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F12 / F13 (2012 - Current)
The all new 3rd generation 6 series coupe (F13) and convertible (F12) forum. The F06 BMW 6 Series Gran Coupe forum is here

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  #1  
Old 11-25-2012, 04:52 PM
nwills nwills is offline
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Backfire on deceleration (popping noise)

I've noticed on my 650i Gran Coupe while in sport mode that when I come to a stop I get some "pops" coming from the exhaust...back firing. It's pretty much doing it 75% of the time.
It sometimes only gives me a gurgle with slight popping or an all out relatively loud pop!

Is this normal...anyone else experience this?
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  #2  
Old 11-25-2012, 06:07 PM
greenie99 greenie99 is offline
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Quote:
Originally Posted by nwills View Post
I've noticed on my 650i Gran Coupe while in sport mode that when I come to a stop I get some "pops" coming from the exhaust...back firing. It's pretty much doing it 75% of the time.
It sometimes only gives me a gurgle with slight popping or an all out relatively loud pop!

Is this normal...anyone else experience this?
I would say that these cars run a bit lean. What you are hearing is a bit of unburned fuel in the exhaust system. I happen to like the sound and unless someone knows better, I wouldnt worry about it.
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  #3  
Old 11-25-2012, 07:18 PM
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Itinj6 Itinj6 is online now
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I don't get that... But I wish I did
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  #4  
Old 11-25-2012, 07:33 PM
nwills nwills is offline
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Originally Posted by Itinj6 View Post
I don't get that... But I wish I did
lol...I enjoy it as well but it's almost too much! Every red traffic light I come to, the car gurgles and pops it's a little out of character for a luxury sedan (I have a 650 Gran Coupe).

I'm just a little surprised that it does it so much! I'll try and get a video to upload.
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  #5  
Old 11-25-2012, 07:33 PM
greenie99 greenie99 is offline
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I don't get that... But I wish I did
Bring it across the Delaware and we will make it work!
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  #6  
Old 11-25-2012, 07:53 PM
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Originally Posted by nwills View Post
lol...I enjoy it as well but it's almost too much! Every red traffic light I come to, the car gurgles and pops it's a little out of character for a luxury sedan (I have a 650 Gran Coupe).

I'm just a little surprised that it does it so much! I'll try and get a video to upload.
Ahh, you want luxury sedan, go 7 Series. This is a performance GT that happens to have two extra doors put on it

By the way, you do have M-Sport, correct?
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  #7  
Old 11-25-2012, 07:55 PM
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Bring it across the Delaware and we will make it work!
Does yours do that too? I hear a little exhaust but what I mainly hear sounds like transmission/engine whine when I downshift and come to a stop.
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  #8  
Old 11-25-2012, 07:57 PM
nwills nwills is offline
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Quote:
Originally Posted by Itinj6 View Post
Ahh, you want luxury sedan, go 7 Series. This is a performance GT that happens to have two extra doors put on it

By the way, you do have M-Sport, correct?
you're right!

And I'm by no means complaining about the backfiring! on the contrary!

I was more curious if this may be a concern.....I'm even considering a Meisterschaft EV....so exhaust noise is like music to my ears!

Yes, I do have the M-Sport pack.
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  #9  
Old 11-25-2012, 08:15 PM
greenie99 greenie99 is offline
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Originally Posted by Itinj6 View Post
Ahh, you want luxury sedan, go 7 Series. This is a performance GT that happens to have two extra doors put on it

By the way, you do have M-Sport, correct?
Yepper. 10mm spacers with AC Schnitzer rear spoiler.
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  #10  
Old 11-25-2012, 08:43 PM
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EmM HoLLa EmM HoLLa is offline
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I get that noise... I get a booming noise on the upshift and a bit of the gurgle on downshift when in sport mode... Music to my ears.. Beautiful music is what I like to call it.. Haha..
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  #11  
Old 11-25-2012, 09:14 PM
nwills nwills is offline
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Originally Posted by EmM HoLLa View Post
I get that noise... I get a booming noise on the upshift and a bit of the gurgle on downshift when in sport mode... Music to my ears.. Beautiful music is what I like to call it.. Haha..
I get the boom on up shift as well...gurgle and pops on downshift...lol pretty sweet soundtrack to my daily drive ;-)

Love it!!!
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  #12  
Old 11-25-2012, 10:16 PM
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southern6er22 southern6er22 is offline
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Originally Posted by greenie99 View Post
I would say that these cars run a bit lean. What you are hearing is a bit of unburned fuel in the exhaust system. I happen to like the sound and unless someone knows better, I wouldnt worry about it.
"Audi designed the system to put a drop of petrol into the exhaust whenever you shift gears. Using the planets natural resources to make changing gears sound better - I like that!" - Jeremy Clarkson (paraphrased).

lol. Not sure if this is what's happening here, but the M Sport provides that snap, crackle, pop that we love so much. Not exactly befitting of a luxury vehicle, but I'm okay with that. The F12/13 does a great job ticking the correct luxury and sporty boxes for different aspects of the car.
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  #13  
Old 11-26-2012, 04:58 AM
greenie99 greenie99 is offline
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Originally Posted by southern6er22 View Post
"Audi designed the system to put a drop of petrol into the exhaust whenever you shift gears. Using the planets natural resources to make changing gears sound better - I like that!" - Jeremy Clarkson (paraphrased).

lol. Not sure if this is what's happening here, but the M Sport provides that snap, crackle, pop that we love so much. Not exactly befitting of a luxury vehicle, but I'm okay with that. The F12/13 does a great job ticking the correct luxury and sporty boxes for different aspects of the car.
Sport/luxury!!!
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  #14  
Old 11-28-2012, 07:20 PM
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Itinj6 Itinj6 is online now
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Quote:
Originally Posted by southern6er22 View Post
"Audi designed the system to put a drop of petrol into the exhaust whenever you shift gears. Using the planets natural resources to make changing gears sound better - I like that!" - Jeremy Clarkson (paraphrased).
Sounds like an afterburning gas turbine engine lol.
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  #15  
Old 11-28-2012, 07:24 PM
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Originally Posted by greenie99 View Post
Yepper. 10mm spacers with AC Schnitzer rear spoiler.
Greenie, two questions...

1) How much wheel well clearance do you have with the 10mm spacers? When I measured, it looked like 15mm-20mm would work but 20mm would be cutting it really close. I ordered 15mm for rear and 12mm for front (wanted a more staggered look even though 3 mm is barely noticeable).

2) Where did you get the AC Schnitzel spoiler from and what did you pay? Factory direct?

Thanks in advance.
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  #16  
Old 11-28-2012, 08:15 PM
greenie99 greenie99 is offline
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Originally Posted by Itinj6 View Post
Greenie, two questions...

1) How much wheel well clearance do you have with the 10mm spacers? When I measured, it looked like 15mm-20mm would work but 20mm would be cutting it really close. I ordered 15mm for rear and 12mm for front (wanted a more staggered look even though 3 mm is barely noticeable).

2) Where did you get the AC Schnitzel spoiler from and what did you pay? Factory direct?

Thanks in advance.
Hockeyman, not sure about the clearance with 10 mm but its fine and by the looks of it, 12mm in the front will also be fine. Spoiler ordered by my dealer for me direct from AC Schnitzer in Germany.
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  #17  
Old 11-29-2012, 10:17 AM
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Hockeyman, not sure about the clearance with 10 mm but its fine and by the looks of it, 12mm in the front will also be fine. Spoiler ordered by my dealer for me direct from AC Schnitzer in Germany.
Thanks a bunch!
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  #18  
Old 11-29-2012, 08:34 PM
greenie99 greenie99 is offline
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Thanks a bunch!
You bet. Any time!
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