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This was for MPFI. Part# 534-199. Each engine has the Holley marine 2 barrel carburetor. 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. 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. Wideband Realities: The Truth About Oxygen Sensors - EngineLabs temporarily running without WBO2 sensor? - Holley I myself will convert my 2 302's (Volvo Penta 5.0 l AQ231A) from carbs to EFI; I must find out everything before I start work on the engines, then I am satisfied to start. 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. All times are GMT-6. I have also installed a sniper system on a 350 Mercruiser and was wondering if you have done any tuning on yours yet? I will keep the replacements as spares. 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. Mike. *Free Shipping & Handling only offered to the contiguous US on orders over $100, excludes clearance parts and oversized packages. This Video Shows Ideal O2 Sensor Placement! Good luck! I thought about adding some sort of extra protection but never did. Holley Oxygen Sensor O2 Bung Weld-In Style; Larger Image. Ref: https://www.holley.com/products/fuel_systems/fuel_injection/sniper_efi/I heard of the new Sniper EFI from some chatter on OffshoreOnly.com. Description. Installed the sniper/MSD combo on my mildly built 460 KEM. The engine floods and it is embarrassing when leaving a lock. The first thing to consider here (if you are in the USA) is US Coast Guard (USCG) Safety Approval. The plan is to 'learn' a fuel\Timing curve with a closed loop. When either of these operating temperature ranges is exceeded, the sensor can no longer be . It turns out that the loading generated a propeller in the water is significantly different than wheels on pavement, so much so that the map has to be tuned differently. Bolt-on carburetor style EFI for your classic car or truck. Looking for some advice pertaining to Holley Sniper and Tire Size upgrades. And the relay and fuse were mounted along the firewall. 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. Register now for free!) 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. Sort. I've dunked mine lots of times. YES! EFI Systems based on Holley's world-class Dominator and HP ECU's. While these base maps are generally quite good for cars they are going to be pretty far off in the case of marine applications. 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. Bosch 17025 Oxygen Sensor #1 Best Seller . We may earn a small commission from affiliate links and paid advertisements. He had one there that was run on a dyno then the fuel map was set and shipped back. Sniper throttle body linkage opens all four barrels evenly when you depress the throttle. Items 1 - 21 of 21 Items. Add to Cart . Sniper EFI 4bbl Marine. Mine is right where Steamers is, and works well with my AFI TBI. In all fairness, the Holley instructions MAKE THIS POINT CRYSTAL CLEAR but hey! Without Headers Steamers location (above) is perfect, up close to the engine where you have not lost much heat. New 100 owner, long time cruiserhead - https://forum.ih8mud.com/threads/new-100-owner-long-time-cruiserhead.1300238/. Customer Rating: 4.3 out of 5 stars: 4.5 out of 5 stars: Had to replace the oxygen sensor on my car for the terminator x after the original one failed and this fixed all my problems. The O2 sensor burned out immediately. This motor would probably turn the berk to 6 grand and blow it out from a stop.Motor dyno'd on a carb @389 hp @ 4700rpm and 497 tq @3500. There are five significant plug connections to make from the throttle body: Plug into the oxygen sensor. 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. Get fast, Free Standard Shipping on orders over Summit Racing Equipment from $99 -- no shipping, handling, or rural fees! Let me know how I can be of assistance. They are the only ones got me a holley usb to can cable fast. In the end I ended up using a Fuel Control cell made by Pleasure Craft Marine for their 351W engines. Capability Range: Professional Prime cannot be adjusted on this old unit. Given the traditionally poor fuel economy of carbureted marine engines, we feel your pain. Will I be able to control my ignition timing with the Sniper? 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. This doesn't mean it can't be done. Make sure to put anti seize on the threads. The oxygen sensor should be mounted at a point where it can read a good average of all the cylinders on one bank. Some parts are not legal for use in California or other states with similar regulations. Has been since the 80's. Add to Cart . 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. I had the pink ecu signal wire connected to a bullet connector on the passenger side . Everything is included to completely plumb your fuel system including; 20 feet of 3/8" EFI Hose, in-line fuel pump, post and pre fuel filters, return bulkhead, and all of the necessary fittings and hardware. non biased Shelby Cobra related site! Holley EFI 554-155 Holley EFI Oxygen Sensor I wouldn't say "never", but the last time I asked that specific question I was told it wasn't anywhere on the horizon. I'll let you know how it works out. RPM going up and down , miss firing and backfiring. Held finger over IAC and it ran better, the thing was just wide open all the time and had nothing to suck. I will be calling around to see if I can find someone to help that has experience. It flows 850 cfm and can support up to 650 horsepower. I installed the adapter and elbow so it's at an angle above the entry point. Search for O2 Hotel Taipei Main Station discounts in Taipei City with KAYAK. Holley has a pump almost identical in size to the OEM pump and it's not difficult to change. These types of adjustable on-delay timer relays are on sites like Amazon for less than $10 up to $15. We can hear the initial fuel spray into the body, but it appears that its not enough to start the engine while hot. See Details. I think installing a wide band O2 sensor in the manifold(s) is a great idea. Have to replace head gasket. I have also picked up another .5 gallons per hr to about 9.25 gph. Anyone have a good place to find a genuine Bosch O2 replacement sensor without paying $110? Holley Sniper EFI System is Easy, Budget-Friendly Path to Fuel I took my time soldered every wire connection and routed all the wires carefully to avoid any emt issues. Ordered another dominator Bosch from Holley and it matches perfect. Comes VERY complete.throttle cable bracket, kickdown bracket, base plate studs & nuts, heat shrink type connectors, and pretty decent instructions as well. holley efi. Wondering how you are progressing with this? 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. A forum community dedicated to performance boat owners and enthusiasts. . Taipei has dozens of world-class restaurants where gourmets can sample the most authentic Chinese cuisines. 3. Howell indicates that this adapter was designed for the Chevy type Mercruiser manifold but that it should work on any similar marine wet manifold. Brand: Holley EFI Emission Code: 5: Material: . I have installed the Holley hp efi MPFI on my twin inboard mercruiser 350ci 270 hp. O2 sensor failure on a Holley Sniper EFI - YouTube I hope that the next F/2F header is more O2 sensor friendly. 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. Followed all the instructions to the letter. 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. Advanced throttle body injection systems capable of transmission control and more. Sniper EFI - Holley 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. It could be an instant fix. Holley EFI Oxygen Sensor. You will still get some water on the engine side of the snails, mainly at low Rs. 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 had questions on the suggested "Marine O2 Sensor Adapter" from Howell EFI (https://howellefi.com/product/adaptor-o2-sensor-for-marine-use/), but when I look to the pictures, I understand how it will work. $108.95. The Holley Sniper EFI Quadrajet is a self-contained throttle-body injection system that's a direct replacement for spreadbore Quadrajet carburetors found on many classic GM vehicles. The very front would be the safest place. Douglas Cline. Adam. The Fora platform includes forum software by XenForo. Increasing efficiency is always a good idea. So please, If you have problems registering or can't log into your account, please. While those work great on an automobile, you likely won't begin to get these marine installations setup with a handheld. 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. My boat is still in winter storage. 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. If you are not running the latest software stop guessing and go download it. the Hamilton 212 pump is maxed out at about 4600 rpms, however it will provide about 10x the thrust that the berkly it is not as fast but haul much more load and work way better in white water. It doesn't even mean that you can't do it. Holley Sniper - Oxygen Sensor Location | IH8MUD Forum Now the lower cost Holley Sniper advertised for March 31 2016. watch the values in the software for the o2.. once is is done "Heating" and starts to show AFR, wrap the rag round it. The truck started fine after install, and ran down the road ok. It only runs rich on start up for a second due to the prime, after start it runs great. If you've done some automotive fuel map tuning before, you can likely overcome this challenge. Ive got a set of bassett headers for a BBC, ill see if they can fit under the transom. Full time feedback from the sensor is what the computer uses to refine the fuel table. (Assuming it actually releases in November and there are enough units for me to purchase and receive one in December). 100% identical. It may not display this or other websites correctly. On EFI systems such as Holley's Sniper, all of the EFI sensors (except for the O2 and coolant temperature sender) are mounted snuggly in the throttle body. Brand: Holley EFI Emission Code: 4 . I have about 30 hrs on the unit and it just keeps getting smoother with every hr of run time. Wiring the Holley Sniper EFI system is equally easy. I had an o2 sensor fail on a pass yesterday, and flatline at 11.5afr. After discussing it in this thread and talking with Holley's tech support, I decided . Free ground shipping regardless of order size! looking at doing the same. Use a return fuel line. It does this every time..when you start a warmed up engine, its too rich and starts poorly without throttle. Sniper EFI 4bbl Marine. Did you use the Holley fuel pump and have you had any issues with it? Holley sniper help!!!! | ClassicBroncos.com Forum In order to do this, it heavily relies on proper O2 sensor placement. *Possible delays due to Covid-19 click for more information. Here's the pic of the location with my header. Throttle body mounted ECU - no extra boxes to mount. Assuming that your current ignition works well with the marine carburetors it will continue to work well with the Sniper EFI System. I'm using the NTK sensor. Capability Range: Moderate 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. The spark must be manually tuned. WARNING: It is against the law to install this part on an Emissions Controlled Vehicle, By Corey A on June 4, 2021 | Verified Owner. I also capped off the regulated return line with a hose, clamps, and chamfering bit. Having selecting USCG-approved components, and sourced your O2 sensor adapter, there is but one more challenge--tuning. It appears that its a tuning issue. Sadly, no. My hand is holding the connector to the sensor. 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. Free Shipping - Holley Sniper EFI Oxygen Sensors with qualifying orders of $99. Note that this is a different sensor than Holley uses for their Dominator/HP/Terminator/Avenger series. You must log in or register to reply here. As far as packaging goes, one comes in a Bosch box, the other in a Holley package. Then turn the engine off and "lock in" the tune in a non-feedback loop mode, and quickly remove the headers and wash them off to prevent damage and then swap to the manifolds, but that would honestly be a huge PITA. Capability Range: Professional Maybe this one has a shorter cable? Add to Cart . This requires a considerable additional investment but as long as you're doing things you're not going to do them half-way, right? Holley efi behavior with bad o2 sensor, safety feature Any word on this? Miami, FL. To those who have installed the Sniper EFI units, please post up some photos of where you tapped the exhaust line to install the Oxygen Sensor's weld bung. Find a lower price anywhere and we'll beat it by 5%! I have tried several different settings to get it going, no luck. 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. I have a local customer with a pair of big blocks in his offshore boat that is eager to get started on this. JavaScript is disabled. Waiting for spring to put back together. Categories. I have twin 502 factory fuel injected Mercs and want to go to adaptive EFI. 29. Introducing Sniper EFI Master Kits, with a Returnless Retrofit Fuel Module. #1. Product Q&A . Thanks guys. Using the correct length carb stud and nuts, tighten the Sniper EFI throttle body down progressively in a "criss-cross" pattern (60-80 in.lbs.). But it is going to be a little tricky. Hooker BlackHeart Oxygen Sensor O2 Bung 2.25" Clamp-On Style, Hooker BlackHeart Oxygen Sensor O2 Bung 2.5" Clamp-On Style, Hooker BlackHeart Oxygen Sensor O2 Bung 3.0" Clamp-On Style, Holley Oxygen Sensor O2 Bung Weld-In Style. Can more detail be provided? Aftermarket headers are pretty much the only safe way to run an O2 sensor. The wiring was a bit of a mess. A replacement clamp on would be an easy change out. When it did keep running, the headers all started to smoke. Holley 2300 is their nomenclature for a 2-bbl generic fitment carburetor. Master ASE tech since 91. 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. Q3. An update from Al:After installing them I used the auto tune program on the Holly HP V4 software and they are working great. 2023 Holley Performance Products, Inc. All Rights Reserved. It works fine. (Assuming it actually releases in November and there are enough units for me to purchase and receive one in December). Capability Range: Advanced Since your existing low-pressure fuel system is not going to work with the Sniper EFI System this puts you in the unenviable position of choosing between USCG compliance or EFI. Warranty Information. In Stock. holley sniper efi Holley Sniper EFI Self-Tuning Master Kit - Black Ceramic Finish $1,475.95 Part# 550-511K holley efi 100 PSI Stainless Pressure Sensor $155.95 Part# 554-102 Are you waiting to convert your carbureted vehicle to Sniper EFI, but don't like the idea of mounting an external fuel pump? I am a competent mechanic and I have checked all the usual suspect items. I want to register an account for free right now! 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. The light shines in the darkness, and the darkness has not overcome it. Do you offer a USCG fuel pump kit? 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. Do you recommend in-tank or external fuel pump? Then dialed back the cranking fuel quite a bit and that seemed to help some, but still having ongoing issues. Copyright 2017 Cyberspace Automotive Performance, Inc. All Rights Reserved. Follow USCG rules about materials and fittings. the engine not running. From time to time we receive phone calls from individuals who are interested in converting their carbureted boat motor to fuel injection. running holley sniper without o2 sensor - plural.works As far as a sensor goes, absolutely nothing. Sent unit back to Holley. The ones in the Bosch box come without warranty. The included fuel system places a 340LPH fuel pump in the tank, which can easily be . The clamp-on that came with mine wasnt a good fit on my 2" pipe. Since the Sniper install, I encountered my second O2 sensor failure so I thought I would try the "Innovate Bung Extender" recommended by a few folks here. *Free Shipping & Handling only offered to the contiguous US on orders over $100, excludes clearance parts and oversized packages. While the Sniper has an absolutely outstanding internal ECU, the current model does not offer any laptop programmability. You really want a bigger engine. No one cares about your buddies old antiquated garden hose technology. Sniper EFI 2300 Marine. Then if that doesn't work call the tech line they are great! The wide band O2 sensor is required for initial running and calibration. Thinking about this I think this will work very fine! Was in marine engineering for years. The O2 sensor burned out immediately. I have not gone back in to try to fine tune them. 02/25/2020. On a side note: Im getting 4200 rpms at 5000 elevation with stock heads. Holley Sniper EFI Oxygen Sensors 554-155 Ran about 5 seconds and died. I've installed several of these adaptive EFI's on cars with great success. If you call, they usually let you put in your name and they get back to you. a leading manufacturer of aftermarket Wideband O2 sensor kits, the following may damage or destroy oxygen sensors: . I have searched thru the forum as much as I can, with not much luck. Followed all the instructions to the letter. Everything about the fuel prime shot can be adjusted. (Image/Wayne Scraba) The throttle body is a bolt-on replacement for a carburetor. If this is a first time effort, find a tuner in your area with marine experience. Apr 13, 2017. with the extension. Also, with Headers you loose 600 to 700 degrees between Head and bottom collector, you don't want to read that loss. I don't have enough experience with marine applications to know exactly what it will take to solve this. If you're thinking that you've read everything above and are ready to toss the carb on your marine engine then take this handy quiz to make sure! I installed a holley sniper kit. The engines are rated at 170 hp each. I'm about to embark on the same type of project. Holley sent him a new one for free. Price Point: $$$. We use cookies to enhance your experience while using our website. Brass adaptor designed to install heated oxygen sensor in water-cooled marine exhaust risers. Sep 14, 2021. 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. Fuel economy went from 12.5 to 13.5 gph to 10 gph. Currently has 2 bbl carburetor and mechanical distributor, mechanical fuel pump for 165hp. I want to register an account for free right now! 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. Why? It does not work with the Sniper EFI oxygen sensor. It will not fit on round or oval risers without a suitable flat area. 1985 fj60 (sold back to Toyota), 1997 fzj80, 1971 fj40 with 75 2F. The Sniper EFI could very well be one of the easiest to set-up fuel injections systems ever. As I have since added above, the Sniper simply isn't going to be the system to use to tackle this problem. In this case, the prime shot is good for cold, but too much for warm. 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 . Add to Cart . 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. The right side o2 was obviously reporting a fat 10.3 afr as a result, but the car still went 139mph, LOL. "Old Yeller" gets Holley EFI Sniper O2 Sensor Installedhttps://www.holley.com/products/fuel_systems/fuel_injection/sniper_efi/sniper_efi_stealth_4150/sniper_. (If I am incorrect I heartily invite your comment at the bottom of this article!) I purchased the Holley HP MPFI system and went to the lake with it. Holley EFI Usb/Can Harness, Sniper Tbi. Holley EFI requires several pressure inputs in order to run an engine. Engine Startup Tuning for Sniper and Terminator X Stealth Owners $102.95. B/c what it sometimes perceives as a lean spike is actually raw fuel with no oxygen. Tips on how to measure the correct location and other considerations when welding in an O2 sensor bung.