Holley Sniper EFI Quick and Easy Improvement

The Holley Sniper EFI is a great improvement to the drivability of a hot rod...but...everything can be improved, and I can't leave anything alone...
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Tools Used For This Build:
Holley Sniper EFI 550-511 Amazon amzn.to/3zqEsFd
Progressive Linkage EFI System Pro bit.ly/EFISysPro
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Disclaimer:
Due to factors beyond the control of MoonBuilt Garage and WJM Industries LLC, we cannot guarantee against improper use or unauthorized modifications of this information. MoonBuilt Garage and WJM Industries LLC assume no liability for property damage or injury incurred as a result of any of the information contained in this video. Use this information at your own risk. MoonBuilt Garage and WJM Industries LLC recommend safe practices when working on vehicles and or with tools seen or implied in this video. Due to factors beyond the control of MoonBuilt Garage and WJM Industries LLC, no information contained in this video shall create any expressed or implied warranty or guarantee of any particular result. Any injury, damage, or loss that may result from improper use of these tools, equipment, or from the information contained in this video is the sole responsibility of the user and not MoonBuilt Garage or WJM Industries LLC.
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[@MoonBuiltGarage]

If you want to see more videos for my 1975 Dodge D100 Hot Rod Shop Truck project check out the entire playlist: kzbin.info/aero/PLFJrtVt3j-b8ELqwNGeQja0qIxK3nMwFX

[@CoroPlanesLLC]

Two things for people to consider when installing the progressive link. First, be sure the secondaries are remaining 100% closed at idle. In some cases the vacuum at idle can crack the secondaries open just a bit and cause a high idle. If this happens, you can add 1 turn to the spring on the secondaries to solve that problem. The second thing to remember is that if you are running a vacuum advance distributor, you can no longer use the ported vacuum tap. You will have to go to manifold vacuum because the ported vacuum is ported to the secondaries, and you will not get a vacuum signal until 40% throttle, rendering that port useless.

[@ElViejoNL]

I think the better solution to solve the sensitive throttle, leaving the progressive alone and ordering, 20-16 Sniper EFI Throttle Lever. This changes the pivot point of the throttle cable. I just did mine last week. It was night and day. I was afraid to drive the truck prior to this as throttle was extremely sensitive.

[@MoonBuiltGarage]

That is an option...I actually ordered both, but decided to try the linkage first...I may still play around and try the throttle lever to compare the two

[@ElViejoNL]

@@MoonBuiltGarage yes. Give it a try. You'll be surprised! Good luck and thanks for the informative video.

[@designsinorbit]

Yeah, count me in man. My 4:11 gears + the sticky gas pedal is a tire burner every time.

[@MoonBuiltGarage]

That linear linkage made a huge difference in the off-the-line driveability....I don't feel like I need to feather the pedal now

[@JD2CYLINDERNUT]

Makes sense. My throttle pressure seems too much in the pedal and sensitive. I put the linkage in to improve tip over but I think I still would like to try the progressive linkage for secondaries. I’ve got idle surge when it gets hot, scratching my head on that. Thanks for the video.

[@MoonBuiltGarage]

I still have the extended linkage, but I don't think I need it..the progressive linkage feels so much better already

[@toddselph5992]

I have a sniper on my car. I bought one of those progressive linkages but never installed it. I was afraid it would cause a tuning issue. I did get one of those throttle extensions because the pedal is hard to press and it only helped a little. Your video has got me to thinking about installing that progressive linkages again. No telling where I put it though. LOL

[@MoonBuiltGarage]

I actually ordered both, and decided to do one at a time....I honestly don't think I need the extension with the progressive linkage installed

[@chuckdavis3587]

When you put the progressive linkage in you also make the change to the setting in the controller. After I added mine it made no change to the tuning.

[@servandocabrales2213]

@@MoonBuiltGarage where can i order the progressive linkage from?

[@MoonBuiltGarage]

Link in the video description....

[@crouchingwombathiddenquoll5641]

My transmission valve cable from the sniper was not adjusted properly. Cooked the trans. New trans , spent time fine tuning the tv cable. Shifts ok now, however the sniper bog's down. Doing my head in, so going to a professional tuner. I do like the cold start with EFI.

[@Celticman197]

Detroit Muscle installed my system, and it's running 100% better than the MSD Atomic I had. So I don't want to mess with it.

[@MoonBuiltGarage]

Where's the fun in that?!? LOL...I can't leave well-enough alone

[@dewholdingsllc1050]

Thanks for the feedback on this system. Once you get it dialed in how about testing the MSD system and comparing the two systems. I’m told the MSD system is very good.

[@MoonBuiltGarage]

I'd be happy to....how long until you send me one? 🤣

[@dewholdingsllc1050]

@@MoonBuiltGarage how about a go fund my project page for folks who are interested in learning?

[@MoonBuiltGarage]

Since Holley owns MSD I'm sure they are probably pretty similar. Plus, I was curious and went to Holley to look at the Atomic EFI, and they now have the Atomic 2, which looks even more like the Sniper, especially in the controller and the way they packaged everything into the throttle body just like the Sniper. Even the price points are almost identical....

[@trentdawg2832]

Get a derale transmission pan…..the one that has the cooling tubes built into it……best cooling thing ive ever done to my transmission….and as a bonus they come with a temp sensor bung already installed……its around $200 best money ive spent towards transmission cooling

[@WayneMontes-mh7bp]

Hi i have a 1971 c10 350 4 barrel Holly 650 I’m thinking to buy efi or a 5.3 I don’t know what do 🤷🏻‍♂️ Just asking your opinion Let me know thank you

[@armygreenfj3924]

How do you like the sniper so far?

[@seandoyle6168]

This guy made a great 4min vid in just under 15 min

[@MoonBuiltGarage]

🙄 Very insightful critique....

[@TheNightstalker67]

@@MoonBuiltGarage don't listen to this nonsense, thank you for making the video!

[@droellgreen4186]

I'm have no idea about this work, but it's amazing,,I'm wondering will the efi 7 in will link up to the 396 fuel injection stroker motor

[@garagechronicles9008]

Nice work, sir. I'm just starting a resto mod 69 Camaro. I'm going to use this system with a 427 and an automatic. Your info was helpful in me understanding this system better. Check in to the channel for progress.

[@MoonBuiltGarage]

I'll have to check out your channel...I've been thinking about doing a beetle at some point so I'll keep your channel in mind

[@Jmusiquex]

I have a 1986 olds cutlass. I’m installing the Holley to it. Do I use two 02 sensor, can I disconnect the cars 02 and install Holleys 02 in its place. Need help.

[@michaelhale4918]

You have to be careful what you are telling people! When you install that linkage, you also have to change the enrichment table along with it. If you look down into secondaries even with your wizard programmed, they are still dumping fuel, doesn't matter if they are open or not. You have to program the unit not to dump fuel till the tps gets to the desired percentage. It's called acceleration enrichment correction.

[@MoonBuiltGarage]

I did a video on that....

[@jamesharnichar7110]

Hi I just watched your video, I also have a Holley EFI I am trying to get better gas mileage, so did your upgrade did you get better gas mileage. Thank you Jim

[@MoonBuiltGarage]

Hard to say right now...it definitely drove better. I've been working on the tune, but ran into some....technical difficulties lol....not so much with the Sniper, but...hardware issues you cold say...

[@Wilson_Racing]

I havent had any issues leaving a stop sign slowly with the 400sbc in my 3rd gen Camaro that has 3.73s and the stock throttle linkage on the Sniper unit. With the progressive linkage you do lose a bit of power because only one set of butterflies are opening until you get to 30%(ish) throttle. I think it's worth trading more power for a bit less fuel mileage

[@MoonBuiltGarage]

I haven't noticed any loss of power...one set of butterflies opening at first is just like a normal carb...I would think it is just the opposite, with both butterflies opening together at low rpm you are more likely to give the engine too much fuel, causing a rich condition or even flooding the engine

[@Wilson_Racing]

@@MoonBuiltGarage double pumper holleys should open all 4 barrels at once, I had one before I swapped to EFI. I dont have any rich conditions when I floor it from a dead stop but I have the Hyperspark system too, my car didnt take long to tune and it runs great without progressive linkage. Any rich or flooding conditions would be tune related and the self learn should fix that. I had nothing but issues with the external fuel pump Holley provided and went through three of them before going upgrading to a in-tank 525LPH pump and Holley HydraMat. I had the external pump below the tank and as close as possible but it kept aerating the fuel and wore the pumps out.

[@CoroPlanesLLC]

There is no difference in power. You just have to push the pedal down a bit more. Your engine does not care if you have 1, 2, or 4 butterflies. All it knows is how much air and fuel is coming in. If 4 butterflies open 3% gives you x amount of power; you may have to go to 5% or 8% to get the same amount of air to make the same amount of power. The bottom line is you need a certain CFM of air and the proper AFR.

[@deviantrebel6326]

What engine, cam and gears are you using?

[@johnhines7863]

I installed the linkage. I can’t find the screen where you are supposed the enable the prgessive linkage and change the percentage. Do I need a software update?

[@ramondelgado6045]

Same any updates ?

[@dantheadventureman]

Did you have to change your distributor vacuum line to go to manifold vacuum? The company that sells the progressive linkage says it will not work if distributor vacuum is in the sniper unit itself. Reason being is the vacuum works off of the secondaries and if they don't open right away then it messes things up.

[@MoonBuiltGarage]

I'm not running a vacuum distributor

[@hubertbryant5587]

This linkage looks like the Holley carb linkgage

[@toon_on_24s]

Thanks for this video

[@MoonBuiltGarage]

👍

[@michaelmutphy9077]

Don’t know if you fixed your trans problem or not. I rebuilt transmission for almost 40 years and in my experience with the Chrysler old units came down to the toque converter clutch comes apart and clogged the return oil from the cooler. The first place it goes is to the old. With no lube oil going back to the transmission you have a meltdown.

[@MoonBuiltGarage]

Seems like the trans is working well. I haven't heard of the torque converter problem

[@michaelmutphy9077]

@@MoonBuiltGarage sounds good. That generally happened when the converter bolts were to long. They would bottom out and dimple the converter where the lockup clutch engages causing a chatter on engagement. Then the lining would come apart and clog the cooler.

[@billbill6655]

Mine performance wise fell on its face when I tried the progressive linkage

[@MoonBuiltGarage]

Did you change the tune to account for the linkage?

[@shaunallen8902]

Do you have a reading on gas mileage with the carb, before the EFI install? Thanks

[@MoonBuiltGarage]

I don't...I wish I had just to make the comparison, but I didn't think of it until after making the switch

[@wjcoates]

Where can I buy the progressive linkage part?

[@MoonBuiltGarage]

For the amount of time it took you to write this question....or for less than the amount of time it is going to take you to read my response...you could have looked for the link by reading the description 🤣

[@wjcoates]

@@MoonBuiltGarage Thanks for your response. However, I must be too stupid to follow your simple instructions.I see no link to click on. I hover on ' Holley Sniper EFI Quick Improvement' and no link appears and I see it nowhere else. I subscribed to your channel because of the content is of interest to me for the varied content, not only the Holley stuff. Could you just provide me with the link to humour me [lease?

[@MoonBuiltGarage]

The url is there...copy and paste...bit.ly/EFISysPro

[@wjcoates]

@@MoonBuiltGarage Thank you.

[@williamjones9777]

So where can I get the new linkage ? You didn't say.

[@MoonBuiltGarage]

Link in the description

[@Marc_Wolfe]

oh boy... loud music...