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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. so far so good love the smooth power and easy starts. 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. Stay up to date with the latest releases, events, promotions and more. Replacement Bosch Wideband Oxygen sensor for Sniper EFI and Terminator X systems. Installed the sniper/MSD combo on my mildly built 460 KEM. 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. In a horizontal or if pointed upwards it can collect exhaust condensation liquids upon start up. When the Sniper EFI System received USCG approval at the end of 2018 this presented some hope for boat owners. He had one there that was run on a dyno then the fuel map was set and shipped back. Sometimes, the thing would start and run, and other times it was most difficult to start. Running? To close this one out, below is a photo of where I installed the O2 bung. For gourmands, night markets not only offer scrumptious small . From there, the idea is that it will self-tune to the requirements of the engine. However, overcoming that whole idle/off-idle transition (mentioned above) is going to be the challenge. For a better experience, please enable JavaScript in your browser before proceeding. There can be leftover debris from manufacturing that have been washed down and are now clogging one. quick fuel. 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. The target A/F value based on load or MAF cfm, and engine speed. Good luck to all. Thanks for the feedback on this adapter, Donald. May 19, 2021. Add to Cart . Ive got a set of bassett headers for a BBC, ill see if they can fit under the transom. Howell indicates that this adapter was designed for the Chevy type Mercruiser manifold but that it should work on any similar marine wet manifold. The oxygen sensor should be mounted at a point where it can read a good average of all the cylinders on one bank. Maybe my manifolds leaked the inside between the snail and the log?? To simplify . Right now I'm just using the AEM Wideband sensor to monitor Air/Fuel ratio but hope to use it in an EFI system soon. *Free Shipping & Handling only offered to the contiguous US on orders over $100, excludes clearance parts and oversized packages. turn on the ignition.but do not start the engine. You'll also notice that the firing order is 1-6-5-4-3-2. $108.95. The Holley Sniper system sells for $999.95, installs in under 2 hours, and requires only an O2 sensor, a temp sensor (both included), an electric return-style fuel pump, and four-wires to connect.. Quote Reply Topic: Holley Sniper Posted: Jan/05/2022 at 2:01pm . Part Number: 510-554-155. The Tech Tips and discussions are also great! "Old Yeller" gets Holley EFI Sniper O2 Sensor Installedhttps://www.holley.com/products/fuel_systems/fuel_injection/sniper_efi/sniper_efi_stealth_4150/sniper_. It is the ratio between the mass of air and the mass of fuel in the air-fuel mix at any given moment. HP comes from torque and rpm and rpm breaks things and increases wear. They are about 4 inches long, in-line between the log and manifold. The reason I say this is that nowhere in this discussion is the fact that none of these systems are are handling the timing on the fly. You need to intimately know the system you are using, its capabilities and limitations, install it correctly and have it tuned with someone with experience specific to marine applications. It will not fit on round or oval risers without a suitable flat area. Restore | Make | Philosophize | Eat | Drink | Be Happy | Let's Go Brandon! They have mods that help. After a few tries by jumping the starter solenoid I then realized the ignition key was in the off position. I did--- Save your money and piece a fuel it together. Sensors: Fitting: Threaded O2 . It's hallmark is its simplicity--but in this case it is also it's shortcoming. 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. Sniper EFI 4bbl Marine. Other? All times are GMT-6. 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. We may earn a small commission from affiliate links and paid advertisements. Anyone have a good place to find a genuine Bosch O2 replacement sensor without paying $110? Holley EFI has the solutions you need to get your project up and running better than ever! i'm not aware of a universal aftermarket EFI fuel pump kit that is USCG approved. 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. The problem is with the Holley computer when you turn on the keyit squirts a prime for a split second. I took my time soldered every wire connection and routed all the wires carefully to avoid any emt issues. When buying the Holley Sniper EFI kit, you've got two basic options. That is defacto step one in trouble shooting fuel injection systems. This Video Shows Ideal O2 Sensor Placement! Free Shipping - Holley Sniper EFI Oxygen Sensors with qualifying orders of $99. I am looking for a TBI with full sensors, mainly atmospheric for Sept and Oct and a Idle Air sensor for warm starts.I welcome your thoughts.Regards, Are you running the entire system? Add To Cart. Please consult the Holley Sniper full manual and use this guide for supplemental clarification. I will be starting mine up this month, I hope it goes well, good luck to you. Prime cannot be adjusted on this old unit. functioning controller during engine operation. Essentially, when I push the clutch in and ease on the brakes to coast up to a stop light, the AFR goes lean (18:1 or so) and the engine stalls. I have also picked up another .5 gallons per hr to about 9.25 gph. Sensors that are installed in an exhaust must be connected to a properly A replacement clamp on would be an easy change out. 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. Oops, after that it cranked right up.Idle was set to 950rpm so after the vid was cut off I lowered it to 820rpm and it was purring like a kitten.EFI for dummies. 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 have tried several different settings to get it going, no luck. 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. All of the wiring exits below the rear fuel injector cover, for a completely stealth installation. The wide band O2 sensor is required for initial running and calibration. Most of Holley's EFI systems provide a Setup Wizard that builds a base configuration file that allows you to start the engine and operate the vehicle. Is this a viable upgrade for my boat? I know from some of the other posts, there have been WBO2 sensor issues. I will change and be using an in-tank pump when I install the new 120 gallon tank this winter. I had an injector fail after a month of running and called the tech line who helped me figure that out. But you still risk a little water running back at low Rs. I will be calling around to see if I can find someone to help that has experience. I have a 74 bronco, 302, mild cam. Fuel economy went from 12.5 to 13.5 gph to 10 gph. A forum community dedicated to performance boat owners and enthusiasts. 92 YJ 4.0, AX-15 5spd, np231, dana 30 front, dana 35 rear. On my system, I machined in the O2 sensor right between the snail and the manifold of a . $119.95. But you have to get it tuned. Is this a good upgrade? replaced my original terminator x sensor that was mounted in an exhaust that took on some water and killed the original sensor. Who knows. PRO's: Wideband O2 sensor harness is longer, allowing easier connection and routing. Sponsored Links (REGISTERED USERS DO NOT SEE THIS POST/AD! I want to register an account for free right now! You must log in or register to reply here. I am happy with Holleys no hassle replacement of the parts. Phil is right. I found this in the instruction manual for the older commander 950 system. I recommend popping for the Master . 100% identical. Sent unit back to Holley. You can selectively provide your consent below to allow such third party embeds. Wiring the Holley Sniper EFI system is equally easy. Price Point: $$$. Does an yone have a pic of the O2 sensor in their exhaust? The in tank pump is quieter, will normally run cooler and should last longer. With the sniper as long as you locate the o2 sensor where it gets good feedback and stays dry long enough to get a good tune you could lock it so even if the o2s get wet it still runs good. ), https://www.ebay.com/sch/i.html?_froensor&_sacat=0, https://www.amazon.com/Bosch-Automot1296929&sr=8-3, https://www.efisystempro.com/wbo2-seer-tbi-554-155, https://forums.holley.com/showthread2927#post82927. Dec 28, 2016. Brand: Holley EFI Emission Code: 4 . Everyone else was backordered several months. Each engine has the Holley marine 2 barrel carburetor. Also some tips on preventing O2 sensor damage One comes in the form of a Marine O2 Sensor Adapter from the folks at Howell EFI. http://s621.photobucket.com/albums/tt291/Mark11530/?action=view¤t=MAH05771.mp4, http://www.holley.com/data/Products/Technical/199R10226.pdf. The Holley Super Sniper High Performance EFI kit comes with a coolant temperature sensor and an O2 sensor, both of which must be used for the EFI to work properly. Capability Range: Advanced The adapter plate installs in between the exhaust manifold and the riser/elbow allowing for the water jackets to still be in place and an o2 sensor to be installed in the still dry exhaust gasses. He is a wizard, might be able to give you some pointers, will ask you what version of the software you are on, whether you're running the progressive adjustable linkage, etc. This fixed the high throttle position sensor reading (TPS) of above 1% that likely caused my idle issues. Find a lower price anywhere and we'll beat it by 5%! Have to replace head gasket. Precisely Adam. Using the throttle body's fuel pressure regulator will require a 5/16" fuel return line to the tank. Sniper throttle body linkage opens all four barrels evenly when you depress the throttle. My bet based on longer pump run, to make pressure, you have a leaking injector. I've seen O2 sensors in water jacketed headers that have worked fine for years. It may not display this or other websites correctly. CTS (Coolant Temperature Sensor) - Reads engine temperature. My boat is still in winter storage. Specs. Oxygen sensor: It's perfectly OK to share narrow band oxygen sensors with the stock ECU. I have installed the Holley hp efi MPFI on my twin inboard mercruiser 350ci 270 hp. Without Headers Steamers location (above) is perfect, up close to the engine where you have not lost much heat. The boat underway acts very much like a water brake dyno I strongly believe that a well broken in engine in good condition can stand a much more critical tune w/o issues and deliver almost the same fuel economy as the proposed EFI conversion. Holley Oxygen Sensor O2 Bung Weld-In Style; Larger Image. Go to the web site and it will explain the installation it is very simple and works well.As for the rpm you are comparing to completely different animals (pumps). Note the temperature sensor mounted on the back of the driver side head in the above photo. You will need an O2 sensor to measure fuel needs, but it could be tuned manually like in the old days. Holley EFI requires several pressure inputs in order to run an engine. so mine has been pretty good but 1 out 20 starts you can hear the fuel pump run longer then normal..when it does that it will light off then diebut if i put my foot to the floor it will start..still working on that 1..timing i am running 12 cranking.20 idle.40 cruze.35 wotstill playing with all of this..Mine is also a sniper stealth. Having the same problem with my sniper as well, intermittent hot (and cold) start issues. I've dunked mine lots of times. Holley has a pump almost identical in size to the OEM pump and it's not difficult to change. The included fuel system places a 340LPH fuel pump in the tank, which can easily be . check out the. An update from Al:After installing them I used the auto tune program on the Holly HP V4 software and they are working great. Followed all the instructions to the letter. I would prefer to run this brand new Holley EFI system in a closed loop, not set the fuel map, and use the O2 sensor as only a sensor. Sniper EFI 4500 Marine. Part # 554-155. And who can blame them? I was thinking aluminum heads would run it up closer to 5,000 rpm. But it is going to be a little tricky. So there is at least some probability of success. . That sounds like one solution. I have a boat with twin 3.7 Mercruisers. It's fast, simple and absolutely free. 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. I will keep the replacements as spares. I installed a holley sniper kit. 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. Having selecting USCG-approved components, and sourced your O2 sensor adapter, there is but one more challenge--tuning. What I installed on the motors was the Holley HP 19lb Holley Injectors the Holley 522-198 duel sync distributors with the MSD Digital 6A and the MSD Blaster 2 coils. Price Point: $$, Robust, feature-rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps. Warranty Information. It will crank and run great for 2-15 seconds then die. I am just now ready to do the tuning this weekend. If you are not running the latest software stop guessing and go download it. In the end I ended up using a Fuel Control cell made by Pleasure Craft Marine for their 351W engines. The truck started fine after install, and ran down the road ok. pull the sensor out of the exhaust. Supports up to 650hp with Four 100 Lb/Hr Injectors! Add to Cart . $5 Off Your $100 Mobile App Purchase . $132.95. What Is Pinion Offset, And How Does That Affect You? 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. Douglas Cline. The clamp-on that came with mine wasnt a good fit on my 2" pipe. Replaced and gapped to .45 all spark plugs. Wherever you go, the cultural kaleidoscope of Taipei showcases exhilarating diversity. This doesn't mean it can't be done. It may not display this or other websites correctly. Throttle body mounted ECU - no extra boxes to mount. Everyone raving about customer service is telling the truth! So far so good. 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. You have to angle it to help the throttle cable get around the booster. Spray a rag down pretty good with brake cleaner. No prime, but a second later it's ready to crank 'normally'. Wideband vs Narrowband sensors - A narrowband O2 sensor is only calibrated to . blue doberman puppies. Sniper EFI 4bbl Marine. Holley Sniper EFI Oxygen Sensors 554-155 Other countries likely have simmilar approval processes for marine engines. Bolt-on carburetor style EFI for your classic car or truck. If you're not running one (or if you are and the water has killed it) then it is not surprising that you are running rich. He also explains how to properly install them. I also capped off the regulated return line with a hose, clamps, and chamfering bit. Tech Resources. Tips on how to measure the correct location and other considerations when welding in an O2 sensor bung. a leading manufacturer of aftermarket Wideband O2 sensor kits, the following may damage or destroy oxygen sensors: . I received my replacement TPS and O2 sensor. Let me know how I can be of assistance. Yes, this is going to be an added expense, however, it will help guarantee your success. I'm about to embark on the same type of project. Add To Cart. Come join the discussion about offshore racing, performance, modifications, builds, classifieds, troubleshooting, maintenance, and more! While this is extremely unlikely if you are having immediate, back-to-back O2 sensor failures you should make the effort to rule this out. Capability Range: Moderate Replacement Sniper and Terminator X O2 Sensor, This part is legal for sale or use on Racing Use Only Vehicles. 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. It appears that its a tuning issue. Adam. O2 sensors are water proof. Holley recommends a 3/8" fuel supply line. 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. Followed all the instructions to the letter. I had an o2 sensor fail on a pass yesterday, and flatline at 11.5afr. Runs like a champ now.