I tried holley tech support, no answer and put on hold for hours. 2. If you let it cool down again, does it start up fine? It's fast, simple and absolutely free. Also, with Headers you loose 600 to 700 degrees between Head and bottom collector, you don't want to read that loss. Pay close attention to the instructions on O2 sensor placement. I mounted it here attempting to protect it from the deep water I play in and from lots of branches I encounter. 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. Sniper EFI 4500 Marine. - The sales brochure refers to Integrated Ignition Timing Control and Coil Driver. An update from Al:After installing them I used the auto tune program on the Holly HP V4 software and they are working great. Without Headers Steamers location (above) is perfect, up close to the engine where you . The ones in the Bosch box come without warranty. 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. Posted By : / actual instructions in flowcharting are represented in /; Under :nose exercise before and afternose exercise before and after 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 . I'm using the NTK sensor. Hopefully this one lasts longer than the original. It flows 850 cfm and can support up to 650 horsepower. Sensors: Fitting: Threaded O2 . This requires a considerable additional investment but as long as you're doing things you're not going to do them half-way, right? Whether you're engine swapping your classic car or need to manage 4000 horsepower in your twin-turbocharged drag radial race car, Holley EFI has the solutions you need to get your project up and running better than ever! . I am interested in upgrading both engines with Pertronix Ignitor or Ignitor II ignition and the Holley Sniper EFI 2300 and the Howell EFI marine O2 sensor adapter. 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. I am a competent mechanic and I have checked all the usual suspect items. Howell indicates that this adapter was designed for the Chevy type Mercruiser manifold but that it should work on any similar marine wet manifold. 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. The other thing I want to overcome is the fuel return line; my harbor master says that I can connect my fuel return line to my CAV (lucas) gasoline filter, it has 4 connection, now only 2 are used. (Image/Wayne Scraba) The throttle body is a bolt-on replacement for a carburetor. Sniper throttle body linkage opens all four barrels evenly when you depress the throttle. This doesn't mean it can't be done. 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. Ive got a set of bassett headers for a BBC, ill see if they can fit under the transom. Note that this is a different sensor than Holley uses for their Dominator/HP/Terminator/Avenger series. 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 . On a side note: Im getting 4200 rpms at 5000 elevation with stock heads. 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. The Sniper EFI master kit contains the most complete EFI fuel system on the market. 534-199. He had one there that was run on a dyno then the fuel map was set and shipped back. . It should be pretty straight forward what each of these values do. The target A/F value based on load or MAF cfm, and engine speed. 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. Pricing was reasonable, shipping was prompt and Chris helped me with a wiring question during my install. Fortunately, it turns out there are some options. - You are currently viewing the forums as a GUEST. Wideband vs Narrowband sensors - A narrowband O2 sensor is only calibrated to . Everyone raving about customer service is telling the truth! - Do you know of a Carburetor Builder who has addressed the Coast Guard certification issues with the Sniper EFI? pull the sensor out of the exhaust. Can anyone share their experiences with this type of setup? They have been working out well for a few years now. 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. It is better to remain silent and be thought a fool than to open one's mouth and remove all doubt. Mark Twain, The goal in life: To die young as late as possible. To my knowledge, there is no aftermarket EFI fuel system suited to fuel the Sniper EFI system that exists on the market. 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. Seems to LEARN much faster than the Fitech did. Replaced and gapped to .45 all spark plugs. Sniper EFI Releases new Stealth 4150 Models! (REGISTERED USERS DO NOT SEE THIS POST/AD! Currently has 2 bbl carburetor and mechanical distributor, mechanical fuel pump for 165hp. Q3. Phil is right. Make sure to put anti seize on the threads. Any word on this? Innovate Motorsports HBX-1 Bung Extender. But MAP sensors are very easy to physically implement and are inexpensive. I'm guessing by snail, that's another name for the riser? The truck started fine after install, and ran down the road ok. I think installing a wide band O2 sensor in the manifold(s) is a great idea. Sensors that are installed in an exhaust must be connected to a properly 29. EFI is the wave of the future. Full time feedback from the sensor is what the computer uses to refine the fuel table. 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. JavaScript is disabled. 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. It would cost considerably more but a second option that would have added performance benefits would be to switch to a dry manifld such as the headers available from Custom Marine, Inc. 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. No one cares about your buddies old antiquated garden hose technology. *Possible delays due to Covid-19 click for more information. You really want a bigger engine. They are about 4 inches long, in-line between the log and manifold. The O2 sensor burned out immediately. 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. $108.95. away. Car runs perfect . That would be for individuals that run the OEM exhaust manifold, as well as individuals that run headers. There was a 1.5 point difference in afr between banks. I have not yet got it figured out. Thanks for the heads up. Have engine apart and head checked and cleaned at machine shop. Has been since the 80's. I want to register an account for free right now! Assuming that your current ignition works well with the marine carburetors it will continue to work well with the Sniper EFI System. If you have long tube headers, mount the sensor approximately 6-10" after the collector. 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. Holley EFI Oxygen Sensor. 5. replaced my original terminator x sensor that was mounted in an exhaust that took on some water and killed the original sensor. Restore | Make | Philosophize | Eat | Drink | Be Happy | Let's Go Brandon! Good luck! 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. Other? 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. So I bought the progressive linkage but you then have . well I have installed the Sniper on my 460 KEM (Ford) marine motor. I installed a holley sniper kit. Holley EFI has the solutions you need to get your project up and running better than ever! Who knows. #3. Specs. functioning controller during engine operation. Price Point: $, Advanced throttle body injection systems capable of transmission control and more. Holley sniper issue on newly rebuilt motor, Holley Sniper with Duraspark and timing control. Sniper EFI 4bbl Marine. Holley EFI Oxygen Sensor. About your only location is in that short area from the log to the port face. We also use content and scripts from third parties that may use tracking technologies. Comes VERY complete.throttle cable bracket, kickdown bracket, base plate studs & nuts, heat shrink type connectors, and pretty decent instructions as well. I am a competent mechanic and I have checked all the usual suspect items. 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. 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. non biased Shelby Cobra related site! The sniper fit perfectly on the intake. 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. EFI Systems based on Holley's world-class Dominator and HP ECU's. 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. Sent unit back to Holley. 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. This really applies to any O2 sensor regardless of EFI system. #1. The spark must be manually tuned. In order for it to work as designed the O2 sensor has to be installed in a dry exhaust system and needs to be placed 1-10in from the collector in the headers. Price Point: $$$. Register now for free! 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. I installed a Holley sniper system on my car and I've been fighting it for 2 weeks now. 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. Come join the discussion about offshore racing, performance, modifications, builds, classifieds, troubleshooting, maintenance, and more! Also the progressive link. From there, our highly trained factory refurbish technicians flow the original fuel injectors. The Sniper EFI could very well be one of the easiest to set-up fuel injections systems ever. 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. He had one there that was run on a dyno then the fuel map was set and shipped back. Still trying to find more info on electronic conversion, only found Pertronix replacement for points so far.. What TBI, fuel pump, sensors and ECM computer are you using? Systems that were already designed for marine efi. Everything about the fuel prime shot can be adjusted. It's hallmark is its simplicity--but in this case it is also it's shortcoming. Specs. If a cruiser with enclosed engine compartment, not a lot you can do to eliminate water or at least water vapor in the exhaust. Was told by holley tech support to make adjustments to the fuel prime percent and multiplier settings, played with those with no major improvement. . Register now for free!) Looking for some advice pertaining to Holley Sniper and Tire Size upgrades. Found out that it was due to rfi/emi. John 1:5, 1969 FJ40 2F with Holley Sniper EFI, Power Disk Brakes Front & Rear, Downey, Your post has peaked my curiosity. Brand: Holley EFI Emission Code: 4 . This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. Having selecting USCG-approved components, and sourced your O2 sensor adapter, there is but one more challenge--tuning. By Joshua C on August 10, 2021 | Verified Owner, Worked right out of the box. The basic kit comes with the TBI unit, touchscreen controller, water temperature sensor, a wideband oxygen sensor, and all the necessary wiring. Top 10 Holley Sniper EFI Tech Tips Holley Technical Training Manager Tom Kise's top ten "suggestions" for Holley Sniper EFI System installation issues. 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. 2014 FJ Cruiser - White - 4X4 - Loaded - . Mine is right where Steamers is, and works well with my AFI TBI. The following vehicles are considered Racing Use Only Vehicles: Holley is the new standard in EFI! Using the throttle body's fuel pressure regulator will require a 5/16" fuel return line to the tank. I was thinking aluminum heads would run it up closer to 5,000 rpm. 10 min read. Thanks. Aug 17, 2013. Service Oxygen Sensor for Sniper EFI Systems, Service Oxygen Sensor for Terminator X Systems. It does not work with the Sniper EFI oxygen sensor. The basic kit comes with the TBI unit, touchscreen controller, water temperature sensor, a wideband oxygen sensor, and all the necessary wiring. EFI EFI kit electronic fuel injection. Stock manifolds? #1. Installed a Lokar throttle linkage bracket custom made for the Sniper, removing the old one that had been on my Holley 750. I have also installed a sniper system on a 350 Mercruiser and was wondering if you have done any tuning on yours yet? Emissions. 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. 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.