15-2010, 03:54 PM	#4
randy McMann Enlisted Member 0 Rep 36 Posts Drives: E36 M3 Join Date: Dec 2008 Location: L.A. CA. iTrader: (0)	Are you running stock exhausts? If so, they do tend to have a bit of a "chuffing" or "whispy" / "airy" sound, due to their mechanical sound absorption manuf'g characteristics. A 'free flow' sound absorption system, such as on most of the performance exhausts offered, will tend to run a more realistic sound, w/out that "chuffing". I like the REMUS' I've run on all my Bimmers. Not too loud, but deep, and only loud when I throttle it hard. On the newest M3's (I only wish I could afford :-) they have two versions I believe. A Sport version and a Race version. If you are running an aftermarket system, some use that O.E.M. style baffled / chambered style of sound absorption, and may "chuff" a bit as well.
	Appreciate 0 Quote

06-16-2010, 06:09 AM	#5
quality_sound 8 tracks of madness 62 Rep 2,735 Posts Drives: Slowly Join Date: Jun 2009 Location: At home iTrader: (1)	Ahhhh, yes I'm running the OEM exhaust. Thanks for the info.
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06-16-2010, 10:26 AM	#6
randy McMann Enlisted Member 0 Rep 36 Posts Drives: E36 M3 Join Date: Dec 2008 Location: L.A. CA. iTrader: (0)	No problem. I've been doing some research on performance exhausts lately, just thought I'd share a little of what I've learned... I was all set to get my used E 92 M3 from a dealer near here, got all psyched about it, and something came up with my other car, my E 36 M3, (a little spendy...) now I'm not able to pull it off... For a while at least. Had my REMUS "U.S. Sound / Race" exhaust on hold and everything... Ouch. Called 'em up, they were cool about it.
	Appreciate 0 Quote

06-16-2010, 11:09 AM	#7
JCtx Major General 258 Rep 5,012 Posts Drives: No BMW yet Join Date: May 2008 Location: El Paso TX iTrader: (0)	They all do that. It's because of the thin headers. Or simply headers. Most other cars have a big a$$ exhaust manifold that's way quieter than headers. If it was a leak it'd make a loud racket. This particular noise is pretty obvious when just starting the engine, and when putting a load on the engine and driving by a wall, barrier, etc. Sounds cool, actually .
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06-16-2010, 11:43 AM	#8
quality_sound 8 tracks of madness 62 Rep 2,735 Posts Drives: Slowly Join Date: Jun 2009 Location: At home iTrader: (1)	Yeah, it definitely dies down a lot when the SAI closes it was just something I'm not used to hearing after the cats warm up. As long as it's normal it's all good.
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07-13-2011, 04:48 PM	#11
Maypo Private First Class 10 Rep 191 Posts Drives: IBM E92 Join Date: Mar 2011 Location: Puyallup, WA iTrader: (4)	Ah -- thanks.
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07-13-2011, 04:57 PM	#12
GreasyGinzo Captain 41 Rep 635 Posts Drives: '08 E92 AW 6MT M3(Totaled) Join Date: Dec 2010 Location: North Jersey iTrader: (1)	Whoever it sounds cool is crazy...it makes the car sound like complete shit it sounds exactly like an exhaust leak. __________________
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07-13-2011, 07:53 PM	#15
FVM3 Major General 270 Rep 5,751 Posts Drives: e92 m3, f30 328i Join Date: Sep 2010 Location: Los Angeles iTrader: (2)	only does when cold start
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07-17-2011, 08:01 AM	#18
elm3 ///M Fan 366 Rep 2,159 Posts Drives: '09 E92 M3 IB/'17 f85 X5M LBB Join Date: Sep 2008 Location: Canton, GA. iTrader: (1) Garage List 2017 BMW / X5M [9.00] 2009 E92 M3 [10.00] 2004 Yamaha R1 [10.00]	That is normal, the sound is coming from the headers. __________________ '09 E92 ///M3 Interlagos Blue,6MT,Silver Novillo Leather,CF Trim,Premium Package,Technology Package,Cold Weather Package,Premium Sound,19"Wheels,Moonroof-Toy/'17 X5M, Long Beach Blue, Executive Package,Technology Package, Lighting Package, Driver Assist, Full Mughello Red Interior, 21" wheels-Toy/'14 535i with M Sport and 19" wheels-Daily
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