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Thread: SBEC injector drivers

  1. #1
    Supporting Member II Turbo Mopar Contributor
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    SBEC injector drivers

    Which of the following would best describe the factory injector drivers:
    A) 2 amp Peak, 0.5 amp Hold, 43V Zener Voltage Suppression, 14.0 VDC

    B) 4 amp Peak, 1 amp Hold, 4 ms timer, 33V Zener Voltage Suppression, 14.0 VDC

    C) Neither

  2. #2
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    Re: SBEC injector drivers

    Hi Dan,
    I can have a look tonight to see if I can cross-reference.
    My guess is C as the injectors are approx 2 ohm and thus 14/2 = 7 amp albeit for a short period of time
    Regards,
    Miles

    DD '87 Sundance T1, 12PSI, SLH with rear disks
    '87 CSX #432

  3. #3
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    Re: SBEC injector drivers

    Hi Dan,
    I checked a SBEC2 that I have hacked and three that I could read have a PH4947 but I could not find any info on them. Perhaps a special Cryco part number and one also had a Chrysler part number of 4392616.
    Maybe I can test in circuit. I would guess they are N-channel Mosfets
    Last edited by chromguy; 07-28-2019 at 11:43 PM.
    Regards,
    Miles

    DD '87 Sundance T1, 12PSI, SLH with rear disks
    '87 CSX #432

  4. #4
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    Re: SBEC injector drivers

    Thanks for checking Miles.

    I'm asking because I received battery offset data for an injector. It has different scales for type A or B

  5. #5
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    Re: SBEC injector drivers

    Quote Originally Posted by Dan H View Post
    I'm asking because I received battery offset data for an injector. It has different scales for type A or B
    Low vs high impedance???? I have no idea what is type A or B.. google search was of no help either
    Regards,
    Miles

    DD '87 Sundance T1, 12PSI, SLH with rear disks
    '87 CSX #432

  6. #6
    Supporting Member II Turbo Mopar Contributor
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    Re: SBEC injector drivers

    They are low impedance injectors.
    A or B was only a reference to my two initial descriptions in the first post. Those were the driver types for the two separate specs they provided.

  7. #7
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    Re: SBEC injector drivers

    Dan,
    i test a few SBEC and SBEC2 drivers in circuit with my transistor tester but no luck. I guess I need to unsolder them to fully characterize.
    Regards,
    Miles

    DD '87 Sundance T1, 12PSI, SLH with rear disks
    '87 CSX #432

  8. #8
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    Re: SBEC injector drivers

    Thanks Miles

  9. #9
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    Re: SBEC injector drivers

    Dan,
    Last night I checked the MOSFET requirement for speeduino that only works as is for high impedance injectors, they use a STP25N504Z that is rated for 80A ....They don't recommend you use low impedance injectors unless you use series resistors to drop the current..
    Regards,
    Miles

    DD '87 Sundance T1, 12PSI, SLH with rear disks
    '87 CSX #432

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