CX GTi Turbo 1 versus 2?
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  1. #1
    Fellow Frogger! marc61's Avatar
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    Default CX GTi Turbo 1 versus 2?

    I've got to change the turbo on my Turbo 2, it's just about had it, oil is getting by the bearing. I've got hold of a very good turbo but it's from a Turbo 1, a 1984 date stamp as opposed to my 1987. As far as I can tell from staring at the one on the car they are the same, but could someone confirm if their swappable before I set to.

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    I can see there's another little air connection pipe on the Turbo 1 compressor outlet thats meant to go up to the wastegate but that's not present on the Turbo 2. If the compressor housing is otherwise the same, I was thinking I could just swap that over once I get the old one off?

    Cheers

    Marc
    Cheers, Marc.

    1987 CX GTi T2 Maikonics
    1972 SM 2.7 carb
    1972 DS21 EFI

  2. #2
    Real cars have hydraulics DoubleChevron's Avatar
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    There both T3 garetts aren't they Just throw a new core in it That's what I am going to do someday when I have some spare $$$ ..... I think you may find the output housing is different on the Turbo II, the turbo 1 has a solid pipe with "O"Ring that runs upto the inlet manifold. The Turbo II had a hose and hose clamps and runs over to the intercooler.

    eg:

    Turbo spares items - Get great deals on Turbo Rebuild, Reconditioned and Remanufactured Turbochargers items on eBay Stores!

    You would just need to verify which core you need to buy.

    seeya,
    Shane L.
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  3. #3
    Fellow Frogger! IE23's Avatar
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    Rebuilding the existing turbo was relatively easy straightforward and no fuss by a turbo specialist. The removal and replacement job all up was only 3 times harder than I imagined. So not too bad for a novice.

    However the major stumbling block was the smallest part. The O ring that Shane has mentioned above. I had to hunt the planet for this ring. Talk about Lord of the Rings! No one was able to make one and there were none available anywhere. In the end I had to purchase the last turbo engine sealing set from Westernhemispheres.com USA, which included this magical ring.
    I hope you don't go through the anxiety I did.


    Adrian

    _________________

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    Xantia V6 Exclusive Auto 2000


    Past;

    CX25 GTI Turbo series 1 1985
    DS23 IE Pallas 5sp 1974
    CX25ie Pallas Auto 1984 Parts
    2CV 1988
    CX25ie Pallas Auto 1984

  4. #4
    Fellow Frogger! marc61's Avatar
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    Thanks, at least I avoid needing that ring on the Turbo 2.

    I've measured the OD of the compressor outlet and it's bigger than the T2. Its got .42 cast on it, so presumably that means the A/R ratio is 0.42, but I can't see anything similar on the T2 one. Did Citroen state the compressor A/R ratio for the turbos somewhere, did they change from T1 to T2? I've had a search but can't find.
    Cheers, Marc.

    1987 CX GTi T2 Maikonics
    1972 SM 2.7 carb
    1972 DS21 EFI

  5. #5
    1000+ Posts Ken W's Avatar
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    Marc,

    The turbo CXs in Australia are all private imports. They were never imported for sale in Australia so there are not many around. However you are picking up some info.

    Cheers, Ken

  6. #6
    Member mork63ukCGAT's Avatar
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    just so this can be found in future searches, I've rebuilt quite a few CX turbochargers, In my experience the core units are the same. Simple terms I've swapped over T1 to T2 plus T2 to T1 compressor housings successfully on Garrett units.
    Might be worth a physical check of the compressor wheel diameter and height once the housing is off, just in case someone has erm, made a hybrid of it.

    Hope this helps.

  7. #7
    Fellow Frogger! marc61's Avatar
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    Thanks for that Neil, much appreciated.

    Cheers

    Marc
    Cheers, Marc.

    1987 CX GTi T2 Maikonics
    1972 SM 2.7 carb
    1972 DS21 EFI

  8. #8
    Fellow Frogger! marc61's Avatar
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    Just for info having now swapped the compressor housing and fitted the turbo, the T1 and T2 turbos appear identical apart from the compressor housing - the T1 has a bigger mouth and an extra port on the air intake side that goes up to the wastegate.

    It took me just over 4 hours. The bolts onto the manifold didn't want to come off but other than that it wasn't too bad, access isn't too bad for a Citroen. I'm now waiting for a pressure gauge to arrive so I can check the boost pressure.

    I also noticed the A/R ratios are the same (0.42 compressor, 0.48 turbine), which is the same spec as on the 2WD Ford Cosworth. Presumably the CX and Cosworth had very similar turbos as standard fitment, before the Cosworth guys started fitting T3/T4 hybrids to get more power.

    Cheers

    Marc
    Cheers, Marc.

    1987 CX GTi T2 Maikonics
    1972 SM 2.7 carb
    1972 DS21 EFI

  9. #9
    Fellow Frogger! IE23's Avatar
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    When I had mine rebuild ETS (Eastern Turbo Services) offered to increase the boost, however I declined because I wasn't sure what else would need to be modified on the EFI/ECU side. So it is as factory standard.
    I think my waste gate needs checking now because its making wooing noises too often.


    Adrian

    _________________

    Current;

    Xantia V6 Exclusive Auto 2000


    Past;

    CX25 GTI Turbo series 1 1985
    DS23 IE Pallas 5sp 1974
    CX25ie Pallas Auto 1984 Parts
    2CV 1988
    CX25ie Pallas Auto 1984

  10. #10
    Fellow Frogger! marc61's Avatar
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    Quote Originally Posted by IE23 View Post
    When I had mine rebuild ETS (Eastern Turbo Services) offered to increase the boost, however I declined because I wasn't sure what else would need to be modified on the EFI/ECU side. So it is as factory standard.
    I think my waste gate needs checking now because its making wooing noises too often.
    That noise is probably indicating that the black plastic air bypass valve mounted near the air filter needs replacing. I think it's got a diaphragm inside that eventually leaks. It's a Bosch part - think I fitted a used one from a Saab turbo when mine failed.
    Cheers, Marc.

    1987 CX GTi T2 Maikonics
    1972 SM 2.7 carb
    1972 DS21 EFI

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