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Old 09-29-2004, 07:04   #1 (permalink)
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What causes popping sound from exhaust?

As the title suggests im curious to know what cause that popping or crackling sound in your exhaust when you back off the throttle?? Most of you probably wont even get it but im thinking some that are running the larger exhaust systems may experinece it even a little.
When i first got my exhaust done it wasnt that bad but since installing the cai it seems to have gotten worse even inbetween gear changes it does it, i dont know whether its a case of it running a bit richer or just the exhaust itself.
Does anyone know what may cause it or know a cure for it??
Could it be a backpressure issue??
Im thinking of changing the rear resonator but im so happy with the way it sounds i dont want to alter the sound.

Cheers.
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Old 09-29-2004, 18:43   #2 (permalink)
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Re: What causes popping sound from exhaust?

Hi Fordy

Dunno but I get it too. Mine is auto with just Herrods cats back.

I don't mind the noise.

Jase
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Old 09-30-2004, 01:32   #3 (permalink)
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Re: What causes popping sound from exhaust?

Quote:
Originally Posted by Fordy
As the title suggests im curious to know what cause that popping or crackling sound in your exhaust when you back off the throttle?? Most of you probably wont even get it but im thinking some that are running the larger exhaust systems may experinece it even a little.
When i first got my exhaust done it wasnt that bad but since installing the cai it seems to have gotten worse even inbetween gear changes it does it, i dont know whether its a case of it running a bit richer or just the exhaust itself.
Does anyone know what may cause it or know a cure for it??
Could it be a backpressure issue??
Im thinking of changing the rear resonator but im so happy with the way it sounds i dont want to alter the sound.

Cheers.
Hi Fordy,
I think that would be a bit of unburnt fuel ignighting in the exaust due to the cams going out of phase as revs drop off your power band (eg. inlet/exaust valves opening at the same time) nothing to worry about. If you have ever been to see the V8 supercars listen to them back off, it sounds the same except 10X meaner because there is so much fuel going through the motor. If you exaust is fairly loud thats pretty normal, dont foget you have over 300 ponies under your bum!!!!
I reckon that sound is great!

Waderocks
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Old 10-19-2004, 01:53   #4 (permalink)
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Re: What causes popping sound from exhaust?

I got that sound on my AU just by putting straight thru mufflers on. I love the sound. Nothing to worry about mate. Just sit back and enjoy.
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Old 10-19-2004, 02:45   #5 (permalink)
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Re: What causes popping sound from exhaust?

From memory, you put Lukey,s didnt you cobra?? Must be a Lukey thing.
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Old 10-19-2004, 05:31   #6 (permalink)
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Re: What causes popping sound from exhaust?

i get it with my system, though just a little bit.

my motors stock though (NC 5 litre)
love the sound
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Old 10-19-2004, 06:11   #7 (permalink)
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Re: What causes popping sound from exhaust?

Quote:
Originally Posted by Fordy
Must be a Lukey thing.

i run a twin 2 1/2 inch system on my au xr8 with lukey race magnum mufflers and i get it too, more so when the motor is cold and you take your foot off the pedal ,i am guessing it has something to do with the fuel mapping when the engine is cold. as the engine heats up it is still present but not as loud i wish my engine ran cold all the time. I love the note so much especially when going through a tunnel or next to a concrete road divider.
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