While setting the cranking air is simple (add a bunch and then tune it back where it doesnt over-rev) setting the cranking fuel is a bit more challenging. Can I lower it for this purpose? From what I read it should not be installed vertically? Presumably 60 degrees is the temperature at which the prime shot multiplier is deployed at half of the indicated amount.). 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. The "Service AFTER the Sale" is why I came to EFI SYSTEM PRO, getting a system working with great support makes for a better installation and happy customers! Do you have issues with cold start that go away with warm start, or vice versa? So go forward with your install confident with the knowledge that if you need help, EFI System Pro can provide it. But with patience you will get there. Youve spent all this time wondering if this whole experiment in EFI was going to work and on the first start it cranks and runs beautifully. features . 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. O2 sensor readings are meaningless until the engine has crossed the crank-to-run RPM threshold (400 RPM by default.) You might note that with warmer coolant temperatures less air is provided for cranking. So try cutting both of those numbers in half and see what happens. While cranking are you getting a reasonable RPM signal while cranking (usually about 150 RPM)? Free ground shipping regardless of order size! It drains the battery almost dead then will fire up. Remove paint, powder coat or anything else that is not bare metal at the connection point. Looking at the 4500 sniper and I run Super Street 10.90. Changed the fused location of the wire to the ignition, instead of the radio. 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. In fact, they may be terrible values when applied to your engine. Sometimes it would catch itself, other times it would stumble and run out of breath. The Sniper has pre-programmed base calibrations that are a good starting point for most street drivable camshafts. Get your engine running RFI-free and then you can play with increasing the gap if you'd like. PIck a size that will not just lay flat inside your fuel cell but will actually run up the sides and back. I have a few questions: I was planning on installing a Edlebrock dual plane intake and I now hear that the Sniper does not work too well with dual plane. 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). Whats the fix? Bolt-on carburetor style EFI for your classic car or truck. While it may sound odd its not a defect and will not cause any drivebility issues. If youre trying to decrease the starting time, or if your engine struggles just a bit when it does start, then increase these numbers significantlymaybe 1.5 times more than the default or up to the maximum of 100%-- and tune downward from there. Lets try 75% on the fuel prime. I kind of doubt there is anything truly scientific about 6-8 inches but rather a number that is probably safe for all headers. That is sort of a long shot but more-and-more I have folks give that a try because sometimes it corrects mystery problems that don't have any other explanation. Price Point: $$$. Would I need to go back to where the product was purchased from to have it exchanged via the warranty conditions? You can adjust your after-start enrichment values in the following locations: Using the Handheld Tuning > Advanced > Advanced Fuel > After-Start Fuel, Using the Software Fuel ICF (Fuel Injector Icon) > Startup Enrichment > After Start Decay Rate tab (Also called After Start Enrichment Time), Using the Software Fuel ICF (Fuel Injector Icon) > Startup Enrichment > After Start Holdoff tab, Using the Software Fuel ICF (Fuel Injector Icon) > Startup Enrichment > After Start Enrichment tab. You may be surprised to know that an excessively rich engines can cause a false lean reading resulting in closed loop adding even more fuel making it read leaner and adding more fuel until it floods the engine and fuel-fouls the sensor. May 23, 2022. The sniper master kits ship with OEM grade 255 LPH Walbro Pumps. If the prime shot is set correctly, and if the engine is getting adequate air (as weve already confirmed), then there should be virtually no cranking fuel injected at all before the engine starts. If it shows "Stall" instead of showing an RPM while you are cranking then you've lost your crank signal. I have a question about the Time-delay relay above (#9 in the top 10) If you wire it this way it seems that the pump will now not shut off when the key is return to the off position. 02/23/2023. Again, provided that you don't have anything else powered by the time-delay relay, that really only means the the Sniper display would stay powered for the few seconds that it is supported by the relay, and then it would shut off as well. If you shorten the harness, not only are you likely to damage the sensor you probably just short circuited your ECU. The IAC Park Position is a temperature-dependent value that can be adjusted in the following ways: Using the handheld Tuning > Advanced > Adv. 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. If the fuel pressure is a little low don't worry about that. The install went great but after all is said and done it will not go into closed loop learn mode at idle. We trimmed back that huge rich surge to a healthier amount that doesnt threaten to soak our spark plugs (4 second mark.) Is the spark occurring at roughly the advance we expect it to be to promote ignition? EMI is what wipes out all the electronics. . There should be no relay added to this wire. This, in turn, will power the Sniper. Seems like thats what its doing. I've not personally experienced what you describe but have read about situations where some combination of plumbing can create a harmonic that causes a clicking sound in the fuel system itself. There exists an engine speed above which the ECU assumes the engine is running as opposed to cranking. I am in the middle of plumbing my new sniper throttle body system. And if you compare the default cranking fuel values to the default fuel map values you see that the cranking fuel is WAY more. But you can extend the leads using wires of an equal or heavier gauge. Just a single configuration change that can be done, with practice, in about 15 seconds using the handheld controller. Holley knows how to do math! I've gone through all the steps and cannot seem to solve the problem. Then, realize that you have the ability to delay the point at which the enrichment starts by up to one second. Here is where the denial starts. May God's grace bless you in the Lord Jesus Christ. 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. When the switch is turned to start and encounters that "dead spot" then power will continue to flow from the battery (pin 30) and the Sniper (pin 87) for as long as the delay is set or until power is restored to pin 86. Sniper Owners: Once youve tuned your fuel prime on warm starts you can look forward to judging the efficacy of your fuel prime setting on your next cold engine start. Capability Range: Moderate 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. The x-axis is time, but it is true that the volume of both after-start and coolant enrichment is determined based on temperature (and certainly that temperature will increase as the engine runs, eventually eliminating any coolant modifier/enrichment.) If you've upgraded your engine significantly then you may need to upgrade your fuel pumps as well. (Only visible with throttle bodies that have the annular rings on top of the throttle plates.). We offer two potential solutions. Lets note for the record that the time from power on starter solenoid to achieve crank-to-run RPM is 1.13 seconds. My problem is that it starts and stalls instantly then acts flooded. Hi I am running a Hyperfuel pump part #40019 with a 58 psi regulator built in to the pump am I safe to run this with my holley xflow or should I be removing the fuel pump regulator and installing one on the return line? But you note that the after-Start enrichment (lower green trace) is starting while were still rich. to zero, but I think you'll find that you will stall. Chris, this is going to be an easy one. Run the switched 12-volt back as close to the ignition as possible. If you turn the ignition off and back on, & crank it, it will start & die again. If you free dumped it in the top, it will aerate and foam up the fuel. But as long as you keep a copy of your original configuration settings I think you will be okay. 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. Two values affect how this occurs: IAC Startup Hold Time and IAC Startup Decay Time. If you have RF and or EMI issues you need to correct them. Great article. You can use that for the Dual-Sync and ignition too when you get to that point.Running the O2 sensor on a single side of the dual exhaust works fine. The kit I bought: https://www.summitracing.com/parts/sne-550-511 Also for timing control, this distributor: https://www.summitracing.com/parts/sne-565-302 Any help with this would be greatly appreciated.Gary. Clicking, ticking and sucking sounds. All seemed well with the setup and going through the handheld. I can't find a good spot in the fuse block, I don't recommend this. Awesome Article. That should be adequate to get the engine running. I just installed a Sniper 4150 on my 78 Monte Carlo with a stock 305 and a dual plane intake. 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. Is a tremendous volume of fuel sprayed in all barrels? 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