Quick Start Tuning. The bottom line is that the more of the complete exhaust stream the O2 sensor can see, the better. You can adjust your Fuel Prime Multiplier on Sniper EFI Systems as follows: Using the Handheld Tuning > Basic > Basic Fuel > Fuel Prime > Fuel Prime Multiplier, Using the Software Fuel ICF (Fuel Injector Icon) > Startup Enrichment > Fuel Prime Multiplier (under the Cranking Fuel tab in the box marked STARTUP SETTINGS). Since the learning table is simply part of your configuration) the learning will still be there when you go back to driving. If the fuel pressure is a little low don't worry about that. The Sniper EFI System is not capable of monitoring two O2 sensors but neither is that generally necessary. More on that later. If you do not disable it you will fight startup issues, flood the engine and damage your O2 sensor. That helped. You need a new fuel pump. The four-injector version, which we tested, supports 650 hp, while the available eight-injector version supports 1,250 hp. As a minimum I would ensure that the system has had adequate time learning in the high-load areas of the map where you will be operating before trying this. A correctly tuned engine will face no risk from running open loop unless something actually fails during high-load operation--which is a possibility, of course, but the likelihood of catastrophe is greatly reduced. Capability Range: Advanced it runs well at part throttle but at wide open throttle the engine has very little power and backfires.where do i go from here. Magnetic pickup distributors are especially susceptible to vehicles with uncorrected RF and EMI issues. Capability Range: Advanced There is a 30-amp fuel pump relay built into the Sniper wiring harness so no additional relay is needed. Ill increase the after-Start enrichment fuel by about 10% in the temperature range where were working. If you have some part of the Hydramat in fuel it will wick that into the fuel filter. All of these values are configurable. Is there enough cable to get to the battery? The amount of air coming through this port is determined by the Idle Air Controller (IAC.) Price Point: $$, EFI Systems based on Many of these are completely normal with EFI. Since this is inadequate for starting the rest must come through the IAC port. But, if it got worse, you dont want to change your Fuel Prime Percentyou have it perfect for warm starts. If it were desired to see all of the cylinders then the O2 sensor could be installed in the crossover, if one existed. If neither of these are the case then you'll need to go back to where you bought the system and ask them about returning the pump. It drains the battery almost dead then will fire up. I always recommend fixing one thing at a time. That's a spread of 200 degrees so half of that would be 100 degrees. One thing I miss is the instant drop in rpms that my 650DP had. Any help with this would be greatly appreciated.Gary. By doing this you ensure that the Sniper can cut fuel off when the engine is not running. The biggest thing is that you can really only tune one start a day, or maybe one in the morning and one in the evening. Then I will provide an image of how this variable looks in the software. 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. But weve also introduced some leanness from 4-10 seconds. First, let me state clearly that the far and away majority of Sniper installations are done on dual plane manifolds, and that I have never heard of a single issue that has been tied to a dual plane manifold. Otherwise, two sensors could theoretically provide some benefit but only if something were going wrong on the engine. If you're getting in the 10's your asking for issues. superchargeddrt Well-Known Member Joined Aug 24, 2009 Messages 2,420 Reaction score 1,102 The car is 31 years old with only 13 500 miles on it. Then, click on AE vs MAP Rate of Change and change that to 15 as well. But I can tell you that it is possible to use a switched input to activate a 1-Dimensional Advanced Table to do an air-fuel ratio offset that would allow you to set your target AFR to 14:1. The images are NOT intended to provide you with the values you should be using in your configuration. Fortunately, Holley has another product that can solve that: Hydramat.. Hydramat is not inexpensive but you won't believe what it can do. 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. 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. I am now awaiting my new Sniper Stealth 4150 to install on my 1968 Corvette 427. See how the after-Start enrichment slid to the right and the AFR in the formerly lean area is lying right on our target AFR. Capability Range: Professional (Dont forget and then later wonder why it wont start!). Thanks for your help system is working great!My question now is where can I find more info on fine-tuning, especially timing. Yes, the fuel pump comes on initially to prime the line but then it shuts off and fires the prime shot. Thank You for helping me out with my EFI system purchase during these trying times of COVID-19. Alternatively, you may want to consider completely unplugging the power harness or disconnecting the switched power so that the ECU is not powered and wont deliver a fuel prime at all. Extending wires with too small of a wire gauge will also result in the same damage. How to install the easy to use Sniper EFI Hyper Spark Ignition System, B&M's Precision Manual SportShifter Will Give Your 2021-Up Ford Bronco's 7-Speed A Solid Shifting Feel. Yes, I have fuel pressure. Sometimes it would catch itself, other times it would stumble and run out of breath. Get a gauge. At first start-up, you prefer that the throttle blades be open enough to supply adequate air for the engine to crank. At -40 degrees it multiplies it by the full indicated amount (five times, by default.) And the less correction you do until you understand that---the better! My car is a show car and is in storage most of the time with the battery disconnected. late-model V8 engine swaps. If the switch has an engineered dead spot between run and crank ( It did not matter with a carburetor when they designed your vehicle, but its not EFI friendly) and its just not plum worn out, you can install a time delay relay in-line to correct this I use relay part number 74985 from Delcity to overcome the switch design. 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 Bolt-on carburetor style EFI for your classic car or truck. How do you set this up?Thanks! Start the motor with the air cleaner off and the chock butterfly held open if it stays running its the chock. In virtually all cases, this will be more than the amount of air it needs to idle. 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. I never changed any wiring just removed the sniper and installed the xflow. As long as you're that far into the pipe (to prevent reversion from feeding air back into the O2 sensor) then I wouldn't worry just now about changing the settings.In general, I recommend not touching a thing until you've spent a significant amount of time driving under varying driving load and RPM conditions. If you have RF and or EMI issues you need to correct them. Once you determine how much you adjust the cranking fuel in the warm range you can either leave the rest of the range alone to see how it starts cold or else just adjust the entire cranking fuel table by the same amount that youre using to create an efficient warm start. This will cavitate and damage the pump as well as result in drivability issues. Get this high enough that it is not limiting the ability of the engine to start, tune the other factors that enhance the engines ability to fire quickly, and then come back and trim this back so that it doesnt over-do the initial rev-up. Enable a 1D table3. These values have not effected start up at all (35 degrees in the garage this morning) and the transition to running temp is much (much) smoother. Fuel must also be added to start the engine. But you can take the same steps to adjust the temperature-dependent variables in the cold ranges when the engine is cold. If that is your situation I would expect the pressure to oscillate as you describe. I have a 88 f150 302 with factory efi and dual tanks. This Mr. Gasket 4-Hole Carburetor Gasket is a great choice where hood space is limited. This page was generated at 05:08 PM. I'm glad this approach worked for you. Latest Articles. Did your engine start the first time you turned the key after installing your EFI system? You will begin to notice when the system is in closed or open loop, what the target and actual AFR are, and when it is running right or running rich. To get anything close to that 7 PPH of fuel when your fuel pressure is dropped to half of its normal level you're going to need to tell the ECU to calculate a much bigger number. Everyone else was backordered several months. If you don't show any fuel pressure then fix that. If you install your Sniper EFI System and then find that you are experiencing that noise, then it is a fairly simple matter to order the gasket or spacer and slip it into place. Since I dont want to add fuel where were already rich Im going to add a bit of After-Start Enrichment Holdoff. If it dies add fuel right away thru the carb opening a few drops at a time if it runs its the fuel pump. Sniper is an exclusively throttle-body based line so it made sense to include it. :-) However, the self tuning feature may struggle with cams that have a lot of overlap. The default for these systems is 400 RPM. Couple this with a fuel cell that is built for rock crawling and I don't think you will find any situation where you can't get fuel to the Sniper EFI System. Everyone raving about customer service is telling the truth! This is most easily done using the blue fuel pump wire. and go to restart warm, it catches starts for a flick of a second, drops to a stall, or sometimes will catch its self and start. Because that is very repeatable. Some good info here thank you. 02/23/2023. First, there is the obvious--the system has to learn. Do you see an issue with this? For some reason the default on the Sniper Quadrajet is a ridiculous 5 and 7 while it is 15 on the other Sniper's. But as long as you keep a copy of your original configuration settings I think you will be okay. Installed my Sniper, went through the startup procedure. I can't find a good spot in the fuse block, I don't recommend this. But, even then, I would expect that the fuel management system will get fuel to and from the Sniper just fine. Then draw the power for the relay directly from the battery. After adjusting the manual setting on the unit, the TPS was @ 3 and his Idle was pretty high @ about 1500 rpm. Have you ever watched a post nuclear apocalypse movie? When a wide band sensor is (DAMAGED) it almost always reads dead lean. Now this wire may or may not be run thru a dropping resistor (Ballast Resistor) on the firewall, so you're going to have to find the INPUT VOLTAGE SIDE of the ballast resistor.Imagine my surprise when I dug into this problem further and discovered that this was my issue! 1964 Chevy Nova, 383 Stroker, AFR 210 Heads, Ford 9inch w/TrueTrac/3.90 Gears, Powerglide Transmission. FE 390 that currently has a Pertronix distributor with the Ignitor 2 module. Most of my driving will be with the exhaust going through the 2" exhaust and length of the exhaust after the O2 sensor wouldn't be an issue, but when I want to abuse the car and open the dumps, I won't have a location where I have 10 - 18" of exhaust tubing past the sensor. Don't let that get the best of you. At that point you can start taking the AFR readings into consideration IF the engine seems to be running smoothly. 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. Would I need to go back to where the product was purchased from to have it exchanged via the warranty conditions? Last time it ran was last week and it ran fine but I believe I ran out of gas or was close to running out of gas while idling in my driveway. Copyright 2017 Cyberspace Automotive Performance, Inc. All Rights Reserved. A low air to fuel ratio means the mixture is rich. Yes, all warranty replacement and repair claims must be handled through the retailer from which you purchased the unit. Beyond that you can turn your cranking fuel down. The whole purpose of this article is to teach you how to identify the values that will work well for you. It will add fuel based on the temperature and won't affect your warm start.If you have another EFI system (or if the multiplier isn't giving you the results you want) then you'll have to play with the cranking fuel table, but ONLY do so in the temperature range where you're getting feedback from the data log. First, it is fake news that EFI doesn't like big cams. Here is where the denial starts. Thanks. Start by increasing your TPS and MAP ROC blanking values. All it knows is what it sees in the pipe. But I have MSD 6 AL. Do you have fuel pressure? *Possible delays due to Covid-19 click for more information. Avoid using any 90 degree fittings between the tank and pump. Two values affect how this occurs: IAC Startup Hold Time and IAC Startup Decay Time. Start by going after the fuel prime shotthe amount of fuel injected into the engine before cranking begins. I figured it would be minimal. That delay is called After-Start Holdoff. Why? Sure enough the pink wire DID NOT have voltage when cranking. Quick to respond and very knowledgeable. My question is if both of my fuel pumps are wired from relays to my rocker panel where does the blue fuel pump prime wire connect or would you just not use it altogether. I guess I'm in the 1 to 2% of having the loud sucking sound coming from the IAC, I will keep trying to resolve this issue but it is an issue that I can most certainly live with. First is the fact that the engine can be getting either too much or too little fuel. Your engine will be dependent on cranking fuel entirely. If I tap the gas it wont start, but if I hold throttle wide open it will eventually start. Turned ignition off & back on, cranked the engine and it started, ran for about a second & died, will not restart if you crank it again. Does it recover if you bump the throttle? My situation, although related to start up, is somewhat different. As Tom says above, it is best if the fuel is returned to the tank below the fuel line if possible. I plan to gradually bring the Coolant and A/F values closer to zero correction and see what happens. Is one barrel not spraying at all? Runs good, but dies while I drive down the road. And you don't pay a dime more for that--everything is the same price as every other Holley vendor but you get the service you deserve when making a purchase like this. to zero, but I think you'll find that you will stall. If you free dumped it in the top, it will aerate and foam up the fuel. Am i doing the right thing? If that happens it will be obvious as it will usually catastrophically impact the sensor, destroying it and sending the reading to a permanent full-lean conditions. 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. Best Overall. Pressure holds steady at approximately 50 psig when engine is off. Happy New Year! i.e., 5x at -40 and 0 at 160. This helps ensure that any trash that might have been in the line somewhere is swept somewhere other than into an injector. Let me know what works for you! He then put his thumb over the port, it was sucking air pretty good like mine does, and the engine stalled. So try cutting both of those numbers in half and see what happens. Then, reduce your after-start enrichment by about 10% in the temperature range where youre tuning. Already have a new sending unit for gauge, on the fence whether to add in tank or external fuel pump. The Ordering process was so easy and non-painful. I have an '89 Jeep 4.2L with a Sniper 2300 2BBL on it. My car idles beautifully @ about 800rpm. Too much and it will simply idle high and can be manually adjusted down. Continues rich and then goes a bit lean. Read the instructions and Follow them. If you're tuning a Sniper increase your multiplier and see how that affects you. It turns out that in EFI , as in life, there are no shortcuts to excellence. I strongly recommend EFI System Pro. Why? 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. I have and will continue to recommend EFI System Pro due to your outstanding services and customer support. Probably 3-4 seconds, and rich after it does fire. Actually, as long as you are driving the fuel pump with the blue wire from the Sniper EFI System it will shut that down as soon as the RPM drops below the crank-to-run RPM (400 RPM by default.) But I strongly suspect that is not the case. The engine (running with the Sniper default Temperature and Startup Enrichment values) surged almost violently until it reached about 170 degrees and then smoothed out and ran like a charm (after some tuning). Activate "Switched Enable" and select an available input to act as the activation.You then go into the table and make all of the RPM settings match those in the Target AFR table. 10.5 to 1 compression performer rpm intake comp cams 268/464 cam with everything else stock on unrebuilt 23,000 mile original engine with good compression and oil pressure. Ran well on carb and electronic ignition. Question is, do I just plug what was the return at the throttle body? That is not the case. Goat Rope Garage 76.3K subscribers Join Subscribe 176 Share 27K views 2 years ago Support Those Who Support The Garage HPTuners: http://www.hptuners.com Show. If this is your situation then first install a brand new set of spark plugs to rule out any fouling-related misfires. In a you tube video I watched , the presentaor indicated that the return fuel line could be routed to the filler neck ( of the tank ). The mid-way point between -40 and 160 degrees is 60 degrees, not 40 degrees. Cranking fuel lets us compensate for that drop in pressure. :-). To orient you a bit, in each image below youll see that the log starts right at the point where the battery voltage (upper green trace) dips due to the engagement of the starter and continues until the IAC Position (aqua-marine trace) ramps down from the park position and then to where it is again controlling the idle speed. Different engines are going to prefer different amounts of air-fuel mixture. That should be adequate to get the engine running. At least not right away (after time-delay set in relay). Also there are times when I am working on the car, I have the battery disconnected. Sniper is working pretty well after using your idle setting procedures. Any tips or info on cold starts? This is normally completely adequate. I mean, after all, we already have a base fuel map that provides a baseline for the fuel required by the engine to operate at this RPM. If you turn the ignition off and back on, & crank it, it will start & die again. Love the example at the end. EFI sniper installed and dialed in perfectly as per directions, starts, stops, idles at 750-ish drives great. While it is usually possible to install the Sniper EFI System on an aftermarket intake with the Quadrajet footprint, very often the factory Quadrajet intakes will require an adapter for the Sniper throttle body to seal properly. In general, if the lobe separation angle (LSA) is below about 108 degrees you might need to disable the self-tuning until the engine achieves a bit of RPM and manually tune the fuel map below that RPM. Part throttle sucking sounds. We offer two potential solutions. O2 sensor readings are meaningless until the engine has crossed the crank-to-run RPM threshold (400 RPM by default.) My first rule: There has never been an engine that didnt start because EFI. Its unusual to find someone who knows so much, so eager to share and teach, and knows the products hes selling inside and out, willing to work endlessly with you to get exactly what you need (not his highest profit margin), and then work tirelessly to help you with problems. Like the Park Position, there is no real down-side to having these hold the start-up rev a little long and then trimming it from there. Also check your cranking voltage if it starts hard.

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