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Regular injectors as secondaries on top of DI?

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  • Regular injectors as secondaries on top of DI?

    I'm wondering if it's possible yet on the Dominator with the right module to run one set of direct injectors with a secondary set of port injectors, or vice versa? kinda like what Ford does on the Gen 3/4 Coyotes and the Gen 2 3.5L EcoBoost? My dad wants to do an LT build, but he wants to make more than any DI injectors I can find will support (twins), and he wants to keep the DI there for knock resistance (which I agree with). Any advice or thoughts?

  • #2
    Unfortunately, as of now, there is no DI support on the Dominator ECU, only the Terminator X. However, when support is available with the Dominator and the DI interface box, then it would definitely be possible to use the DI injectors as the primary and then have secondary injector in the intake runners. GM did this with the LT5 engines. Andrew
    Instagram: @projectgattago
    Offering remote Holley EFI tuning.
    I deliver what EFI promises.
    Please get in touch if I can be of service.

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    • #3
      Oh, I figured since they go through a different module for the Terminator stuff that you could just hook that box to a Dominator, but I guess not.

      Can't wait till the Dominator supports DI, gonna open up a whole new world of combinations.

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      • #4
        The DI firmware has not been incorporated into the Dominator/HP firmware, yet. Andrew
        Instagram: @projectgattago
        Offering remote Holley EFI tuning.
        I deliver what EFI promises.
        Please get in touch if I can be of service.

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        • #5
          Didn't the 2012-2016 COPO have the HP and a proprietary DI driver box? I've read about it, seen photos of it. However, no Holley part number, maybe GM has a service part number? It's peculiar that V4 through V6 EFI software does allow you to select DI. Maybe GM got proprietary firmware for the COPO? Try talking to GMPP or a COPO specialist maybe? Sucks their flagship ECU doesn't have direct injection capabilities.

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          • #6
            I'm not aware of such a DI driver box existing, but that doesn't mean it doesn't. Also, every COPO car that I've seen in person had a Gen 4 engine. Andrew
            Instagram: @projectgattago
            Offering remote Holley EFI tuning.
            I deliver what EFI promises.
            Please get in touch if I can be of service.

            Comment


            • #7
              Yeah, odd they make the GDI Controller that comes with the Gen V LT Terminator X kits (550-1600 & 550-1601)? You would think that since the Terminator X ECU can interface with that for GDI control, it (the Terminator X ECU) must have some hardware/firmware in it that the HP/Dominator doesn't have (yet?). My guess is they plan to make it work with HP/Dominator when they release support for the LT4 engines, possibly HEFI V7? Just thinking aloud.

              I think I've seen some C8 Corvette twin-turbo videos (LT2) where they're using Holley EFI (not sure which ECU) to control another add-on set of (port) fuel injectors to handle the extra fuel requirements under boost. Similar to how the 2019 ZR1 (LT5) has the secondary set of port fuel injectors on board like Andrew mentioned.
              sigpic
              HP EFI V4, 388cid Stealth Ram, 1000 CFM 58mm throttle body, Holley Dual Sync Distributor. LS Coil Near Plug, 1 bar MAP, 48 lb/hr Holley EFI injectors, 43 psi

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              • #8
                Originally posted by andrewb70 View Post
                I'm not aware of such a DI driver box existing, but that doesn't mean it doesn't. Also, every COPO car that I've seen in person had a Gen 4 engine. Andrew
                https://www.motortrend.com/features/...es-drag-racing
                Dated 2017 I remember reading it about 4 years ago. all of this predates the terminator x release. They definately had some sort of "di interface" according to the article.
                Last edited by Bill C; 09-12-2022, 02:29 AM. Reason: Added Link

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                • #9
                  https://www.motortrend.com/features/...9-b76510ba952f
                  There it is, why they never made it available retail is beyond me? I can imagine GM making it available only if you have a COPO car. They even give a Holley part number of 550-150, and state it requires a EFI software update to V4. I emailed Holley tech support a couple years ago and never got a response back.
                  These are the part numbers for the Holley/Hooker/MSD family brands used by Lawrence on the 2017 COPO LT Camaro test-car.
                  Description Part No.
                  Holley Direct Injection control unit (add-on box) 550-150
                  Holley HP ECU 554-113
                  Holley Hi-Ram intake manifold, COPO-branded GM 19351771*
                  Holley VR1 brushless screw-style fuel pump 12-155
                  Holley VR-series fuel pressure regulator 12-851
                  First Direct-Injection COPO Camaro Goes Drag Racing
                  To add DI support to its existing ECU, Holley supplies an auxiliary box that controls the DI nozzles and high-pressure DI pump. When a current 6.2L DI owner opens the Holley EFI software, he'll see the same fuel & spark tables as on a port-injected COPO. If you have "last year's" Holley setup, the add-on box plus an software update to Version 4 is all you need to support DI. (Photo: Holley Performance)
                  Click image for larger version  Name:	03-Holley-add-on-DI-control-unit-and-harness-PN-550-150.jpg Views:	0 Size:	60.6 KB ID:	364831

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