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Thread: De-cat bad for the turbo?

  1. #1
    HIGGINS's Avatar
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    De-cat bad for the turbo?

    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

    Selling MY11 rear lights, message me for a price

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  3. #2
    Chugger

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    Not true, that's why turbos have a internal waste gate. Just sounds like somebody trying to be a know it all
    57 A3 2.0 TDI Sportback (140)

  4. #3
    HIGGINS's Avatar
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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

    Selling MY11 rear lights, message me for a price

  5. #4
    Chugger

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    What car is it? You don't get cats on diesels?
    57 A3 2.0 TDI Sportback (140)

  6. #5
    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)
    57 A3 2.0 TDI Sportback (140)

  7. #6
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    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
    TT-RS 410hp revo
    Fiat 500 1.3 tdi 120hp
    A3 8P 2.0tdi 240hp Autograph Cars
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    S3 8L 345hp MTM
    Volvo 850 T5 300hp BSR
    Fiat Punto GT 130hp
    Lancia Delta Turbo 185hp
    Lancia Beta Coupe 122hp
    Mini 74hp

  8. #7
    George 1982's Avatar
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    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 !

  9. #8
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    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. #9
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    Any need George? How is it?

    Would anyone know the turbo fitted to the 130 pd 2002 engine please?

  11. #10
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    Quote Originally Posted by Gaz! View Post
    Any need George? How is it?

    Would anyone know the turbo fitted to the 130 pd 2002 engine please?
    GT1749VA, read my above post...de-cat will work but do not expect it to last a lifetime !
    FOR SALE:
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    -audi a3 (1998 to 2003) genuine clutch slave cylinder to fit 1.6 engines BRAND NEW
    -Rear bush press tool to fit new rear axle bushes on Golf Mk3/4, Audi a3/S3, Seat Leon/Toledo, Skoda Octavia mk 1/2 used once

 

 

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