Holley Sniper EFI 4150 Dual Quads

10 min read

Holley Sniper EFI 4150 Dual Quads

10 min read

Nothing says "muscle" on an engine like dual quads. Since way back in the 1950s, the Big Three have been stuffing dual quads on factory hot rods. They’ve always oozed the essence of performance, yet were a bit tricky to tune. Introducing Sniper EFIs 2x4 line of EFI systems for dual carbureted engines. Whether you have a big blown supercharged engine or a naturally aspirated one, the Sniper EFI 2x4 throttle bodies will give you all the benefits of EFI with easier starting, tuning AND drivability! And we didn't leave any of the performance out of it. With Sniper EFI’s proven self tuning capabilities, you can expect a great driving experience.

The Sniper EFI 2x4 system's rear-mounted throttle body handles all of the engine's sensors and inputs/outputs, while the front-mounted throttle body is fitted with injectors only.

Sniper EFI 2x4 in front of Thumper

Two versions of Sniper EFI Dual Quad are available combinations, Sniper EFI 2x4 is available for naturally-aspirated engines. Super Sniper EFI 2x4 is designed for draw through forced-induction applications. Both Sniper EFI 2x4 systems can support up to 1250 HP from the eight 100 lb/hr injectors.

With the USB to CAN tuning cable, included with the Super Sniper EFI 2x4, you can download Sniper software to give you the same advanced fuel, ignition timing, and nitrous control features found on Holley HP and Dominator EFI systems.

Sniper hand held

Using the handheld touchscreen monitor you can even program and set target air fuel ratios per boost level! A 2.5 bar MAP sensor tells Super Sniper 2x4 how much boost you are making and monitors up to 21.5 pounds of boost pressure.

For nitrous racers, it supports wet or dry nitrous applications. It also features a built-in single stage progressive nitrous controller that allows you to set up a lean/rich AFR cutoff point for your Sniper and Super Sniper Dual Quad. Timing retard can be RPM or time-based, all controlled from the handheld touchscreen controller.

The built-in single stage progressive nitrous controller must be set up through the Sniper software at first, but then can be adjusted through the handheld touchscreen display. You can setup a lean/rich AFR cutoff point for your Super sniper. Timing retard can be rpm or timed based all adjusted from the handheld touchscreen display.

Sniper EFI 4150 2x4

Like the original Sniper EFI, the Sniper 2x4 and Super Sniper 2x4 versions have five ground-triggered outputs for controlling accessories. Super Sniper EFI 2x4 has additional outputs, along with three 0-5 volt inputs that allow you to monitor additional sensors, such as fuel, oil or pressure sensors.

Installation and setup is similar and just as easy as the original Sniper EFI. You get the tried and true self-tuning ECU, which creates the basic calibration to get you running after you answer a few basic questions on the touch screen display.

Just like the original Sniper EFI, you can keep your ride old school with Holley EFI analog-style digital gauges or you can deck it out with all the killer Holley EFI digital dashes available.

Holley EFI Digital Dash 6.86

The throttle bodies use the same 4150-style dual pattern mounting flange, so making the switch from dual carburetors to Sniper EFI Dual Quad is easy. By using OEM-style TPS and IAC sensors you’ll get years of dependable service. The Bosch wideband oxygen sensor provides real time fuel map learning, keeping your engine happy for more driving enjoyment even with changes in altitude and climate.

Both Sniper EFI Dual Quad and Super Sniper EFI Dual quad are able to control timing when used with a magnetic pickup distributor such as an MSD Pro Billet or a hall effect distributor like Holley’s Dual Sync. By controlling the timing you can set the rev-limiting capabilities on the touch screen display. Sniper EFI 2x4 is compatible with CD ignitions such as MSD's 6 series, or you can use a standalone coil by installing the Holley Coil Driver, part number 556-150, which is not included. 

Get that look and drivability you’ve been looking for in your classic dual carbureted hot rod with Sniper EFI 2x4!

Sniper EFI 5-Inch Digital Dash

Do you find the 3.5-inch touchscreen a little bit small for monitoring your Sniper system? Then the Sniper EFI 5-inch touchscreen digital dash might be the unit for you. Featuring the the same touchscreen tuning abilities as the 3.5-inch unit plus the ability to run a full gauge cluster means that you can have your cake and eat it, too. Click the image to learn more!

HyperSpark Ignition for Sniper

With HyperSpark ignition, you are four wires away from fuel injection with timing control! Maximize the benefits of your conversion to EFI by adding timing control to the program. Using a HyperSpark distributor, coil, and CDI ignition box, you'll be able to pinpoint the timing of your engine...or simply let the Sniper handle it for you. Click the image to learn more!

EFI-Ready Fuel Tanks

Intrigued about making the jump to EFI? Then you are probably thinking about what to do about a fuel tank. Holley has plenty of options that will help your decision, from drop-in style fuel modules that will take the place of your stock module, to EFI-ready fuel tanks that will replace your stock tank. Click on the image to learn more!


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