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Author Topic: Exhaust popping  (Read 577 times)

Offline mmret

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Exhaust popping
« on: August 20, 2011, 11:50:03 pm »
Its a moody sucker, that BMW.

On deceleration / upshifts (ie: every time the revs drop), the exhaust makes a popping noise. Fairly subtle. Now I have done some digging on the interwebs and it I have a bunch of posts saying its a lean condition, others saying its a rich condition, and the occasional "hole in exhaust" explanation.

But what is it really? And should I bother with it at all?
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Offline Railton

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Re: Exhaust popping
« Reply #1 on: August 21, 2011, 01:04:23 am »
Quote from: mmret on August 20, 2011, 11:50:03 pm
Its a moody sucker, that BMW.

On deceleration / upshifts (ie: every time the revs drop), the exhaust makes a popping noise. Fairly subtle. Now I have done some digging on the interwebs and it I have a bunch of posts saying its a lean condition, others saying its a rich condition, and the occasional "hole in exhaust" explanation.

But what is it really? And should I bother with it at all?
Are you referring to scavenging sounds or popping? Scavenging is a kind'a 'buzz' type sound. Popping I think is something else and more to do with unburnt fuel in the exhaust system. Both are harmless but people normally like their cars to pop - sounds like a race car. 8)
Railton
PS. BTW, back from watching Totem. Great show.
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Offline Sir Osis of Liver

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Re: Exhaust popping
« Reply #2 on: August 21, 2011, 01:37:16 am »
Popping on drop throttle is unburned fuel making it to the exhaust and igniting.

Is this about what you're hearing?

http://www.youtube.com/watch?v=t6FWiR7eG7k
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Offline mmret

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Re: Exhaust popping
« Reply #3 on: August 21, 2011, 10:55:56 am »
Quote from: Sir Osis of Liver on August 21, 2011, 01:37:16 am
Popping on drop throttle is unburned fuel making it to the exhaust and igniting.

Is this about what you're hearing?

http://www.youtube.com/watch?v=t6FWiR7eG7k

Nothing that extreme, but yes. A much "bassier" sound though. Guess its not a big deal. :)


Quote from: Railton on August 21, 2011, 01:04:23 am
PS. BTW, back from watching Totem. Great show.

Need to remember to get tix for that...

Thx gents.
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Offline Snowman

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Re: Exhaust popping
« Reply #4 on: August 21, 2011, 10:16:45 pm »
You don't want to be behind me when I up-shift under heavy acceleration in my Stage 2 STi  :)
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