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Thread: MSD Digital 6 & Sniper 4500

  1. #1

    Default MSD Digital 6 & Sniper 4500

    Hello. New to EFI and just got a Sniper 4500. Can I use my MSD 85551 distributor and MSD Digital 6 box together with the 4500? Thanks.

  2. #2


    In short answer, yes. But are you wanting to control the timing with the Sniper? The Sniper instructions are fairly straight forward for the Digital 6 box. Any more questions, please feel free to ask.

  3. #3
    Join Date
    Dec 2009


    In my opinion, if a Holley EFI user isn't familiar with the Magnetic Ignition Type "Minimum Signal Voltage" &
    "Filtering" parameters (in System Parameters/Custom Ignition Parameters), then they have no business using
    VR/magnetic pickup type crank & cam sensors. This is the problem with using magnetic pickup type sensors,
    there's more tuning work/adjustment involved. Hall-Effect sensors are "set & forget", very easy to use.

    The more robust Hall-Effect sensors are preferred because they're not susceptible to EMI/RFI interference/noise,
    and their digital square-wave signal strength is consistent, regardless of RPM (unlike the VR magnetic sine-wave).
    Also, the VR magnetic pickup signal is weaker at cranking speeds.

    Another problem with using VR Magnetic sensors, is there's more tuning work. Hall-Effect is "set & forget".
    The VR Magnetic Sensor Type "Filtering" & "Minimum Signal Voltage" parameters need to be programmed. (Magnetic Crank/Cam Input Filtering Parameters, Page 2) (Example: Wrong Magnetic Parameters, Post #25)

    Hall-Effect: 3-wire, square wave signal (digital), pulse generation
    VR Magnetic: 2-wire, sine wave signal (inductive), voltage generation (Hall-Effect vs VR Magnetic)
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS TW 11R 205 heads, 11.8:1 comp, TFS R-Series intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 160A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/3000 RPM converter, FPP aluminum driveshaft, FPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & MT 245/45R17 tires.

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