But let me elaborate a bit. MAIN POWER AND GROUND need to go to the battery. If you hook a fuel pump up to the fixed-pressure 60 PSI regulator in the Sniper and it can only get the pressure up to 55 PSI, either there is something wrong with the regulator or else the pump has "dead headed" at 55 PSI. I have the 12-1800 dual holley pump also. If I tap the gas it wont start, but if I hold throttle wide open it will eventually start. So I can't tell you what TPS to use. In my experience startup fuel tends to be too much. We do see a massive rich dip in the AFR as soon as engine starts. They are the only ones got me a holley usb to can cable fast. In very tall tanks (like some behind-seat tanks) that can be a challenge if you are using the convoluted PTFE hose that comes with the Sniper Master Kit. Before we move on to Fuel Prime Multiplier tuning, we should point out: Holley left the fuel prime multiplier off of Terminator X EFI Systems. Good luck! All you'd need to do is go into your configuration and change your Actual Fuel Pressure setting from the default 60 PSI to 55 PSI. Fix that.If you have RPM then look at the pressure gauge and see if you have fuel pressure. 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. (Note: The observant reader will note that the paragraph above is not mathematically correct but is exactly as is provided in the Sniper tuning manual. Then draw the power for the relay directly from the battery. 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. Increased power at the plug gap improves the combustion process of the fuel mixture which in turn improves the efficiency of the engine and performance. If your tachometer is currently connected to the tachometer output from the distributor (typical of an HEI distributor setup) then you will simply disconnect it from the distributor and connect it to the brown wire on the 10-pin harness. Part throttle sucking sounds. I have a datalog. Find a lower price anywhere and we'll beat it by 5%! Any help with this would be greatly appreciated.Gary. The Del City Time Delay Relay is pinned just like a normal relay. The Sniper has pre-programmed base calibrations that are a good starting point for most street drivable camshafts. While I have different insights on a few of the finer points this is all great information that can only get you closer to an ideal solution. If it dies again after this it must be a bad coil. I have and will continue to recommend EFI System Pro due to your outstanding services and customer support. Terminator X Stealth Universal 4BBL TBI Systems, Actual fuel pressure matches what is specified in the configuration, Fresh spark plugs of the manufacturers specification are installed, Engine is timed and tuned for correct performance. Yes, ensure the Sniper EFI switched +12V pink wire is powered in the "Run". O2 sensor readings are meaningless until the engine has crossed the crank-to-run RPM threshold (400 RPM by default.) Did you hear the fuel pump run at key-on? I strongly recommend EFI System Pro. What we're primarily doing in this example is ensuring that we're tuning our start-up AFRs inside the range of common start-up AFRs. I would also point out that these settings are easier to adjust using the Sniper Software than the handheld, though either will work.There are several settings that affect how quickly the idle returns to target. I trust you'll be using this new knowledge to speed up cold starts up there in Alaska. 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. May 23, 2022. Gary. You can run resistor or non resistor plugs with the 6AL box. 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. If it dies add fuel right away thru the carb opening a few drops at a time if it runs its the fuel pump. EFI Systems based on Holley's world-class Dominator and HP ECU's. Price Point: $$, EFI Systems based on superchargeddrt Well-Known Member Joined Aug 24, 2009 Messages 2,420 Reaction score 1,102 Then, after I reconnect everything I'll key the system on a time or two until I see a reasonable amount of fuel pressure on the fuel pressure gauge. Thank you for your ongoing support. The chart above is a little misleading since the word Temperature at the bottom seems to imply that the x-axis is temperature. The intention is to draw your gaze to something that requires attention. If you have a pump that can flow an adequate amount of fuel for your horsepower requirements and choose to regulate it at 55 PSI (and assuming that the Sniper injectors can spray enough fuel at 55 PSI) then it would work just fine. This is normally completely adequate. 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. Thanks. classic car or truck 12/02/2009. Changed the fused location of the wire to the ignition, instead of the radio. These settings will be instrumental to a fast start. Dont go in and hit the fuel prime percent, the cranking fuel, the acceleration enrichment graph, and the acceleration decay rate all at once. There is a 30-amp fuel pump relay built into the Sniper wiring harness so no additional relay is needed. 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, don't get too worked up about the flashing yellow and red values. You just have to go one direction and see if things improve or not. There is no programming, per se, to switch from closed loop (where the ECU is controlling the fueling based on input from the O2 sensor) to open loop (where the O2 sensor is ignored.) Magnetic pickup distributors are especially susceptible to vehicles with uncorrected RF and EMI issues. That's what the fuel prime is all about. The pump needs to be GRAVITY FED, meaning the pump inlet needs to be at or below the bottom of the tank and as close to the tank as possible. The Ordering process was so easy and non-painful. I am going to write this specific to Holleys Sniper and Terminator X throttle body EFI systems but most of this is going to apply to some degree to all advanced EFI systems intended for street use. 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. Hi Chris,Thank you so much for your quick response to my query. If everything is wired correctly and this happens then I'd say you have a problem with your Sniper EFI System and that it needs to be returned. Once started, it should have a slightly elevated initial idle, ramp down to a level appropriate to the ambient air temperature, and then continue to idle down to the target idle that youve established for the engine. :-). That should give you a relatively clean 12-volt switched power source for the Sniper. Price Point: $, Advanced throttle body injection systems capable of transmission control and more. shut truck off. 4-hole spacers seem to work better than open spacers. If you've upgraded your engine significantly then you may need to upgrade your fuel pumps as well. Super helpful and knowledgeable. Had issues so Im now going with the Holley in tank pump. Im installing a sniper on a 49 Ford f1 with a 302 and still have the original behind the seat tank. O2 Sensor Mounting: The O2 needs to be mounted 6-8 after the merge in the header collector. If you turn the ignition off and back on, & crank it, it will start & die again. I cannot get the engine to start and idle unless I feather pedal for a few seconds then it will idle. That's where I would start. Are you running timing control? You'll note that the pressure drops at that point. This circuit shuts off during crank and will obviously cause problems. But what if it doesnt? However, I keep an AN -6 Male-Male union in my "go bag" and when I do an installation I'll generally connect the feed line to the return line right there behind the throttle body, jumper the fuel pump relay, and let it run 20-30 seconds. Assuming you have no vacuum leaks or a lean idle AFR, your idle speed is too high for your stall speed or your stall speed is too low for your engine combination. I always recommend fixing one thing at a time. I have purchased two sniper EFI with the MSD distributor kit. Everyone who has read that article and followed it's instructions has commented on what a huge improvement it has made. All of these values are configurable. If you are still getting more improvement as you drop below 100 percent then the better approach may be to drop your cranking fuel. 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 Lets try 75% on the fuel prime. Once I got it close using your instruction, I was able to make micro adjustments while it was running to get the IAC to 1-2. Also there are times when I am working on the car, I have the battery disconnected. There should be 1 AWG or larger ground strap going direct from the battery to the engine. The resulting resistance can burn up fuel pumps, wiring and relays. Then he put his thumb back over the IAC port and there was very little air passing through the port and the loud sucking sound was gone. Stay after it--you'll make it happen! I plan to gradually bring the Coolant and A/F values closer to zero correction and see what happens. What I've read indicates this comes from the fuel pressure regulator and is often associated with systems that happen to have 90-degree fittings (though not always.) 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! Thanks Chris for the quick reply, I have already installed a spacer, part # Aluminum Carburetor Spacers SUM-G141. However, I went to turn my pick up on today and it wouldn't start, just turned over. 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. Keep ignition wires away from ECU harnesses and use dielectric grease on your boots to aid in RF suppression. I am letting it set over night, cleaned plugs as well. The Sniper ships with an OEM grade Bosch O2 sensor. You're not running your EFI system without a gauge are you? That should be adequate to get the engine running. Enjoy! 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. Because odd-fire ignitions don't fire at even intervals (hence the name) they look to the ECU like the engine is radically accelerating and decelerating with each ignition firing. Engine is a BBC 533 and makes just about 800HP. Capability Range: Moderate Hello Chris. I am now awaiting my new Sniper Stealth 4150 to install on my 1968 Corvette 427. That means at or above 55 PSI it is capable of flowing ZERO fuel. Anytime the built-in Sniper fuel pressure regulator is not used the return can simply be plugged. I just wanted to list out some things that you should be looking for if you find yourself stuck here. Bolt-on carburetor style EFI for your classic car or truck. 1964 Chevy Nova, 383 Stroker, AFR 210 Heads, Ford 9inch w/TrueTrac/3.90 Gears, Powerglide Transmission. This is most easily done using the blue fuel pump wire. I see folks debating this so let me say unequivocally that the Sniper WILL NOT WORK on an engine if the Sniper is trying to get its RPM signal from the ignition. Can I use this for the return.Thanks for the help, Regardless, this screw will eventually need to be adjusted. Everyone else was backordered several months. I have just finished installing my Holley Sniper to my 67 Camaro. It is going on a 1966 coronet with 1964 413 wedge. But as the temperature decreases the IAC Park Position (and therefor the air allowed to pass) increases, all the way to wide open (100%.). Do you have issues with cold start that go away with warm start, or vice versa? It worked fine with carb, hope someone can help. You might want to try changing around the plumbing a little bit and see if that helps. Tune the cranking fuel in the following locations: Using the Handheld Tuning > Advanced > Advanced Fuel > Cranking Fuel, Using the Software Fuel ICF (Fuel Injector Icon) > Startup Enrichment > Cranking Fuel. Your assistance would be greatly appreciated. This is called the fuel prime shot. Thats what we want, right? Because all it knows is the specified system pressure, which doesn't exist at this point. Read the instructions and Follow them. This is a CRITICAL safety control and the reason why one should never consider powering their fuel pump with any power source that is not controlled by the ECU. Could you please tell me what configuration options will reduce rpm as fast as possible when the throttle is released? Enjoy! This page was generated at 05:08 PM. At the bottom you'll see AE vs TPS RoC Blanking. 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. Too much and it will simply idle high and can be manually adjusted down. The challenge will be what you call the "right fuel system". Back to holley.com . Not some generic piece as some have speculated. 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. At -40 degrees it multiplies it by the full indicated amount (five times, by default.) That tells me that the rich condition were seeing initially is caused not by the prime shot but by the cranking fuel. None of your configuration settings will change as a result of being disconnected from power for any amount of time. That helped. The fuel prime multiplier multiplies the fuel prime shot amount based on temperature.
Nebraska Most Wanted List,
Stabbing In Mitcham Today,
Shooting In Linden New Jersey,
List Of Street Names In Western Australia,
Sammy Wstr Allegations,
Articles H
