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Thread: Running rich after decat install

  1. #1
    Test Passed Harmchar's Avatar
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    Default Running rich after decat install

    For the people that fitted decats, did anyone else have an issue with running rich and extra petrol smell coming from exhaust afterwards. I realise I should have a remap after putting on the decat pipe, but need to purchase an oversize intercooler before I remap. Hoping that will happen soon (still got some xmas money squirrelled away).
    Cheers.

  2. #2
    Site Owner MINI William's Avatar
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    You’ll get the smell of extra exhaust fumes as they aren’t being burnt off in the cat
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  3. #3
    Super Moderator Eddie_JCW's Avatar
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    Quote Originally Posted by MINI William View Post
    Youíll get the smell of extra exhaust fumes as they arenít being burnt off in the cat
    This ^^^^

  4. #4
    Super Moderator Eddie_JCW's Avatar
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    It's the one thing I miss about not having a decat, I love the smell

  5. #5
    Super Moderator Alasdair JCW's Avatar
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    Quote Originally Posted by Harmchar View Post
    For the people that fitted decats, did anyone else have an issue with running rich and extra petrol smell coming from exhaust afterwards. I realise I should have a remap after putting on the decat pipe, but need to purchase an oversize intercooler before I remap. Hoping that will happen soon (still got some xmas money squirrelled away).
    Cheers.
    As William and Eddie have said you'll notice more fumes as, without the CAT, there's less filtration in the exhaust to take the harmful stuff out.

    You'll likely also find that a remap increases the fumes, but not by as much, as the remap will likely up the fuelling at certain points in the rev range. I certainly noticed on one of my previous cars that there was a stronger smell of petrol after having it remapped.
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  6. #6
    Site Owner badwolf340's Avatar
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    I realise I should have a remap after putting on the decat pipe, but need to purchase an oversize intercooler before I remap

    You don’t need a remap or a bigger I/C but they would help so don’t be put off
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