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Injector firing sequence?

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    Injector firing sequence?

    Can anyone tell me if the SETA injectors fire in batched or sequential configuration?
    I think I remember reading that cylinders 1,2,3 & 4,5,6 fire separately in a batched configuration but I'm dot positive.

    #2
    The injectors are grouped in two banks of three. So each injector firing pulse will open three injectors. The engine does not do per cylinder sequential injection, like later BMW's.
    The car makes it possible, but the driver makes it happen.
    Jim Levie, Huntsville, AL

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      #3
      Am I correct then in my recollection that the injectors for cylinders (1,2,3) fire as a batch, and (4,5,6) are grouped as a second batch?

      Also, are our injectors grounded and receive power to trigger, or do they receive constant power and a switched ground signal to trigger?

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        #4
        Motronic 1.3 cars are semi sequential - meaning they are timed to the combustion cycle of the engine, but only in a batch of two. that is what the impulse sensor on the #1 plug wire is for.

        they do recieve constant power and are fired by grounding them.

        also, the batches are 1,3,5 and 2,4,6
        Build thread

        Bimmerlabs

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          #5
          Thanks for the info.

          I’m still working on my ITB setup, and while I wait for my ‘i’ head to be shipped to me, seized at customs, returned to sender, and resent to me, I thought I might bastardize a 12 injector set up just using a series of relays to trigger my GSXR1000 injectors in tandem with the factory set. Why? You might ask…. Just for fun really. I have a fuel piggyback installed to dial back the overabundance of fuel this would create (over and above the small amount of extra fuel I’ll need to run the ITB’s).

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            #6
            I don't think that's a good idea - with high-z injectors, you will end up with really small idle PW's and possibly trouble getting the thing to idle at all.
            Build thread

            Bimmerlabs

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              #7
              I suppose you’re right, I shouldn’t bother if I’m just going to half ass it.
              Ultimately what I would like to do is run the stock injectors within the limited low RPM vacuum gradient I’ll be left with (once the ITB’s are on), & have the up stream 6 injectors take over most (but not all) of the fueling at higher RPM based on TPS. A TPS/MAP dual metering setup seems like a good idea to me. Now if only the computer I’ll need to do this wasn’t so expensive/complicated.

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