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Thread: Tell Me About the Z20NET Diaphragm

  1. #1
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    Default Tell Me About the Z20NET Diaphragm

    Further to this thread:
    http://www.vectra-c.com/forum/showth...ol-Valves-POLL
    and what seems to be limp home mode cutting in, although still no spanner symbol, several of you have suggested it might be the diaphragm.

    Where is this in relation to the turbo? Is it the bit I've drawn an arrow to in the below pic (borrowed from the Z20NET spec sheet)? What does the diaphragm do? And does anyone have the part number for the repair kit and info on how to fit it? Thanks.

    Z20NET diagph.jpg

  2. #2
    Full Member Caveman_nige's Avatar
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    Vehicle : Vectra and a Signum

    Trim : top of the line in both

    Engine : Z18XE,Z19DTH,Z20NET

    Year : 2006

    Default

    the part you have arrowed is the wastegate actuator not the diaphragm. The wastegate diaphragm sits in the housing on the side of the turbo. you can take it off to inspect it..

    you can see it here with its three mounting bolts on the side of this Mitsubishi tdo4l14t
    vec%u00252520sales%2520003.jpg

    this a wastegate diaphragm (the black rubber part)
    IMG_2071.JPG
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    My old Signum, the animal; she now rests in pieces in several other members cars.. https://www.vectra-c.com/forum/garag...vehicle&id=200
    The wifes vec show car, started as a standard daily driver and ended up like this. https://www.vectra-c.com/forum/garag...vehicle&id=709



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    Finally had the spanner symbol come up, so retrieved the fault code: P0245, or "Turbo/Super Charger Wastegate Solenoid 'A' Low". So definitely looks like a wastegate issue, but as I'm going too replace the diaphragm and spring, I hope the fault code isn't trying to tell me it's the solenoid that opens and closes the flow of air to the wastegate actuator rather than the actuator itself...

  4. #4
    Regular Member beat275's Avatar
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    Vehicle : Hatch

    Trim : SRI

    Engine : 2.0T

    Year : 2003

    Mileage : 90000

    Default

    Mr nige where can you get the diaphragm from?

  5. #5
    Full Member Caveman_nige's Avatar
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    Vehicle : Vectra and a Signum

    Trim : top of the line in both

    Engine : Z18XE,Z19DTH,Z20NET

    Year : 2006

    Default

    A bloke on here found a replacement on ebay a couple of months ago. I think his was the td04 though. Somewhere like crturbos will probably sell them as well.
    My old Signum, the animal; she now rests in pieces in several other members cars.. https://www.vectra-c.com/forum/garag...vehicle&id=200
    The wifes vec show car, started as a standard daily driver and ended up like this. https://www.vectra-c.com/forum/garag...vehicle&id=709



  6. #6
    Full Member Caveman_nige's Avatar
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    Vehicle : Vectra and a Signum

    Trim : top of the line in both

    Engine : Z18XE,Z19DTH,Z20NET

    Year : 2006

    Default

    the more i think about this the more i reckon that these are almost generic, it would just be the spring that is set to the turbo. of course you buy different springs but these will cause errors as the map is expecting a certain boost curve. the boost solenoids would throw up a P0245 code or similar and probably dump you into limp mode.

    I played around with a Forge wastegate for these turbos and it caused no end of trouble with no gains. I could have had the map altered to cope with it but it was not worth it.

    this is for a mitsubishi turbo, now don't hold me to it but i would bet that that diaphragm would fit your Garrett GT2052.. I would speak to Craig at crturbo first though.
    http://www.ebay.co.uk/itm/Turbo-Rebu...item19b838104d
    My old Signum, the animal; she now rests in pieces in several other members cars.. https://www.vectra-c.com/forum/garag...vehicle&id=200
    The wifes vec show car, started as a standard daily driver and ended up like this. https://www.vectra-c.com/forum/garag...vehicle&id=709



  7. #7
    Regular Member beat275's Avatar
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    I had a look at crturbo and could find the Garrett

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    Default

    I've got the diaphragm repair kit now - £83 for two pieces of plastic, a spring and a paper gasket seems pretty silly, but it's better than the £173 list price or £150 trade price.

    Anyhows, does anyone who has replaced the diaphragm on the Garrett have any advice they can give for doing the job without removing the turbo? Thanks.

  9. #9
    Full Member Caveman_nige's Avatar
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    Vehicle : Vectra and a Signum

    Trim : top of the line in both

    Engine : Z18XE,Z19DTH,Z20NET

    Year : 2006

    Default

    i have taken mine off while the turbo is fitted.. Remove the air instake pipe to the compressor side and you will feel the wastegate housing below it on the compressor (see pic 1 above in post 2)..

    its three 10mm bolts, easy to undo with a small ratchet and small extention froom either the top or the below..
    My old Signum, the animal; she now rests in pieces in several other members cars.. https://www.vectra-c.com/forum/garag...vehicle&id=200
    The wifes vec show car, started as a standard daily driver and ended up like this. https://www.vectra-c.com/forum/garag...vehicle&id=709



  10. #10
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    Well, after 2.5 hours of working in the cold, I've fitted the new bits and it's worked! Took it for a test drive and went to 5000 RPM and it's working great.

    Thank you to everyone who made suggestions - especially Caveman_nige, Ian Highlander and Deztroyer.

    The old diaphragm was completely intact, which had me worried that replacing it wasn't going to solve anything, but it must therefore have been a weakened spring that was the cause.

    On the downside, it's a biatch of a job to do simply because access is so poor; I've got scratches all along my wrists and forearms from catching them on various sharp bits of metal at the back of the engine bay.

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