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Thread: higher flow/uprated Z19DTH inlet manifold

  1. #1
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    Vehicle : astra

    Trim : sri

    Engine : 1.9cdti 193bhp

    Year : 2007

    Thumbs up higher flow/uprated Z19DTH inlet manifold

    new to the site guys and would like to share my findings with what ive done it may or may not have been done but here goes.

    new manifold was ordered and when i received it i unscrewed it and split it open and removed all the egr fins in the end and opened the apperature in the throttle body end were i could.



    as you can see from the picture what ive taken away, i cleaned it down and fitted it back together with a loctite sealant from halfrods 5610 i think if ya want to know ill find out for you.

    i used the how too off this site (thankyou very much) took me four hours to replace the manifold and its been on the car a week now and what an improvment over stock, i have fully blanked the egr with a full plate and just refitted that back on also swirl flaps are still in.#
    the car is now a different car again its like ive been back to the tuners for another remap.

    inlet manifold = restriction.

  2. #2
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    Perkinsville, County Durham
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    Trim : Sri nav

    Engine : Z19dth

    Year : 2006

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    You might be onto something there, but it'll be hard to prove if you've gained anything by modifying in this way.
    Or, thinking about it, by removing material from inside the manifold, you might have created a space that has to be taken up by your boost. Possibly causing slightly more lag.
    Im sure some turbo gurus will be along shortly.

  3. #3
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    Vehicle : astra

    Trim : sri

    Engine : 1.9cdti 193bhp

    Year : 2007

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    certainly no more lag exactly the opposite for me my car drives miles better now and more responsive

  4. #4
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    Trim : Sri nav

    Engine : Z19dth

    Year : 2006

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    How bad was the last manifold though?

  5. #5
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    Vehicle : astra

    Trim : sri

    Engine : 1.9cdti 193bhp

    Year : 2007

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    this bad

  6. #6
    Regular Member XPCobra's Avatar
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    Vehicle : Vauxhall Vectra Hatch

    Trim : SRI with added X-Pack

    Engine : 1.9 16v 150

    Year : 2006

    Mileage : Near 100K

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    Do you have any more pictures?

    Also did you smooth the internals of the inlet manifold or even 'port match' them?

  7. #7
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    Vehicle : Golf 7

    Trim : GTD

    Engine : 2.0 TDI 184PS

    Year : 2014

    Mileage : 40000

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    I always wondered if this was possible. Good work m8.

  8. #8
    Regular Member Даниил's Avatar
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    Vehicle : Vectra C

    Trim : sri nav/Elite

    Engine : CDTI 150

    Year : 56

    Mileage : 130ish

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    More pic's please

  9. #9
    Regular Member Big Red's Avatar
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    good work mate! looks quite a difference

  10. #10
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    Engine : 1.9cdti 193bhp

    Year : 2007

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    Pics of what exactly chaps come on chaps be specific...

    The main bits i did was to the throttle body end and all i did to the ports was smooth off and anfuler surfaces and msde them more smooth.

    Ill probably convert my old manifold.

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