Backfire / Pop

sylonien · 05-11-2013, 06:26 PM

Guys,

does your car backfire (not flames), but makes pops and burble sound
when you rev and lift off from accelerations etc?
Mine does it all the time! Fun as hell, but that can only mean its got
too much unburnt fuel in the exhaust?!

Worry - bad for the engine, something wrong?
And why my oil consumption is so high (another thread?).

First I thought it was my modded x-pipe/backbox but still does it with my box.

My mates '09 DCT doesn't do it at all. Not sure if its a manual gearbox thing
or just my car running insanely rich or something?

Example, like that at the beginning. Its a really loud pop!
Still does it with my exhaust, much deeper sound but hell does it 'bang'.

(Sounds wrong...

)

New_m3 · 05-12-2013, 06:47 AM

My manual car doesn't do that with the standard exhaust. It might be the sign of something is wrong with yours but it does sound good!

sylonien · 05-12-2013, 08:09 AM

I wonder too, but like said, only does it after my new xpipe / backbox.

Maybe cause the second cat / resonator delete & new back box is letting
more sound / fuel burn in the exhaust when it did happen before but couldn't hear it?

///M Power-Belgium · 05-12-2013, 08:36 AM

I have the same Oem exhaust mod.(replaced the 2 big perforated pipes)
I have not this pop sound !
I think your problem is caused by your secondary cats. removal ,your car sound's also match more raspy than mine.
So...when it's possible,mount your secondary cats. back on(with clamps) ,and give it a try.
BTW...when i step on it during cold start cycle sometimes i hear also a bit backfire .
Conclusion....i think nothing is wrong here,and when you want to be sure,mount your secondary cats. back on,and when it still pops (backfires) than there is another problem...running to rich,and that you must see on your fuel consumption.

sylonien · 05-12-2013, 09:16 AM

My x-pipe has been chopped and welded with straight pipes
so I can't do a swap.

No negligible difference in fuel consumptino.
Still around 17-23mpg like before.

16 l/100km to 12 l/100km.

I guess people's still get occasional pops with oem and mine is more extreme with the secondary cat removed.

///M Power-Belgium · 05-12-2013, 09:37 AM

Quote:

Originally Posted by sylonien

My x-pipe has been chopped and welded with straight pipes
so I can't do a swap.

No negligible difference in fuel consumptino.
Still around 17-23mpg like before.

16 l/100km to 12 l/100km.

I guess people's still get occasional pops with oem and mine is more extreme with the secondary cat removed.

How you will do this with the car inspection ( X-pipe welded on with straight pipes)and the emissions test ?(will fail)
Here in Belgium they look under the car and with cats. removal i will fail ?

PhillyNate · 05-12-2013, 09:49 AM

Mine never did stock. With Eisenmann Race it does now and it sounds great.

p-streets · 05-12-2013, 10:08 AM

mine also dose it with remus race and no cats on xpipe

sylonien · 05-12-2013, 02:06 PM

Woohoo - not just me then!

I love it when it pops, bit more character.

My primary cats are still there, so shouldn't be an issue with emission (MOT/TüV) / engine lights.

DivideBYZero · 05-28-2013, 04:40 PM

Yep, with exhaust mod I have pops and bangs. I love it!

sylonien · 05-28-2013, 06:08 PM

Haha that's awesome.
Mine still pops and bangs with my new exhaust.

Xx__xs · 05-28-2013, 07:21 PM

my catless gintani race exhaust does this allll the time, whether its shifting up, or in the midst of high revs due to downshift. all kinds of pops and gurgles and backfires and my friends noted to me a confirmed flame once, due to downshifting to 1st going maybe 35. i didnt see it, but it sounded like a grenade went off. love it

sylonien · 05-29-2013, 07:42 AM

LOL. Grenade. Yeah does sound like that sometimes. When I lift off at 4000rpm second gear. Its quite a loud boom. Use to be a sharp pop but now it sounds muffled but still burble and pops a lot. Just never heard anyone else that experienced it over here.

sylonien · 06-01-2013, 07:39 PM

How about this for a backfire sound?

Peadar · 06-06-2013, 02:19 PM

Standard car should not pop nor bang.

PhillyNate · 06-06-2013, 02:45 PM

Been around cars my whole 40+ years, I know the difference between good noises and bad noises. Mine are VERY good noises! My car sounds right, REALLY right.

sylonien · 06-06-2013, 07:51 PM

Quote:

Originally Posted by Peadar

Standard car should not pop nor bang.

You reckon there's something wrong with my car then?

sylonien · 06-29-2013, 06:23 PM

New video onboard. Take a listen

Hope you like

Zoom H1 mounted between the exhaust.
You really need some good 2.1 speakers (to replicate the bass/drone) / good good headphones to get the most out of the recorded sound.

jimmy_dean · 07-15-2013, 02:36 AM

Hopefully should get our M3 this week and the first thing it's having done is the exhaust mod. I think I'll leave the cats but remove the silencers and do the back box see how that sounds

sylonien · 07-15-2013, 07:25 AM

Yeah probably best to do it in stages just in case its too loud

anom3 · 05-29-2015, 07:34 AM

Sorry to revive an old thread, but:

I recently installed the akrapovic evo xpipe (primary cats removed, secondary and resonators still there).

I had the install done about 2 weeks ago.

I had my first "backfire" today. Sounded real fun!

Worth noting, I filled up with Shells V-Power+ for the first time in a year (before I had the akra xpipe installed) yesterday. Maybe this has something to do with it? Who knows.

Sounded great though

E92cannon · 06-01-2015, 03:12 AM

Guess mines 'pops'

05-11-2013, 06:26 PM	#1
sylonien Major 114 Rep 1,326 Posts Drives: M3 Join Date: Apr 2012 Location: UK iTrader: (0)	Backfire / Pop - Does yours? [E92 M3 '07] Guys, does your car backfire (not flames), but makes pops and burble sound when you rev and lift off from accelerations etc? Mine does it all the time! Fun as hell, but that can only mean its got too much unburnt fuel in the exhaust?! Worry - bad for the engine, something wrong? And why my oil consumption is so high (another thread?). First I thought it was my modded x-pipe/backbox but still does it with my box. My mates '09 DCT doesn't do it at all. Not sure if its a manual gearbox thing or just my car running insanely rich or something? Example, like that at the beginning. Its a really loud pop! Still does it with my exhaust, much deeper sound but hell does it 'bang'. (Sounds wrong... ) __________________ Please consider checking out my YouTube Channel for car and tech videos.
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05-12-2013, 06:47 AM	#2
New_m3 Second Lieutenant 20 Rep 246 Posts Drives: E92 M3 Join Date: Jun 2008 Location: UK iTrader: (0)	My manual car doesn't do that with the standard exhaust. It might be the sign of something is wrong with yours but it does sound good!
	Appreciate 0 Quote

05-12-2013, 08:09 AM	#3
sylonien Major 114 Rep 1,326 Posts Drives: M3 Join Date: Apr 2012 Location: UK iTrader: (0)	I wonder too, but like said, only does it after my new xpipe / backbox. Maybe cause the second cat / resonator delete & new back box is letting more sound / fuel burn in the exhaust when it did happen before but couldn't hear it? __________________ Please consider checking out my YouTube Channel for car and tech videos.
	Appreciate 0 Quote

05-12-2013, 08:36 AM	#4
///M Power-Belgium General 63316 Rep 24,656 Posts Drives: ///M3-E92-DCT Silverstone II Join Date: Jul 2012 Location: Belgium iTrader: (0)	I have the same Oem exhaust mod.(replaced the 2 big perforated pipes) I have not this pop sound ! I think your problem is caused by your secondary cats. removal ,your car sound's also match more raspy than mine. So...when it's possible,mount your secondary cats. back on(with clamps) ,and give it a try. BTW...when i step on it during cold start cycle sometimes i hear also a bit backfire . Conclusion....i think nothing is wrong here,and when you want to be sure,mount your secondary cats. back on,and when it still pops (backfires) than there is another problem...running to rich,and that you must see on your fuel consumption.
	Appreciate 0 Quote

05-12-2013, 09:16 AM	#5
sylonien Major 114 Rep 1,326 Posts Drives: M3 Join Date: Apr 2012 Location: UK iTrader: (0)	My x-pipe has been chopped and welded with straight pipes so I can't do a swap. No negligible difference in fuel consumptino. Still around 17-23mpg like before. 16 l/100km to 12 l/100km. I guess people's still get occasional pops with oem and mine is more extreme with the secondary cat removed. __________________ Please consider checking out my YouTube Channel for car and tech videos.
	Appreciate 0 Quote

05-12-2013, 09:49 AM	#7
PhillyNate ENTHUSIAST 135 Rep 2,097 Posts Drives: 2010 Porsche Cayman Join Date: Apr 2011 Location: Philadelphia iTrader: (0) Garage List 2010 Porsche Cayman [0.00]	Mine never did stock. With Eisenmann Race it does now and it sounds great. __________________ "what I'm driving here...is an ending." Jeremy Clarkson 2010 Carrara White Porsche Cayman 6mt 2014 Whiteout Toyota GT-86 6mt(Sold 05/23/15) 2011 Alpine White BMW M3 6mt ZCP Coupe(forced retirement 06/06/14) 2008 Alpine White BMW 328i 6mt Coupe(retired 06/21/11)
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05-12-2013, 10:08 AM	#8
p-streets M3NTAL 19 Rep 300 Posts Drives: 09 E92 M3 Join Date: Jun 2009 Location: LAND OF THE LOST TEXAS iTrader: (1)	mine also dose it with remus race and no cats on xpipe
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05-12-2013, 02:06 PM	#9
sylonien Major 114 Rep 1,326 Posts Drives: M3 Join Date: Apr 2012 Location: UK iTrader: (0)	Woohoo - not just me then! I love it when it pops, bit more character. My primary cats are still there, so shouldn't be an issue with emission (MOT/TüV) / engine lights. __________________ Please consider checking out my YouTube Channel for car and tech videos.
	Appreciate 0 Quote

05-28-2013, 04:40 PM	#10
DivideBYZero Never underestimate the Home-Bowl 484 Rep 821 Posts Drives: F87 M2<E92 M3<E46 M3 Join Date: Jul 2011 Location: UK iTrader: (0) Garage List 2017 BMW M2 [0.00] 2016 BMW M235i [0.00] 2012 BMW 120d M Spo ... [0.00] 2010 BMW M3 - SOLD [10.00] 2002 BMW Z3 2.2i Sport [0.00] 2001 BMW M3 - SOLD [9.00]	Yep, with exhaust mod I have pops and bangs. I love it! __________________ 2017 F87 M2, MG, M-DCT 2002 E36/7 Z3 2.2 Sport 5MT 2016 F22 M235i Coupe, MW, ZF8
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05-28-2013, 06:08 PM	#11
sylonien Major 114 Rep 1,326 Posts Drives: M3 Join Date: Apr 2012 Location: UK iTrader: (0)	Haha that's awesome. Mine still pops and bangs with my new exhaust. __________________ Please consider checking out my YouTube Channel for car and tech videos.
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05-28-2013, 07:21 PM	#12
Xx__xs Major 201 Rep 1,255 Posts Drives: m6 Join Date: Jun 2010 Location: los angeles iTrader: (1)	my catless gintani race exhaust does this allll the time, whether its shifting up, or in the midst of high revs due to downshift. all kinds of pops and gurgles and backfires and my friends noted to me a confirmed flame once, due to downshifting to 1st going maybe 35. i didnt see it, but it sounded like a grenade went off. love it
	Appreciate 0 Quote

05-29-2013, 07:42 AM	#13
sylonien Major 114 Rep 1,326 Posts Drives: M3 Join Date: Apr 2012 Location: UK iTrader: (0)	LOL. Grenade. Yeah does sound like that sometimes. When I lift off at 4000rpm second gear. Its quite a loud boom. Use to be a sharp pop but now it sounds muffled but still burble and pops a lot. Just never heard anyone else that experienced it over here. __________________ Please consider checking out my YouTube Channel for car and tech videos.
	Appreciate 0 Quote

06-01-2013, 07:39 PM	#14
sylonien Major 114 Rep 1,326 Posts Drives: M3 Join Date: Apr 2012 Location: UK iTrader: (0)	How about this for a backfire sound? __________________ Please consider checking out my YouTube Channel for car and tech videos.
	Appreciate 0 Quote

06-06-2013, 02:19 PM	#15
Peadar New Member 1 Rep 13 Posts Drives: E90 335d M Sport Join Date: Jun 2013 Location: Belfast iTrader: (0)	Standard car should not pop nor bang.
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06-06-2013, 02:45 PM	#16
PhillyNate ENTHUSIAST 135 Rep 2,097 Posts Drives: 2010 Porsche Cayman Join Date: Apr 2011 Location: Philadelphia iTrader: (0) Garage List 2010 Porsche Cayman [0.00]	Been around cars my whole 40+ years, I know the difference between good noises and bad noises. Mine are VERY good noises! My car sounds right, REALLY right. __________________ "what I'm driving here...is an ending." Jeremy Clarkson 2010 Carrara White Porsche Cayman 6mt 2014 Whiteout Toyota GT-86 6mt(Sold 05/23/15) 2011 Alpine White BMW M3 6mt ZCP Coupe(forced retirement 06/06/14) 2008 Alpine White BMW 328i 6mt Coupe(retired 06/21/11)
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06-29-2013, 06:23 PM	#18
sylonien Major 114 Rep 1,326 Posts Drives: M3 Join Date: Apr 2012 Location: UK iTrader: (0)	New video onboard. Take a listen Hope you like Zoom H1 mounted between the exhaust. You really need some good 2.1 speakers (to replicate the bass/drone) / good good headphones to get the most out of the recorded sound. __________________ Please consider checking out my YouTube Channel for car and tech videos.
	Appreciate 0 Quote

07-15-2013, 02:36 AM	#19
jimmy_dean Registered 0 Rep 2 Posts Drives: BMW E92 M3 Join Date: Jul 2013 Location: UK, Suffolk iTrader: (0)	Hopefully should get our M3 this week and the first thing it's having done is the exhaust mod. I think I'll leave the cats but remove the silencers and do the back box see how that sounds
	Appreciate 0 Quote

07-15-2013, 07:25 AM	#20
sylonien Major 114 Rep 1,326 Posts Drives: M3 Join Date: Apr 2012 Location: UK iTrader: (0)	Yeah probably best to do it in stages just in case its too loud __________________ Please consider checking out my YouTube Channel for car and tech videos.
	Appreciate 0 Quote

05-29-2015, 07:34 AM	#21
anom3 Captain 260 Rep 955 Posts Drives: F30 335ix Join Date: Apr 2014 Location: Behind the wheel iTrader: (0)	Sorry to revive an old thread, but: I recently installed the akrapovic evo xpipe (primary cats removed, secondary and resonators still there). I had the install done about 2 weeks ago. I had my first "backfire" today. Sounded real fun! Worth noting, I filled up with Shells V-Power+ for the first time in a year (before I had the akra xpipe installed) yesterday. Maybe this has something to do with it? Who knows. Sounded great though
	Appreciate 0 Quote

06-01-2015, 03:12 AM	#22
E92cannon Private First Class 14 Rep 106 Posts Drives: E92 M3 in Mineral White Join Date: May 2014 Location: Scotland, Uk iTrader: (0)	Guess mines 'pops'
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