Holley Sniper Installation Any Tips?

[Bobby Doug]

I am getting ready to install the unit on my car. Looking for any dos and don’ts pertaining to the installation.
Thanks,
Doug

[weendoggy]

1. Ignition type? Timing controlled? If so, you need a Dual Sync or Hyper Spark setup.
2. Need to run a fuel return line if you have/had a carburetor.
3. Install a fuel pressure transducer so you can monitor the pressure on the 3.5 screen.
4. Get a 4-pin "Y" harness connector so you can have the LCD and laptop connected at the same time.
5. Get a terminal pin tool to remove unneeded circuits and extra terminals to shorten harness if needed.

[Greg K]

Bobby,

Why not talk to Prestige, they do these everyday and know your motor.

[D Stand]

It depends on your intention. If just replacing carb then all you will need Is:
*a higher pressure fuel pump and return. They highly recommend in tank pumps.
*make provisions for O2 sensor.
*make provisions for added coolant temp sensor.

If you want to utilize more functions you will be getting into new distributor, coils, CD boxes, digital gauges,.....

[D Stand]

Bobby,

Added a few details that might help you out. The picture is of what I did for the coolant sensor from your question in PM (still can’t figure out to attach picture in PM). The drawing spells out more what is going on with the sniper wiring and the changes I have made. The wiring details from Holley are not very clear and since I am an electrician, I took it apart and detailed it better.

Hope it helps you out,
Dale

[Bobby Doug]

Bobby,

Added a few details that might help you out. The picture is of what I did for the coolant sensor from your question in PM (still can’t figure out to attach picture in PM). The drawing spells out more what is going on with the sniper wiring and the changes I have made. The wiring details from Holley are not very clear and since I am an electrician, I took it apart and detailed it better.

Hope it helps you out,
Dale

Dale,
Thanks, I did send you a PM response and I’ll look at drilling and tapping my heater hose connection.
Thanks
Doug

[Bobby Doug]

For those of you thinking about doing an install of the Holley Sniper I will do a detailed post regarding my experience with it. My install is still in progress.
Doug

[erstanl]

For those of you thinking about doing an install of the Holley Sniper I will do a detailed post regarding my experience with it. My install is still in progress.
Doug

Bobby, I am currently doing mine as well. I'd love to see what you are putting together!

[BradCraig]

Yep. Below is a list I put together for folks having issues over in the Sniper FB forum. Not Cobra specific, this is lessons learned on my Camaro.

Here's the deal...The biggest complaint I have about the Sniper (or any of them) is they market as plug-n-play and 100% self-learning! They aren't!
Few points:

• Your current setup better be rock solid meaning if your engine is tired and running like ****, Sniper will not fix that. Exhaust leaks? Better fix those first, a very small leak will drive the O2 sensor nuts. If your electrical system is a rat’s nest? Forget it. Basically, any current issue you have will be magnified by any EFI system.

• Gas Tank: You can use your current tank with external pump and run a return line or use one of the return-less options. I chose the Tanks, inc EFI tank with in-tank pump because its honestly the best way to do it. New baffled tank to help prevent sloshing and loss of fuel pressure, quieter pump, longer pump life, and the constant recirculation keeps the fuel charge cooler. If you use your tank, pull it and flush the crap out of it. Note that Sniper recommends\requires a minimum of 3/8 supply line. They also recommend 3/8 return, but I used the existing 5/16 as my return without issue as do many.

• O2 sensor\Exhaust: As stated, NO EXHAUST LEAKS AHEAD OF THE SENSOR! Do not use the provided clamp in the kit, weld the bung in and pay attention to the angle

• Electrical: +/- must be run directly to the battery no exceptions. Another 12v hot during cranking\running must also be provided, this must be a clean circuit! Holley does not say it, but best thing to do is to run this feed to the battery + with a relay and trigger it via the 12v hot. Good connections a must here.

• RFI: this is the largest thing that nails people and causes the Sniper to have major issues. Keep your sniper wiring away from the coil, alternator wires, spark plug wires, etc. You’ll also find you will more than likely have to replace your existing spark plug wires with the recommended Holley wires that offer more RFI suppression. Some folks also find that their magnetic pickup disti causes RFI. That was not my experience however I went to the HyperSpark will hall effect to eliminate the possibility and to be able to control timing with Sniper (this is where it gets fun)

• Skills: This is a whole new skillset. You can set up via the provided handheld, but if you really want to tune it via Laptop so if you know your way around a laptop you are a step ahead. Read up on EFI basics and how it works. I see carb folks trying to make parallels to carbs and they get frustrated quickly. As a few folks stated, there is a FB group with a LOT of resources to help tune, many for free.

• Read the full manual….three times. The quickstart guide is ****, download the full install manual from Holley.

• Do not order your kit from Summit, Jegs, Holley, etc. Several smaller shops will provide unbelievable support through the ordering and install process. Trust me on this.

• Have fun!!!! When you get it working right it’s a whole new car and you’ve taught yourself a new skill!


Good Luck!

[js65cobra]

3. Install a fuel pressure transducer so you can monitor the pressure on the 3.5 screen.


Sorry to jump in here, but I saw this, and my brain was intrigued. I have a holley sniper stealth 4150 system on my FFR Mk1, that I installed last month. Do you have details on how you would hook this up into the handheld? I can't seem to find anything online.. thanks!

[FF33rod]

I heartily recommend these guys https://www.efisystempro.com/
I bought some sniper accessories from them, wish I had discovered them before I bought the unit. Very knowledgable and super helpful

Steve