You and your engine will be glad when you Go Atomic. You can get the ones for the Sniper here: I havent done it yet but i have been looking. The “at cruise” air/fuel setting I settled on is 16.5.
I started out at 13.1. which brings me back to "square one" and choosing between the FAST EZ-EFI 2.0 (1,200 hp) which might work great but looks ugly, the soon-to be released Holley "Sniper" (available in a 1,200 hp version) and looks real nice or the FiTech "Meanstreet" (800 hp) and last, the FiTech GO EFI 8 (1,200 hp. I'm looking to just convert to EFI, and have all advantages of it.
The weeks following the install saw me slowly increase the air/fuel ratio numbers to lean the system. It runs beautifully at the beach or on the Eisenhower Pass (11,150 feet) whether near freezing or on a 100-plus-degree day.
There's plenty of room in the world, and in the classic car hobby, for every type of car imaginable. Holley's products also include performance fuel pumps, intake manifolds & engine dress–up products for street performance, race and marine applications. 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. I never claimed that the Webers were superior to, or cheaper than, modern direct port injection. The only concern I had where all the issues people had with the Sniper. But has it gotten any better.
Remember, this is not a later model Vortech engine with better cylinder heads.
I think I’m done “tuning” the Sniper system, and the truck still runs as good as ever. Not a simple install. EFI is not something I was overly comfortable installing. I also noted that after some time, I could change those values as I saw fit. It’s running great. The positive benefit of being able to tune each cylinder individually cannot be overstated. During normal cruise-mode on the Interstate, I slowly leaned the air/fuel ratio (increased numbers) until I noticed the engine starting to surge slightly. This is the original 1979 350ci small-block. Smoother idle, control timing, ease of making changes. My initial idle air/fuel setting was 13.1. I backed it down to this setting. There is absolutely no 4 barrel carb that can give you the horsepower, and more importantly, the torque curve that a set of well sorted Webers can on ANY V-8. The roadster drives even more like a modern car now.". Mount and Blades-The Atomic throttle body will bolt in place of a standard square bore carburetor and accepts most common throttle and kick down linkages. Gives your classic the performance of a late model, Fear no trail - Runs vertical or at any angle. 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. EFI engines still need to warm up and, until they do, they require a richer mixture to run well. ie ease of instillation, tech support, noise, programing, operating problems, and any other plus or minus.
Anyone that tells you that from their own experiences just plain gave up on the Webers because they couldn't figure them out. https://www.msdperformance.com/produ...tbi/parts/2910, https://www.holley.com/products/fue...sniper_efi/sniper_4bbl_tbi_kits/parts/550-511, http://www.chevelles.com/forums/showthread.php?t=841082, VerticalScope Inc., 111 Peter, Suite 901, Toronto, Ontario, M5V 2H1, Canada. We'll send you the most interesting Chevy Hardcore articles, news, car features, and videos every week. Follow up.
Let’s face it, I had no previous experience before this.
As far as I am concerned, the Holley Sniper system will be a permanent fixture on the small-block in my truck. One of the great features of Holley’s Sniper is the ability to set your air/fuel ratio (AFR) where you want it. Now, Holley EFI products power these cars and are dominating the performance world.
Thats all. https://www.summitracing.com/parts/sne-550-510/overview/, VerticalScope Inc., 111 Peter Street, Suite 901, Toronto, Ontario, M5V 2H1, Canada. Holley carburetors have powered every NASCAR® Cup team and nearly every NHRA® Pro–Stock champion for four decades. The initial settings I chose were a happy medium between rich and lean, and as I said, initial mileage and drivability improved. The Atomic EFI outshines the competition in ease of installation and performance! I then pulled over and enriched the fuel mixture (lower numbers). 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. We promise not to use your email address for anything but exclusive updates from the Power Automedia Network.
It looks like the Sniper with a Holley dual sync distributor may be the best way to go.
As far as a fuel mileage increase? Chevy Hardcore NEWSLETTER - SIGN UP FREE! You wont have to let it warm up like a carb with a choke and I dont know how good you can tune a carb but based on that alone I believe I will get more performance out of the efi. I can pull into traffic without praying the engine won’t stumble or lurch. Browse our technical documentation and downloads for information on Atomic EFI. As a refresher, the Sniper EFI kit I installed is rated for engines developing up to 650 horsepower. ... 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. This is one area that too much really is a bad thing.
The install was completed on January 20, 2018, and it is now April 3, 2018. When the truck was getting fed through the Quadrajet, my highway mileage was 10.5 to 11.0 miles per gallon.
To avoid that scenario, I slowly increased the lean-ness of the incoming charge until the engine just started to react negatively, and then backed off. Not only did the truck drink less fuel, it gained some drivability.
Internal Fuel Rail-By integrating the fuel rail we were able to remove fitting connections to reduce the areas that a leak could develop (not to mention the enhanced appearance). Learn how to download and update your Atomic EFI. Holley products for GM's popular LS engine are dominating the LS scene as well. That means you don’t have to worry about configuring it during set up. I have adjusted the basic mixtures that I am comfortable with adjusting, and I am going to say that I was successful: the truck still runs, and I didn’t burn up any pistons.
These injectors feature a stainless steel ball and seat metering method for maximum internal sealing. That’s 10 weeks that I’ve been driving the Cheyenne since the install.
From hardware failures to install issues. Normally, I’m one of those not-so-adept follow-uppers.
). In the original article, I mentioned I was not an EFI expert, but after some simple research – and with the help of the Holley tech line – I was able to inflict some simple adjustments to make the Sniper even better for my application.I started by adjusting the fuel prime – which squirts a small amount of fuel into the intake to aid in start-up. Also in Tools, Shop Equipment & Chemicals -. It looks like the Sniper with a Holley dual sync distributor may be the best way to go.
698 hp on the dyno) as I rarely use 100% of it's power on the street and have no plans to race it either….
The power rating is because of injector flow.
All Rights Reserved. Better AFRs equal better idle quality, better starting, and better overall drivability throughout the rpm range. Could it really work that well?
No dog in this hunt either but that's kinda what efi systems do too huh?
ECU and Sensors-The ECU is integrated to the throttle body! Thank you for your time. I went as high as 16.9 and noticed the engine starting to surge. look at the FiTech systems they are really good as well and less than either of the ones you mentioned, I like the sniper and if your gonna get the kit with the pump an return line its cheaper than fitech with their fuel command center and the command center looks to big and bulky to put in my engine compartment, Sweet did u notice a difference in performance with the efi. 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. I'm not in the business of talking someone out of getting what they want.
These are the fuel injection kits we see most often discussed and debated … I know that might not be as impressive as a late-model vehicle that gets 18-plus mpg on the highway, but that would be comparing apples and oranges. Instead of a choke the control system has to richen the mixture some other way. Yes, it varies a small amount, but my pressure on the load pedal and the amount of fuel I put into the tank at each fill up can vary a small amount as well. Smoother idle, control timing, ease of making changes. Before I installed the Holley Sniper EFI on my C10, I was skeptical about the benefits I heard I would get. 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. Not the picture of efficiency when new. One thing to keep in mind: go too far and engine damage can result. © 2020 Holley Performance Products. I can't speak to your question, but for curiosity sake, i would like to know what kind of carburetor you now have, and why you are not satisfied with its operation ? 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. I am running a 340 stroker with less than 500 hp. We installed and ran all three units on a ’66 Biscayne wagon that has a very basic small-block Chevy in it. It doesn’t pop or sneeze if I drive it cold. Not a good idea. Atomic EFI systems were designed to simplify the installation and improve overall performance.
I want to get rid of the carburetor and convert my '71 big-block Chevelle to EFI using the MSD "Atomic" carb-replacement throttle body. © 2020 Power Automedia. As a single solution, or partnered with products from other Holley companies we can give you the edge you need over the competition!
MSD claims that their "Atomic" system is good for up to 625 hp...but I guess it would still be fine for my engine setup (496 cu.in. Good question.
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