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De-cat bad for the turbo?

Discussion in 'Diesel forum' started by HIGGINS, Dec 12, 2011.

  1. HIGGINS
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    HIGGINS Member

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    [Dec 12, 2011]
    Basically ill try and cut the story down.

    I have a custom straight through cat back and i went to my local exhaust place to get them to remove the cat. They basically said they can do it but it could destroy my turbo within half a year as it will be spooling up too quick.

    Is this true? :S

    Im sure theres ALOT of people with straight through pipes
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  3. sportstractor
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    sportstractor Chugger

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    [Dec 12, 2011]
    Not true, that's why turbos have a internal waste gate. Just sounds like somebody trying to be a know it all
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  4. HIGGINS
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    HIGGINS Member

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    I mean i didnt believe it really my self but i thought it must be true as they are an established exhaust centre :S

    So should i just get it done? :p
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  5. sportstractor
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    sportstractor Chugger

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    What car is it? You don't get cats on diesels?
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  6. sportstractor
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    sportstractor Chugger

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    Oh iv just been informed you do get cats, but they are different to petrol cats.

    I personally wouldn't remove it, unless you massively modding it ( ie bigger nozzles, custom map)
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  7. dunk
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    dunk Member

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    [Dec 12, 2011]
    Audi diesels have a cat, and you can remove it and still pass an mot. Removing it will improve flow, increase turbo spool and reduce turbo temps- particularly worth it if you use a hybrid turbo that usually spool slower cos of the heavier compressor wheel
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  8. George 1982
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    George 1982 Member

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    [Apr 17, 2012]
    I've just bought a decat for my 130 pd before I go in for a remap.....hope this line about killing turbos is wrong !
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  9. adamss24
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    adamss24 Well-Known Member

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    [Apr 17, 2012]
    Some small turbo's are known to surge and by removing the cat you experience "boost creep" which means the turbo overboosts even with the vanes fully closed ! Surging is very bad for turbo/engine as it can lift heads and snap the shaft which almost every time could lead to hydrolock !
    If you have a KP39 or Garett GT1749 Va i suggest you leave the cat in place ! I would remove the cat if you have a bigger, slower spooling turbo...
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  10. Gaz!
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    Gaz! Member

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    [May 14, 2013]
    Any need George? How is it?

    Would anyone know the turbo fitted to the 130 pd 2002 engine please?
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  11. adamss24
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    adamss24 Well-Known Member

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    [May 14, 2013]
    GT1749VA, read my above post...de-cat will work but do not expect it to last a lifetime !
    #10

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