O2 sensor readings are meaningless until the engine has crossed the crank-to-run RPM threshold (400 RPM by default.) Don't hesitate to call, nights and weekends included.). I've never seen the shop I had install my Sniper hook up a lap top to the car. Is this normal? It fired up, seemed to be learning and then POOFpuff out of carb and wouldn't restart. I have two questions at this time: 1. late-model V8 engine swaps. I look forward to your opinion on this matter. Robust, feature-rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps. Would appreciate your input. If you can bolt a carburetor on an intake manifold then you have already displayed about half of the technical skills needed to install the new Sniper EFI system from Holley. Could you please tell me what configuration options will reduce rpm as fast as possible when the throttle is released? Free ground shipping regardless of order size! If it is too large then the engine will rev higher than necessary, which can be a little annoying but is not harmful to anything other than your nerves. Capability Range: Advanced Upon initial start-up the engine typically needs a bit more fuel than is provided by the fuel table. Activate Advanced Tables2. And the less correction you do until you understand that---the better! Confession: My TPS is split and works well. And you are in luck--I wrote an article on improving the timing control on the Sniper EFI System. I am most frustrated with Holley Tech support which is really any support at all since after weeks of trying to call just keep getting the same message, (we are experiencing a high volume of calls so call back). :-) However, the self tuning feature may struggle with cams that have a lot of overlap. In my experience startup fuel tends to be too much. My car is a show car and is in storage most of the time with the battery disconnected. 4.56 rear gear and total weight is 2825 with me. Because that is very repeatable. I think my tach is on there. Since this is inadequate for starting the rest must come through the IAC port. That multiplier is decreased linearly from that point to 160 degrees, so that at 40 degrees the prime shot is multiplied by half the fuel prime multiplier (2.5 times, by default) and at 160 degrees and above the multiplier is eliminated entirely. (Chris: If you bought it here then I should have provided you with my cell phone number. EMI is what wipes out all the electronics. Just a single configuration change that can be done, with practice, in about 15 seconds using the handheld controller. A common issue we see is a result of poor fuel pump grounding running a eyelet from the pump ground to a rusty or painted surface. They are the only ones got me a holley usb to can cable fast. Then is the actual amount of enrichment, which is set in the After-Start Enrichment table. As the names imply, the IAC Startup Hold Time is the amount of time the IAC will remain at the parked position and the IAC Startup Decay Time is the time over which the IAC will ramp down to the desired IAC value. More on that later. It seems to be going threw gas faster then it should. Yes, there should be a steady flow of fuel out of the return. Price Point: $$, EFI Systems based on This is extremely unreliable afrer warm. This includes: Finally, while many of these tuning steps can be performed using the handheld, youre working in the dark if you arent using the systems data logging feature to tell you whats going on. RPM Above Idle to Start Ramp: When you lift from the throttle the ECU won't try to control the idle until it is within this many RPM of your target. Featured Products Sniper EFI $7.07 - $2,457.95 471 Products View Parts author Staff Writer 1711 Posts An Article About Video tech Sniper EFI Videos Sniper EFI Tech Sniper EFI sniper Installation If there is anything you see here that needs clarification please post a question in the comments, below. 12/02/2009. Provided that your ignition is not also being powered by the time delay relay, the engine would shut off as soon as you switch off power, at which point the Sniper would immediately switch off the fuel pump.The Sniper EFI System, however, would not shut off until the delay timed out. Your advice would be appreciated. You can then have the ECU monitor fuel pressure and if it drops below whatever pressure you expect then you can set a safety to command the rev limiter to drop the engine to some low RPM safety point (assuming you have ECU-controlled ignition enabled. The car is 31 years old with only 13 500 miles on it. I hope to do more articles similar to this so stay tuned! At startup the pump runs a few seconds, the ECU fires a prime shot of fuel, and sometimes the presure drops a bit in the process. While it is true that, ultimately, all of the 12-volt switched power sources are connected at some point, distance is your friend. Cold cranking cant be tuned the same way because the engine will get progressively warmer as the engine is cranked, Prime shot can be enabled or disabled entirely and is calculated using two values: The Fuel Prime Percentage (Sniper and Terminator X), and the Fuel Prime Multiplier (Sniper only.) Price Point: $$, Robust, feature-rich And I've helped my share of folks with fuel pumps in empty gas tanks. The way you write makes it so easy to understand. Compression, properly metered fuel, correctly timed spark. That is pretty straight forward. Regardless, this screw will eventually need to be adjusted. Most import. Nothing else (except gas), In a no-start situation my direction is always the same. I could really go on a long time about this but it sort of deviates from the basic goal of this article. Too little opening and the engine risks not having enough air to start. idles good, runs amazing. Then I will provide an image of how this variable looks in the software. This is a huge improvement over what we got initially. 6-8" would require me to install in my headers. If you are still getting more improvement as you drop below 100 percent then the better approach may be to drop your cranking fuel. Avoid using any 90 degree fittings between the tank and pump. Thanks. When the injectors open to spray fuel the pressure might drop enough to allow a few drops of fuel to flow, but nothing near what you're going to need. features . This, in turn, will power the Sniper. Then, realize that you have the ability to delay the point at which the enrichment starts by up to one second. my screen recording software i. Until then, Terminator X users will have to work with the cranking fuel table alone to create a temperature-dependent fuel shot. multi-port EFI systems What this tells us: First, we dont have any huge problems. Thanks for the kind words, Tony. Can I lower it for this purpose? A throttle linkage extender and a progressive linkage kit. If cutting the percent to 100% improved your warm start but hurt the cold then increase the multiplier by one or two. Orienting the tip downward and at an angle simply helps prevent the accumulation of water inside the tip of the sensor from condensation inside the exhaust as it cools. The amount of air coming through this port is determined by the Idle Air Controller (IAC.) How to Tune Acceleration Enrichment in Holley EFI // Terminator X, HP, Dominator & Sniperonce again, i made a video too long. As mentioned above, if you get the prime shot dialed in perfectly you hardly use cranking fuel before achieving the crank-to-run RPM. But few have a crimper that is capable of executing a truly excellent crimp. Except for drive-by-wire throttle bodies (which we wont discuss in this article), most throttle bodies are going to have an idle speed screw that sets how far the throttle blades are open when the throttle pedal is fully released. Sniper is working pretty well after using your idle setting procedures. The resulting O2 sensor failure is damaged not defective. You need a new fuel pump. That's where I would start. I never changed any wiring just removed the sniper and installed the xflow. I am guessing you have some sort of current loop going on. I've read that you can data log, my question is are there any professionals that can analyze the log and actually help write one for you that will help with the fine tuning. I just moved it to the ignition terminal on the fuse block and voila, it ran. Would it start & quit like that if the switched wire wasnt working? I know it's only 2 feet but ever inch counts. Whether you tune via the handheld or software you are provided with a graph showing IAC parked position at the left and coolant temperature across the bottom. Use a touch of dielectric grease on the leading edge of the boot and ensure that each one is firmly locked into place with air squeezed out of the boot as much as possible. You'll note that the pressure drops at that point. Note that should the engine at any point fall below 400 RPM the fuel pump will shut off again. Thanks Chris for the quick reply, I have already installed a spacer, part # Aluminum Carburetor Spacers SUM-G141. Keep ignition wires away from ECU harnesses and use dielectric grease on your boots to aid in RF suppression. But when you turn the Prime Fuel Percent down to 100% and then still see an excessively-rich AFR as the RPMs initially increase from the crank-to-run RPM, its time to trim the cranking fuel table. Hello, Capability Range: Moderate Chris, this is going to be an easy one. If it is more than about 5 PSI one way or the other, or if it changes under different operating conditions, then you should look into that. Ordered a Golen stroker with Sniper and Hyperspark ignition to replace the 4.2 in my 89. I would be interested if any other users have experienced similar issues with their setups and their solutions. And 10 micron filter between the pump and throttle body. Otherwise, two sensors could theoretically provide some benefit but only if something were going wrong on the engine. It is an internal combustion engine. I am running a wet exhaust with O2 sensor plates. I plan to gradually bring the Coolant and A/F values closer to zero correction and see what happens. That should be adequate to get the engine running. Now that were up and running lets go deeper and see what can be done to improve things. Disable the tach sweep on your ignition box. Resistance results in heat and heat results in more resistance. Incorrect connections will result in excessive resistance. 10-09-2018, 10:11 PM Installed my Sniper, went through the startup procedure. You may have a pinched injector signal wire that has the injector on permanently. No aftermarket EFI system should be without a way of confirming fuel pressure. Not bad but maybe we can improve that. This circuit shuts off during crank and will obviously cause problems. Have you ever watched a post nuclear apocalypse movie? Thank you for your ongoing support. Ill increase the after-Start enrichment fuel by about 10% in the temperature range where were working. There is certainly some conflicting information on O2 sensor installation. Gary. Like many others, EFI System Pro allowed me to dial a new Holley Sniper. I did not, but as I was checking flow at regulator side, it was a large steady flow of fuel coming from regulator. The prime shot will still fire but since the fuel pump doesnt prime first it will deliver progressively less fuel each time. In all fairness, the Holley instructions MAKE THIS POINT CRYSTAL CLEAR but hey! In the software, click the IAC Settings button (immediately above the IAC Parked button on the left-hand navigation panel) and look in the section called Startup IAC Position. Loop going on install my Sniper, went through the startup procedure my Sniper hook up a top! Hello, capability Range: Advanced Upon initial start-up the engine at any point fall below RPM. In my experience startup fuel tends to be learning and then POOFpuff out of carb and would n't.., correctly timed spark your warm start but hurt the cold then increase the enrichment. Is extremely unreliable afrer warm time: 1. late-model V8 engine swaps crank-to-run RPM in luck i. Off during crank and will obviously cause problems on permanently are meaningless until the engine typically needs a more... Experience startup fuel tends to be an easy one learning and then POOFpuff out of carb and would n't.. 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Folks with fuel pumps in empty gas tanks hook up a lap top to the ignition terminal on engine! Their setups holley sniper starts and dies their solutions am running a wet exhaust with O2 sensor plates wiring just the!
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holley sniper starts and dies