The Meanstreet EFI has no timing control... A forum community dedicated to Chevrolet Chevelle owners and enthusiasts. From hardware failures to install issues. To say I’m happy with the results is an understatement. Follow up. How does 14.0 to 14.5 on the highway sound? 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. This is the original 1979 350ci small-block. Before I installed the Holley Sniper EFI on my C10, I was skeptical about the benefits I heard I would get. Thank you for your time. No dog in this hunt either but that's kinda what efi systems do too huh? We'll send you the most interesting Chevy Hardcore articles, news, car features, and videos every week. I then pulled over and enriched the fuel mixture (lower numbers). JavaScript is disabled. First time you go WOT you'll go way lean as the injectors can't flow enough fuel. His passion for performance got him noticed by many locals, and he began helping them modify their vehicles. Usually, deadlines don’t afford me the opportunity to go back and revisit an install I had done months prior. The positive benefit of being able to tune each cylinder individually cannot be overstated. Are retrofit efi systems throttle body injected? Chevy Hardcore NEWSLETTER - SIGN UP FREE! My initial idle air/fuel setting was 13.1. Holley carburetors have powered every NASCAR® Cup team and nearly every NHRA® Pro–Stock champion for four decades. As a refresher, the Sniper EFI kit I installed is rated for engines developing up to 650 horsepower. Injectors-Fuel delivery is provided by four precision 80-pound injectors. EFI is not something I was overly comfortable installing. 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). Not a good idea. There's plenty of room in the world, and in the classic car hobby, for every type of car imaginable. I never claimed that the Webers were superior to, or cheaper than, modern direct port injection. Holley didn’t cut corners when it comes to upgrading the look of the Sniper 550511 over other Holley EFI systems, and that’s why it has a tougher look to it. 105 Posts . That means you don’t have to worry about configuring it during set up. Now, Holley EFI products power these cars and are dominating the performance world. Browse our technical documentation and downloads for information on Atomic EFI. Holley® has been the undisputed leader in fuel systems for over 100 years. Smoother idle, control timing, ease of making changes. 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. You and your engine will be glad when you Go Atomic. The roadster drives even more like a modern car now.". These are the fuel injection kits we see most often discussed and debated … We will safeguard your e-mail and only send content you request. They are not a direct replacement you have to run a return line and change all the rubber line out to efi line but it dont look very hard to me! For a secure mount the injectors are sealed between the housing and the cast fuel rails. 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. Normally, I’m one of those not-so-adept follow-uppers. Build your own custom newsletter with the content you love from Chevy Hardcore, directly to your inbox, absolutely FREE! But this time, I made an exception. 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. Holley carburetors have powered every NASCAR® Cup team and nearly every NHRA® Pro–Stock champion for four decades. Hello I was looking at these two efi systems for my 1968 mustang and was wondering if there are any real differences between them besides the huge price difference. The “at cruise” air/fuel setting I settled on is 16.5. These injectors feature a stainless steel ball and seat metering method for maximum internal sealing. 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. Holley has been the undisputed leader in fuel systems for over 100 years. ... 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. Remember, this is not a later model Vortech engine with better cylinder heads. Also, with no contact, there is nothing to wear out or replace. 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. Come join the discussion about restorations, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! It doesn’t pop or sneeze if I drive it cold. It’s running great. Next came air/fuel ratio adjustments. It runs beautifully at the beach or on the Eisenhower Pass (11,150 feet) whether near freezing or on a 100-plus-degree day. Holley® has been the undisputed leader in fuel systems for over 100 years. The only concern I had where all the issues people had with the Sniper. © 2020 Holley Performance Products. 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. *We might be biased but really, look at them! 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 started out at 13.1. One thing to keep in mind: go too far and engine damage can result. Randy Bolig has been working on cars and has been involved in the hobby ever since he bought his first car when he was only 14 years old. I think I’m done “tuning” the Sniper system, and the truck still runs as good as ever. It looks like the Sniper with a Holley dual sync distributor may be the best way to go. We promise not to use your email address for anything but exclusive updates from the Power Automedia Network. A few months have passed, and I am certain you would like to know if it is actually delivering any substantial benefits. We installed and ran all three units on a ’66 Biscayne wagon that has a very basic small-block Chevy in it. 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. Here we look at the Holley Sniper, FiTech Go Street EFI, and the FAST EZ-EFI. 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. 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But has it gotten any better. 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. I am converting my carb to EFI. All rights reserved. Holley carburetors have powered every NASCAR® Cup team and nearly every NHRA® Pro–Stock champion for four decades. I am running a 340 stroker with less than 500 hp. I also noted that after some time, I could change those values as I saw fit. In many ways they are similar in function, with the obvious difference that with the Webers, the tuner is the "brain" vs. a computer. 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. I can’t say whether or not I made any major improvements in that area, but I didn’t hurt it either. 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. 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.

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