There is a 30-amp fuel pump relay built into the Sniper wiring harness so no additional relay is needed. The better option is to use a bulkhead fitting, hose-barb adapter, and convoluted PTFE hose that reaches the tank where possible. ), I have the sniper efi system with the holley retro-fit in tank electric fuel pump. How Sniper EFI Helped Get The Andersons' C10 Project Back On Track. Too much and it will simply idle high and can be manually adjusted down. I bet this fixes your problem. I always recommend fixing one thing at a time. Hard to answer. Robust, feature-rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps. That article is actually written by Holley's Tom Kise but I'll be glad to help on it. Anouther cause may be the proximity of a dual plane intakes plenum divider to vacuum passages under the throttle body resulting in an odd sucking or whistling sound. One thing didn't make sense to me. Power glide with 1.80 first gear, 6,200 converter. This is a bit tricky. Is that an expectable by-product of adding this relay? Hi Chris, i just installed the sniper on my 406 small block it is a full roller motor with a high lift cam,started right up seems really rich at idle? Thanks! Nobody ever thinks to do this but one of the best tips for confirming that you don't have an issue with your Sniper fueling is to remove the breather, get in a position where you can see all barrels, have someone power on the system, and look for an equal quick spray of fuel in each barrel. A tube type 90 is equal to adding 3 feet of fuel line between the tank and pump. 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! ), In my ongoing quest for knowledge prior to installation, I have another question. Don't let that get the best of you. The Ordering process was so easy and non-painful. The A/F Ratio starts at -1.0 and decays to zero at 140 degrees. Awesome Article. 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? Why? You just have to go one direction and see if things improve or not. Any time that a fuel pump cannot create the regulated pressure that means it's not flowing enough fuel. This is especially true if you crank quickly but your data log shows a big rich spike immediately after achieving the crank-to-run RPM. 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. Seems like thats what its doing. My car idles beautifully @ about 800rpm. Ramp Decay Time: How many seconds the ECU will use to lower your idle to the target once it drops within the range specified by item 2.). Any time you enable that input the new target AFR would take effect for as long as you keep the switch enabled. Now, at each RPM setting you'd add (or subtract) whatever from the Target AFR so that the new target is 14.0:1. Holley Technical Training Manager Tom Kise recently published a list of ten "suggestions" for Sniper EFI System installation and I offer them here essentially unedited. The only thing I'd point out is that when under extreme load (as you will almost certainly be when using the cut-outs) is the most risky time to be running open-loop. Upon achieving 400 RPM, the ECU turns on the fuel pump and injects the fuel specified by the base fuel map and learn table, supplemented with after-start enrichment and coolant modifier fuel (as shown below.). Oil control: If you're burning oil you will kill your O2 sensor, closed loop chasing unstable fuel supply issues( see fuel pumps comment). I did put an external regulator on fuel return but other than that everything is the same. Not bad but maybe we can improve that. (You DO have a fuel pressure gauge installed, right? But as you go farther back, it only gets better. Does it matter if O2 sensor goes in drivers side with true duals?Thanks for spending your time helping us weekend mechanics. If, after setting the fuel prime percent above your warm start is perfect but your cold start is suffering you can tweak the multiplier up or down and see if that helps. If you turn the ignition off and back on, & crank it, it will start & die again. Holley Sniper EFI Check Latest Price. Hello, The four-injector version, which we tested, supports 650 hp, while the available eight-injector version supports 1,250 hp. Does pressing the throttle slightly allow the engine to start. My solution was to significantly reduce both the Coolant Temperature Enrichment and A/F Ratio Offset corrections. Directly to the BATTERY!!! It will work on three, two, or even one cylinder of exhaust, but with each reduction past four you increase the likelihood that you are not seeing a balanced mixture and that your closed loop correction is going to be inaccurate.The purpose of putting distance between the merge point and the O2 sensor itself is to ensure that the exhaust is mixed adequately. Sometimes, the thing would start and run, and other times it was most difficult to start. You may have an injector connector that has come loose.A final note that I can't emphasize enough. I discuss idle setting procedures at some lenth here and you'll note that I never mention sound. I have a light flywheel and high compression - also a close ratio 6 speed racing manual trans and I need the rpms to drop asap for shifting. This is normally completely adequate. Once engine is warmed up been driving for awhile. Holley did not include it on the Terminator X, which started life as a multi-point EFI ECU. Even better, buy yourself a bit of insurance by scheduling some dyno tuning (fuel and ignition timing) with a competent professional tuner. 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. Unless there are some sort of idiosyncrasies specific to the fuel system on the '88 Ford F150 of which I am unaware, this should work fine provided the factory pumps can provide enough fuel for the current engine. Upon achieving the crank-to-run RPM the cranking air is reduced in order for the engine to achieve the desired idle speed. Cranking fuel lets us compensate for that drop in pressure. The fuel pump should turn off after 5 seconds until the motor is started. Is there enough cable to get to the battery? ), Do you see a single brief pulse of fuel injected, in equal amount, in all barrels? 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. Instead, what most folks find is that the sucking/slurping sound that comes in a very few of the Sniper installations can be solved completely by installing a spacer gasket between the Sniper throttle body and the intake manifold. Your engine will be dependent on cranking fuel entirely. I really want to go EFI this year. I read where you need to disable the rev limit verification feature on a 6425 MSD box but was wondering if it's the same for my 6014 LS box? 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. All of the hard starting issues were IMMEDIATELY RESOLVED both cold starting AND hot starting issues, the car still runs like a scalded dog, and the screen no longer drops out when cranking the car.IN THEORY - The throttle body and ECU is looking to control cranking fuel, starting fuel, after start fuel enrichment, and IAC positions AT START. If you free dumped it in the top, it will aerate and foam up the fuel. So I installed my O2 sensor vertically, straight up & down on top of exhaust pipe about 18" after collector. 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. Be sure to watch the video embedded at the link above. Further frustrating the effort is the fact that the air/fuel ratios provided before the engine is firing on all cylinders are essentially meaningless. Here is where the denial starts. The xflow instructions state it needs 60 psi. Did your engine start the first time you turned the key after installing your EFI system? You need a new fuel pump. Starts & immediately dies. I just installed a Sniper 4150 on my 78 Monte Carlo with a stock 305 and a dual plane intake. Yes, the fuel pump comes on initially to prime the line but then it shuts off and fires the prime shot. Capability Range: Moderate Had issues so Im now going with the Holley in tank pump. I like to have the idle area of the fuel map about 14:1, the cruise area about 14.5:1 and the WOT area about 13:1. 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. what is the proper air/fuel ratio for a sniper on a ford fe 352? Bolt-on carburetor style EFI for your classic car or truck. 4-hole spacers seem to work better than open spacers. 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. These are listed on the handheld in the same window as the IAC Parked position (as described above.) Start the motor with the air cleaner off and the chock butterfly held open if it stays running its the chock. This helps ensure that any trash that might have been in the line somewhere is swept somewhere other than into an injector. You may have a pinched injector signal wire that has the injector on permanently. 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. 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. 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. EFI Systems based on Holley's world-class Dominator and HP ECU's. If you do this and your fuel pump still runs then see about returning your Sniper system under warranty. The amount of air allowed in is configured via the IAC Park Position and is temperature dependent. You have answered all of my emails, given great technical advice, and have also given the best product support Ive ever had. In all fairness, the Holley instructions MAKE THIS POINT CRYSTAL CLEAR but hey! You might want to try changing around the plumbing a little bit and see if that helps. Even if you don't let the engine get warm you will have changed the starting characteristics by making a start so you'll need to wait for the engine to get back to a fully cold/dry state before you can data log another start and measure the effectiveness of it.But you already have a pretty good clue that you need more fuel if two prime shots make it easier to start. ( you do this and your fuel pump still runs then see about returning your Sniper under. To try changing around the plumbing a little bit and see if that.. Of adding this relay everything is the proper air/fuel Ratio for a Sniper 4150 my... The engine to start achieve the desired idle speed it matter if O2 sensor goes drivers. Exhaust pipe about 18 '' after collector late-model V8 engine swaps link above ). The plumbing a little bit and see if things improve or not glide with 1.80 gear... The Terminator X, which started life as a multi-point EFI ECU here you... 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For that drop in pressure sensor vertically, straight up & down on top of exhaust pipe about 18 after! Just have to go one direction and see if things improve or not after achieving crank-to-run. Direction and see if that helps sensor goes in drivers side with true duals? for... My emails, given great technical advice, and have also given the best of.! A little bit and see if things improve or not your Sniper system under warranty farther back, it gets! For that drop in pressure brief pulse of fuel injected, in my ongoing for! Ratio Offset corrections flowing enough fuel solution was to significantly reduce both the Coolant Temperature Enrichment and A/F Ratio corrections.

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