135 fart sound from exhaust question??

Papa13 · 05-04-2009, 09:23 PM

I just hit 1k miles on my 135 and started getting on it. When ever I give it 3/4 pedal or more and take it past 6k rpm there is a weird fart sound coming from the exhaust when I shift. It's mainly in 1st to 2nd shifts. Anyone else experience this? It sounds to me like some back pressure, which I know is not good for turbo cars. But, I don't remember my buddies 335 sounding like this when he first got it. Any help would be greatly appreciated.

I just want to make sure that it's something normal. The car seems to be pulling hard, so it leads me to believe that its nothing bad.

Thanks guys

993 911 · 05-05-2009, 12:57 AM

Its normal, my 335 makes the burbling noise as well.

penny · 05-05-2009, 03:58 AM

My performance exhaust has the fart sound as well... a manly low fart.

BrokenVert · 05-05-2009, 05:26 AM

Quote:

Originally Posted by penny

My performance exhaust has the fart sound as well... a manly low fart.

As opposed to squeaky high fart?

Your talking about that burble below 1500 RPM when the car is cold right? Its perfectly normal, it happens to me every morning.

Papa13 · 05-05-2009, 08:53 AM

Quote:

Originally Posted by BrokenVert

As opposed to squeaky high fart?

Your talking about that burble below 1500 RPM when the car is cold right? Its perfectly normal, it happens to me every morning.

Nah, only happens when I shift 1st to 2nd above 6k rpm with close to full throttle. Hope it's normal. Thanks guys

BMW-driver · 05-05-2009, 09:54 AM

Did you eat onions?

SlickShift · 05-05-2009, 10:00 AM

I'm guess it's the wastegate.

penny · 05-05-2009, 10:04 AM

Quote:

Originally Posted by BrokenVert

As opposed to squeaky high fart?

Your talking about that burble below 1500 RPM when the car is cold right? Its perfectly normal, it happens to me every morning.

Is it only me that actually likes the fart sound, preferably from the exhaust? =)

randomquickness · 05-05-2009, 01:52 PM

sure it isn't the diverter valves your hearing?

VOLTman · 05-27-2009, 10:08 PM

Does it remind you of the "Dirty Raoul", or is it more "Brown Mosquito"?

BMW86 · 05-27-2009, 11:09 PM

Quote:

Originally Posted by penny

Is it only me that actually likes the fart sound, preferably from the exhaust? =)

Nah I like it too

135forthewin · 05-27-2009, 11:19 PM

I've heart two different things on this topic:
a) it's the motor cutting spark on upshifts: handled by the ECU
b) it's a small backfire

"A" had been suggested to me by a friend with an audi a3 2.0t with the DSG gearbox. He gets a similar sound on upshifts. For more info on that opinion, google "DSG fart". It's discussed on several forums.

Upgrade+ · 05-28-2009, 01:11 PM

Papa, I thought you just installed dp's? If so, maybe that's why.

imported_mega · 05-28-2009, 01:17 PM

isn't it the diverter valves?

Papa13 · 05-28-2009, 01:31 PM

Quote:

Originally Posted by Upgrade+

Papa, I thought you just installed dp's? If so, maybe that's why.

yea I did just install some downpipes but this sound had been happening from the day I picked up the car. It has become less frequent now but still every once in a while when I punch it it will make that fart sound when I shift

imported_mega · 05-28-2009, 01:32 PM

Quote:

Originally Posted by Papa13

yea I did just install some downpipes but this sound had been happening from the day I picked up the car. It has become less frequent now but still every once in a while when I punch it it will make that fart sound when I shift

when you lift off the throttle the diverter valves release boost pressure

it's very noticeable if it happens when your passing a van or big car

05-04-2009, 09:23 PM	#1
Papa13 Go Gators! 90 Rep 1,621 Posts Drives: e82 / e90 / e53 / e46 Join Date: Nov 2005 Location: Tampa / SoCal iTrader: (5) Garage List 2009 135i [0.00]	135 fart sound from exhaust question?? I just hit 1k miles on my 135 and started getting on it. When ever I give it 3/4 pedal or more and take it past 6k rpm there is a weird fart sound coming from the exhaust when I shift. It's mainly in 1st to 2nd shifts. Anyone else experience this? It sounds to me like some back pressure, which I know is not good for turbo cars. But, I don't remember my buddies 335 sounding like this when he first got it. Any help would be greatly appreciated. I just want to make sure that it's something normal. The car seems to be pulling hard, so it leads me to believe that its nothing bad. Thanks guys __________________ e90 M-Tech 330i JB/Terra / e82 n54 135i AW/CR 420rwhp 444rwtq - RIP e53 X5 4.8is M///BLUE/M///SUEDE - 357whp 369wtq - The Snow Beast! n54 135i JB/CR JB4 FBO - Tc Kline D/A Coils - 11.5 @ 122mph 1/4 mile 18' Blue/Black SEL Premium R-Line 4 Motion Tiguan - Mods on order
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05-05-2009, 12:57 AM	#2
993 911 Captain 47 Rep 882 Posts Drives: Z3M, F31, G07 Join Date: Jan 2007 Location: Portland iTrader: (0)	Its normal, my 335 makes the burbling noise as well.
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05-05-2009, 03:58 AM	#3
penny Captain 43 Rep 829 Posts Drives: '08 135i (sold) Join Date: May 2008 Location: Las Colinas iTrader: (2)	My performance exhaust has the fart sound as well... a manly low fart. __________________ '08 135i.
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05-05-2009, 09:54 AM	#6
BMW-driver Drive carefully :) 6 Rep 322 Posts Drives: 1M Valencia Orange Join Date: Jan 2009 Location: Leeuwarden iTrader: (0)	Did you eat onions?
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05-05-2009, 10:00 AM	#7
SlickShift Lieutenant Colonel 323 Rep 1,804 Posts Drives: '11 BMW E90 M3 ZCP, '21 X5 ZMP Join Date: May 2007 Location: Atlanta iTrader: (7)	I'm guess it's the wastegate. __________________ -Nick 2018 BMW 440i - M Sport, Exec Glacier Silver Metallic/Coral Red Dakota Retired: '00 323i, '06 325Ci, '09 135i, '06 Z4M Roadster, '93 525i, '76 2002, '14 X1, '14 M235i, '16 X4, '16 435i
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05-05-2009, 01:52 PM	#9
randomquickness Brigadier General 219 Rep 3,668 Posts Drives: 996tt Join Date: Sep 2008 Location: Georgetown, TX iTrader: (13)	sure it isn't the diverter valves your hearing? __________________
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05-27-2009, 10:08 PM	#10
VOLTman New Member 1 Rep 29 Posts Drives: 2009 135i Montego Blue Join Date: Apr 2008 Location: Woodbury, MN iTrader: (0)	Does it remind you of the "Dirty Raoul", or is it more "Brown Mosquito"?
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05-27-2009, 11:19 PM	#12
135forthewin Lieutenant 48 Rep 546 Posts Drives: sideways Join Date: Oct 2008 Location: U.S. iTrader: (0)	I've heart two different things on this topic: a) it's the motor cutting spark on upshifts: handled by the ECU b) it's a small backfire "A" had been suggested to me by a friend with an audi a3 2.0t with the DSG gearbox. He gets a similar sound on upshifts. For more info on that opinion, google "DSG fart". It's discussed on several forums. __________________ Legal Disclaimer: Anything I or anyone else says about my vehicle on this website(1addicts.com or any affiliated or nonaffiliated sites), pertaining to modifications, is only to gain acceptance from my/our peers, and does not actually represent anything actually existing on my car, and thus, cannot be held against me in any issues, i.e. warranty claims, that may arise.
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05-28-2009, 01:11 PM	#13
Upgrade+ Good life 130 Rep 1,937 Posts Drives: 2008 E90 M3 AW Join Date: Oct 2007 Location: NY iTrader: (8)	Papa, I thought you just installed dp's? If so, maybe that's why.
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05-28-2009, 01:17 PM	#14
imported_mega Colonel 123 Rep 2,200 Posts Drives: various bmw's Join Date: Jul 2007 Location: neverland iTrader: (0)	isn't it the diverter valves? __________________ You only need two tools in life - WD-40 and Duct Tape. If it doesn't move and should, use the WD-40. If it shouldn't move and does, use the duct tape. Driving e82, e72, e85, R53 Gone but not forgotten.. 1974 2002, many various 3s.
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