Answering your questions about Holley's Sniper Stealth EFI
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- čas přidán 29. 07. 2024
- Ever since I installed Holley's Sniper stealth EFI on my 68 Camaro I have had tons of questions about it. I made this video to answer your most asked questions about the EFI system. If you have any other questions be sure to leave them in the comments below.
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Do it...... every thing this young man has said describes my experience with the sniper. My 63 year old truck (bit modified) has become my daily driver because it starts and drives like a modern reliable car. Really enjoying the vehicle now, not just a shed trophy.
I really appreciate your video bro! I am about to put sniper efi on my Chevelle and you sold me on it.
Thats awesome!! Im glad that I was able to help you out! If you find you have other questions about the sniper set up feel free to ask!
We've got our truck at The Shop getting new engine and tranny installed, sitting atop the new engine is the Sniper 550-510 unit. We upgraded for obviously more power, reliability and going it'll help fuel economy. The old big block was getting 7mpg out of a factory 2 barrel carb, this new engine is small block 351W bored .60 over and has been built up quite a bit but we're still around 500-550hp, even so it should get better fuel economy than the big block did😆
thank you for the info!
The amount of time I have in tuning my carb is probably more than what it took to install this 😅 I'm definitely going to look into it in the future
Great video man! You have me convinced and gained a subscriber!
thank you!!😀 Welcome to the channel!!
Great advice bro. You convinced me. I’m installing a Sniper 4500 on my BB Chevy as we speak.
Glad I could help you out. What is the bb chevy going in?
@@AcesGarage1970 SS Chevelle. 582 cubic inches
First video of yours I’ve seen, immediately impressed with the quality and video style. Keep up the great work!
Thank you for this video, I’m considering installation of the EFI on my 351w I’m based in the UK and theres really not enough information that explains the pros & cons on this set up, so hearing it in a “Nutshell” was good enough for me! Thanks Again. 🇬🇧
Thanks for watching the vid. 351w is a great engine. I have been debating putting a 351w in my f100 with sniper, but i found a free 4.6l cobra engine so I'm going to use a terminator set up on that one. Be sure to be on the look out I have a couple more videos I'm putting together about the sniper efi.
I’ve got it on 351w base 410 stroker……if you install the sniper exactly as Holley instructs you will still have a lot of test and tune. It’s not a bolt on and run system. Got it running good then car sat up for 3 weeks and it’s back to square one. It’s pretty frustrating actually. The sensors are junk. You will find different opinions on the sniper but bottom line…..it’s not weekend warrior friendly.
@@jeffreyshingleton6282 your engine is the build I was originally going to do for my f100, when it was running good how did you like the 410? Thanks for the info. Only issue I have run into with sniper was my fault, my battery was weak and when my fan kicked on, the voltage would drop to low for the car to run right. swapped my battery and all was good.
@@AcesGarage it’s strong. Built it for a 68 fastback, t-5 transmission, built 9” with 396’s. Craft Performance did the motor. Prolly around 550 hp. Plenty for that car. Just trying to get this efi right.
@@jeffreyshingleton6282 Thanks so much for replying, I am a weekend worrier..so I take your point, I’ve purchased it and will be fitting over the forthcoming weekends, I’ll post good & bad on how things go! 🤞🏽 I went with the Efi as I was so fed up with float flooding and crap cold starts over here in the Uk… Sounds like I’ll continue having fun setting it up until I get it right…or NOT?? 🇬🇧. Cars Eh?
I like my base sniper. Has issues here and there but overall am very satisfied going on 6 years with it
What kind of issues you have had with it? So far I have not had any issues with mine, but I have only had mine around 1½ years
Excellent informative video, thank you, from Australia ✌🏼🇦🇺🌏
Thanks for checking out the vid!! I often forget these vids can be seen all around the world! It is awesome to see people watching from other countries. Australia is about as far as you can get from Florida.
@@AcesGarage really enjoying your videos. We live in Queensland Australia. I think a similar climate to your Florida, beautiful one day, perfect the next 😁👍🏼
@@crouchingwombathiddenquoll5641 I live in Central Florida not to far from Orlando / Disney area. The weather is pretty nice 🏖
Also your user name is awesome!
Just had to drop bear in here on this comment as i'm Aussie too, looking for sniper info @Ace's Garage thanks for explaining your experience and knowledge. Great quality and easy to understand. Cheers !
Thank you.
I'm glad I could help.
great intro vid for holly sniper system i just got my car running with the super sniper set up i bought the whole 9 yards from holly they hooked me hook line and sinker and now i feel like im part owner of ther co. lol... anyways i got it running with there basic tune to make it happy to run but still needs alot of tuning im almost over whelmed with how many fine settings there is and almost dont know where to start im running twin turbos also i bought the holly pro dash it needs to be configured in it will probably take me of firguring out all this stuff . wish there was a vid for super sniper for dummys never the less i enjoyed your vid good job thanks Bill
I'm dont want to be a holley fan boy, but they really have everything and anything you would need to make their system work with any setup. Not that other kits aren't good they just don't have the same infrastructure as holley does. Wish I could help you with tuning, I have watched and read tons of info on how to tune but haven't had the opportunity to do it myself yet. My f100 will be the vehicle I start tuning my own stuff with, and i will be doing vids of that as well. The camaro is more show than go since it's the wife's car. Only advice I can suggest is small changes don't rush tuning. But yeah I agree there are tons of parameters to go thru, it's great but also overwhelming.
Watched a lot of videos on Sniper setups and yours is the first I’ve seen that talks about the use of a sump. Was not looking forward to running a return line back to the tank (plumbing plus fittings into the tank), sump would be so much simpler. Also, my tank has no baffles so hard cornering at less than half full results in stuttering as it sucks air. Solves that too! Thanks for the tip!
Glad I could help!
You can run the return line to the fuel filler neck. Just remove it instead of the whole tank. Holley tech support actually says it’s just fine.
Great video! 👍
Thank you!
@@AcesGarage 😁👍, no problem brother, keep up the good work.
good video man igot the Sniper X-flow its good for 800HP i have a built moper 408 in my truckand the x-flow works great on my truckafter a little tuning on it
and you talked about price now i had a fully built race carb on my truck that i paid $1300 for and the x-flow and the in fuel cell pump set up was around $2000 so the price differance really isn't that much and like you said the drivabilitly is so much better then the carb set up now i haven't had my truck on the track with the efi yet but it really doesn't feel like it has lost any power with the sniper ill just have to see if the truck still runs 6.70's in the 1/8 with EFI
If you already have the kit for 650 na and want to go boost, you can change the injectors to bigger ones and change the map to a gm 2 bar or 2.5 bar. You will have to change those perameters in tune tho. But it wasnt difficult at all.
I've heard you could do that with a Super Sniper kit but not on the regular Sniper kits. I don't see why it wouldn't work on a regular Sniper as well thou. I would most likely upgrade to a terminator instead of modifying my Sniper kit. The extra features a terminator kit provided would be better for the tuning I would want to do on a boosted application.
@@AcesGarage Ya, not sure on sniper. I just did it to the terminator tbi setup i have on my sons 5.3 foxbody. It uses the holly hp external hp ecu. I swapped out he the 4 injectors in the tb to bigger 2000cc injectors and the map sensor with a gm 2 bar. My tuner did the rest. Which was straight forward by changing the map and inj size in the ecu progamming via labtop.
I'm definitely going carb efi however I believe most people don't have the proper carb setup. I have zero issues with my carb. The Only reason I'm going to switch to a efi carb is due to better fuel mileage
I got nothing against carburetors they work. My f100 is rocking a carburetor and she drives just fine, and she will remain that way till I swap my frame to a crown vic chassis. And I agree, most people don't have the proper carb set up. What kind of car you planning on swapping to EFI?
@@AcesGarage I have a 87 monte carlo SS 396sbc stroker 750dp quick fuel carb
@@ssgang777 396 in a Monte! That is gonna be a beast!!
@@AcesGarage yessirrr it is.
Did you look into the pro-flo 4 at all? Also for that Edelbrock pump you're going to put on your truck, have you thought about where the vent is going to go? I've heard of it going back to the tank, into the air cleaner or just to a charcoal filter. What would you do?
I have looked into the pro-flo and I do like it but I didn't see the point in spending an extra $1000 dollars for my build. It wouldn't gain me any extra performance. For the pump I would probably run it to my air cleaner for the f100 but really depends on your build on where you want to run it to. Ideally running it to a charcoal canister or tank would be best to keep the fuel smell down if the car lives in a garage.
Nice video mate really good quality.
Can you tell
Me and other viewrs the gains in fuel economy pleass
Thanks! My tanks are lasting much farther than they used to. It drive it more and fill up way less. But I never knew what kind of fuel mileage I got before so I can't say how much more I got exactly.
@@AcesGarage thankyou man appreciate it
Would you use this for initial start up and cam break in or would you trust carbs for that then swap over once the cams broken in
I would be fine with breaking everything in with an EFI unit. I feel it would be better actually. The engine would idle smoother and be decently tuned from the get go allowing everything to settle in nicely.
Great video!
Thanks for the video. Does the Holley system have much self diagnostic capability?
You can view quite a few data points right on the touch screen that comes with it. AFR, TPS, ECT, RPM. Plus you can plug in laptop and modify timing curves and fuel ratios. There are also additional wires that are wired in so you can add a few additional sensors to monitor if you like. Sniper Efi itself is actually a very basic system doesn't require much to diagnose. Most of the issues I see people have are usually the result of them not following the instructions, but not always.
@@AcesGarage Thanks for getting back to me. I understand what you are saying. My background with OEM fuel injection started with learning their diagnostic capabilities. And grew from there into modifying systems, then tuning them. I understand the Holley system is fairly straightforward, but then again carburetors are too. I had hoped Holley included more in the way of self diagnostics.
I completely agree with you about repairing problems before installing the system. I have seen two people switch to aftermarket efi and have the exact same problems after doing so. One had a bad ignition coil. He blamed the carb, switched to efi, spent thousands, and it barely ran. A $40 coil from the parts store fixed it. The other guy had a terrible miss. An internet forum convinced him to go efi. Turns out he had a blown head gasket between two cylinders. That same forum convinced him to put a LS in it, which he started to do rather than fix his old small block. As far as I know, that car hasn't run since.
@@v8packard no problem, appreciate you checking out the video. I get it, I am on a few forums and facebook groups, and all the time see people reccomend things that people don't need. Dont't get me wrong I'm not perfect but some of the comments put out there just make no sense. I had one guy post he has a very well built 408 in a f100, his engine would bog down and coulnd't do a burn out. The 1st person who posted said he needed a higher stall converter and a bunch of people said the same. I asked him to send a pic of his spark plugs. Turned out his timing was way off and the carb was dumping fuel. A little tuning and the truck was burning tires easliy.
I’ve heard some people say it cleans up the raw fuel smell. Obviously depends how carb is tuned, but have you noticed a reduction in gas smell while drive or sitting in the garage?
That's a good point I never thought about before. But your right, I used to always have a fuel smell in the garage, and now I don't.
Hey does that sump pump need’s return line
Depends on which brand you get and your overall set up. If you get an edelbrock one inline with the mechanical pump then no. It has internal floats like a carburetor that regulate the fuel level. And the return line from the mechanical pump just works like it normally does. Some other brands do have ports for return lines.
I installed one on a 64 bel air and I ain’t getting any fuel to the injectors and also I have no pulse
Make sure your keyed 12 volt connection has a full 12 volts while cranking. If it doesn't see 12 volts while cranking it will not trigger your fuel pump relay or pulse the injectors.
I have the sniper stealth 4150 I haven’t installed yet on my GTO my question is I have a Pontiac 455 with a procharger so I need to lock out my timing? I’m told locking out timing is hard on an engine any info would be appreciated thanks
That's going to be a fun car!! you can lock out the timing but as you said it is hard on the engine plus with locking out your timing drivability and power go down. You can use the sniper to control your timing which requires some sort of electronic controller box or a sniper hyper spark . If you have sniper control your timing you will need to lock out your timing so sniper can control the timing curve electronically which is the way i would go, sniper will advance and retard timing based on boost and engine load for you, which will give you good drivability and good power. Holley has a 48 page pdf instruction manual that does go over this in good detail, its towards the bottom of the page under Tech Resources
www.holley.com/products/fuel_systems/fuel_injection/sniper_efi/sniper_efi_stealth_4150/sniper_efi_stealth_4150/parts/550-870
Also Holley has made a decent vid explaining how to set it all up
czcams.com/video/oBSiyeg4XCU/video.html
Hope all this helps! Thanks for the question!
@@AcesGarage thanks for the info I may have more questions as I go further lol
why didn't you go with the terminator stealth?
For my Camaro I didn't need the extra features that come with the terminator. It was built for my wife and is more of a show car so I didn't need to pay the extra cost for features I would never use. For my f100 that is going to be a performance build I would do a terminator set up over sniper all day long.
Do I have to buy another intake manifold to install sniper? I have a Pontiac performer from edlebrock.
It will fit on any intake that has the hole pattern for a 4 barrel holley, 4160. Just be sure that there is not a solid wall between the long and short runner sides. If it does, then you will either need to run a small spacer or dremmel out a portion of the divider for it to run right.
czcams.com/video/FJnHas39iN8/video.html I talk more about this in this vid if you haven't already seen it.
How about liquid propane fuel?
I have no idea if sniper can run with liquid propane. I quickly looked around online and did not find anything or anyone who has.
Hope mine works as well… did you use the coil and distributor?
My car has a msd distributor, blaster 2 coil, and a 6a ignition box. So I ended up plugging in 1 extra cable, points in to points out if i remeber correctly, to make it work with the sniper. I have had no issues with it set up like that. I did have to lock out the mechanical advance, in the distributor to make it work properly as well.
@@AcesGarage thanks, I went all in. Got the hyperspark ignition and distributor. Got it 3 yrs ago, but just now getting panel truck put together. Good stuff on your channel, thanks again
@James Campbell may have been 3 years but you are doing it!! That's what counts! Keep me posted I'm excited to see how your set up works with the hyper spark set up. I debated it myself, but I couldn't justify swapping out a perfectly good msd set up.
I just realized you have the 4150 sniper. Did that master kit come with everything you needed for the install?
I didn't use the master kit. I ordered the sniper EFI base kit. Then ordered an in-tank fuel pump for a 1st gen camaro specifically for holley sniper, it has a built-in fuel pressure regulator so i did not have to run a return line back to my tank, i could hook up directly to my existing fuel line. I wanted an intank pump so it would be quiter and the pump could stay cooler for longevity. I added some earls fuel line with the fittings and filter so I could put together my own custom fuel system to match the camaros style.
If I was going to build an off road rig I would use a surge tank with built in pump and reg so that way I wouldn't starve the fuel pump in off camber situations.
My camaro doesn't have a baffled tank, so if my tank is low on fuel and I stop hard or take a turn slowly the pump won't suck up fuel and my engine will stumble or even stall depending on the exact situation.
@@AcesGarage so you didnt need to run a return with the in tank fuel pump? Also this is for my k5 blazer 4x4 vehicle. So you recommend getting the surge tank like the edelbrock to hook up to the Holley Sniper?
@ArmyGreenFJ no return line required for my style fuel pump/ regulator combo. It was a whole in tank unit designed by holley for sniper. It pressure regulator is mounted in the tank on the sending unit. And it relieves the extra pressure back into the tank, so no return line required.
I am not sure what style tank is in a k5. If it has a sump or a baffled tank already, it shouldnt need a surge tank because those style tanks already keep fuel around the intake line. But if it doesn't have thise style tanks. The edelbrock surge tank is what I would go with. It acts as a mini fuel resevior that always keeps the pump submerged so you always have fuel to pull from not just what is in the fuel line. Last thing I would want is to be going up a hill and my engine stalling out because all my fuel in my tank has settled to the rear of the tank and it runs dry. Carburetors don't usually have this issue because they have bowls of fuel on the carb to pull from so if there is a few seconds of no fuel coming in they can still run what in the bowls. With sniper you essentially need to add that bowl inline for that reserve. Or make sure your primary fuel tank has something to help keep a reserve amount of fuel around the intake in the tank. It's probably the biggest issues that comes up with aftermarket efi kits.
@@AcesGarage thats really good to know. I appreciate the tip! Thank you!
@ArmyGreenFJ glad I could help out! That's a big part of why I started the channel. To help people out with their builds.
I have a 1968 Camaro and I am tired of always tuning and buying spark plugs. Mainly due to the elevation
I've been in Florida too long. Elevation didn't even cross my mind. Lol
Have you been driving it daily? Im considering it but not sure if its worth the upgrade. Currently running a AVS2 and starts right up all the time..
Unfortunately, the camaro isn't a daily driver. She does get driven multiple times a week but not far, as I have to constantly move it to work on my f100. I not going to say the carburetor doesn't do the job but there is always a trade off with a carb. You either get good gas mileage or max power. and to keep either max power or fuel economy you have to tune constantly for temp changes. With EFI you don't have to constantly tune to get the best of both. Better fuel economy, just as much power as a carb, no constant tuning to achieve both at the same time. I would 100% go efi for a daily. But I will say the avs2 is a good carb.
@@AcesGarage thanks for replying…I’ll probably stick with my carb setup for now..maybe in a year or 2 I’ll switch over to EFI.
@ArmyGreenFJ no problem, thanks for watching the vid! Since you already have a good carb. There is no real reason to spend the cash to swap over to efi in a hurry. AVS2 carbs are good for daily drivers. Use it till it's time for a rebuild. With today's fuels every carb is gonna have to get rebuilt more often now. If you didn't have one already I would recommend more to spend the extra for efi. That's another bonus, sniper is designed to run modern fuel.
@@AcesGarage thanks! Yeah im over thinking it. I just have less than a 1000 miles on my rebuild and already looking at replacing my AVS2 when there’s nothing wrong with it 😂
@ArmyGreenFJ Been there, made that mistake. Lol.
Yeah enjoy what you got especially since it's already running and driving. Maybe throw a few bucks at another part of the build to satisfy the need to tinker.
good video. pretty sure you can just use an external map sensor to make more boost as long as you have a Super Sniper that has the additional inputs/outputs though.
Thanks for watching! All the sniper kits come with a built in map sensor integrated into the unit itself. What limits the horsepower level is the amount of fuel it can deliver. Some of the terminator set ups have an option of 8 100lbs injectors instead of the normal 4 100 lbs injectors that come in most of the other kits, and a diffrent map sensor capable of the higher boost levels.
@@AcesGarage so partially accurate. they have 8 injector snipers as well.. i have a 1250hp 8 injector super sniper on my car. super snipers have 2.5bar maps internal (regular snipers i think have 2 bar maps, but they can also technically use boost if you know what you're doing), but SS's can use an external map if you need to go higher. you can also swap out the injectors for bosch 210lb to make more power (scaling/tuning required obviously). you don't have to upgrade to a term x or HP unit though, although I'd recommend it if you're making those power levels.
Good info to know! I haven't seen the option for 8 injectors on a sniper set up but it makes sense that it would be an option. Going to have to look into the swapping of injectors on these units, that has peaked my curiosity. And I agree getting a term X is the way to go if your going to be getting into those HP ranges. Huge thanks for educating me more on it!!👍👍👍
@@AcesGarage yup, anytime man. checkout efisystempro. i think they sell the injectors. pretty sure installing them voids warranty, so may wanna wait till that's up to make the swap. but lots of people that go E85 move to the 210's since they need about 30% more fuel for that.
Definitely gonna check them out. My brother and I have future plans to build an E85 engine, not sure what we will put it in yet but it's definitely a build we are gonna do. 😁
You mentioned a big improvement in performance...can you elaborate? I just ordered a complete master kit plus Stealth distributor for my '66 Buick GS to replace the MSD/Edelbrock stuff in it now. It's a 455 Stage 2 car with aluminum heads big comp cam, roller rockers - you get the idea - running thru a TH400 w/Gear Vendors OD to a Ford 9" w/4:10 gears. Hoping for a big power jump with this system czcams.com/video/-U2oGuWzc70/video.html
Your Buick is awesome!! For my 68 Camaro it made a vast difference. The Camaro ran good before the swap, greatly improved throttle response. To be honest if I really spent the time I could have made the carburetor set up run pretty dang close to sniper set up. My power gain came from the sniper kit optimizing the tune. From my seat of the pants dyno I would say I gained 75 hp and close to 100 ft lbs torque. My timing ( before conversion) was set to a factory 327 with standard springs that come on a MSD so timing my was not optimized, and the carburetor was dumping fuel into the engine. Spark plugs was covered in carbon. If you know how to properly tune a carburetor set up sniper wont make anymore power really, but gives you the benefits of not having to constantly take apart the carburetor buying jets, power valves, springs to make it all work like a sniper, just put on once and your done. Plus the timing control really improves the drivability of the care which for me was a must because it is a street car. And if you decide to swap out your engine for a different displacement you don't have to retune your set up just swap it over to the new engine and your ready to go. Hope that helps!!
@@AcesGarage I appreciate the feed back. With a big motor/lopey cam, drivability is a big issue. I'm anxious to get this installed and set up. Nice Camaro. bought a brand new '67 with 327 and then a new '69 w/350. Had a '68 in there somewhere too LOL
Have you had any computer problems with it
Not a single problem it has been running great since day 1.
@@AcesGarage thanks for that. I've seen a few that have said because the computer is in the carby it stuffs up. Both sniper and fitech
Thanks again for your help
I’ve never had a problem with a carburetor. You either know your hot rod or you bought it
Its awesome that you know how to tune and build carb. But tons of people have no idea on how do that. EFI makes it so much easier to get more out of your motor than a carb does especially with a set up like Sniper. so how about this, what if your still learning how to work on cars? Getting your hands on a carb is easy, but finding someone to help teach you how to work on one and explain what each spring, or diaphragm, needle do is a lot harder nowadays. Since carbs haven't come factory on cars in over 40 years
Is this a reliable unit?
I have had no issues since I installed it. Very consistent start up time and drives the same everytime. Few other people I have meet who have had thier kits longer than me have had no issues either. Once it's set up correctly it's good to go.
I have the same system. If you believe the marketing and think this is a simple “5 wire” hook up, you are not going to find the Sniper or any other FI system reliable. If you are willing to update your electrical system as close to a modern car AND install it exactly as instructed, the Sniper is going to be reasonably reliable. At least as reliable as it’s non-oem quality sensors and hardware will be.
@@AcesGarage Hello, the guy that is restoration my 67 chevy was telling me about this conversion kit but I keep running across comments on CZcams about system failing after a few years. What's your experience or input on that?
@@clearedhot6146 I have had no issues and I have had it installed for 1 year now. My camaro gets driven pretty regularly. If you take the time to set up the kit correctly it should last you a long time with no problems. Im not saying there are never problems, even brand new cars have a few issues, holley has a great customer service line to help with any issues. But I find most people who have issues are trying to treat a sniper efi kit like a carburetor. Or make small easy to miss mistakes that can cause issues over time. Fuel injection is not new, we all use it everyday, even these kits have been out for years and the bugs have been worked out. My brother has been usuing a Fi-tech efi set up on his fox body mustang for years with no issues as well.
@@AcesGarage cool, thanks for the speedy reply
Great video. Iv had the sniper on my 94 chevy 1500 383 stroker for about three years. I couldn't get the tune right for most of that time.
The truck ran so rich your eyes would burn. Come to find out the holley is super sensitive to interference noise. My trans controller was making it go haywire. Once a holley tuner discovered that all has been great.
A sniper is a great set up.
Thanks for sharing! That's great info to know! I've heard a few people had similar issues, usually to close to alternator wiring thou, never with a trans controller. 383 stroker, good choice 👌.
sound up and down issues, makes it hard for me to listen and keep busy
better than 91 f150 fuel injection
You still have the #1 problem. Which is vapor lock at the intake and cylinder head. When you reach 180 to 190 at the intake and head your engine just stops. Really don't buy this. Only way to stop this vapor lock while driving and it vapor locks at the stop light is fuel injection at the head and intake. Why you think they only had TBI units for such small time.
I have experienced vapor lock before but never with my sniper set up. And I've been driving around Florida at 100+ degrees and stop and go traffic. Not saying it can't happen but you are the 1st person I have heard to say this. Not exactly sure what you mean about heat in the heads an intake? Vapor lock is caused by heated up fuel and usually occurs in a fuel line or a bowl of a carburetor. On a fuel injected set up there is no bowl and as long as the fuel lines are routed away from excess heat there is no problem. Other main source of heat is the fuel pump which an in tank pump is better than an external for heat control but really depends on your overall fuel pump set up.
I have the exact same system and my primary reason for installing the sniper was to eliminate fuel boil after shut of. The Sniper has eliminated that as well as any vapor lock as the entire system is pressurized with 55psi instead of 5 like your carb. Bottom line, there isn’t going to be any vapor lock with FI, throttle body or port.