Using the throttle body's fuel pressure regulator will require a 5/16" fuel return line to the tank. . Pay close attention to the instructions on O2 sensor placement. Thanks for that, Danny. Thinking about this I think this will work very fine! It should be pretty straight forward what each of these values do. Copyright 2022 Holley Performance Products, Inc. All right reserved. No, use only one 02 sensor, mounted close to exhaust manifold, or high up on a Header collector, not into a single Header pipe that merely gets a exhaust pulsation. I will let you know what happens. If this could be disabled it would be much better. This is great information that can only get you closer to an ideal solution. Holley part number 554-155. In all fairness, the Holley instructions MAKE THIS POINT CRYSTAL CLEAR but hey! JavaScript is disabled. Are you running the entire system? Did a test startup on my new sniper by running the power wire to battery + and not using the o2 sensor.I also capped off the regulated return line with a hos. Part# 554-155. holley efi. I had an o2 sensor fail on a pass yesterday, and flatline at 11.5afr. Thanks for the heads up. However, advanced tuning software is available for the Sniper EFI System that allow them to be tuned by a competent professional with experience tuning marine applications. JavaScript is disabled. The adapter will be fastened in both metal parts so that no water will reach the O2 sensor. Replacement Bosch Wideband Oxygen sensor for Sniper EFI and Terminator X systems. For complete information about the cookies we use, data we collect and how we process them, please check our, actual instructions in flowcharting are represented in, Why Is Dave Blankenship Not On Oak Island Season 8, rhode island groundwater classification map. I'm using the NTK sensor. Let me know how I can be of assistance. According to AEM Electronics, a leading manufacturer of aftermarket Wideband O2 sensor kits, the following may damage or destroy oxygen sensors: Additionally, if an Sniper or Terminator X EFI System has repeated O2 sensor failures and none of the above-listed suggestions seem likely then contact Holley and arrange to have the unit tested. I recently installed the sniper setup on my stock 71 duster 340 4 speed. Price Point: $, Advanced throttle body injection systems capable of transmission control and more. Sniper EFI 4500 Marine. The oxygen sensor should be mounted at a point where it can read a good average of all the cylinders on one bank. Aftermarket headers are pretty much the only safe way to run an O2 sensor. *Free Shipping & Handling only offered to the contiguous US on orders over $100, excludes clearance parts and oversized packages. But for just over $10 and two simple configuration changes you can switch to a progressive linkage that opens only the two primary barrels at first and then brings in the secondary barrels at a later point. From there, the idea is that it will self-tune to the requirements of the engine. 2 Reviews. We may earn a small commission from affiliate links and paid advertisements. 74 FJ40 confined to the swamp. Have to replace head gasket. Yes, this is an old thread, but it's an old unit. The very front would be the safest place. Part # 554-155. Sensors that are installed in an exhaust must be connected to a properly Thanks for the compliment--we look forward to your feedback! Then having an experienced tech from a local dyno speed shop ride in the boat as you run the power up and down, making notes. 02 sensors are very heat sensitive, and can detect an exhaust pulsation in a single Header tube, that's why we always wanted to position the sensor into at least 2 opposite firing tubes we running Headers. $102.95. Please consult the Holley Sniper full manual and use this guide for supplemental clarification. but I'm finding when running engines with holley sniper kits the the engines are very eratic ,the air fuel numbers are always changing drastically from one pull to . Seemed to be getting too much fuel on hot starts and flooding out, could get it to go by putting it to the floor while cranking as Action mentioned. My tune is coincidentally set at 11.5 desired afr, with the failed side as the leanest bank, but the ecu added 15% fuel anyways. Add To Cart. Capability Range: Professional JavaScript is disabled. I'm about to embark on the same type of project. EFI EFI kit electronic fuel injection. I hope that the next F/2F header is more O2 sensor friendly. Powering the Sniper, There are three wires that need to be connected to power on the Sniper, Red and Black main power wires, these need to be run directly to the battery and have a solid connection. The World's largest It could be an instant fix. I put mine after the collector only because I have a new exhaust and muffler going in and Ill use a weld in bung and placement will be different. Everyone raving about customer service is telling the truth! It does this every time..when you start a warmed up engine, its too rich and starts poorly without throttle. All I can say is it made a completely different motor out of the 460, 39 degrees out and starts within 2 revolutions power is super smooth throughout the rpm range (idle to 4100rpms 212 Hamilton with 4.0 turbo impeller) has about 6 hrs of learn time. The Sniper will do that. Running? Yes, this is going to be an added expense, however, it will help guarantee your success. I have searched thru the forum as much as I can, with not much luck. The Ford 2300 engine uses a Holley carburetor, but it is in fact a licensed copy of a 32/36 Weber. Was in marine engineering for years. I will change and be using an in-tank pump when I install the new 120 gallon tank this winter. I'll let you know how it works out. Initially I was looking for the upgrade to a 4V holley 4175 carb, but this option has peaked my interest. Sent unit back to Holley. so far so good love the smooth power and easy starts. George Place the Sniper EFI throttle body on top of the new flange gasket on the manifold. Innovate Motorsports HBX-1 Bung Extender. It appears that its a tuning issue. While these base maps are generally quite good for cars they are going to be pretty far off in the case of marine applications. Mike. Holley recommends a 3/8" fuel supply line. It flows 850 cfm and can support up to 650 horsepower. I will keep the replacements as spares. This completes the basic installation of the Holley Sniper EFI 4150 Super Sniper 1250/650 kit. Found out that it was due to rfi/emi. On a side note: Im getting 4200 rpms at 5000 elevation with stock heads. 29. 2. Without Headers Steamers location (above) is perfect, up close to the engine where you have not lost much heat. PRO's: Wideband O2 sensor harness is longer, allowing easier connection and routing. In order to do this, it heavily relies on proper O2 sensor placement. The throttle body has a built in fuel pressure regulator set at 58.5 psi. The basic kit comes with the TBI unit, touchscreen controller, water temperature sensor, a wideband oxygen sensor, and all the necessary wiring. (If I am incorrect I heartily invite your comment at the bottom of this article!) Holley EFI Usb/Can Harness, Sniper Tbi. Option 1 is to purchase and install one of the Holley EFI Dual-Sync Distributors on your engine. Vega$69. You really want a bigger engine. There is no problem getting this tuned and then running open loop. Hi all, i'm contemplating doing a sniper quadrajet swap onto my volvo penta 5.7 GL 2bbl holley motor in my 1997 cobalt 200 with the DP-S outdrive. If you have long tube headers, mount the sensor approximately 6-10" after the collector. Greatest struggle is the shift interrupt. Fuel prices at the marina are usually about a dollar a gallon more than at the local Racetrac/Wawa/wherever, and even more if you wisely opt for ethanol-free fuel. Do you offer a USCG fuel pump kit? I will keep the in-line pump for a spare. Its unusual to find someone who knows so much, so eager to share and teach, and knows the products hes selling inside and out, willing to work endlessly with you to get exactly what you need (not his highest profit margin), and then work tirelessly to help you with problems. The problem is with the Holley computer when you turn on the keyit squirts a prime for a split second. p.s. This combines the Sniper EFI Self Learning Throttle Body, with an easy to install In-Tank Retrofit Returnless Module, 20 ft of Earl's Vapor Guard Fuel Hose, and the required fittings. 2023 Holley Performance Products, Inc. All Rights Reserved. On my system, I machined in the O2 sensor right between the snail and the manifold of a . I only have a stick welder and didn't trust myself on the thin pipe so I brazed it in. Maybe going all the way to the front is the way to go? Went with around .525 lift, 270 duration on a 114 LSA and the car was sucking vacuum like a new hoover. Then if you are do you just wire the o2 sensors in parallel or do these EFI kits have inputs for more than one sensor. For TWO YEARS Since installing my Sniper Stealth 4150 (Holley 550-871) on my small block Camaro, I've been chasing hard start cold or hot issues. 5. They have mods that help. Has been since the 80's. Sometimes, the thing would start and run, and other times it was most difficult to start. All sensors are tested to ensure they accurately report critical engine data to the . I stopped by Bergeron on my way back to the lake, and he said they have never found a good way to run O2 sensors in a marine exhaust. Similarly, no multi-point fuel injection (MPFI) systems existed that were USCG approved. Held finger over IAC and it ran better, the thing was just wide open all the time and had nothing to suck. These types of adjustable on-delay timer relays are on sites like Amazon for less than $10 up to $15. QFI-500 Oxygen Sensor. The latest is the new Holley Sniper EFI touted as a true bolt-on self-learning carb replacement. This product works with Holley EFI wideband oxygen sensors, part numbers 554-100 and 554-101. I have not gone back in to try to fine tune them. Description. Look at the bottom.. Any word on this? functioning controller during engine operation. No worse than taking the reading in the intake manifold cross over. Here is one on start up tuning. Taipei has dozens of world-class restaurants where gourmets can sample the most authentic Chinese cuisines. Sensors that are installed in an exhaust must be connected to a properly functioning controller during engine operation Additionally, if an Sniper or Terminator X EFI System has repeated O2 sensor failures and none of the above-listed suggestions seem likely then contact Holley and arrange to have the unit tested. Now the lower cost Holley Sniper advertised for March 31 2016. Removed all the unused wires from harness and wrapped all the remaining wires and harness with rfi shielding tape. May God's grace bless you in the Lord Jesus Christ. Categories. Holley EFI. He had one there that was run on a dyno then the fuel map was set and shipped back. All of the wiring begins at the throttle body and connects outward from there. Add to Cart . The test run was great, they have never run so well even when they were new with carbs. View Holley Sniper EFI Self-Tuning Kit - Shiny Finish. This really applies to any O2 sensor regardless of EFI system. The truck started fine after install, and ran down the road ok. After some time, the truck will not start after it comes to operating temperature. To close this one out, below is a photo of where I installed the O2 bung. You shouldn't feel too bad about that lack of knowledge, because many boat owners either don't realize that the moisture present in their wet exhaust manifold will kill the wideband O2 sensor required by an EFI system. Also the progressive link. Why? I have tried several different settings to get it going, no luck. Part# 554-155. Sniper EFI Releases new Stealth 4150 Models! Let him re-jet the carb (a wee bit on the fat side for safety) and reset the timing and try again. "Old Yeller" gets Holley EFI Sniper O2 Sensor Installedhttps://www.holley.com/products/fuel_systems/fuel_injection/sniper_efi/sniper_efi_stealth_4150/sniper_. I will be starting mine up this month, I hope it goes well, good luck to you. Replacement Sniper and Terminator X O2 Sensor. I think I could run more boost but it's a real hand full right now. Maybe my manifolds leaked the inside between the snail and the log?? i thought about it, but after $3400 on an EFI alone and an entirely new rigged boat Im having a hard time forking out another 2000 for an exhaust when I may just do an open loop My buddy machined up a set of spacers I sketched out for him. Anything else is going to be a frustrating recipe for for failure. #3. away. Oxygen (O2) Sensor - Is an electronic device that measures the proportion of oxygen (O2) in the exhaust gas. Emissions. Hello Chris,Ontario's boating season is about to launch for another year.Do you have any good news to add to your above article, any new marine friendly TBI products?In '08,I installed a Holley 21-700 TBI with the o2 mounted in the manifold to Holly specs. Did you use the Holley fuel pump and have you had any issues with it? THen you have to determine if you want 02 readings from one cylinder, or in the case you just mentioned mostly one cylinder, average of 4 cylinders on one bank or the other, or average of all 8 cylinders. Visit their website for more details. Brass adaptor designed to install heated oxygen sensor in water-cooled marine exhaust risers. Supports up to 650hp with Four 100 Lb/Hr Injectors! I do believe that the Holley EFI ECU's have the capability to be programmed to work in this application, but have not yet found anyone who has tackled this task and been fully successful.If you (or anyone else) does make some progress on this, please reply here and let us know what works. I have about 30 hrs on the unit and it just keeps getting smoother with every hr of run time. When I went to Holley HP, I found an adapter by Innovate that is designed to draw air out the exhaust stream and away to the O2 sensor. Holley Sniper EFI Wideband Oxygen Sensor. Even if you are the sort to sort of shrug off safety regulation, consider that if there is an accident that results in a loss and an investigation, failure to follow applicable USCG regulation could result in either financial or legal liability, not to mention the rejection of insurance claims. Given the traditionally poor fuel economy of carbureted marine engines, we feel your pain. Q1. (Assuming it actually releases in November and there are enough units for me to purchase and receive one in December). Yes! Sniper throttle body linkage opens all four barrels evenly when you depress the throttle. looking at doing the same. Never tried it myself or know anyone fwho has, but Little kids play hooky . big kids play. HP comes from torque and rpm and rpm breaks things and increases wear. Sponsored Links (REGISTERED USERS DO NOT SEE THIS POST/AD! The truck started fine after install, and ran down the road ok. Followed all the instructions to the letter. $132.95. Holley Sniper Installation Supplement Please note, a Holley Sniper instruction manual, as well as some small parts that come with the . I had an injector fail after a month of running and called the tech line who helped me figure that out. #1. Part# 50-5009QFT. I installed a holley sniper kit. If you let it cool down again, does it start up fine? Sort. I have a boat with twin 3.7 Mercruisers. Previously, none of Holley's throttle body injection (TBI) systems, such as the Terminator EFI were USCG approved (even though the HP and Dominaor ECU's themselves are.) You will need an O2 sensor to measure fuel needs, but it could be tuned manually like in the old days.