EFI Systems based on Holley's world-class Dominator and HP ECU's. Upgrade the performance and efficiency of your carbureted engine with this (550-510) Holley Sniper EFI Self-Tuning Kit. The sniper master kits ship with OEM grade 255 LPH Walbro Pumps. O2 Sensor Mounting: The O2 needs to be mounted 6-8” after the merge in the header collector. 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. There is really no room for error on this. Incorrect connections will result in excessive resistance. Stufe I war es sie auf dem Test-Chevy Motor zu montieren um erste Eindrücke zu sammeln. Resistance results in heat and heat results in more resistance. Yes, there should be a steady flow of fuel out of the return. Can I use this for the return.Thanks for the help, Am i doing the right thing? Power glide with 1.80 first gear, 6,200 converter. :-), Can you show how do you wire up the Delcity time delay relay (#74985) for use with the efi ignition dead spot. Included clamp-on oxygen sensor kit ensures a leak free oxygen sensor installation, with Stainless Steel T-Bolt clamps and a Stainless Steel (Weldable) oxygen sensor flange. One of these is a ten-wire harness and the other is a seven wire harness. Oxygen sensors read unburnt Oxygen not Fuel. Simply pick your intake manifold flange type, power level, and aspiration type. The fuel pump should be powered by the heavy-gauge blue wire coming from the 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. Holley hasn't been very quick to fix the various Sniper issues and my guess is that the Terminator X would be more robust. The FiTech and Holley units enclose the injectors and mount the computer on the unit while the FAST keeps the injectors out in the open and remotely mounts the computer. Thanks, Chris! $1,871.95. Make sure the fuel pump is properly mounted and picking up fuel. They put an end to carburetor cold start issues, hesitations, vapor lock, and flooding. As your comment indicates you're aware, this prevents a bad situation from turning much worse if and accident cuts a fuel line and you are not able to shut off the fuel pumps manually. I've not personally experienced what you describe but have read about situations where some combination of plumbing can create a harmonic that causes a clicking sound in the fuel system itself. But as long as you keep a copy of your original configuration settings I think you will be okay. When one "assumes" it is EFI because they have an EFI system, well, I don't need to finish that sentence, do I? Thanks. Direct to the battery means to the battery. Not some generic pump as some have speculated. It is going on a 1966 coronet with 1964 413 wedge. Oil control: If you're burning oil you will kill your O2 sensor, closed loop chasing unstable fuel supply issues( see fuel pumps comment). Pin 85: To Ground 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. Beyond that you can turn your cranking fuel down. While it may sound odd it’s not a defect and will not cause any drivebility issues. Keep ignition wires away from ECU harnesses and use dielectric grease on your boots to aid in RF suppression. Sniper EFI: Modern Technology at an Affordable Price! If it cranks better then you know you're getting too much fuel. Chris has forgotten more about EFI than most EFI technicians will ever know. 3.) 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. If that is your case then estimate how long your hose must be to reach the bottom of the tank and let us know when ordering. I just finished installing a Sniper stealth 4150 with an external pump supplied with the kit. The Sniper EFI master kit contains the most complete EFI fuel system on the market. Hur du väljer ditt EFI-system. Several things to cover here. Boy, they didn't disappoint. Hard to answer. Sure. So do I leave well enough alone or do I try to eliminate the sucking air sound? The car is 31 years old with only 13 500 miles on it. That work continues today through Holley's market-leading EFI products as well as through Holley's family of best-in-industry brands. You do have a fuel pressure gauge, right? It seems to be going threw gas faster then it should. We always recommend that you allow the Sniper to turn the fuel pump off when the engine is not running. 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 resulting resistance can burn up fuel pumps, wiring and relays. This direct-fit Sniper EFI Kit offers a stealthy "carburetor" appearance plus the fuel economy, throttle response, and overall performance gains of EFI. Confession: My TPS is split and works well. Chris Myer is a tremendous resource for info and questions. Help for our customers is just a phone call, test message, or email away. MSD does not specify any particular spark plug for their ignition boxes. Run the switched 12-volt back as close to the ignition as possible. I highly recommend them to anyone deciding to go EFI. Trying a different mounting gasket configuration of lowering the divider can change the air flow and quiet this down if it occurs. 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. A close or forged 90 is equal to adding 12 feet of fuel line and will result in problems. Holley Squarebore 4150/4160; ... Standard Sniper EFI Features! But I have never heard of anyone else who has had success doing this. The challenge will be what you call the "right fuel system". Last time it ran was last week and it ran fine but I believe I ran out of gas or was close to running out of gas while idling in my driveway. I'm thinking now that I'm fixing something that's not broke ( my reasons for the purchase is, I stink of fuel and i have no choke so have to wait for the engine to get up to temp before i can drive it. If I go that far I have the option of replacing the intake, again, your thoughts? The fuel pump should turn off after 5 seconds until the motor is started. How will this setup work? One thing I miss is the instant drop in rpms that my 650DP had. ... 1 product rating - Holley Sniper EFI 550-527 4150 2x4 Dual Quad Fuel Injection Conversion Kit Shiny. Learn how to download and update your Sniper EFI software. Let me know what works for you! Bolt-on carburetor style EFI for your classic car or truck. Ran well on carb and electronic ignition. Granted, car was not on but still seemed like a lot of fuel to be returning. Eventually I might choose to have the ECU control timing, but I need to consider the Terminator-esque repercussions before going down that road. Have you ever watched a post nuclear apocalypse movie? Buy It Now. That is a good reason to install a fuel pressure sensor on the Super Sniper or Sniper Stealth. Find Holley Sniper 550-552 Holley Sniper EFI Autolite 1100 Fuel Injection Systems and get Free Shipping on Orders Over $99 at Summit Racing! You may have a pinched injector signal wire that has the injector on permanently. Well, the sniper 4150 has a dual drilled flange to physically bolt on to spreadbore applications where the stealth does not. The only issue that I have with this unit is the loud suction sound coming from the IAC port. 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! Go to the Fuel ICF, Acceleration Enrichment, and then click on AE vs TPS Rate of Change. Is this normal? Digital electronics like clean stable voltage. So you be the judge. Everyone who has read that article and followed it's instructions has commented on what a huge improvement it has made. Fast and Easy: How to Install a New Holley EFI Dual Sync Distributor, "Bad Bart" Tobener Enters the 7-Second Zone. I have the 12-1800 dual holley pump also. Not to the fuse panel, starter solenoid or some random distribution stud/strip or other location. Some good info here thank you. Is one barrel not spraying at all? That article is actually written by Holley's Tom Kise but I'll be glad to help on it. Any suggestions? Is the stock GM Powerglide transmission compatible with … At the bottom you'll see AE vs TPS RoC Blanking. Capability Range: Moderate Or do as I do? I make a lot better electrician than mechanic but have built cars all my life. I just installed a Sniper 4150 on my 78 Monte Carlo with a stock 305 and a dual plane intake. 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. If it dies or drops more than 50-75 RPM the throttle is closed too far. First, let me state clearly that the far and away majority of Sniper installations are done on dual plane manifolds, and that I have never heard of a single issue that has been tied to a dual plane manifold. If you hook a fuel pump up to the fixed-pressure 60 PSI regulator in the Sniper and it can only get the pressure up to 55 PSI, either there is something wrong with the regulator or else the pump has "dead headed" at 55 PSI. Be sure to watch the video embedded at the link above. That means at or above 55 PSI it is capable of flowing ZERO fuel. I’m getting ready to instal a sniper master kit on a Ford 4-hole spacers seem to work better than open spacers. 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. 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 guess it will work, but its gonna be a very expensive system X 3. It fired up, seemed to be learning and then POOF...puff out of carb and wouldn't restart. I figured it would be minimal. 10.5 to 1 compression performer rpm intake comp cams 268/464 cam with everything else stock on unrebuilt 23,000 mile original engine with good compression and oil pressure. I have two questions at this time: 1. 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. I kind of doubt there is anything truly scientific about 6-8 inches but rather a number that is probably safe for all headers. But as you go farther back, it only gets better. Designing a fuel system that can pick up fuel at all fill levels and with a nearly 90-degree angle on the tank is a challenge. If you have any exhaust leaks between the combustion chamber and 18-24” after the sensor you are going to have problems. 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. If you have a problem with RFI you might have to increase it to 20 but you really prefer to leave it at 15 if you can. A common issue we see is a result of poor fuel pump grounding running a eyelet from the pump ground to a rusty or painted surface. Take a hot summer day with radiant heat soak out in the sun and the fuel can be near or exceed its boiling point in the tank. Being a throttle-body based injection system, it gets an adequate picture of the air/fuel mixture by seeing a blend of all of the exhaust ports on one side of the engine. Your advice would be appreciated. I checked fuel lines to make sure I didn't reverse them. Most important!!! 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. Thanks. Sniper EFI gives you all the power and reliability of electronic fuel injection with none of the tuning issues commonly associated with carburetors. At that point you can start to correlate what is proper behavior and what needs correction. Good luck! Do as I Holley says? Integrated ECU means less wiring and ease of installation! Holley Sniper EFI FUEL INJECTION INSTALLATION MANUAL Read this manual before using this product. Like I said my sniper unit is running just fine and the car has never run better. ), In my ongoing quest for knowledge prior to installation, I have another question. Condition is "New". Find Holley 553-106 Holley EFI Digital Dash Gauges and get Free Shipping on Orders Over $99 at Summit Racing! Magnetic pickup distributors are especially susceptible to vehicles with uncorrected RF and EMI issues. But I have MSD 6 AL. That carb was often called the Pinto carb and was on a ton of 4 bangers back in the day. If you have long tube headers, mount the sensor approximately 6-10” after the collector. The Sniper ships with an OEM grade Bosch O2 sensor. Why? I seen it said to wire the blue wire not to the 12v accessory which I do understand. Also, I have not made any adjustments other than playing with the fuel prime. Don't hesitate to call, nights and weekends included.). How do you set this up?Thanks! This Mr. Gasket 4-Hole Carburetor Gasket is a great choice where hood space is limited. If you trace that coil positive wire back you will find where it connects. Can I run the pink ignition wire to the coil positive? 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. If that works then try halving them again. Never use the yellow wire if you're running a CD box like an MSD 6.The 1/4-inch line should not be used as a return. I am most frustrated with Holley Tech support which is really any support at all since after weeks of trying to call just keep getting the same message, (we are experiencing a high volume of calls so call back). Time left 4d 10h left. I am guessing you have some sort of current loop going on. This is a bit tricky. Holley’s screen can display information including RPM, water temperature, air/fuel ratio, fuel pressure and battery volts. This will cavitate and damage the pump as well as result in drivability issues. Fortunately, Holley has another product that can solve that: Hydramat.. Hydramat is not inexpensive but you won't believe what it can do. I swapped from a Edelbrock 750 and a Carter mechanical pump. I need to get an answer to the question concerning the TPS. 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.) to zero, but I think you'll find that you will stall. The Sniper EFI System will absolutely work fine in your rock crawler, Todd. Use of the I/O harness will also allow two ground switched outputs from the dash. Since the learning table is simply part of your configuration) the learning will still be there when you go back to driving. 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. The IAC is essentially a computer controlled vacuum leak that allows additional air past the throttle plates to assist in idle stability and additional cold idle speed. Mechanical Fuel Pressure Gauge There is certainly some conflicting information on O2 sensor installation. Hopefully it wont have all the bad bits pointing out the wrong way which so spoils the BBD Sniper as a Triple TBi system. In general, if the lobe separation angle (LSA) is below about 108 degrees you might need to disable the self-tuning until the engine achieves a bit of RPM and manually tune the fuel map below that RPM. We've partnered with Holley to offer their master kit along with our own Holley 350/500 to Weber mounting . 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? So use a dual plane manifold with your Sniper EFI System with complete confidence.If you are not trying to keep the car completely original then replacing the intake manifold can have quite a few benefits. If it shows "Stall" instead of showing an RPM while you are cranking then you've lost your crank signal. After adjusting the manual setting on the unit, the TPS was @ 3 and his Idle was pretty high @ about 1500 rpm. AutoTech EFi tend to hook its systems into a Holley HP multipoint computer like 67sixstang's. We offer two potential solutions. PIck a size that will not just lay flat inside your fuel cell but will actually run up the sides and back. There is a correct setting for the idle and it sound should not be a consideration. For over a century Holley has driven the cutting edge of fuel-system design. Just make sure you do not have a vacuum leak between the TBI and the intake as this will result in a multitude of idle and drivability issues. Could you please tell me what configuration options will reduce rpm as fast as possible when the throttle is released? Gary. If the instructions are not fully understood, installation should not be attempted. If the fuel pressure is a little low don't worry about that. Much appreciated! Put an end to cold start issues, hesitations, vapor lock, and flooding. Holley Sniper EFI for BBD Carbs. You just have to go one direction and see if things improve or not. Capability Range: Professional Or you could use one of their 4Bbl TBIs on a 4Bbl manifold, or one of their MPFI systems. 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. Enable a 1D table3. These full-featured throttle bodies are easy to install, can support a lot of horsepower, and will keep your budget intact. The Holley Sniper EFI master kit is the most complete EFI fuel system on the market because Holley provides you with everything to completely plumb your fuel system, including 20 feet of 3/8-inch EFI-rated hose, inline fuel pump, post and pre fuel filters, return bulkhead, and all of the necessary fittings and hardware. 6-8" would require me to install in my headers. EFI doesn't have feelings--it doesn't care what cam you use. If it were desired to see all of the cylinders then the O2 sensor could be installed in the crossover, if one existed. Available in base & master kits (Master kits include complete fuel system consisting of; 20ft of 3/8” Vapor Guard Fuel Hose, 12-920 Fuel Pump, Filters, necessary hardware and bulkhead fitting to return fuel into the tank!). Holley Sniper EFI Autolite 1100 fuel injection systems let you convert your classic Autolite 1100 carburetor to EFI. Put an end to cold start issues, hesitations, vapor lock, and flooding. In this video I install a Holley Super Sniper EFI system on my #FairmontProject. I am letting it set over night, cleaned plugs as well. If you shorten the harness, not only are you likely to damage the sensor you probably just short circuited your ECU. Your thoughts?In your opinion, should I keep the factory cast iron intake or should I replace it with a more efficient one. Clicking, ticking and sucking sounds. $999.95. Pressure holds steady at approximately 50 psig when engine is off. Supports up to 650hp with Four 100 Lb/Hr Injectors! Is a tremendous volume of fuel sprayed in all barrels? Buy It Now. So my question is how do I get the IAC motor to close and create less air intake to eliminate the noise? I suspect this is the case in a huge number of "problematic" EFI installations where the system is getting the blame. Capability Range: Advanced If you don't show any fuel pressure then fix that. I really would like to replace the intake gaskets. It was a bolt on replacement for the Opel Solex carb. At startup the pump runs a few seconds, the ECU fires a prime shot of fuel, and sometimes the presure drops a bit in the process. 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In Stufe II baute ich sie in den Mustang ein und erhielt erste Fahreindrücke. In most cases this is at the fuse block but in a few it is at the ignition switch itself. Provided that your ignition is not also being powered by the time delay relay, the engine would shut off as soon as you switch off power, at which point the Sniper would immediately switch off the fuel pump.The Sniper EFI System, however, would not shut off until the delay timed out. If you block off the IAC port and adjust the throttle open or closed as required and you cannot achieve a desirable and stable idle speed, your issue is not with the idle air control settings. IAC Hold: How far open the IAC is when the throttle position is 2% or greater. Holley Sniper EFI self-tuning fuel injection systems from Holley deliver all the benefits and none of the hassles. And 10 micron filter between the pump and throttle body. I have a 69 Camaro with a 350 V8 which has an Edelbrock 4 bbl. 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. So try cutting both of those numbers in half and see what happens. 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 like to have the idle area of the fuel map about 14:1, the cruise area about 14.5:1 and the WOT area about 13:1. Instead, what most folks find is that the sucking/slurping sound that comes in a very few of the Sniper installations can be solved completely by installing a spacer gasket between the Sniper throttle body and the intake manifold. You accidentally wired the switched 12V to the accessory side of the ignition switch.