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  • #31
    Originally posted by IsaacHayes View Post
    Batch (MPFI) fires one bank at a time. So 135, 246. IIRC.
    The P4 style GM ECMs (7730, 7727, etc) fire all injectors at the same time. In many of these ECMs (7730, 7727) there is only a single injector driver, 7749 has two, but this is used to spread the load of low impedance injectors over more components (injector drivers) to keep them cooler.

    I believe the MS is capable of true bank to bank fire, and would split the cylinders up in 135 on one driver a 246 on the other. I would set it up this way because of the firing order being 1-2-3-4-5-6 on these engines, which means the firing pattern steps back and forth from bank to bank.

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    • #32
      I am considering using a COP. How many teeth are on the crank wheel? Does anyone know off hand?
      1992 Isuzu Rocket ™ 2.3 LGO
      JI chassis by Isuzu
      Powered by Oldsmobile
      Brains by Megasquirt
      Built my Me

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      • #33
        Originally posted by malachi View Post
        I am considering using a COP. How many teeth are on the crank wheel? Does anyone know off hand?
        OEM 660 reluctor wheel?

        That would be 6+1.

        6 even spaced at 60* intervals, and one that is 10* after TDC #1.

        EFI, Fuel Injection, Auto, automotive, car, TPI, computation, ECU, MegaSquirt, GPIO, MicroSquirt, Sequencer, stim, MegaShift, MShift, DIY, transmission, 4L60E, 4L80E, controller, shifter

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        • #34
          Thanks man. I am not sure if I wanna use a COP from a Saturn, or the coil pack from a Catera, which is the same thing but in one unit.
          1992 Isuzu Rocket ™ 2.3 LGO
          JI chassis by Isuzu
          Powered by Oldsmobile
          Brains by Megasquirt
          Built my Me

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          • #35
            Originally posted by malachi View Post
            Thanks man. I am not sure if I wanna use a COP from a Saturn, or the coil pack from a Catera, which is the same thing but in one unit.
            Do the Saturn COP use a built in igniter? I'm trying to find some COPs that don't.

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            • #36
              It uses an ignition cassette. it would only fit the 3.0 VUE/L Series motors.
              As I understand it you just use 3 IGBT's on the MS board to fire them.
              The Catera is the same thing. It batch fires also. The COP in the Saturn is basically a 3 coil set up. Each plug may have its own coil but 2 fire at once.
              The Catera is a single large coil pack doing the same thing.
              4 wires total. 1 power and 3 ground signals from the MS. The COP is identical....just that it splits the signal before the coils.
              I really wish I could find an ignition module with a 60-2 firing set-up. something stand alone rather than wiring into the MS.
              BTW...the reason so many things for me, is I am working on a few projects in my mind still.
              1992 Isuzu Rocket ™ 2.3 LGO
              JI chassis by Isuzu
              Powered by Oldsmobile
              Brains by Megasquirt
              Built my Me

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