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Thread: Cdti pre cat removal

  1. #1
    Regular Member winnie2457's Avatar
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    Default Cdti pre cat removal

    Hi guys a few questions does my vec estate have a pre cat as well as the dpf?

    If yes where is it located?

    And is it easy to remove and drill the insides out to make it a straight through pipe like I did with my dpf which also is the cat too

    I can't see any trace of a pre cat in the underside of the car and is there any sensors on it could I knock the I sides out and is it easy to remove

    Cheers hope to hear soon guys thanks

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    Pre-cats are usually very close to the exhaust manifold (sometimes they are in the exhaust manifold). They need to warm up quickly so that they trap noxious gases when the engine is warming up. An unintentional side effect of the pre-cats is that they are actually beneficial to turbo reliability (work it out for yourself ).

    The 'cats' also reduce soot. Something to think about come MOT time.

    The 'cats' convert CO to CO2 and Hydrocarbons (a mixture of poisonous gases) to H2O and CO2. They also reduce soot emissions.

    They used to be very restrictive, but modern ones hardly affect performance or fuel economy at all. But that hasn't stopped people from removing them anyway.

    However, like any emissions device they don't do too well when asked to deal with unburnt fuel, so maybe that's why you want to remove it?

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    Regular Member mozzer99's Avatar
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    On my 2005 estate (150 CDTI) it appears the cat is part of the DPF. The DPF is in two halves internally, the first bit is the cat and the second bit the DPF.
    AFAIK or can see there is no other CAT or precat.
    If you look through the hole I drilled in the CAT you can see the DPF behind it.

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    There IS a pre cat, and like dd says, it's just after the turbo.

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    Regular Member winnie2457's Avatar
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    Ok so I must have one I know I have removed my dpf already so I now have no cat/dpf only one rear silencer I wish to get the exhaust as free flowing as possible

    So I wish to remove the pre cat and drill it out so it's straight through

    Question time lol

    Is the pre cat straight in shape so you can drill through

    How do you remove it. Is it a bumper off job and is it just bolted on like a flange both ends

    Has any one removed it in this way before on here thanks hope you guys can help thanks again

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    It sould be easy to drill/smash out. Just remove the splash guard, under tray thingy. There's 3 bolts holding it onto the turbo, then i'm sure that section leads back to a join just before the DPF.
    For the size of the pre-CAT, an exhaust place shouldn't charge more than £50 to replace. It's literally 250mm long.

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    Regular Member winnie2457's Avatar
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    i am servicing my car on thur night so i will have a good look at it then and see if i can remove it and gut the insides too cheers mally

    have you removed yours before??

    would i see better turbo spool up and more turbo whislte through the exhaust thanks

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    Regular Member winnie2457's Avatar
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    hi last night i had a go at this and i could not get the turbo heat shield off without taking off the bumper and i didnt want to start that so i took off the flexi exhaust from dpf to pre cat so i could see into the precat and it is only about 4inches long the actual cat part of it

    so i was going to drill through it in situ on the car to free up the flow abit but when i started drilling it is not the ceramic material as is the main cat which drills really easily it is like a metal honey comb which crushes rather than drills through.

    i now have a drill indent on my pre cat the size of a 5 pence which is blocking it a 5p size i dont think it will make much difference but should i try a sharper titanium drill and a smaller diameter to see if i can drill through

    i just cant get it off the car on my drive cheers

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    Regular Member winnie2457's Avatar
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    Bump thanks

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    Regular Member winnie2457's Avatar
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    Bumper bump lol

    Any on at all help menon my last post

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