1997 E39 540i - Aftermarket exhaust only has soot in one tailpipe???

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  1. 1997 E39 540i - Aftermarket exhaust only has soot in one tailpipe??? 
    #1
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    I bought a new exhaust for my car, which cost me a pretty penny, and it's not really as loud as I'd expected.

    I chose it based on having a nice sound, not for all out noise, but it's very very quiet...makes less noise than the other exhaust I had on there, and strangely enough there is only soot in one of the tailpipes.

    I'm aware that there is a bedding in process, but I've covered 300 miles and really all I can hear is engine.

    If it wasn't for the increase in power I'd put the old one back on (it was a Simons exhaust and it howled and was raspy, which in retrospect I'm really missing!)

    The soot in one pipe only is the thing that bugs me...doesn't seem right, but them the company I bought it from hand make their exhausts and supply some top German tuners, so it also doesn't seem right that they'd make a mistake in manufacturing it.

    Any ideas?
    Peace, love, oversteer...
     
     

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    Ronnie (23-06-2011)

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    #2
    Rog
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    Can you feel any exhaust gasses coming out of the non-sooty tailpipe? What if you put your hand over the sooty one?

    May be they have made a mistake, or something has gone wrong inside the silencer, but a you say you have more power with it than your old one, this doesn't seem likely.
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    Maby it's because the preasure is on that side of the exhaust? I've found that on one of my systems, it favors the easiest way out
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    Ok so further investigation reveals that the left hand pipe is hotter, and has turned champagne colour which it is supposed to, but the other one is not discoloured and has no soot.

    It seems obvious that the exhaust gasses are taking the easiest way out...but having spoken to the distributor they assure me this is not normal.

    The thing that gives it away is the noise...I have the Race level system on mine and it should be quite pronounced, but in actual fact it is just very quiet.

    In any case the matter is being referred back to the manufacturer and is apparently the only time an issue like this has been reported.

    I'm convinced my car is the devil incarnate sometimes...but then I drive her and all is forgiven!!!
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    How's the centre exhaust configured on your new system? you could have a fuelling issue ob one bank that is causing the soot problem.
     
     

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    #6
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    I did wonder about that...

    There are are a pair of cats which seem in good condition...no rattles or anything, then there's a Y resonator which joins on to the backbox.

    I think if I had a fuelling issue it would have shown up in the
    recent diagnostic.
    Peace, love, oversteer...
     
     

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