hello
who has this system on his corvette? it works well?
​​​​​​https://www.holley.com/products/fuel.../parts/550-868

 

There are a lot of members with the Sniper system. You should be able to find lots of threads regarding the subject using the forum search. I installed this on my 69 a few years back, good system. T

 

I had a Sniper installed on my 1968 300/327. Once we finally got the tuning correctly set-up the system works great. Another problem was the alternator would only put out around 12.6V at idle and Sniper does not like that. Installed a new alternator and that solved most of my problems. Still not enough output at idle when the AC is on.

 

I'm curious to know how people are routing the wiring such as the battery +/-.

 

I have a distribution block with under the hood that is direct line to the battery. My power feeds from that. I already had a MSD distributor, so mine now controls the timing as well.

I replaced an old PowerJectionIII with the Sniper a little over a year ago and I couldn't be happier. Word of caution....When they say to make sure you do a good job with the wiring, they mean it. Weak connections, bad ground, ignition interference will mess up the performance substantially. Clean, neat and proper wiring and connections are mandatory

 

I have it installed on my 76 with a RobbMC power surge to get fuel pressure up. I have not driven it yet because I'm doing other work to the car. I will say my car cranks up real nice with the Sniper; I can't wait to drive it.

 

Curious as to what kind of MPG increase the sniper will provide? I really like the idea of EFI (and not having to learn about setting up a carb) and have found a really good deal on the budget sniper kit in the UK. Also would a 105amp alternator be enough for the EFI with an MSD 6al and electric fans?

 

If your carb is in good nick don't expect much mileage increase. Also a 105 amp alt should be sufficient. T

 

I did a lot of research on whether to run a Sniper EFI for my 496 or run a carb.
Everything I found was positive and I was leaning towards the Sniper over a carb.
Once I added up the entire cost to purchase all the parts necessary to built the EFI system, it was stretching my budget past what I wanted to spend.
The speed machine shop helping me, push the sale of the Sniper due to its self tuning and making any classic more drive-able.
They do not seat rings on a new engine with a new EFI installed and they say when they do dyno pulls after the EFI is installed, they are seeing slightly lower torque and hp numbers compared to the numbers on the same engine with a tuned carb.
I will be running a Quick Fuel 850 dp with no choke, because I’m real old school, want those slightly higher numbers, and need to keep within my budget (sort of).

 

As far as MPG gain as long as the carb is setup properly it will be about the same. If you 100% let it learn all operations WOT would be a little lower than a carb just due to the fact that I imagine the Holley engineers would err to the side of caution as far as how aggressive things would get as far as timing etc. I imagine if you manually tune everything it would be pretty close to a carb again all things being equal.

Now port fuel injection is an entirely different deal though. If you used some type of port fuel injection it should be superior in all places.

 

Was able to get the Sniper EFI fired last night. Can't say enough about the ease of the system and compatibility. Only issue we encountered was the system was flooding out during initial startup. Come to find out....it was totally my fault. When I purchased the Tank's Inc tank with fuel pump....I did the Tim the Tool man approach when I purchased it and went with a 225 LPG fuel pump and installed it in the tank. The sniper tried its best to keep up with the bigger fuel pump...but was way to much. Went ahead and installed the inline 109 fuel pump that came with the Sniper and it fired right up. The 383 just sat there and purred and it was really intriguing to stand there and and watch the system "learning" and "adjusting" itself. So glad I went this route.

 

Nice to hear.
Good luck.

 

I just put a Sniper on an 89' K5 Blazer with a 385hp Bluprint crate motor installed in it. I modified the HEI the crate motor came with to be a crank trigger and also installed a Speedway adjustable **** in place of the vacuum advance to be able to phase the reluctor wheel......the mechanical advance had to be removed and locked out as well with a plate that Speedway sells as well. We used the stock in-tank pump as a "lift" pump to the Holley inline pump. After I wired and checked everything it fired immediately........now it will be towed to the exhaust shop on Monday to have a nice dual system put on and a bung for the O2 sensor......I can't run it until the O2 is right...
Afterward I will check base timing and it will be good to go. Very straight forward and easy system.

Now that is a Q-jet kit you posted.......putting that on a stock Q-jet manifold seems redundant to me......I mean, the engine will run and run well....but I would put a newer modern intake under a standard spread bore Sniper and gain some ponies. Also block the heat riser ports and delete the heat riser valve if it is still there......the intake will run cooler.

The Sniper can be run without the timing control.....but why would you do that? Having the ability to do it and not utilize it is kinda corny as all it takes is some trigger wires, phasing and hooking up a coil driver....depending on the distributor you buy. I personally would use a small cap MSD and a separate coil as it is a lot easier to phase using their adjustable rotor.

All in all I am impressed with it........I am a die-hard carb guy, but my buddies collision shop took this on for a customer and he asked me if I would oversee the install.....

Jebby