After installing the Sniper and running for a few weeks with the initial air/fuel settings as mentioned, I saw roughly 1 ½ to two-miles per gallon increase. © 2020 Power Automedia. I started by adjusting the fuel prime – which squirts a small amount of fuel into the intake to aid in start-up. JavaScript is disabled. Are retrofit efi systems throttle body injected? *We might be biased but really, look at them! The positive benefit of being able to tune each cylinder individually cannot be overstated. I didn’t change the WOT air/fuel ratio too much – yet. A few months have passed, and I am certain you would like to know if it is actually delivering any substantial benefits. I have a 66 with a 408 stroker and right now i have a 650 double pumper that works well, but the efi would be better. Let’s face it, I had no previous experience before this. The roadster drives even more like a modern car now.". Anyone that tells you that from their own experiences just plain gave up on the Webers because they couldn't figure them out. As I stated in the original article, I really have no background in EFI tuning – and even less knowledge of computer programming, so, upgrading to EFI had to be idiot proof. Thank you for your time. Our pick for the best overall aftermarket EFI system is the New Holley Sniper 550511 EFI Kit because it provides a great deal of functionality. It’s not something that a lot of automotive writers are adept at doing. These are the fuel injection kits we see most often discussed and debated … His passion for performance got him noticed by many locals, and he began helping them modify their vehicles. Holley's products also include performance fuel pumps, intake manifolds & engine dress–up products for street performance, race and marine applications. You and your engine will be glad when you Go Atomic.

I also noted that after some time, I could change those values as I saw fit. It’s running great. Remember, this is not a later model Vortech engine with better cylinder heads. The weeks following the install saw me slowly increase the air/fuel ratio numbers to lean the system. If working correctly you may perceive that as being easier or better but its really more complicated and if it doesn't work properly the fix will also be more complicated. The MSD annular ring injection design produces an air/fuel charge with much better mixture as well as an even distribution among the cylinders that our competition cannot match.

One thing to keep in mind: go too far and engine damage can result. When I finished the install on my C10, I set it as follows: 13.1 at idle, 14.2 at cruise, and 12.9 at WOT. For a secure mount the injectors are sealed between the housing and the cast fuel rails. But this time, I made an exception. ... My friend has an atomic efi system on his 351W and I am shocked how well it runs and how simple it was to install. Good question.

I’m still more than happy with how the system is working, and as I stated I might do in the original article, I did some tweaking to see if I could increase fuel mileage. Maybe you already know what you will be getting into, but before buying any kind of fuel injection system, I'd download the instructions for installing one. As far as a fuel mileage increase? We installed and ran all three units on a ’66 Biscayne wagon that has a very basic small-block Chevy in it. It runs beautifully at the beach or on the Eisenhower Pass (11,150 feet) whether near freezing or on a 100-plus-degree day. I backed it down to this setting. © 2017 Power Automedia. my response was directed at the comment(s) made which were more or less were discounting any advantage that the Weber / IR induction had over the 4 barrel carb / plenum manifold.

Holley® has been the undisputed leader in fuel systems for over 100 years.

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