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Thread: Will my DTI pass its MOT after a De-cat?

  1. #1
    Regular Member Innes's Avatar
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    Default Will my DTI pass its MOT after a De-cat?

    I'm after a definate answer before I decide to De-cat.

    I've seen a thread where someone said the MOT doesnt do emmisions on Diesels but its more about how smokey/hazey it is.

    Who has de-catted their DTi and passed through their MOT here?

    Anyone here does MOTs for a living?

  2. #2
    Admin & Membership Manager bigmac's Avatar
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    Vehicle : insignia

    Trim : irmscher

    Engine : 2.0 cdti

    Year : 2009

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    Ive been told it will pass as i was going to do my old Dti apparently diesels only get tested for smoke test not emissions

    Irmscher Insignia CDTI 130

    MOD'S...Irmscher front spoiler, Irmscher mats, Irmscher door pins, Irmscher rear spoiler, Irmscher grille, Irmscher skirt & exhausts,Irmscher Roof spoiler MOD'S TO COME..Side skirts,Wheels

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    Vehicle : Vectra

    Trim : VXR

    Engine : 2.8 T V6

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    Got my 2.2 DTI running with a decat and passed without a hitch..

    As bigmac said.. diesels only get a smoke test, not an emissions test as they don't produce the noxious gases that the cat converter breaks down anyway, so it would be a pointless exercise.. that, and legally speaking, a diesel doesn't have to have a cat converter aslong as the exhaust remains complete!

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    Regular Member si_hoss's Avatar
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    So what does a cat do on a diesel then? Apart from slow the gases down and cost a fortune when they break??

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    Vehicle : Vectra

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    Quote Originally Posted by si_hoss View Post
    So what does a cat do on a diesel then? Apart from slow the gases down and cost a fortune when they break??
    Absolutely nothing.. the exhaust sytems on cars are somewhat standard to the car model and it is just the engine that is changed, which is why diesels have cats.. just makes for an easier life for the manufacturing team!

    And in a diesel.. a cat won't (or at least shouldn't.. I'm sure there are garages out there tricking unsuspecting people into thinking that theirs has) break as they aren't used

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    Regular Member si_hoss's Avatar
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    Quote Originally Posted by The_Kink View Post
    Absolutely nothing.. the exhaust sytems on cars are somewhat standard to the car model and it is just the engine that is changed, which is why diesels have cats.. just makes for an easier life for the manufacturing team!

    And in a diesel.. a cat won't (or at least shouldn't.. I'm sure there are garages out there tricking unsuspecting people into thinking that theirs has) break as they aren't used
    I LIKE what I'm hearing I'm due to service mine this weekend so may take the hammer to it as well

  7. #7
    Admin & Membership Manager bigmac's Avatar
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    Vehicle : insignia

    Trim : irmscher

    Engine : 2.0 cdti

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    Diesel cats use O2 in the exhaust gas stream to convert carbon monoxide to carbon dioxide and hydrocarbons to water . These converters often operate at 90 percent efficiency, virtually eliminating diesel odor and helping to reduce visible soot.

    However no cat can get rid of all the soot so thats why after 2007 they introduced A soot trap ---> diesel particulate filter (DPF)

    Irmscher Insignia CDTI 130

    MOD'S...Irmscher front spoiler, Irmscher mats, Irmscher door pins, Irmscher rear spoiler, Irmscher grille, Irmscher skirt & exhausts,Irmscher Roof spoiler MOD'S TO COME..Side skirts,Wheels

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    Vehicle : Vectra

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    I actually found that after removing the cat from my DTI my car kicked out a little less soot when I put my size 12 boot down.. probably because my cat was filled with soot and kept spitting it out, or maybe I just imagined it haha

  9. #9
    Regular Member Innes's Avatar
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    So the Cat gets rid of smell as well? If I de-cat is it going to pong then?

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    Trim : SXi

    Engine : 2.2


    Default

    You do not need a cat on a diesel

    Whats it going to pong of?

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