Info required - R21/R25 unleaded inlet manifold ports
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Thread: Info required - R21/R25 unleaded inlet manifold ports

  1. #1
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    Default Info required - R21/R25 unleaded inlet manifold ports

    Hi all,

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    Would like to glean some information from those who have done this conversion, or, have the knowledge.

    Many moons ago I grabbed a head/manifold/loom from a fellow frogger.
    Was led to believe the whole shebang was from a 21.
    Same as the R25 S2?????

    A finger has been pulled out and am starting the work to graft the bits onto the Fuego.
    Since I did not pull the head etc, I have no knowledge of where the vaccuum lines go to.

    Could anyone provide me with the details of where:
    Red port A, Blue port B, Yellow port C, Lime port D, Black port E (brake booster?), Lilac Port F=fuel regulator & Orange port G attach to???
    Note G is mega compared to the others.

    Will do some more reading whilst the bibs & bobs are soda blasted then painted?

    Thanks all.

    Info required - R21/R25 unleaded inlet manifold ports-inlet-info-1.jpg


    Info required - R21/R25 unleaded inlet manifold ports-inlet-info-2.jpg

  2. #2
    1000+ Posts bowie's Avatar
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    They are all sources of vacuum right?

    Don't suppose it matters too much, just connect the things you have that require a vacuum line? What things do you have that need a vacuum source?

    -Brake Booster
    -PCV system (perhaps there are couple inlets here that come of the head)
    -Fuel regulator

    Is there much else that requires a vacuum reference?

    Works: 2003 YV Commodore (That is Cecil to you)
    Playing: R12, SuperPos, thinks It's a race car and Sunny the R12 Lego set.
    Previous: SuperGrumpy fuel spitting 504ti(ish), SuperComfortable 505 STI, SuperDoper carried my groceries Mi16, Choo Choo'd Volvo S40
    Wanted Will hoard 12/15/17 Junk.

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  3. #3
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    Just to raise a note here - it is just me assuming that the R21 & R25 S2 unleaded EFI systems are the same here.

  4. #4
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    Quote Originally Posted by bowie View Post
    Don't suppose it matters too much, just connect the things you have that require a vacuum line? What things do you have that need a vacuum source?
    -Brake Booster
    -PCV system (perhaps there are couple inlets here that come of the head)
    -Fuel regulator
    Is there much else that requires a vacuum reference?
    Thanks Bowie for the thoughts.
    Yes they are the usual suspects, but would be good to know why there are so many take offs before discounting them.

  5. #5
    1000+ Posts bowie's Avatar
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    Providing you get the major stuff, I reckon you will ok. There PVC system is probably complicated that explains all the other reference points?

    Works: 2003 YV Commodore (That is Cecil to you)
    Playing: R12, SuperPos, thinks It's a race car and Sunny the R12 Lego set.
    Previous: SuperGrumpy fuel spitting 504ti(ish), SuperComfortable 505 STI, SuperDoper carried my groceries Mi16, Choo Choo'd Volvo S40
    Wanted Will hoard 12/15/17 Junk.

    "More and more of less and less" - Marina Abramović

  6. #6
    1000+ Posts jo proffi's Avatar
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    Quote Originally Posted by bowie View Post
    They are all sources of vacuum right?

    Don't suppose it matters too much, just connect the things you have that require a vacuum line? What things do you have that need a vacuum source?

    -Brake Booster
    -PCV system (perhaps there are couple inlets here that come of the head)
    -Fuel regulator

    Is there much else that requires a vacuum reference?
    Renix injection uses a MAP sensor.
    This is the primary sensor giving load information to the ECU.

    I have a book somewhere with a great diagram of all the lines, and another with the Pin outs of the loom and the ECU.
    Pretty sure I've posted them before, but in any case I'll look for it and if it turns up I'll post a pic.
    To have these diagrams is really the only way to do this job.

    Jo
    Kenfuego and bowie like this.

  7. #7
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    Thanks Jo.

  8. #8
    1000+ Posts jo proffi's Avatar
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    Inputs on the manifold that i remember,
    Map sensor and carbon canister control going to ecu box and connecting to ecu controlled solenoid valves. Small lines
    Carbon can purge line
    Fuel pressure regulator
    Brake booster
    Heater control valve plenum thingy (for those canisters that open and close heater flaps)
    Small pcv line goes to yellow port on to rocker cover ( big one goes from rocker cover to atmo side of throttle)

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