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Thread: Cat converter blowing out its insides.

  1. #1
    Senior Member sam92's Avatar
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    Default Cat converter blowing out its insides.


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    I don't know how to put this but today when I was playing with wires to find the wire that is causing my car to run badly something weird happened

    Anyways after a lot of starting and stopping over a couple of days and the car failing to start half the time I got the wires in a position where the car would run fine and have it a rev and "bang" half the innards off the cat blew out the back every where. It's only a new cat done about 150km, does anyone know what may have caused this ?? I've had a look about and found a few mixed answers.

    Cheers

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    Senior Member Jip86's Avatar
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    When i had new high flow cats fitted to my "other" car the exhaust shop told me to not flog it for a couple hundred k's to heat cycle the cats as the metallic ones have to harden.

    I dont know if it was bullshit or not though.

    Excess fuel can apparently stuff them as well, they get to hot.

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    Veteran lolwat's Avatar
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    running issues getting MAD hot from running really rich, cheap CAT???
    its done half your job for you anyways bash the rest out

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    Senior Member sam92's Avatar
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    Right well there may be the problem it has been running very rich whilst playing up so that will have caused it then I think.
    other then being illegal which I don't care about is there any other problems it may cause like not getting enough back pressure etc and will I have to make sure I clear the rest out or just let it come out itself ?

    It's weird too the car seems slightly quieter now haha which is good as I need to add another muffler anyways.

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    Senior Member sam92's Avatar
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    The cat was a $100 high flow eBay job

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    Senior Member Jip86's Avatar
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    A car needing back pressure is a myth.

    Its probably quieter now because the cat is blocked, I'd gut it when you have a chance because its fucked anyway.

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    Veteran lolwat's Avatar
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    its not pressure, its all about gas speeds

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    Senior Member sam92's Avatar
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    Gayyyyyyy I have no flange there so ill have to cut it out to knock the rest out haha Owell the exhaust needs attention anyways I wanna tuck it up a little higher and add another muffler.

    Cheers for the info guys, its been really helpful.

  • #9
    Senior Member sam92's Avatar
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    I was gunna ask too man I'm adding another muffler and a mate gave me a 2.25" and I have a full 2.5" exhaust will the 2.25 at the back restrict it all all?

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    put it at the back

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