73 SM EFI Restoration
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Thread: 73 SM EFI Restoration

  1. #1
    Fellow Frogger! citroenthusiast's Avatar
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    Default 73 SM EFI Restoration

    Not sure if Hemmings gets much circulation down under, so here is a shameless plug for the restoration I just finished:

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    The Mother of Invention - 1973 CitroŽn SM | Hemmings Motor News
    GreenBlood, 59 Floride and JohnW like this.
    Cheers,
    John T.

    54 11BL; 61DS19 LHM (son's); 71DS21 BVH; 73SM 3.0; 73SM 2.7EFI; 73SM 3.0 (other son's); 74 Maserati Merak

  2. #2
    1000+ Posts forumnoreason's Avatar
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    that's noyce mate! choyce! Especially the lamps.

  3. #3
    Fellow Frogger! flipperman's Avatar
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    The hardest part of reading a wonderful SM story is - i want one
    Last edited by flipperman; 29th March 2016 at 01:46 PM. Reason: spelling
    CitroŽn's that own me

    - 2008 C5 X7 Tourer (Estate) 2.7 DoubleTurbo Diesel UHZJ - V6.

    CitroŽn's that formally owned me

    - 1990 BX TRI Estate Manual. .. . "Phoenix" - "Donated to Science"
    - 1990 BX TRI Estate Auto. (Traded In)
    - 1987 BX TRI Hatch.

    -------------------------------------------------------------
    Australian Citroen BX - All about the Citroen BX in Oz
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  4. #4
    UFO
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    Well done! Brag all you like
    Craig K
    2009 C5 HDi Exclusive

  5. #5
    Too many posts! JohnW's Avatar
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    We drove through Phoenix a few years ago. Missed it!! Lovely, as ever, and I will always want one.
    JohnW

    Renault 4CV 1951
    Renault R8 1965
    Renault Scenic 2005 (wife's)
    Renault Scenic 2007 (mine)
    Renault Scenic 2006 (daughter's)
    CitroŽn CX Pallas 1980

    National Co-ordinator, Renault 4CV Register of Australia

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    omg.......that is gorgeous! It really is

  7. #7
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    How stunning. I love those wheels. Really nice restoration. Chris M

  8. #8
    1000+ Posts Ken W's Avatar
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    Citroenthuiast, Well done

    You have obviously put an aftermarket ECU onto this engine. How does it time when to do its fuel injections? Does it control ignition timing as well or is that wholly handled by the substitute distributor? If the ignition timing is ECU controlled, how has the crankshaft sensor been mounted so it knows when to oddfire?

    Cheers, Ken W

  9. #9
    Fellow Frogger! citroenthusiast's Avatar
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    The ECU controls fuel only. It batch fires the injectors (just like the D-Jet did) based on the tachometer signal. The Pertronix ignition module handles the spark, but otherwise the distributor is stock (except there was no need for the SEV D-Jet trigger points). The Microsquirt ECU could have handled ignition timing, but that would have required modifying the distributor to lock out the flyweights (e.g. welding things together) and, with the odd fire engine I still would have had to settle for batch fired injectors. It is possible to get full sequential injection and ignition timing control, but to do that you need to mount a 36:1 sprocket on the jackshaft. That of course is not as accurate as a flywheel sensor, so to really do it right, you need a sensor on the jackshaft (for TDC #1) and a crank sensor, both of which would be visible and difficult not to look homemade.
    Cheers,
    John T.

    54 11BL; 61DS19 LHM (son's); 71DS21 BVH; 73SM 3.0; 73SM 2.7EFI; 73SM 3.0 (other son's); 74 Maserati Merak

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