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Thread: Sniper Wiring Question

  1. #1
    Join Date
    Mar 2018
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    Northern California
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    Default Sniper Wiring Question

    I have a basic ignition setup with an MSD coil & MSD distributor, NOT controlled by the EFI. There is no separate CD box.

    The Sniper wiring diagram shows the yellow wire powering the coil, and the brown wire powering the cars tachometer. The diagram shows (page 22) nothing going to the violet wire. The MSD distributor has a purple wire labeled “tach out” which is currently powering the tach (and the tach input for the EFI unit I'm removing). Should I leave the current tach hookup alone or change it to the brown wire from the Sniper? If I change it, wouldn’t I need to also connect the violet & purple wires? Thanks.

  2. #2

    Default

    Change it to brown. The tach out of the distributor is an RPM input for the Sniper to let the ECU know engine speed so it knows what fuel to add. The brown out of the Sniper is a tach signal to run the tach.

  3. #3
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    Mar 2018
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    Default

    Cool, makes sense. So if the Sniper knows the engine speed, will the rev limiter work by cutting the fuel, if I put in something below the programed 20,000 RPM? Note I'm not using the ignition control feature at this time.

    Wait, I'm not sure what I should do with the purple tach out wire from the distributor? Are you saying to only hook up the purple wires and not use the yellow on the coil?

  4. #4
    Join Date
    Dec 2009
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    Default

    Quote Originally Posted by B767 View Post
    So if the Sniper knows the engine speed, will the rev limiter work by cutting the fuel, if I put in something below the programed 20,000 RPM? Note I'm not using the ignition control feature at this time.
    No, the Sniper EFI requires ECU controlled ignition timing for the Rev Limiter functions.
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

  5. #5
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    Default

    OK, thanks. Still not sure about the yellow & purple (violet) wires. Do I connect them both, or just one or the other? The current EFI uses them both.

  6. #6
    Join Date
    Dec 2009
    Location
    Connecticut
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    Default

    Quote Originally Posted by B767 View Post
    Still not sure about the yellow & purple (violet) wires. Do I connect them both, or just one or the other?
    You're only using the yellow wire. Please follow the no timing control wiring diagram for use without a CDI box, on page 22: http://documents.holley.com/199r11031r.pdf (Holley Sniper EFI Instruction Manual)
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

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