Wiring the Holley Sniper EFI

Until recently, electronic fuel injection was completely out of the hands of your typical automotive enthusiast.  Over the past years, many different companies have introduced powerful and elegant systems to bring the benefits of EFI to anyone.  Holley recently introduced their Sniper EFI system.  This is a cost-effective EFI system that can handle up to 650 horsepower and can be tuned without a laptop.  Wiring the Holley Sniper EFI system is a breeze with our Infinitybox 10-Circuit or 20-Circuit Kits.  This blog post will take you through the details.

Our Infinitybox system can interface with any electronic fuel injection system in the market.  Wiring the Holley Sniper EFI is as simple as wiring their Terminator or their Dominator.  Click on this link to get to the details of wiring the Holley TerminatorClick on this link to get to the details of wiring the Holley Dominator.

Before you start wiring the Holley Sniper EFI, you must thoroughly read and understand the instructions that came with your kit.  This link will take you to the Holley manual.  Note that this blog post is just going to cover wiring ignition power from your Infinitybox system and wiring the fuel pump & cooling fan.  The Holley manual will cover the rest of the wiring details.

This diagram shows you the connections between your Holley Sniper EFI and your Infinitybox system.

Wiring diagram showing how to wire the Holley Sniper EFI system to the Infinitybox 20-Circuit Kit.

First things first, you need to get battery power and ground to the Sniper.  The red wire in their 7-pin connector must go directly to the positive terminal on your battery.  The black wire in their 7-pin connector must go to ground.  As we discussed in other blog posts, 90% of all electrical problems relate to a bad ground.  Make sure that you have a solid metal-to-metal connection to your chassis with no paint, grease, powder coating or dirt in the way.

Next, you need to bring ignition power from your POWERCELL to the pink wire on their 7-pin harness.  In most Infinitybox systems, this is the light-green wire on your front POWERCELL but check your configuration to be sure.  This POWERCELL output will supply battery power to the Sniper whenever you have the ignition switch on.

Next, you need to connect your MASTERCELL input for your cooling fan to the light-blue wire on the Sniper 10-pin harness.  You must install a diode in series between the MASTERCELL input and the cooling fan trigger on the Holley harness.  We recommend a 1N4001 diode.  Note that the orientation of this diode is critical.  Check the diagram above for the correct orientation of the stripe on the diode.

There are several advantages to using the Infinitybox system to control the cooling fan directly off of the Sniper harness.  First, you do not need to add a relay.  That is built into the POWERCELL.  Second, our cooling fan outputs are set to soft-start the motor.  Click here to learn more about the benefits of soft-starting.

Next, it is time to wire the fuel pump.  The dark-blue wire on the 7-pin connector is the fuel pump trigger.  This is a 12-volt signal so it cannot be directly connected to the MASTERCELL input for the fuel pump.  You must use an inVERT Mini to flip this 12-volt signal to a ground signal for the MASTERCELL.  This link will get you more details on the inVERT Mini.  The diagram above will show you how to wire the inVERT Mini between the Sniper EFI harness and your MASTERCELL input.

There are several advantages of using the Infinitybox system to control the fuel pump directly from the Sniper harness.  First, we can disable the fuel pump as a security measure if you have our inLINK Radio upgrade.  More importantly, having the Infinitybox system control the fuel pump means that you  have to run less wire in the car.  The MASTERCELL is located close to the EFI system.  The rear POWERCELL is mounted near the fuel pump in the tank.  There is no extra fuel pump wiring required to make it work.

One quick note about the Sniper if you are using our One-Button Start feature.  It takes their system 2.5-seconds to boot up.  It is only after that time that the fuel-pump will start to prime.  Our standard One-Button Start feature is set for a 1-second fuel pump prime.  We can easily extend our fuel pump prime time to accommodate the timing required for the Sniper EFI system.  Please talk to Infinitybox technical support when you place your order to make this change.

Wiring the Holley Sniper EFI system with your Infinitybox 20-Circuit Kit will get you all of the functionality that you need to control your engine.  You can download a PDF of our wiring diagram by clicking this link.

Click this link to contact our team with any questions about how our Infinitybox system can streamline your wiring projects.