135 fart sound from exhaust question?? - BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)

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! Drives: e82 / e90 / e53 / e46 Join Date: Nov 2005 Location: Tampa / SoCal Posts: 1,290 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 __________________ M-tech e90 - RIP 11.5 sec 1/4 mile @ 122mph N54 135i - RIP e53 X5 4.8is - The beast!
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05-05-2009, 12:57 AM	#2
993 911 Captain Drives: E93 335i, E82 135i Join Date: Jan 2007 Location: Portland Posts: 855 iTrader: (0) Garage List 2008 135i [0.00] 2007 335i Convertible [0.00]	Its normal, my 335 makes the burbling noise as well. __________________ '08 135i - Alpine/Black, BMW Performance

05-05-2009, 03:58 AM	#3
penny Captain Drives: '08 135i (sold) Join Date: May 2008 Location: Las Colinas Posts: 841 iTrader: (2)	My performance exhaust has the fart sound as well... a manly low fart. __________________ '08 135i.

05-05-2009, 10:00 AM	#7
SlickShift Major Drives: '09 135i - 6MT Join Date: May 2007 Location: Tampa, FL Posts: 1,286 iTrader: (1)	I'm guess it's the wastegate. __________________ -Nick TiAg/Coral/Glacier Breyton Race GTS-R - Eibach Springs - E92 Front Sway - BMW CF Strut Brace - JB4 - DCI - Synapse BOV - MagnaFlow Exhaust - Berk Midpipes - LCI Blackline Tails - CSR Eyelids - BMW Performance Sideskirts

05-05-2009, 01:52 PM	#9
randomquickness Brigadier General Drives: 996tt Join Date: Sep 2008 Location: Killeen, TX Posts: 3,503 iTrader: (9)	sure it isn't the diverter valves your hearing? __________________

05-05-2009, 09:54 AM	#6
BMW-driver Drive carefully :) Drives: 1M Valencia Orange Join Date: Jan 2009 Location: Leeuwarden Posts: 322 iTrader: (0)	Did you eat onions?

05-27-2009, 10:08 PM	#10
VOLTman New Member Drives: 2009 135i Montego Blue Join Date: Apr 2008 Location: Woodbury, MN Posts: 29 iTrader: (0)	Does it remind you of the "Dirty Raoul", or is it more "Brown Mosquito"?

05-27-2009, 11:19 PM	#12
135forthewin Lieutenant Drives: sideways Join Date: Oct 2008 Location: U.S. Posts: 544 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.

05-28-2009, 01:11 PM	#13
Upgrade+ Good life Drives: BMW 335i Titanium Silver sport Join Date: Oct 2007 Location: NY Posts: 1,462 iTrader: (8)	Papa, I thought you just installed dp's? If so, maybe that's why.

05-28-2009, 01:17 PM	#14
imported_mega Lieutenant Colonel Drives: various bmw's Join Date: Jul 2007 Location: neverland Posts: 1,983 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. Gone but not forgotten.. 1974 2002, 1987 325ic, 1987 325is 1995 M3, 2001 X5, 2007 MCS R56

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