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Thread: replacing injector drivers in SBEC/2

  1. #1
    Supporting Member Turbo Mopar Contributor
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    replacing injector drivers in SBEC/2

    Have you replaced injector drivers in your SBEC or SBEC2?
    I developed an easy procedure to get them off the board that I will write up shortly.
    First does any one know what to replace these with.
    They appear to be a 5 pin TO-220-5 MOSFET of some sort. Is something for peak and hold?
    The V6 uses a standard TO-220-3, the 3 pin N-channel MOSFET. I was able to identify this with my "transistor tester" with a Vgs of 1.4V
    Last edited by chromguy; 12-06-2019 at 01:07 AM.
    Regards,
    Miles

    DD '87 Sundance T1, SLH with rear disks
    '87 CSX #432 2.5 CB TII, SLH

  2. #2
    turbo addict
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    Re: replacing injector drivers in SBEC/2

    I have wondered this for a while. I mean, I know you can get injectors in both types, but I think I remember there is an advantage to the type we *don't* run. The question is, can the other hardware on the board support it?

  3. #3
    Supporting Member Turbo Mopar Contributor
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    Re: replacing injector drivers in SBEC/2

    Quote Originally Posted by Reaper1 View Post
    I have wondered this for a while. I mean, I know you can get injectors in both types, but I think I remember there is an advantage to the type we *don't* run. The question is, can the other hardware on the board support it?
    Yes the board can support both, look like it is the driver chip (a TO-220 package) and 62 ohm resistor. I hope to verify this over the next month or so
    We use the peak and hold for the low impedance injectors.
    Regards,
    Miles

    DD '87 Sundance T1, SLH with rear disks
    '87 CSX #432 2.5 CB TII, SLH

  4. #4
    Supporting Member Turbo Mopar Contributor
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    Re: replacing injector drivers in SBEC/2

    The 5 pin TO-220-5 injector driver chip is MC3484V4.
    Regards,
    Miles

    DD '87 Sundance T1, SLH with rear disks
    '87 CSX #432 2.5 CB TII, SLH

  5. #5
    Garrett booster Turbo Mopar Contributor
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    Re: replacing injector drivers in SBEC/2

    Quote Originally Posted by chromguy View Post
    The 5 pin TO-220-5 injector driver chip is MC3484V4.
    Miles, I found this thread in a search. I just wanted to verify this is the part number you located for the SBEC injector driver?
    I have a new SBEC board that has an injector circuit fault. I'm having trouble tracking down the picture of the stripped board.

    Dan

  6. #6
    Supporting Member Turbo Mopar Contributor
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    Re: replacing injector drivers in SBEC/2

    Quote Originally Posted by Dan H View Post
    Miles, I found this thread in a search. I just wanted to verify this is the part number you located for the SBEC injector driver?
    I have a new SBEC board that has an injector circuit fault. I'm having trouble tracking down the picture of the stripped board.

    Dan
    The part number is correct. I will send the documentation by email
    Regards,
    Miles

    DD '87 Sundance T1, SLH with rear disks
    '87 CSX #432 2.5 CB TII, SLH

  7. #7
    Garrett booster Turbo Mopar Contributor
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    Re: replacing injector drivers in SBEC/2

    Thank you!

  8. #8
    Moderator Turbo Mopar Staff Force Fed Mopar's Avatar
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    Re: replacing injector drivers in SBEC/2

    Working on replacing drivers on my TIII SBEC1 ecu, figured I'd drop the photos here for posterity's sake, since this sort of thing disappears on FB pretty fast.

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    Rob M.
    '89 Turbo GTC

    2.5 TIII stroker, 568 w/ OBX and 3.77 FD

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    Re: replacing injector drivers in SBEC/2

    Hey Rob,
    Thanks keep us in the loop. Were did you find the driver chips? Last time I checked they were going for around $30 each. A few years back Dan H found a few cheap on ebay.
    PS watch out for MC3484 as they also came as a 1 Amp option rather than the desired 4 amp.
    Regards,
    Miles

    DD '87 Sundance T1, SLH with rear disks
    '87 CSX #432 2.5 CB TII, SLH

  10. #10
    Moderator Turbo Mopar Staff Force Fed Mopar's Avatar
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    Re: replacing injector drivers in SBEC/2

    Quote Originally Posted by chromguy View Post
    Hey Rob,
    Thanks keep us in the loop. Were did you find the driver chips? Last time I checked they were going for around $30 each. A few years back Dan H found a few cheap on ebay.
    PS watch out for MC3484 as they also came as a 1 Amp option rather than the desired 4 amp.
    Here's link to them

    https://store.americanmicrosemicondu...9ICNtf6HDxPPJs
    Rob M.
    '89 Turbo GTC

    2.5 TIII stroker, 568 w/ OBX and 3.77 FD

  11. #11
    Supporting Member Turbo Mopar Contributor
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    Re: replacing injector drivers in SBEC/2

    Quote Originally Posted by Force Fed Mopar View Post
    Does the ECU now work?
    Regards,
    Miles

    DD '87 Sundance T1, SLH with rear disks
    '87 CSX #432 2.5 CB TII, SLH

  12. #12
    Moderator Turbo Mopar Staff Force Fed Mopar's Avatar
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    Re: replacing injector drivers in SBEC/2

    I haven't ordered them yet. I actually ended up deciding to go standalone on the car, so may or may not finish fixing the stock one.
    Rob M.
    '89 Turbo GTC

    2.5 TIII stroker, 568 w/ OBX and 3.77 FD

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