BMW M3 Forum (E90 E92)

BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read


Go Back   M3Post - BMW M3 Forum > M3 (E90 / E92 / E93) > Regional Forums > UK
 
Lux Angel Eyes
Post Reply
 
Thread Tools Search this Thread
      05-11-2013, 06:26 PM   #1
sylonien
Major
United Kingdom
17
Rep
1,246
Posts

 
Drives: M3
Join Date: Apr 2012
Location: Somewhere over the rainbow

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... )

__________________
Appreciate 0
      05-12-2013, 06:47 AM   #2
New_m3
Second Lieutenant
5
Rep
241
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
      05-12-2013, 08:09 AM   #3
sylonien
Major
United Kingdom
17
Rep
1,246
Posts

 
Drives: M3
Join Date: Apr 2012
Location: Somewhere over the rainbow

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?
__________________
Appreciate 0
      05-12-2013, 08:36 AM   #4
///M Power-Belgium
Brigadier General
///M Power-Belgium's Avatar
Belgium
66
Rep
3,926
Posts

 
Drives: ///M3-DCT- E92 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
      05-12-2013, 09:16 AM   #5
sylonien
Major
United Kingdom
17
Rep
1,246
Posts

 
Drives: M3
Join Date: Apr 2012
Location: Somewhere over the rainbow

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.
__________________
Appreciate 0
      05-12-2013, 09:37 AM   #6
///M Power-Belgium
Brigadier General
///M Power-Belgium's Avatar
Belgium
66
Rep
3,926
Posts

 
Drives: ///M3-DCT- E92 Silverstone II
Join Date: Jul 2012
Location: Belgium

iTrader: (0)

Quote:
Originally Posted by sylonien View Post
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 ?
Appreciate 0
      05-12-2013, 09:49 AM   #7
PhillyNate
ENTHUSIAST
PhillyNate's Avatar
United_States
25
Rep
2,038
Posts

 
Drives: 2014 Toyota GT-86
Join Date: Apr 2011
Location: Philadelphia

iTrader: (0)

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

"what I'm driving here...is an ending." Jeremy Clarkson
2014 Whiteout Toyota GT-86 6mt(Presently enjoying WAY more than anticipated)
2011 Alpine White BMW M3 6mt ZCP Coupe(forced retirement 06/06/14)
2008 Alpine White BMW 328i 6mt Coupe(retired 06/21/11
)
Appreciate 0
      05-12-2013, 10:08 AM   #8
p-streets
M3NTAL
United_States
3
Rep
298
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
Appreciate 0
      05-12-2013, 02:06 PM   #9
sylonien
Major
United Kingdom
17
Rep
1,246
Posts

 
Drives: M3
Join Date: Apr 2012
Location: Somewhere over the rainbow

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.
__________________
Appreciate 0
      05-28-2013, 04:40 PM   #10
DivideBYZero
Second Lieutenant
United Kingdom
4
Rep
294
Posts

 
Drives: E92 M3, Prev. E46 M3
Join Date: Jul 2011
Location: UK

iTrader: (0)

Garage List
Yep, with exhaust mod I have pops and bangs. I love it!
__________________
2010 E92 M3, DCT, w/Exhaust mod
2002 E36/7 Z3 2.2 Sport
2011 E82 120d Coupe
Appreciate 0
      05-28-2013, 06:08 PM   #11
sylonien
Major
United Kingdom
17
Rep
1,246
Posts

 
Drives: M3
Join Date: Apr 2012
Location: Somewhere over the rainbow

iTrader: (0)

Haha that's awesome.
Mine still pops and bangs with my new exhaust.
__________________
Appreciate 0
      05-28-2013, 07:21 PM   #12
System Of A...
Captain
System Of A...'s Avatar
Armenia
22
Rep
865
Posts

 
Drives: e93 M3
Join Date: Jun 2010
Location: 818

iTrader: (1)

Garage List
2008 BMW e93 M3  [3.83]
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
__________________
Gintani 4.6l S65 | Gintani Race Catless Exhaust | Gintani CF Race lip
Appreciate 0
      05-29-2013, 07:42 AM   #13
sylonien
Major
United Kingdom
17
Rep
1,246
Posts

 
Drives: M3
Join Date: Apr 2012
Location: Somewhere over the rainbow

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.
__________________
Appreciate 0
      06-01-2013, 07:39 PM   #14
sylonien
Major
United Kingdom
17
Rep
1,246
Posts

 
Drives: M3
Join Date: Apr 2012
Location: Somewhere over the rainbow

iTrader: (0)

How about this for a backfire sound?

__________________
Appreciate 0
      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.
Appreciate 0
      06-06-2013, 02:45 PM   #16
PhillyNate
ENTHUSIAST
PhillyNate's Avatar
United_States
25
Rep
2,038
Posts

 
Drives: 2014 Toyota GT-86
Join Date: Apr 2011
Location: Philadelphia

iTrader: (0)

Garage List
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
2014 Whiteout Toyota GT-86 6mt(Presently enjoying WAY more than anticipated)
2011 Alpine White BMW M3 6mt ZCP Coupe(forced retirement 06/06/14)
2008 Alpine White BMW 328i 6mt Coupe(retired 06/21/11
)
Appreciate 0
      06-06-2013, 07:51 PM   #17
sylonien
Major
United Kingdom
17
Rep
1,246
Posts

 
Drives: M3
Join Date: Apr 2012
Location: Somewhere over the rainbow

iTrader: (0)

Quote:
Originally Posted by Peadar View Post
Standard car should not pop nor bang.
You reckon there's something wrong with my car then?
__________________
Appreciate 0
      06-29-2013, 06:23 PM   #18
sylonien
Major
United Kingdom
17
Rep
1,246
Posts

 
Drives: M3
Join Date: Apr 2012
Location: Somewhere over the rainbow

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.

__________________
Appreciate 0
      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
      07-15-2013, 07:25 AM   #20
sylonien
Major
United Kingdom
17
Rep
1,246
Posts

 
Drives: M3
Join Date: Apr 2012
Location: Somewhere over the rainbow

iTrader: (0)

Yeah probably best to do it in stages just in case its too loud
__________________
Appreciate 0
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -5. The time now is 10:25 AM.




m3post
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST