The dash also offers a virtual switch panel, user-defined alarms, configurable shift lights, and can control on-screen playback of your EFI data logs. Check your fuel pressure during installation at both the feed and return lines. In a nutshell, you do the following:1. Brand New Holley Sniper EFI Self-Tuning Kit, Gold Ceramic Finish, Holley Sniper 2 Barrel Fuel Injection Conversion, plus Handheld Display (Part #550-851) Holley just brought EFI within range, introducing Sniper EFI 2300! I highly recommend them to anyone deciding to go EFI. Features and Benefits: - Classic Gold Finish - Designed to Deliver the Signature Rochester Roar at Wide Open Throttle - Throttle body Mounted ECU – no extra boxes to mount Brand New. To meet the needs of many enthusiasts, Holley’s Sniper EFI division introduces the new Sniper Stealth 4150, which is modeled after Holley’s successful Ultra XP carburetor. Try cranking immediately upon key-on--before it has a chance to prime. I can't find a good spot in the fuse block, I don't recommend this. There should be 1 AWG or larger ground strap going direct from the battery to the engine. All of these values are configurable. Don't be that guy. Stay after it--you'll make it happen! $9.99. I was wondering if you could help out? Most important!!! ), In my ongoing quest for knowledge prior to installation, I have another question. Joe. Hur du väljer ditt EFI-system. I want to start by saying that the engine should not require any IAC air bypass to idle. :-), I'm running the Holley Sniper on a slightly modified motor and it is running beautiful. This Mr. Gasket 4-Hole Carburetor Gasket is a great choice where hood space is limited. He gave no details, is this an option and how would one go about this. Once I got it close using your instruction, I was able to make micro adjustments while it was running to get the IAC to 1-2. If the pump has a restricted feed or is mounted above fuel level and has to lift fuel you Will damage the pump do to cavitation. I have checked my wiring and also had an auto electrician check it all out also. The Autolite Sniper EFI systems are packed with one 100 lb/hr fuel injector that will support up to 175 horsepower and a 2 bar MAP sensor that will handle 14.7 psi. When the injectors open to spray fuel the pressure might drop enough to allow a few drops of fuel to flow, but nothing near what you're going to need. Hi Chris,Thank you so much for your quick response to my query. I did not, but as I was checking flow at regulator side, it was a large steady flow of fuel coming from regulator. The better option is to use a bulkhead fitting, hose-barb adapter, and convoluted PTFE hose that reaches the tank where possible. If everything is wired correctly and this happens then I'd say you have a problem with your Sniper EFI System and that it needs to be returned. That work continues today through Holley’s market-leading EFI products as well as through Holley’s family of best-in-industry brands. Holley just brought EFI within range - introducing Sniper EFI! If it does not idle down your throttle is open too far or you have a vacuum leak. I want to run an under the carb type throttle stop. It’s economically priced so you can have all the benefits of EFI and still have money to finish or upgrade the rest of your ride! Whats the fix? Thanks. Today we passed a RIGOROUS emissions test with flying colors and my '79 CJ7 has never in its life ran as smoothly or with as much power as it does now. The Holley EFI Digital Dash measures 7.5" wide, 4.625" tall, and 1" deep which makes it a compact, customizable dash for use in a variety of motorsports applications. Not some generic piece as some have speculated. Features and Benefits: - Bolt on carburetor replacement - Throttle body mounted ECU (no extra boxes to mount) Otherwise, two sensors could theoretically provide some benefit but only if something were going wrong on the engine. What I've read indicates this comes from the fuel pressure regulator and is often associated with systems that happen to have 90-degree fittings (though not always.) Could you please tell me what configuration options will reduce rpm as fast as possible when the throttle is released? Unfortunately, the only way to do this is with the Sniper Software. Find Holley Sniper 550-552 Holley Sniper EFI Autolite 1100 Fuel Injection Systems and get Free Shipping on Orders Over $99 at Summit Racing! Is that an expectable by-product of adding this relay? Holley Sniper EFI Autolite 1100 fuel injection systems let you convert your classic Autolite 1100 carburetor to EFI. I really want to go EFI this year. Holley Sniper Stealth EFI FUEL INJECTION INSTALLATION MANUAL Read this manual before using this product. Chris, this is going to be an easy one. Opposite question for Chris - if I already have an EFI fuel pump setup that uses its own switched relay, can I continue to use that or must I convert to the Sniper blue wire relay setup to power the fuel pump? LCD Display Serves as a tuner and a digital gauge display, all at the palm of your hand. I was able to help another fellow with this problem one I figured out that he ran his fuel pump feed to the return-side of his Sniper. Upgrade the performance and efficiency of your carbureted engine with this (550-510) Holley Sniper EFI Self-Tuning Kit. By going with an aftermarket manifold you avoid that issue entirely.Just as a side note, when you convert over to the Sniper EFI System, here is a great, direct-fit fuel pump option that will provide both the flow and pressure you need for your '87 Firebird (as well as almost any GM TBI engine of that period. Thanks for your help system is working great!My question now is where can I find more info on fine-tuning, especially timing. Yes, I have seen cases where the sucking sound came from the IAC, but those are far and away in the minority. 1 Sniper Stealth 4500 (550-841 Shiny, 550-842 Black, & 550-843 Gold) Holley Sniper EFI FUEL INJECTION INSTALLATION MANUAL © 2021 Holley Performance Products. If you have RF and or EMI issues you need to correct them. :-D. Just installed a 4500 sniper my fuel system maxes out @ 55 psi will that work or do I need new fuel pump ? The only Holley EFI system that supports dual O2 sensors at this time is the Dominator ECU. Find Holley Sniper 550-552 Holley Sniper EFI Autolite 1100 Fuel Injection Systems and get Free Shipping on Orders Over $99 at Summit Racing! Your assistance would be greatly appreciated. Nor can I really recommend that you split it as I have. Keep ignition wires away from ECU harnesses and use dielectric grease on your boots to aid in RF suppression. Free ground shipping regardless of order size! Granted, car was not on but still seemed like a lot of fuel to be returning. Wiring the Ignition to Holley’s Sniper EFI System. Simply choose between Black and Dark Gray and designate your T-shirt size in the dropdown when adding the Sniper system to your shopping cart. I am running a wet exhaust with O2 sensor plates. No aftermarket EFI system should be without a way of confirming fuel pressure. The Sniper EFI master kit contains the most complete EFI fuel system on the market. Find Holley 553-106 Holley EFI Digital Dash Gauges and get Free Shipping on Orders Over $99 at Summit Racing! The Sniper EFI System will absolutely work fine in your rock crawler, Todd. Directly to the BATTERY!!! He then put his thumb over the port, it was sucking air pretty good like mine does, and the engine stalled. Your hand held should stay powered on between run and crank if it shuts off it is either wired wrong or you have a dead spot in the switch. I have two questions at this time: 1. Holley EFI Sniper 3.5" Touchscreen Mount Steering Wheel Terminator Dash 553-115. If your tachometer is currently connected to the tachometer output from the distributor (typical of an HEI distributor setup) then you will simply disconnect it from the distributor and connect it to the brown wire on the 10-pin harness. to the same number as 4.) Incorrect connections will result in excessive resistance. Price Point: $, Advanced throttle body injection systems capable of transmission control and more. Then, you'll be ready to bring EFI into range with Sniper EFI! You do have a fuel pressure gauge, right? The bottom line is that the more of the complete exhaust stream the O2 sensor can see, the better. Buy It Now. That work continues today through Holley's market-leading EFI products as well as through Holley's family of best-in-industry brands. If I go to ignition switch it is the same wire just 2’ away. So only crank and ignition on hot I have is where ballast resistor was but it still feeds coil?Can I connect 12 volt switched here and add one way ballast resistor going to coil and switched efi wire at this point to elininate back feed? Increase that to 15 to start. Is the sniper compatible with my distributor? How did you install the return line to the tank? If you have any exhaust leaks between the combustion chamber and 18-24” after the sensor you are going to have problems. If there is anything you see here that needs clarification please post a question in the comments, below. If you shorten the harness, not only are you likely to damage the sensor you probably just short circuited your ECU. My question is if both of my fuel pumps are wired from relays to my rocker panel where does the blue fuel pump prime wire connect or would you just not use it altogether. It’s economically priced so you can have all the benefits of EFI and still have money to finish or upgrade the rest of your ride! Extending wires with too small of a wire gauge will also result in the same damage. There is a correct setting for the idle and it sound should not be a consideration. And the less correction you do until you understand that---the better! It seems to be going threw gas faster then it should. I have a 69 Camaro with a 350 V8 which has an Edelbrock 4 bbl. This is why most OEM EFI pumps are in the tank. is setting themselves up for unnecessary frustration. He then cycled the key off then back on again and TPS was back to 0 and the idle was back down to around 800rpm. Hello, Robust, feature-rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps. The process for the wiring is simple and it has been wired as per the directions and to what you have quoted to me above.In order for me to return the Sniper, what would the process be? This instruction manual must be read and fully understood before beginning installation. Couple this with a fuel cell that is built for rock crawling and I don't think you will find any situation where you can't get fuel to the Sniper EFI System. Don't hesitate to call, nights and weekends included.). Look no further than Holley for the Super Sniper 4150 EFI systems featuring 8, 100LB/HR Fuel Injectors capable of supporting up to 1250 HP on forced induction or dry nitrous applications. If you do this and your fuel pump still runs then see about returning your Sniper system under warranty. Fits Holley part number: 553-115. This T-shirt is yours for $0.00 with your Holley Sniper EFI System purchased from EFI System Pro. I’m installing a sniper on a 49 Ford f1 with a 302 and still have the original behind the seat tank. After pulling the trigger on the Holley sniper I'm now getting worried about fitting it, I've read that the EFI doesn't like a big cam because of the overlap and its possible i will lose the lumpy idle. How do you set this up?Thanks! Depending on your application, this is also the time to install your throttle bracket and transmission kickdown brackets. O2 Sensor Mounting: The O2 needs to be mounted 6-8” after the merge in the header collector.Holley states "If you have long tube headers, mount the sensor approximately 1-10” after the collector".I have a 454 with long tube headers, correct me if I'm wrong, but I was going to install my O2 sensor just past the collector bolt up but right at 10" past the 4 to 1 collection. Supports up to 650hp with Four 100 Lb/Hr Injectors! I also took you through the basic installation and calibration of the system, enough to get it running properly before taking it … Capability Range: Professional Holley provides two options for ignition. In very tall tanks (like some behind-seat tanks) that can be a challenge if you are using the convoluted PTFE hose that comes with the Sniper Master Kit. Chris has forgotten more about EFI than most EFI technicians will ever know. i can hear the pump, but nothing is coming through the fuel line. Start by increasing your TPS and MAP ROC blanking values. FREE Sniper EFI T-shirt with every Sniper EFI system purchased from EFI System Pro! Pin 85: To Ground MSD recommends non resistor plugs. The car is 31 years old with only 13 500 miles on it. When you ask him a question you KNOW you're getting the right answer. Holley Sniper EFI FUEL INJECTION INSTALLATION MANUAL Read this manual before using this product. 60 watchers. Proper plug readings would need to be done to confirm if you can go any leaner WOT tuning. We offer two potential solutions. Self Learning Means you don't have to be a computer/tuning wiz to have EFI! AutoTech EFi tend to hook its systems into a Holley HP multipoint computer like 67sixstang's. Holley Performance Products has written this manual … If neither of these are the case then you'll need to go back to where you bought the system and ask them about returning the pump. Enjoy! Capability Range: Advanced If your goals exceed 175 horsepower or 14.7 psi, we recommend using an intake manifold with a different bolt pattern, such as the Holley 2300 2-barrel or Squarebore 4150/4160 and the corresponding Sniper EFI unit as well. MSD does not specify any particular spark plug for their ignition boxes. I still have the lound sucking air sound. Clicking, ticking and sucking sounds. These units offer superior throttle response and WOT power over the carb—and you will likely experience increased fuel economy. Your advice would be appreciated. Help for our customers is just a phone call, test message, or email away. Yes, there should be a steady flow of fuel out of the return. I have it disconnected to flush any debris out.Thank you. Many of these are completely normal with EFI. To start viewing messages, select the forum that you want to visit from the selection below. Power glide with 1.80 first gear, 6,200 converter. seems to be running rich at a idle. Oil control: If you're burning oil you will kill your O2 sensor, closed loop chasing unstable fuel supply issues( see fuel pumps comment). I really would like to replace the intake gaskets. Eventually I might choose to have the ECU control timing, but I need to consider the Terminator-esque repercussions before going down that road. Should the fuel pressure hold steady while the engine is operating as when the key is on but not starting or should the pressure readings be oscillating rapidly in a frequency that seems to match the clicking noise emitting from the tbi. The Sniper EFI broadcasts data channels to the Holley EFI 7” Digital Dash via CAN bus connection. Can I run the pink ignition wire to the coil positive? If not then stop and buy one now. Stufe I war es sie auf dem Test-Chevy Motor zu montieren um erste Eindrücke zu sammeln. How will this setup work? My car is going on the dyno for final tuning next week. It needs the tip pointed down at least 10 degrees from horizontal and at least 15 degrees from vertical I prefer about a 45 degree angle from horizontal. Fyi both fuel pump rocker switches have momentary primes. Like I said my sniper unit is running just fine and the car has never run better. Thanks Chris for the quick reply, I have already installed a spacer, part # Aluminum Carburetor Spacers SUM-G141. Only thing I have done since last Wednesday was add Holley EFI gauges. Adapting A Sniper EFI System To A Vintage Volkswagen, Putting The Sniper EFI Dual Plenum Intake To The Test On The Dyno, How To Install A Holley In-Tank Retro-Fit Fuel Module Kit Into Your OEM Fuel Tank, How to Make 900+ Horsepower with a Blow-Through Holley Super Sniper EFI, How to Replace your Mustang Autolite 1100 Carb with Holley Sniper EFI, How To Build A Custom Timing Table - Sniper EFI, How To Email Datalogs and Global Files for Holley EFI and Terminator X, Sniper EFI Initial Startup and Troubleshooting, Sniper Dual Plenum Fabricated Intake Manifolds for LS Engines. Get a gauge. Holley Sniper EFI is a perfect match for any muscle car, classic truck, street rod, or nearly any other carbureted vehicle. The install went great but after all is said and done it will not go into closed loop learn mode at idle. More or less how do I build a timing curve?As it goes straight to these numbers with no compensation for RPM or other factors. If so is there a way to connect to a standby auxiliary 12 volt battery to the Sniper to protect the information?Many thanks,Louis. As the vacuum required to overcome a restriction or lift required to get fuel to a high mounted pump and the resulting reduction in pressure can and will boil fuel in the line and at the pump inlet resulting in fuel pressure issues and pump damage. Fast shipping, great tech support. Pressure holds steady at approximately 50 psig when engine is off. 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You are on the right track!Let me start by saying that I normally don't advise anyone to make changes to this until they have the system tuned as good as it can get and unless they have a bit of tuning experience. Instead of buying another carburetor, I took advantage of the black friday sales and pulled the trigger on EFI. Holley’s screen can display information including RPM, water temperature, air/fuel ratio, fuel pressure and battery volts. Therefore what remote TPS can be used? #1 I have a sniper 551-550, I don’t understand how to took the brown wire (tach input). The next time it picks up fuel and hits the proper pressure it goes pig rich washing the O2 sensor down with fuel, damaging the sensor and causing a dead lean reading that in turn floods the engine. The engineering team also redesigned the water crossover passage to allow room for distributor phasing. Not long ago, I introduced you to Holley’s Sniper EFI 4150 Super Sniper EFI, a TBI-style fuel injection system that can support up to a whopping 1250 HP. Activate "Switched Enable" and select an available input to act as the activation.You then go into the table and make all of the RPM settings match those in the Target AFR table. Maybe I am missing something here. Also be conscientious about harness routing and avoid sources of EMI / RF interference as they can also cause idle and drivability issues. Set the X Axis to RPM5. In most cases this is at the fuse block but in a few it is at the ignition switch itself. Will the height of the return line be an issue? That work continues today through Holley’s market-leading EFI products as well as through Holley’s family of best-in-industry brands. Have you ever watched a post nuclear apocalypse movie? Hi, I have a 1987 Firebird with 305 engine and Quadrajet carb. Overall, I am very impressed with the Holley Sniper EFI system. Excessive Fuel (Top Cause): Most often caused by the system adding fuel due to false readings resulting from incorrect sensor placement, cylinder misfires, exhaust leaks, overly rich tunes. ... On to the O2 sensor. Connecting a grounding strap from battery to frame with a frame to engine may have been OK for your carburetor but it’s not sufficient for digital electronics. Be sure to watch the video embedded at the link above. Or do as I do? My setup requires too much pedal pressure both starting and running. It’s economically priced so you can have all the benefits of EFI and still have money to finish or upgrade the rest of your ride! Maybe we should have a discussion on here about the merits of the Terminator X over the Sniper? It will come back up when the engine is running.If you have fuel pressure then you've got to dig deeper. Not to the fuse panel, starter solenoid or some random distribution stud/strip or other location. We've partnered with Holley to offer their master kit along with our own Holley 350/500 to Weber mounting . From there it is a slam dunk. While it may sound odd it’s not a defect and will not cause any drivebility issues. Looking to convert your blow thru carbureted turbo engine to EFI? Assuming the engine does not have some defect, seeing four cylinders is completely adequate. Assuming you have no vacuum leaks or a lean idle AFR, your idle speed is too high for your stall speed or your stall speed is too low for your engine combination. Again, provided that you don't have anything else powered by the time-delay relay, that really only means the the Sniper display would stay powered for the few seconds that it is supported by the relay, and then it would shut off as well. Sniper EFI products are part of the Holley Performance family and offer economically priced self-tuning fuel injection systems. This manifold comes with a 95MM 1986-95 Ford 5. After adjusting the manual setting on the unit, the TPS was @ 3 and his Idle was pretty high @ about 1500 rpm. This is most easily done using the blue fuel pump wire. Learn how to download and update your Sniper EFI software. Free 3 day shipping Free 3 day shipping. Would love some feedback as what I need to do to help my issue. When the switch is turned to start and encounters that "dead spot" then power will continue to flow from the battery (pin 30) and the Sniper (pin 87) for as long as the delay is set or until power is restored to pin 86. RPM Above Idle to Re-Enable Idle Control.You could simply drop 2.) List price: Previous Price $1,099.95 9% off. But I suspect that's not the case here. This is a bit tricky. Sniper EFI: Modern Technology at an Affordable Price! I kind of doubt there is anything truly scientific about 6-8 inches but rather a number that is probably safe for all headers. I am also planning to get the Holley distributor and Sniper fuel tank. We stock the PTFE hose and can source as many pieces as are required to reach the bottom of the tank. ... 1 product rating - Holley Sniper EFI 550-527 4150 2x4 Dual Quad Fuel Injection Conversion Kit Shiny. Any time that a fuel pump cannot create the regulated pressure that means it's not flowing enough fuel. The Sniper instructions don't cover the use of these tables, but a dedicated user can read the instructions for a HP or Dominator EFI system to get up to speed. The stealth maintains most of the dimensions of the 4150XP carb. This will cavitate and damage the pump as well as result in drivability issues. That's not the case here is it? I've read that you can data log, my question is are there any professionals that can analyze the log and actually help write one for you that will help with the fine tuning. Holley Sniper 550-870 - Holley Sniper EFI Stealth 4150 Fuel Injection Systems Fuel Injection System, Stealth, 4150 Flange, Polished, up to 650 hp, 870 cfm, Four 100 … You must have at least 18” of exhaust pipe after the sensor. If you don't show any fuel pressure then fix that. Holley just brought EFI within range – introducing Sniper EFI master kits! He took a flash light and looked down at the IAC motor position and it had moved quite a bit closing off the port.Now I had to try this and of course my results were not so lucky. Capability Range: Advanced And 10 micron filter between the pump and throttle body. MAIN POWER AND GROUND need to go to the battery.