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Thread: Holley HP EFI vs J&S Vampire

  1. #1

    Default Holley HP EFI vs J&S Vampire

    Hello Holley forums. I've just purchased a new edge Saleen and the builder installed a Holley HP EFI system with the Digital Dash. From previous builds I've used the J&S Vampire system to detect knock and retard timing. It will detect it on a per cylinder basis and retard timing to that cylinder, then advance it again until it starts knocking, then retard it just below that level. It's a really cool system.

    I have a spare Vampire unit and I think it could be installed to piggy back on the Holley EFI system, but I'm not fully sure what the HP EFI system is capable of. Can a knock sensor be added and can it be programed to retard, then advance the timing per cylinder like the Vampire? Thanks!

  2. #2
    Join Date
    Dec 2009
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    Default

    Is the J&S Vampire Knock Detection system a stand-alone unit?
    http://forums.holley.com/showthread....ors-Holley-EFI (Connecting & Tuning Knock Sensors)
    http://forums.holley.com/showthread....2066#post62066 (Additional Knock Sensor Tuning Info)
    https://forums.holley.com/showthread...0606#post40606 (Related Forum Post)
    May God's grace bless you in the Lord Jesus Christ.
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  3. #3

    Default

    I'll dive into those links after work today, but yes the Vampire is a stand-alone system that works with dumb COP and is usually piggy backed on the factory COP wires in a Mustang at the ECU plug. I believe I could get the proper plugs and install the Vampire between HP and the Coil Drivers. http://www.jandssafeguard.com/VampirePage/Vampire.html. Thank you for your assistance!

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