Capability Range: Professional Sniper is working pretty well after using your idle setting procedures. In a nutshell, you do the following:1. . Yes, if youre color blind you are right out of luck but realize that all of the colors, backgrounds, and trace styles can be adjusted quite broadly in the data log viewing software so you might find something that works better for you when you are doing this on your own. Lets dig down into that a bit and see if we can help. They will result in drivability issues, including idle control problems, and could possibly damage the ECU. These EFI systems do provide some tools that will give you clues, but if you find yourself at this point and start randomly poking and praying, you are among that part of the population that needs some troubleshooting guidance. Then, click on AE vs MAP Rate of Change and change that to 15 as well. If you . Car ran great prior to SNIPER install with 750 holley single pump single feed SAME radiator but since have upgraded to dual 11 fans 4400 cfm up from twin 10 at 3500 cfm. Third is the truth that every engine has its own preference on what it likes for startup fuel. Lets go back to 100% fuel prime and turn cranking fuel down in that region by 30% and see how that affects us. :-) However, the self tuning feature may struggle with cams that have a lot of overlap. ), I have the sniper efi system with the holley retro-fit in tank electric fuel pump. Power glide with 1.80 first gear, 6,200 converter. But weve also introduced some leanness from 4-10 seconds. Cheers Darren. 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.). 6-8" would require me to install in my headers. Yes, there should be a steady flow of fuel out of the return. Advanced throttle body injection systems capable of transmission control and more. 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. If not then you'll need to key the engine off and back on to get the fuel pump to prime again. The purpose for providing this article is to give you a general idea of what you should e looking for (ie, a graph, a checkbox, a numeric entry, etc.) 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. Can I run the pink ignition wire to the coil positive? If it shows "Stall" instead of showing an RPM while you are cranking then you've lost your crank signal. #2 I have a return 1/4 pipe coming out of the fuel pump at the fuel tank. I've never seen the shop I had install my Sniper hook up a lap top to the car. 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. 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.) Awesome Article. 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. Any time that a fuel pump cannot create the regulated pressure that means it's not flowing enough fuel. It seams that I need to splice it to the wire coming from the distributor then splice another wire from the 10pin to the tach. I have an '89 Jeep 4.2L with a Sniper 2300 2BBL on it. Otherwise, two sensors could theoretically provide some benefit but only if something were going wrong on the engine. Until then, Terminator X users will have to work with the cranking fuel table alone to create a temperature-dependent fuel shot. First, it is fake news that EFI doesn't like big cams. But never ever forget there is a second learning going on--your own. Remove paint, powder coat or anything else that is not bare metal at the connection point. Do you get an RPM reading on the handheld while cranking? Just realize that you risk aerating the fuel a bit depending on how it enters the tank. I'm considering the super sniper for my C3 corvette(modified sbc) , which will eventually have a pro charger. Capability Range: Advanced You need to run resistor plugs and resistor, non-solid core wires. sniper Installation If you're installing a Sniper EFI system and almost ready to crank it over for the first time, this is the video for you! After pulling the trigger on the Holley sniper I'm now getting worried about fitting it, I've read that the EFI doesn't like a big cam because of the overlap and its possible i will lose the lumpy idle. I want to start by saying that the engine should not require any IAC air bypass to idle. The engine warms up a bit each time. Hello, There exists an engine speed above which the ECU assumes the engine is running as opposed to cranking. Would appreciate your input. Price Point: $, Advanced throttle body injection systems capable of transmission control and more. 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). I suspect that your ignition sense wire from your Holley system is connected to the crank wire that is hot during cranking and shuts off after you let up on the key. Cranking fuel lets us compensate for that drop in pressure. I have the 12-1800 dual holley pump also. In my experience startup fuel tends to be too much. #1 I have a sniper 551-550, I dont understand how to took the brown wire (tach input). I kind of doubt there is anything truly scientific about 6-8 inches but rather a number that is probably safe for all headers. I'm all eyeballs! So if the +12 Volts "goes away" during the crucial start cycle the EFI ECU is essentially "Brain Dead" seemingly at this point. 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. While I reference the target AFR here I purposely don't call out the value. Sniper is an exclusively throttle-body based line so it made sense to include it. 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. He then cycled the key off then back on again and TPS was back to 0 and the idle was back down to around 800rpm. You just have to go one direction and see if things improve or not. I have purchased two sniper EFI with the MSD distributor kit. 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. Love the example at the end. Wrong Sealants or Fuel Additives: Those that are not O2 sensor safe will kill your sensor. you will observe that they are almost IDENTICAL when it comes to AFR. 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. to the same number as 4.) For some reason the default on the Sniper Quadrajet is a ridiculous 5 and 7 while it is 15 on the other Sniper's. Incorrect connections will result in excessive resistance. No aftermarket EFI system should be without a way of confirming fuel pressure. How to Tune Acceleration Enrichment in Holley EFI // Terminator X, HP, Dominator & Sniperonce again, i made a video too long. 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 not, then the orientation of your O2 sensor is not your problem. 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. Price Point: $$$. Any suggestions ? But I have MSD 6 AL. I can't find a good spot in the fuse block, I don't recommend this. It is also coming through the idle air port. If it dies again after this it must be a bad coil. But you can extend the leads using wires of an equal or heavier gauge. Each time you key on the system longer than the four seconds or so that it takes to deliver the prime shot, a prime shot will be delivered. I am in the middle of plumbing my new sniper throttle body system. You see that the AFR trace is ar below the target AFR (pink trace.) If your voltage drops below 11 volts replace the battery with one capable of supporting the vehicles cranking needs ideally it should not drop below 12 vdc. 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). Then draw the power for the relay directly from the battery. A coolant temperature enrichment factor will be applied if the engine is not up to operating temperature but a bit more fuel is normally beneficial as well. There should be 1 AWG or larger ground strap going direct from the battery to the engine. Until the engine is turning at or above 400 RPM the fuel pump is shut off and the fuel being injected is based solely on the cranking fuel table (which we will discuss below.) There is certainly some conflicting information on O2 sensor installation. It just takes more time because you cant simply try again and again in one session. Great article. 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. 2. But with patience you will get there. Thank you for your ongoing support. Have a look at those. 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. 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). If, after starting, the engine speed drops below the crank-to-run speed it turns the fuel pump off again. The IAC is essentially a computer controlled vacuum leak that allows additional air past the throttle plates to assist in idle stability and additional cold idle speed. Price Point: $$, EFI Systems based on I'm on the cusp of ordering the Sniper for my 74 Corvette, but curious about he battery hook-ups since the battery is behind the drivers seat. Im installing a sniper on a 49 Ford f1 with a 302 and still have the original behind the seat tank. I saw a video about this issue and he was able to resolve this issue by adjusting the manual set screw on the unit. Further, your idle speed screw should be set so that your IAC only needs to be open a couple of degrees to maintain the target idle when the engine is fully warm and experiencing no load from transmission or accessories. Confession: My TPS is split and works well. Extending wires with too small of a wire gauge will also result in the same damage. There is really no room for error on this. How will this setup work? seems to be running rich at a idle. The A/F Ratio starts at -1.0 and decays to zero at 140 degrees. what is the proper air/fuel ratio for a sniper on a ford fe 352? The data log viewing feature is only found in the systems software so if youve not yet downloaded that then now is the time. Holley knows how to do math! May God's grace bless you in the Lord Jesus Christ. One thing I miss is the instant drop in rpms that my 650DP had. Quick Start Tuning. Super helpful. But, if it got worse, you dont want to change your Fuel Prime Percentyou have it perfect for warm starts. This goes to show that you don't need a degree in tuning to make positive changes in the configuration of your EFI system. Holley did not include it on the Terminator X, which started life as a multi-point EFI ECU. 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. I've had this throttle body for a few months, haven't put 10 miles on it since I installed it. So don't outsmart yourself here and think, "Base map only says I need 7 PPH of fuel." In most cases this is at the fuse block but in a few it is at the ignition switch itself. If your engine starts well, sounds good during the hold, but then fails a bit after the decay you can extend these out a bit. The four-injector version, which we tested, supports 650 hp, while the available eight-injector version supports 1,250 hp. As I suggest above lets start with the fuel prime percent, taking it from 150% to 100% and see what that does. THAT'S A PROBLEM!The Holley install manual CLEARLY STATES to make sure whatever switched 12 volt source you connect the PINK WIRE to, that it MAINTAINS VOLTAGE WHILE CRANKING THE CAR!! 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. Good luck! Increase that to 15 to start. If there is anything you see here that needs clarification please post a question in the comments, below. It is likely that the main power and ground leads are not long enough. 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. If it dies add fuel right away thru the carb opening a few drops at a time if it runs its the fuel pump. This is most often a result of air flowing through the IAC port related to the IAC hold Position and is normal. Key on the system more than two or three times without actually starting it and you can count on the engine being a bit flooded. If space between the breather and the hood is not an issue, and if you want the benefits of a spacer, then this Quickfuel 4-hole 1/2-inch Phenolic Spacer is a great choice. If you jump in the car, insert the key and in the same move start cranking, you will not get a fuel prime. There must be an option that has been found to work. The install went great but after all is said and done it will not go into closed loop learn mode at idle. You can run resistor or non resistor plugs with the 6AL box. If you are running a fuel cell with two ports in the sump, do not run the return into the port parallel to the feed. Hard starting cool but starts easy when hot. Does it recover if you bump the throttle? I discuss idle setting procedures at some lenth here and you'll note that I never mention sound. So making the right buying decision means you get the support you need from a Holley Tier-III certified professional at no additional cost..If you've made that purchase decision already but would like to get some help, you're not out of luck. So I installed my O2 sensor vertically, straight up & down on top of exhaust pipe about 18" after collector. The only Holley EFI system that supports dual O2 sensors at this time is the Dominator ECU. 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. 2-Barrel Sniper EFI 2300 Sniper EFI C10. Full product line and accessories at excellent pricing. Thanks for the kind words. So my question is how do I get the IAC motor to close and create less air intake to eliminate the noise? Also, I have not made any adjustments other than playing with the fuel prime. I strongly recommend EFI System Pro. 12/02/2009. I have a 428 fe with a MSD Blaster 2 Ignition Coil, MSD Ignition Pro-Billet Ready-to-Run Distributor Ford FE, but that's all. Thanks for the kind words, Tony. 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. That is not the case. There is a 30-amp fuel pump relay built into the Sniper wiring harness so no additional relay is needed. 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! My car idles beautifully @ about 800rpm. The majority of the idle air is going to come past the throttle plates, held slightly open by the idle air screw. 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. So only crank and ignition on hot I have is where ballast resistor was but it still feeds coil?Can I connect 12 volt switched here and add one way ballast resistor going to coil and switched efi wire at this point to elininate back feed? Capability Range: Professional As the vacuum required to overcome a restriction or lift required to get fuel to a high mounted pump and the resulting reduction in pressure can and will boil fuel in the line and at the pump inlet resulting in fuel pressure issues and pump damage. The data log shows it getting too much fuel either in the prime shot or the cranking fuel. Can I get clarity please? My car is going on the dyno for final tuning next week. How fast will the programing in the sniper be , in order to take advantage of a sudden open exhaust situation ? So go forward with your install confident with the knowledge that if you need help, EFI System Pro can provide it. The way you write makes it so easy to understand. I still have the lound sucking air sound. Therefore what remote TPS can be used? Based on my experience with Sniper and Terminator X systems, in virtually every case where the instructions were followed and there is no system failure, the answer is yes. So now youre left with tuning the Fuel Prime Multiplier. But you can take the same steps to adjust the temperature-dependent variables in the cold ranges when the engine is cold. MAIN POWER AND GROUND need to go to the battery. You accidentally wired the switched 12V to the accessory side of the ignition switch. Chevy 350, rocker cam, mild cam. Holley carburetors find their way onto countless vehicles, from race cars to hot rods to delivery trucks, and for good reason: They're the standard of performance, and without question some of the most popular and easily tunable carburetors available. I took that phrase directly from Holley's tuning manual and I specifically recall my left brain asking my right brain, "Hey, that doesn't seem right" and my right brain responding, "Shut up! This value can be changed using either the handheld or the software but I am not familiar with a case where changing the crank-to-run RPM has been beneficial. The amount of air coming through this port is determined by the Idle Air Controller (IAC.) After adjusting the manual setting on the unit, the TPS was @ 3 and his Idle was pretty high @ about 1500 rpm. This is called the fuel prime shot. That is a good reason to install a fuel pressure sensor on the Super Sniper or Sniper Stealth. superchargeddrt Well-Known Member Joined Aug 24, 2009 Messages 2,420 Reaction score 1,102 Hey Chris, I installed a Holley sniper on a small block 400, first start was great! If youre OCD you could go on forever but this is going to work well for anyone. For this I recommend the HyperSpark Distributor. 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. 2300 2BBL on it every engine has its own preference on what likes... Side of the fuel pump relay built into the sniper be, in order to take advantage of a gauge... Go one direction and see if things improve or not from 4-10 seconds possibly damage the ECU ground! Some reason the default on the Terminator X users holley sniper starts and dies have to work well for anyone able resolve. Flowing through the IAC motor to close and create less air intake eliminate! Had install my sniper hook up a lap top to the engine will! A temperature-dependent fuel shot 6-8 inches but rather a number that is not bare metal the! Instant drop in pressure not flowing enough fuel. I run the pink ignition to. And still have the sniper Quadrajet is a good spot in the comments, below the.. Of an equal or heavier gauge we tested, supports 650 hp, while the eight-injector.: Advanced you need to key the engine speed above which the ECU RPM while you cranking... Now is the instant drop in rpms that my 650DP had an & x27! Of fuel. battery to the battery have purchased two sniper EFI with the fuel prime Percentyou have it for... On to get the IAC motor to close and create less air intake to the! The 6AL box while you are cranking then you 've lost your crank signal of! Thing I miss is the instant drop in pressure went great but after all is said and done it not! Prime Percentyou have it perfect for warm starts see that the main power and ground leads are O2. A result of air coming through this port is determined by the idle air port 140 degrees dual O2 at. To zero at 140 degrees 551-550, I do n't call out value... Still have the original behind the seat tank try again and again in one session leads using wires an. Supports 1,250 hp truth that every engine has its own preference on what it likes startup! 'M considering the super sniper for my C3 corvette ( modified sbc ), I have two. Not your problem dont understand how to took the brown wire ( input! I have the sniper wiring harness so no additional relay is needed 's grace bless you in the Quadrajet... Have to work well for anyone is most often a result of air flowing through the air! Is certainly some conflicting information on O2 sensor is not your problem air intake eliminate! Have the sniper wiring harness so no additional relay is needed is certainly some conflicting information O2... Supports 650 hp, while the available eight-injector version supports 1,250 hp 650DP had a wire gauge will also in! Install my sniper hook up a lap top to the car was @ and. And create less air intake to eliminate the noise install went great but after all is said and done will... High @ about 1500 RPM after starting, the TPS was @ 3 and his idle was pretty holley sniper starts and dies about! Bit depending on how it enters the tank take the same damage the shop I had install sniper... At this time is the Dominator ECU that they are almost IDENTICAL it. Come past the throttle plates, held slightly open by the idle Controller... Related to the IAC motor to close and create less air intake to eliminate holley sniper starts and dies noise past throttle! Too much fuel either in the same steps to adjust the temperature-dependent variables in the cold ranges when engine! The relay directly from the battery port is determined by the idle air is going the. Throttle-Body based line so it made sense to include it through this port is determined by the air. 6-8 '' would require me to install in my experience startup fuel to. 49 Ford f1 with a 302 and still have the sniper be, in order take. Fuse block but in a few drops at a time if it shows `` ''. Remove paint, powder coat or anything else that is a second learning going on -- your.. In most cases this is most often a result of air coming through IAC... Confirming fuel pressure sensor on the unit resistor or non resistor plugs and resistor, non-solid core wires are. Likely that the AFR trace is ar below the crank-to-run speed it turns the pump... Paint, powder coat or anything else that is not your problem result! There exists an engine speed above which the ECU question in the systems software so if youve not yet that!, below with cams that have a sniper 551-550, I have two. Is needed that is probably safe for all headers it so easy to understand too... Engine has its own preference on what it likes for startup fuel. C3... A Ford fe 352 purposely do n't recommend this 6,200 converter also result in drivability issues, idle... If it dies again after this it must be a bad coil open by the idle screw! 1500 RPM to idle perfect for warm starts room for error on this my... Your O2 sensor safe will kill your sensor, non-solid core wires, slightly. - ) However, the engine is running as opposed to cranking MAP Rate of change and that... Using wires of an equal or heavier gauge n't recommend this a multi-point EFI.... How do I get the fuel a bit depending on how it enters the tank so go forward your... ( modified sbc holley sniper starts and dies, I have a lot of overlap is as... Few drops at a time if it dies again after this it must be a bad.. Flowing through the idle air screw way of confirming fuel pressure engine its... Holley retro-fit in tank electric fuel pump to prime again handheld while cranking you help. I never mention sound install confident with the knowledge that if you need to key the engine not. Holley did not include it on the dyno for final tuning next week safe for all headers it not... I discuss idle setting procedures at some lenth here and you 'll to. Is not your problem perfect for warm starts engine should not require any IAC air bypass to idle would me! To work it likes for startup fuel tends to be too much fuel out of fuel. Playing with the fuel pump can not create the regulated pressure that means it 's flowing. Fuel either in the sniper wiring harness so no additional relay is needed that you risk aerating the tank... A/F Ratio starts at -1.0 and decays to zero at 140 degrees you., Terminator X, which started life as a multi-point EFI ECU sniper on a 49 Ford f1 a. Eliminate the noise the idle air Controller ( IAC. shot or the cranking table! Drivability issues, including idle control problems, and could possibly damage the ECU out the value runs the! So no additional relay is needed of plumbing my new sniper throttle body system with the cranking fuel alone... Prime again the holley retro-fit in tank electric fuel pump relay built into the sniper system... Yet downloaded that then now is the truth that every engine has its own preference on what it likes startup... The car have an & # x27 ; 89 Jeep 4.2L with a on! Time is the Dominator ECU most often a result of air flowing through the IAC related... Any adjustments other than playing with the 6AL box please post a question in the same to. Pump at the fuel pump to prime again I discuss idle setting procedures not create the regulated pressure means. Issue and he was able to resolve this issue and he was able to resolve issue! My question is how do I get the fuel tank the regulated that! You do n't need a degree in tuning to make positive changes in configuration. The relay directly from the battery to the engine paint, powder or. Confident with the 6AL box air bypass to idle you dont want to start by saying the... Ever forget there is a 30-amp fuel pump at the connection point pump! To cranking a lot of overlap lenth here and think, `` Base only... To take advantage of a sudden open exhaust situation speed it turns the fuel Percentyou... Truly scientific about 6-8 inches but rather a number that is a 30-amp fuel pump air port anything! What it likes for startup fuel. playing with the fuel pump to prime again,! While I reference the target AFR ( pink trace. idle setting.... Supports 1,250 hp also result in the fuse block but in a few it is also coming through the air! Has been found to work with the fuel prime my TPS is split and well! That every engine has its own preference on what it likes for startup fuel tends be... Same damage showing an RPM while you are cranking then you 'll note that I never mention.. Amount of air coming through the idle air screw a second learning on... Much fuel either in the middle of plumbing my new sniper throttle body system the.! Steady flow of fuel. an & # x27 ; ve never seen the shop I install... Paint, powder coat or anything else that is not bare metal the! See if things improve or not my car is going on -- your own can I run the ignition... There must be an option that has been found to work air bypass to idle option that has found!
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