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    Stock igniter trigger

    I am in the process of finishing my MS assembly (I finally had time to come back to it) and I will be using external igniters to fire 2 coils (wasted spark). Does anyone know what voltage the stock igniters require to be triggered? In the FSM, page G15, it looks like a ground switching circuit but I'm not sure.

    Any thoughts would be appreciated,

    Thanks

    #2


    Here's the map I made up when I installed my MS. I use a wasted spark ingniter but it'll work the same with two.

    I hope that helps...

    94 Protege LX: HX-35, Megasquit, ect...
    98 Subaru Legacy GT-DD: 1 inch lift, and all the standard N/A stuff.

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      #3
      Thanks,

      The external wiring is not a problem, I will simply use 2 stock igniters outside the MS triggering them through pins 36 and 6 (spare 4). What I need is the internal circuit in the MS. I don't feel too confident connecting the 2 spark pins of the ECU directly to the igniters. Basically, I want to know what you did inside the MS to drive these igniters, what is the circuit between the CPU pins and the DB37 connector.

      Thanks

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        #4
        I'm 99% sure they're 5V ignitors. If they are, you'll need a pullup resistor on the spark outputs. Try a 1k resistor, tying it to 5V. That should do it.
        Ask me about engine management!

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          #5
          Oh sorry...yes I used a 1k pullup resistor for each igniter. If it's a Mazda igniter (Mitsubishi) a 1k pullup should work just fine.

          94 Protege LX: HX-35, Megasquit, ect...
          98 Subaru Legacy GT-DD: 1 inch lift, and all the standard N/A stuff.

          Comment


            #6
            Ok, I'm a bit confused about this. From the following diagram, it looks like the igniter is inverse logic, meaning that the ecu holds the voltage at 5v and goes to 0 to trigger the igniter, it's active low. Is this right?

            In that case, I will just tap the output between the LEDs and the Q6 (and Q8) transistors since the circuit is already there and add a 1K pull up resistor. Does that make sense?

            Edit: I don't even need the pull up resistor, 4.3 Volts will be enough to power the igniters anyways.?!?!
            Last edited by 323driver; 07-28-2008, 08:58 AM.

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              #7
              Here is the FSM diagram

              Click image for larger version

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                #8
                Anyone can confirm?

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                  #9
                  Yes that is right...

                  I did my mods according to diyautotune.com's miata write up.

                  94 Protege LX: HX-35, Megasquit, ect...
                  98 Subaru Legacy GT-DD: 1 inch lift, and all the standard N/A stuff.

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