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O2 sensor placement is critical for getting your engine to read the oxygen in the exhaust correctly and can directly impact the performance of your new EFI installation. Holley EFI has the solutions you need to get your project up and running better than ever! *Possible delays due to Covid-19 click for more information. (probably with the edelbrock marine 2506 intake). (REGISTERED USERS DO NOT SEE THIS POST/AD! 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. Anybody got a good 270hp 350 tune yet?I installed sniper efi on my boat runs good but feel like the wot should be better need to get the sniper controlling spark is my thoughts the old thunderbolt is either not great or timing wasn't right when I bought the boat but she runs great I just think this engine has more in it then I'm getting out of it at this time any tuning and timing advice would be great considering I'm awesome with carb n hei diet but new to efi and boat timing curve but not an idiot so I say. Some of the landlubbers who are reading this may not realize that many inboard engines utilize what is called a wet exhaust, pushing the water from the engine block into the exhaust and then back into the lake/river/sea on which they float. The ones in the Bosch box come without warranty. 5. You have to one big hole in the riser, then you reach the cooling water, and one little hole in the next part of metal: now you reach the exhaust gasses. turn on the ignition.but do not start the engine. Features: . He also explains how to properly install them. Most water jacketed header manufacturers (Lightning, CMI, etc) will install 02 bungs in their headers for extra money. I bought a new holley sniper , dual sync dist., coil, and holley in tank fuel pump, When engine got hot it would go crazy. EFI is the wave of the future. It is the ratio between the mass of air and the mass of fuel in the air-fuel mix at any given moment. Replacement Bosch Wideband Oxygen sensor for Sniper EFI and Terminator X systems. Pay close attention to the instructions on O2 sensor placement. Look at the bottom.. the motor has the following mods, Aluminum heads, Performer intake, Sniper and MSD ignition module. 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. Part# 554-155. holley efi. It flows 850 cfm and can support up to 650 horsepower. Anyone ever converted a 1987 3.7L 4cyl Mercruiser engine to EFI. 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. Introducing Sniper EFI Master Kits, with a Returnless Retrofit Fuel Module. It should be pretty straight forward what each of these values do. Holley's self learning system is a blessing and a curse. 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. I recognize that it would be an absolutely tremendous investment, but based on the overwhelming response we get to this post I am pretty confident that the market is there. Then they had it repaired and back to me in 5 business days. One comes in the form of a Marine O2 Sensor Adapter from the folks at Howell EFI. Full time feedback from the sensor is what the computer uses to refine the fuel table. Top 10 Holley Sniper EFI Tech Tips Holley Technical Training Manager Tom Kise's top ten "suggestions" for Holley Sniper EFI System installation issues. See Details. This doesn't apply to race boats. . Q1. Welcome to Club Cobra! Holley Sniper EFI Wideband Oxygen Sensor Part Number: 510-554-155 Click image to zoom $125.99 More than 10 available Lowest Price Guarantee Sniper EFI Wideband Oxygen Sensor Replacement Part for Holley Sniper EFI and Terminator X Systems Bosch LSU 4.9 See more product details Free Shipping - Ships Today QTY Add To Cart Add to Wish List The Sniper needs a "clean" 12V wire that is hot in Start and Run. Most of you only need to tune 4 points, idling around the marina, part throttle - pulling the rope tight, 1/2-3/4 throttle - cruise, and YeeHaa - WOT. holley efi. Only a few hours on the motor but so far so good. Thanks for the heads up. AFR was 19 area. I'll let you know how it works out. I have searched thru the forum as much as I can, with not much luck. The spark must be manually tuned. For now I have a genuine bosch O2 and Standard Automotive TPS installed. Seems to have more low end tq and is much smoother power through out the rpm range. It may not be enough to cause problems with the way the engine runs aor even make into the cylinders, but it is enough of a mist to take out a O2 sensor. OT pipes may be out of the question, but with the water dumps put in at the transom, ala Gil or Rewarder OT pipes, you could get dry readings with bungs a little above where they bolt onto the logs, I would think. The latest is the new Holley Sniper EFI touted as a true bolt-on self-learning carb replacement. The bottom line is that trying to run EFI on a marine engine is not something you can do as an afterthought. 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. Price Point: $$, EFI Systems based on Holley's world-class Dominator and HP ECU's. After a few tries by jumping the starter solenoid I then realized the ignition key was in the off position. Good luck! The right side o2 was obviously reporting a fat 10.3 afr as a result, but the car still went 139mph, LOL. This runs in the area of $1000 and has everything you need for a basic install on almost any vehicle equipped with a four barrel carb. Sensors: Fitting: Threaded O2 . Add to Cart . Service Oxygen Sensor for Sniper EFI Systems, Service Oxygen Sensor for Terminator X Systems. replaced my original terminator x sensor that was mounted in an exhaust that took on some water and killed the original sensor. Or maybe I could just use a piece of spare/junk exhaust tubing, and bolt it to the manifolds and add a weldless O2 bung to it. The fuel module is self contained with water jacket cooling and contains the low and high pressure pumps. This is made by Innovate, the guy that runs the Holley EFI forum HIGHLY recomends AND uses them himself, I use them, my o2 on my wideband Innovate, kept going bad, a 4.2 Bosch o2, put this on both my Holley HP NTK sensor & the wide band, been 2 years now & lots of driving, all good, Heat-Sink Bung Extender (HBX-1) - P/N: 37290 The right side o2 was obviously reporting a fat 10.3 afr as a result, but the car still went 139mph, LOL. Bolt-on carburetor style EFI for your classic car or truck. Add to Cart . This really applies to any O2 sensor regardless of EFI system. . 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. Have engine apart and head checked and cleaned at machine shop. An O2 sensor is used when converting an engine to fuel injection and wanting to move from an "open loop" system to a "closed loop" system. I have not had it on the dyno with the sniper, but would guess probably about 400 to 410 hp and well over 500 tq.I did use the holley pump that came with the sniper. I'm having new headers with an O2 sensor bung installed in my car ('79 Vette) soon, to prepare for a Holley Sniper EFI TBI install this winter. What Is Pinion Offset, And How Does That Affect You? Emissions. In this video Holley's own Tom Kise explains oxygen sensors and where to place an 02 sensor bung in your exhaust. . While these base maps are generally quite good for cars they are going to be pretty far off in the case of marine applications. Can anyone share their experiences with this type of setup? Also some tips on preventing O2 sensor damage I didn't read all this, but yes, the EFI system can be run without a WBO2 sensor. Add To Cart. It will not fit on round or oval risers without a suitable flat area. Sniper EFI 4bbl Marine. Holley Sniper - Oxygen Sensor Location Thread starter GA Architect; . The adapter does require the removal of the manifold and some machining but it allows the O2 sensor to be placed into the exhaust flow but protects it from the water exiting the block. The Ford 2300 engine uses a Holley carburetor, but it is in fact a licensed copy of a 32/36 Weber. No worse than taking the reading in the intake manifold cross over. Menu. The basic kit comes with the TBI unit, touchscreen controller, water temperature sensor, a wideband oxygen sensor, and all the necessary wiring. . Here's the pic of the location with my header. Robust, feature-rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps. Wiring the Holley Sniper EFI system is equally easy. Capability Range: Moderate This step is only for those installing their Super Sniper EFI on top of a draw-through or Roots-style blower. 3. Specs. The new throttle response was significant,fuel saving and gave me a turn key cold start.Still I can't have an idle speed under load and a turn key warm start. Items 1 - 21 of 21 Items. Holley 554-100 NTK Wideband Oxygen Sensor. Let me know how I can be of assistance. 74 FJ40 confined to the swamp. In this case, the prime shot is good for cold, but too much for warm. Holley 2300 is their nomenclature for a 2-bbl generic fitment carburetor. Once the tune is complete, the O2 sensor can be defeated or . No prime, but a second later it's ready to crank 'normally'. HP comes from torque and rpm and rpm breaks things and increases wear. Part # HM206. Register now for free! Without Headers Steamers location (above) is perfect, up close to the engine where you have not lost much heat. Other than the constraints provided in the article above I see no reason why this wouldn't be a great upgrade. so far so good love the smooth power and easy starts. 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. Aug 17, 2013. 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. Attempted to make a parts run in my 1990 Third gen Chevy Camaro with a small block chevy 350 with flowmaster mufflers.I believed the issue in this video to b. Note that this is a different sensor than Holley uses for their Dominator/HP/Terminator/Avenger series. Have to replace head gasket. 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.) Holley EFI Oxygen Sensor. Please consult the Holley Sniper full manual and use this guide for supplemental clarification. I'm guessing by snail, that's another name for the riser? Then operate open loop with a fuel map\Timing curve.I am interested in the capabilities of the Sniper product (4 injector) in a Marine application.. I also capped off the regulated return line with a hose, clamps, and chamfering bit. Found out that it was due to rfi/emi. 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. Is this a good upgrade? If it's working to prolong the life of the sensor in the AEM Wideband kit then there is no reason to believe it wouldn't work with any other sensor. For the most part each engine wants a bit of its own timing set-up IMHO, you boat owners with a 270HP 350 (or any other config) may want 350HP but upgrading it to that level will reduce or eliminate reliability. Looking for some advice pertaining to Holley Sniper and Tire Size upgrades. Holley Sniper EFI Oxygen Sensors 554-155 If there's anyone willing to read a bit and offer advice about what to do when doing a top-end swap (when you may be in a scenario with a new top-end that's the EFI isn't calibrated for AND you can't have an WBO2 sensor connected), please let me know. Restore or update your Holley Sniper EFI System with this WBO2 Sensor 17025 Bosch 554-155 Holley. I am considering the Daytona Sensors Ignition module. Are you running the latest software? You are using an out of date browser. You will still get some water on the engine side of the snails, mainly at low Rs. *Free Shipping & Handling only offered to the contiguous US on orders over $100, excludes clearance parts and oversized packages. . . Did you use the Holley fuel pump and have you had any issues with it? YES! Thanks guys. . pull the sensor out of the exhaust. But you've found the right one for your Holley Sniper EFI System OR your Terminator X EFI System. What I don't want to do is spend more money on the headers than on the fuel injection upgrade and new propeller set. CUSTOM ART FOR CUSTOM NEEDS. Sorry for the late reply. I have also picked up another .5 gallons per hr to about 9.25 gph. So I bought the progressive linkage but you then have . May 1, 2018 They want you to angle it to keep it from fouling. (Assuming it actually releases in November and there are enough units for me to purchase and receive one in December). It could be an instant fix. RPM going up and down , miss firing and backfiring. I installed a holley sniper kit. There are drawbacks to that (as your tuner can explain in more detail) but it is doable, provided the system is correctly tuned initially. Im almost at your exact same setup on a Redline 460/Berkeley pump but waiting to pull the trigger on the Sniper until I can pinpoint exactly where I can install the o2 sensor without the wet exhaust damaging it. Waiting for spring to put back together. I installed it without O2 sensor, adjust on the fly. I recently installed the sniper setup on my stock 71 duster 340 4 speed. When buying the Holley Sniper EFI kit, you've got two basic options. Holley Sniper EFI Self-Tuning Kit - Shiny Finish, Holley Sniper EFI Self-Tuning Kit - Black Ceramic Finish, Holley Sniper EFI Self-Tuning Kit - Classic Gold Finish, Holley Sniper EFI 2300 Self-Tuning Kit - Shiny Finish, Holley Sniper EFI 2300 Self-Tuning Kit - Black Ceramic Finish, Holley Sniper EFI 2300 Self-Tuning Kit - Classic Gold Finish. I want to register an account for free right now! I just installed a Sniper on a 67 GTO and it was pretty straightforward, the end result was a much better starting/smother running car, than can adapt to elevation changes better, But we also installed the Holley Dual sync distributor for a complete system that adjusts timing as well. For a better experience, please enable JavaScript in your browser before proceeding. I will keep the in-line pump for a spare. Now the lower cost Holley Sniper advertised for March 31 2016. I know from some of the other posts, there have been WBO2 sensor issues. If you have a manual tranny starting off without squealing the tires can be tricky because all four barrels open up at the same time. I had a blue wire coming out of the firewall that met this need, but it was already hooked-up to the + side of the coil and the Duraspark box. Option 1 is to purchase and install one of the Holley EFI Dual-Sync Distributors on your engine. I've installed several of these adaptive EFI's on cars with great success. Followed all the instructions to the letter. My first install was on a stock manifold and I installed it in about the same spot Steamer (above) did, except 180 degrees the other way, facing towards the front of the vehicle. Will I be able to control my ignition timing with the Sniper? By Joshua C on August 10, 2021 | Verified Owner, Worked right out of the box. It just means that if you are thinking you'll install this, crank it, and pull away from the dock with complete success you might be in for some disappointment. In Stock. Find a lower price anywhere and we'll beat it by 5%! Sniper EFI Quadrajet Marine. My boat is still in winter storage. OP, the Edelbrock system looks to use the same basic sensors as the Holley sniper system: TPS, MAP and O2, plus a few supporting sensors. One workaround was to leave it in gear and slow to a stop and push the clutch as RPMs drop . Find a lower price anywhere and we'll beat it by 5%! Homemade body parts replace the originals as they rot away but it's a 40 on the inside. Seems to LEARN much faster than the Fitech did. (Image/Wayne Scraba) The throttle body is a bolt-on replacement for a carburetor. Purely coincidence about the '2300' number. It doesn't even mean that you can't do it. Holley Sniper O2 sensor replacement. Stock manifolds? Depending on how fast you want one, there are plenty out there: The Cross ref numbers on the Holley forums and the Net is a Bosch 17025. The truck started fine after install, and ran down the road ok. functioning controller during engine operation. It does not work with the Sniper EFI oxygen sensor. Add to Cart . I have searched thru the forum as much as I can, with not much luck. Taking a look at the holley manual I am thinking about drilling and tapping the front exhaust port on the log for the O2 sensor. I thought the clamp on style mount was a good idea in case the threads got buggered up when a sensor change might occur, and the threads are rusted up by then. It's fast, simple and absolutely free. Held finger over IAC and it ran better, the thing was just wide open all the time and had nothing to suck. I would back-burner the ignition control questions until you get the fuel injection working. $5 Off Your $100 Mobile App Purchase . Make sure to put anti seize on the threads. Good luck to all. Will I be able to run both systems off of one fuel pump? Holley EFI Usb/Can Harness, Sniper Tbi. You'll also notice that the firing order is 1-6-5-4-3-2. I will be calling around to see if I can find someone to help that has experience. I have a local customer with a pair of big blocks in his offshore boat that is eager to get started on this. May God's grace bless you in the Lord Jesus Christ. - Do you know of a Carburetor Builder who has addressed the Coast Guard certification issues with the Sniper EFI? - You are currently viewing the forums as a GUEST. Top 10 Holley Sniper EFI Tech Tips Holley Technical Training Manager Tom Kise's top ten "suggestions" for Holley Sniper EFI System installation issues. (Image/Wayne Scraba) The throttle body is a bolt-on replacement for a carburetor. non biased Shelby Cobra related site! The fuel lines and fittings are 3/8s with 8AN fittings and everything on the 60 requires 5/16 fuel line with 6AN fittings) Holley Sniper EFI 550-849 Holley Sniper EFI 2300 Self-Tuning Kit - Shiny Finish.