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Thread: Sniper EFI 550-511

  1. #1

    Default Sniper EFI 550-511

    Can someone please confirm for me that Sniper EFI 550-511 will handle a low boost application? If so, do I need to upgrade the EFI software and will the internal fuel regulator handle low boost?

  2. #2
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    Even though the Sniper EFI already has a 2 bar MAP sensor, you'll want to adjust the Base Fuel & Timing Table's MAP kPa scale (LINK) and tune the table for boost. The Config File is not ready for forced induction "straight out of the box". The Sniper EFI software must be programmed for boost (Boost Setup, Base Fuel & Base Timing tables, etc.). By default, it's programed for naturally aspirated engines.
    http://documents.holley.com/techlibrary_199r11259.pdf (Holley Sniper EFI Software Help File)
    https://www.holley.com/support/resou...Fuel_Injection (Holley Sniper EFI Software Download)

    Originally Posted by Danny Cabral
    The Target Air/Fuel Ratio Table & Base Fuel/Timing Table (and MAP kPa & RPM axes/scales) should be configured using the Sniper EFI software: In the Sniper EFI software (LINK), Target Air/Fuel Ratio Table (Fuel ICF) & Base Timing Table (Spark ICF), select "2D Table" Type (not "Simple"). The Target Air/Fuel Ratio Table & Base Timing Table can then be properly configured & tuned for any engine. I always suggest taking notes of your current distributor's ignition timing specs/curves beforehand, and then program the Base Timing Table accordingly.
    https://www.holley.com/support/resou...Fuel_Injection (Sniper EFI Software & Holley 558-443 CAN/USB Dongle)
    https://forums.holley.com/showthread...679#post100679 (Sniper EFI Optional Comm/Data Cable Accessories)

  3. #3

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    Thanks Danny for the reply.
    Only new at this. So download through a laptop onto my SD card, and then download onto Wizard and use default settings. Thanks, Dave

  4. #4
    Join Date
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    Depending on how much boost and the manner you want to do it (blow-through or draw-through) will dictate the modifications you'll need to do to the base Sniper.

  5. #5

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    Okay, thanks for the reply.

  6. #6
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    Quote Originally Posted by Dave XC View Post
    Thanks Danny for the reply.
    Only new at this. So download through a laptop onto my SD card, and then download onto Wizard and use default settings. Thanks, Dave
    You can use the Sniper EFI PC software to download the base calibration and use it to create your Global Configuration File (GCF). With the Sniper EFI software, you don't need the Wizard at all.
    http://documents.holley.com/techlibr...10555rev17.pdf (Holley EFI Wiring Manual & Diagrams)
    http://forums.holley.com/showthread....ents-Read-This (Initial Checks & Adjustments - Read Step #1)

  7. #7

    Default

    The instruction manual for that part number says "no superchargers or turbochargers" in the engine requirements on p. 5. You can take that for what it is worth and that does not mean others haven't done it. It just depends on what your style is. If you like to tinker and make things do what they're not designed to do, then go for it. If you're a by-the-book guy then you need the Super Sniper for boosted applications.

  8. #8

    Default

    Okay, thanks very much for your help.

    I emailed Holley directly and the Tech said it can handle 16 psi of boost. Mine is a blow-through setup. I'll be running low boost around 6 to 8 psi. But I did a return email asking if it was good to go out of the box with low boost haven't heard back as yet. Thanks for your help.

    So I have Sniper not a Super Sniper. Can't I just download Super Sniper EFI software onto my Sniper for low boost?

  9. #9
    Join Date
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    Everything you need to know is in post #2.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS T/W 11R 205 heads, 232°-244° duration/.623" lift/114° LSA camshaft, 12:1 C/R, TFS R-Series FTI ported intake, BBK 80mm T/B, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 200A 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, -6AN fuel system plumbing, Walbro 255 LPH pump, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/3000 RPM converter, B&M Hammer shifter, 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 & 245/45R17 M/T Street Comp tires.

  10. #10

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    Okay, thanks Danny. I'll give it a go. If I get stuck, is it okay to contact you? Thanks, Dave

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