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Thread: Exhaust help

  
  1. #1
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    ForZiE's Avatar
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    Exhaust help

    Fitted the remus pipe to the magnex backbox ....

    Finnaly got it fitted and not blowing anywhere!!!

    But basically sounds ok on revving up and tick over and going along.
    But when its de accelrating sumtimes it sounds really tinny and backfires and pops a bit...

    Is this becuase its straight from the CAT back and only the 1 box?

    or

    Is it because the backbox baffels could be worn out?

    Thanks for any help guys
    Astra Mk4 GSi in Ardon BLUE
    "HAS IT GOT BOOST"

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    could this be a new backbox needed maybe :S ?
    Astra Mk4 GSi in Ardon BLUE
    "HAS IT GOT BOOST"

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    Ffoeg's Avatar
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    All the cars I've owned do this on overrun to some extent - your probably just hearing it now because of the reduced/different silencing properites of the new pipe.

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    took the car to my local garage and they reckon the baffels are on the way out which will be creating the backfire noise
    Astra Mk4 GSi in Ardon BLUE
    "HAS IT GOT BOOST"

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    Haven't you got a magnex b/box and a straight centre pipe??

    PMSL - there ain't no baffles in there.

    (Moral - never listen to garages)

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    whats inside the magnex box then?
    Astra Mk4 GSi in Ardon BLUE
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    A straight through pipe with loads of wee holes in it and the rest of the can is packed with sound absorbtion material.

    If you should be able to see through it (assuming the pipe is straight)

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    yea thats true...

    Just backfires to much and dont sound nice...

    Any suggestions m8
    Astra Mk4 GSi in Ardon BLUE
    "HAS IT GOT BOOST"

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    just spoke to dannysports bout it and might have got it sorted

    Thanks for your advice ffoeg....
    Astra Mk4 GSi in Ardon BLUE
    "HAS IT GOT BOOST"

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    You shouldn't really get popping on overun, as the management system cuts the fuel supply on overun.
    It will sound louder on overun, as they all do.

    As FFOEG said, you probably notice it now as the boxes are Straight-through, without baffles to restrict flow, so everything will sound louder as more gas flow.

    Popping is usually a sign that you have a leak at one of the joins in the pipes.
    My mk3,117K, and the engine is still going strong
    shame about the car shell tho,lol.

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