HOW TO REPLACE FUEL INJECTORS & UPGRADES | HOLLEY SNIPER/TERMINATOR X EFI
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- Опубліковано 8 сер 2022
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Sniper/Terminator X Performance Fuel Injector - www.efisystempro.com/sniper-t...
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Forest Dryden Great info been having intermittent problem with my Sniper I'll check it out and do follow up Thanks
Good info, Thank you👍
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thanks for the video, does the sniper 2 use the same style injector?
Yes, the Sniper 2 uses the exact same injectors as the original Sniper, but with a much better connector for them.
If running a flex fuel sensor and using e85. How much hp will the stock 100lbs injectors support?
For a 4 injector Sniper with 100 lb/hr injectors on E85, you could support 450-500 HP with boost and 550-600 HP naturally aspirated. 8 injector Sniper is basically double that. Snipers can't read flex fuel sensors, but Terminator X can. Power numbers are the same for Sniper and Terminator X Stealth.
I have a stealth maxwith 4 injectors. Plan on 600 to the wheels with a turbo. Will the 120 support that
Yes, the 120 lb/hr injectors will support 750-800 HP no problem.
Is there any information as to why the Terminator Stealth with 8 100lb injector is rated at the same 650 NA HP as the 4 injector model, but 1250hp under boost? Like part number 550-1006.
The 4150 EFI units are rated by air flow for naturally aspirated use. 650-700 HP is about all you are going to get to flow through them air wise. When using boost of some sort you can force more air through the throttle body than the engine can just pull through on it's own.
I have the Sniper EFI on a Chevy 454HO Crate motor. There is a very annoying and loud clicking from the stock injectors that make the engine sound like shit when it is idling. Are your 120 lbs injectors any quieter than the stock Holley 100 lbs injectors? Thanks, Jack
Hey Jack, the loose connector can be an intermittent issue for sure. A zip-tie or heat shrink tubing could be the solution, but we have plenty of injectors if you finds that it is the injector itself.
@@efisystempro I didn't say I had a loose connector in my question. Are you implying that a loose connector will cause the loud clicking noise coming from the injectors? I was told that the clicking on the stock Holley Sniper injectors is normal. I was wondering if the 120 lbs injectors are any quiter. The engine runs great so I don't think I have a loose connector. Thanks, Jack
@@jackcrognale417 the 120 lb/hr injectors are basically identical to the original 100 lb/hr and will most likely make the same sound.
@@efisystempro Thank you
I had the passenger front injector stop working. It was just low pin tension. I had it happen a couple years ago. Took me a little bit to figure out.
Ive had 2 separate Sniper injectors fail
Both in the Front Pass side/ Primary Pass side. Interesting.
First what is low pin tension and I have the exact same on not working. Gonna take it apart now
@@arthurcoddington4682 low pin tension is when the female terminal doesn’t hold the male terminal tight enough.
So I can just buy the cheap-o Sniper, and throw in a set of 220lb/hr injectors (together with their flow data sheet ofc) for a higher hp boosted E85/meth application?? That's awesome
Sort of. You can put those injectors in there and it will run fine. The non Super Sniper can only read 14 psi of boost, so you are limited by that. Super Snipers can read up to 21 psi with the internal MAP sensor, but they also have the ability to run a remote mounted MAP sensor for even more boost than that.
Is there any power gain from swapping 100 to 120
No, upgrading injectors does not make power. The only reason for the upgrade is if the original injectors can't flow enough fuel for the power the engine makes
Hi,I need injector for Holley sniper efi 550-511 what kind I need to get
You need this www.efisystempro.com/sniper-terminator-x-efi-injectors-522-101x
How bout 210lb hr?
yea, the injectors install is super easy, but the problem is that for YEARS holley refused to sell/provide injectors for the sniper. They would sell them for the terminators, but when my injector locked up on my sniper last summer, holley would not get me a new injector, they only said I could send it in. They claimed that the injectors are a safety item and they can authorize a home repair of the unit. Insane. I had to find some used sniper injectors from a guy on the Holley forums. Has Holley now changed their policy and do they now sell actual sniper injectors? i sure hope so !
Holley still will not sell replacement injectors. They do not want people opening their Snipers. We have 100% direct replacement injectors for sale at this link though. They are the ones used in the video. www.efisystempro.com/sniper-terminator-x-efi-injectors-522-101x
@@efisystempro thank you for selling these! But Holley sells fuel Pumps, fuel fittings, other fuel injectors, fuel lines, etc… all
Of that is what is confusing to me… why draw the line at not selling injectors specific for the sniper ? And they do give you a new regulator/screen if you ask for one and then you have to “open up the sniper”. I’m glad you guys sell them and if I ever need any , you will
Be my first call. Back in 2020
When I had a sniper injector lock up (racing at a two day autocross event) I became
Baffled at how impossible it was to find a replacement injectior. Long story, long long story, but I’m good
Now and hopefully won’t need any other injectors
The regulator is much less invasive and much less chance for a problem. Many people don't understand the need to lube o-rings for installation, it is very easy to pinch one and create a leak. Aside from the regulator, Holley won't sell any parts that go inside a Sniper or Terminator X Stealth.
They told me the Exact same thing.
Like its impossible to replace an Injector.
Ridiculous
Hi I need injectors for Holley sniper efi 550-511,what kind I can use
Do any of you in the comments know if the super sniper with 4 injectors can be converted to an 8 injector? To reach the 1250hp rating. Thanks all.!
The ECU does not have the capability to run 8 injectors when it started as a 4 injector system. You can run much higher flowing injectors though. We have 220 lb/hr injectors that drop right in for $88.15 each. That would get you even more fuel flow than you would get with 8x 100 lb/hr injectors.
Hay Guys, bought a HyperSpark to compliment my Sniper from you guys a couple of years ago. I've watched a couple of 'experimental' videos of people downrating to smaller injectors EG 80lb which helped with over-fuelling and backsplash up into the air-cleaner (and reduced injector noise). One video appeared to show the increased pulse width of the lower lb injector led to a more granular tuning adjustment made by the ECU in the learned fuel table. Do you have any experience of having experimented with lower injectors, or could you pass comment on what if any effect this would have on longevity of the ECU's electronic drivers for the injectors.... For example, could lower injectors potentially put less load or strain on the Holley electronics? (Four barrel Sniper on 1969 351W)
Hi Rob, There really is no benefit to the ECU itself in downsizing the injectors. It is the same electrical load no matter the injector flow rate. The actual electrical parts are the same for all injectors that would fit in a Sniper with the only difference being the nozzle size. I have helped one customer downsize his injectors a year ago or so and while it works fine, it is pretty unnecessary unless you had a real small engine. If you have a V8 making 250 HP or more then there should be no need and if fuel is coming back up out of the throttle bores it sounds like there is a tuning issue or exhaust leak causing excess fuel flow.
@@efisystempro Thats brilliant thank you, and your absolutely right, the fuel thrown out the bores was due to over fuelling caused by a persistent exhaust leak (I kind of knew the answer to that already, but was interested in your take on it...). I had an intermittent injector which I just fixed (hopefully see how it holds) using the zip-tie trick, interestingly the thin and flexible copper wires (grey and white for rear driver’s side bore) are showing exposed copper between the rubber connector and wire sheathing. I'm really beginning to doubt the build quality of the Sniper MK1... Thanks again for your quick response to my questions.
can you go bigger than 120 ?
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Yes its possible, please email us or contact us via our website and our Tech Team will be more than happy to help you www.efisystempro.com/index.php?route=information/contact
Who sells Holley Sniper Fuel injectors?
Holley keeps telling me they won't sell them , individually , as a set , Nothing.
Just send the entire EFI unit back , because of 1 injector going bad.
Can you share a part number and or place to purchase them?
Thanks
522-101x is what the Sniper needs for injectors. www.efisystempro.com/sniper-terminator-x-efi-injectors-522-101x
@@efisystempro much appreciated. Ill order spares from You guys!! EFI PROS IS a great company!! Ive ordered and have has technical help from your company in the past. You guys ROCK!!!
When in doubt, watch UA-cam 😉😆😆
You definitely want to subscribe, more videos coming!!
Can you do a video on basic tuning for us cave men in the back?
We have many more videos in the works. Everything from troubleshooting to tuning. Be sure to subscribe and click the notification bell so you know when new videos come out.