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Thread: Connecting Holley Sniper EFI to the RF Harness advice please

  1. #1
    Mark Eaton's Avatar
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    Connecting Holley Sniper EFI to the RF Harness advice please

    I have a 347 DART with Holley Sniper EFI and I could use some advise as to the best way to couple with the RF Harness. I realize this is complicated and PM's may be easier.

    Thanks,

    Mark
    MK4 #9130 , complete kit, arrived 8/10/2017, Street Legal 2/14/2020.
    DART SHP 347, EFI, TKO600, IRS
    http://thefactoryfiveforum.com/showt...n-Build-Thread

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    Senior Member FF33rod's Avatar
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    What do you have on the ignition side, the full hyperspark setup or something else?

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    RJD's Avatar
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    Here's a couple of posts that discuss wiring the Holly Sniper EFI, and having the EFI ECU control the fuel pump and cooling fan. This was on a Blueprint 302.

    https://thefactoryfiveforum.com/show...I-Wiring-Issue

    https://thefactoryfiveforum.com/show...r-Right-Answer

    https://thefactoryfiveforum.com/show...n-Sanity-Check
    Last edited by RJD; 03-03-2019 at 11:10 AM.
    MKIV complete kit w/powder coating and cut outs, serial #9189 delivered 10/10/17, first start - 10/5/18, legal - 10/08/20. Blueprint 306 w/Holley Sniper EFI, TKO 600, power steering, Breeze fan shroud, trunk cubby, & engine compartment battery kit, CNC brake reservoirs, RT turn signal & gas pedal, mechanical throttle linkage, METCO safety loop, GASN side pipes, drop trunk, dual chrome roll bars, vintage gauges, glove box, custom center console, cup holders, and speakers.

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    Papa's Avatar
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    Don't over think this and you'll be fine. If you don't have the setup instructions, here is a link to a PDF file: https://documents.holley.com/199r11031r.pdf

    First step, as noted above, what type of ignition system are you using? My install was for a standard HEI with coil on a BluePrint 347. Here is what I did:

    From the main (7-pin) harness:
    - Connect the red wire to your battery + terminal
    - Connect the black wire to your battery - terminal
    *** Don't cheat on these. Connect them directly to the battery!! ***
    - Connect the blue wire to your fuel pump + wire
    … I did this at the point in the RF harness where the rear harness mates to the dash harness. I pulled the tan fuel pump wire from the rear harness weather pack connector and then connected it to the blue EFI fuel pump control wire. If you want to retain the use of the Inertia Switch, you can simply wire in-line with the fuel pump connection I just described. Be sure to complete the ground connection that the Inertia Switch used to complete.
    - Connect the yellow wire to the coil (-) post
    - Connect the pink wire to any 10+ amp switched +12V source that has power when the key is in the on AND crank positions.

    From the 10-pin connector:
    - Connect the light blue wire to one of the two RF harness fan ground (green) wires. I used the one located at the top of the engine.
    - I de-pinned the rest of the 10-pin harness as I only used the one wire for the fan control.

    Connect the CTS plug to the provided and installed Coolant Temperature Sensor

    Connect the O2 sensor

    Connect the programming screen

    That's it for standard HEI ignition. Just three connections to the RF harness. If you are using a CDI or other ignition, the setup is specific and I have no experience with them.

    After running the Sniper's setup wizard, my car fired right up on the first try. I followed the instructions for setting the idle and all has been good since.

    Dave

    Sniper HEI Wiring - Standard HEI.JPG
    Last edited by Papa; 03-03-2019 at 12:38 PM.
    My Build Thread: http://thefactoryfiveforum.com/showt...ter-Build-9754
    (Most viewed Roadster build thread on this forum!)

    Delivered: 6/17/2017
    First Start: 12/30/2017
    Completed: 12/7/2019
    Legal: 1/30/2020

    Member of the Mile-Hi Cobra Club
    Dave's Cobra YouTube Channel: https://www.youtube.com/channel/UCbk...npK1UZHj4R-bYQ
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    Senior Member phileas_fogg's Avatar
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    One other thing: If you want the Holley system to control the timing, you have to set the computer up to do so (in addition to the physical connections, of course). If you don't, the computer won't tell the coil to fire and the car won't start. Took me a few days to figure that one out, 'cuz I'm a noob.


    John
    MK IV Roadster #8631
    Ford 302, Holley Terminator EFI, T5z, 3.55 Rear End, IRS, 17” Halibrand Replicas (9” front, 10.5” rear), Nitto 555 G2’s (275/40ZR17 front, 315/35ZR17 rear), Fast Freddie’s Power Steering, F5 Wilwood Brakes, FFMetal’s Firewall Forward, Forte’s Hydraulic Clutch & Throttle Linkage
    https://www.ffcars.com/threads/phile.../#post-4776313

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  10. #6
    Papa's Avatar
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    Quote Originally Posted by phileas_fogg View Post
    One other thing: If you want the Holley system to control the timing, you have to set the computer up to do so (in addition to the physical connections, of course). If you don't, the computer won't tell the coil to fire and the car won't start. Took me a few days to figure that one out, 'cuz I'm a noob.


    John
    True if you have a distributor that supports direct timing control by the ECU. That's why you need to know what ignition system you are using before you start. As you go through the wizard just before starting the car, you will be prompted for the parameters needed, as well as idle speed. One issue I had was I tried to set my idle too low initially and later bumped it up to 850 rpm, which my motor seems to like with the EFI.
    My Build Thread: http://thefactoryfiveforum.com/showt...ter-Build-9754
    (Most viewed Roadster build thread on this forum!)

    Delivered: 6/17/2017
    First Start: 12/30/2017
    Completed: 12/7/2019
    Legal: 1/30/2020

    Member of the Mile-Hi Cobra Club
    Dave's Cobra YouTube Channel: https://www.youtube.com/channel/UCbk...npK1UZHj4R-bYQ
    Agora 1:8 Scale Cobra Build: https://thefactoryfiveforum.com/show...l-Build-Thread

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  12. #7
    Mark Eaton's Avatar
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    Quote Originally Posted by FF33rod View Post
    What do you have on the ignition side, the full hyperspark setup or something else?
    Not sure what Hyperspark is. This is a Forte set up, I have a Pertronix Ignitor 3 Ignition (Billet Distributor) is that what you are asking?
    MK4 #9130 , complete kit, arrived 8/10/2017, Street Legal 2/14/2020.
    DART SHP 347, EFI, TKO600, IRS
    http://thefactoryfiveforum.com/showt...n-Build-Thread

  13. #8
    Senior Member FF33rod's Avatar
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    Hyperspark is a Holley CD ignition box, distributor, and coil that all works with the Sniper EFI. It takes advantage of the Sniper's ability to control timing, etc. Ends up being almost plug and play.
    The reason for asking is to understand what features you want to use out of the Sniper as there can be a lot of interaction with the ignition system which affects the wiring that you were asking about.

    Anyway, you have a lot of quality answers above...
    Cheers
    Steve

  14. #9
    Senior Member phileas_fogg's Avatar
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    Quote Originally Posted by Papa View Post
    True if you have a distributor that supports direct timing control by the ECU. That's why you need to know what ignition system you are using before you start. As you go through the wizard just before starting the car, you will be prompted for the parameters needed, as well as idle speed. One issue I had was I tried to set my idle too low initially and later bumped it up to 850 rpm, which my motor seems to like with the EFI.
    Yes; I had to raise my idle as well (to 900 RPM).


    John
    MK IV Roadster #8631
    Ford 302, Holley Terminator EFI, T5z, 3.55 Rear End, IRS, 17” Halibrand Replicas (9” front, 10.5” rear), Nitto 555 G2’s (275/40ZR17 front, 315/35ZR17 rear), Fast Freddie’s Power Steering, F5 Wilwood Brakes, FFMetal’s Firewall Forward, Forte’s Hydraulic Clutch & Throttle Linkage
    https://www.ffcars.com/threads/phile.../#post-4776313

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