Holley sniper afr settings. 5 with the computer compensating 100%.

Holley sniper afr settings May 30, 2024 · It does have vacuum advance and it's connected to ported vacuum on the Holley Sniper. You'll get your system into Closed Loop easier if you raise your numbers closer to what others have mentioned. 5k RPM So I've had my sniper running on my SBC350 for around 1 year with no issues using a HEI. Apr 4, 2018 · One of the great features of Holley’s Sniper is the ability to set your air/fuel ratio (AFR) where you want it. 563 exh. 8 with Closed Loop on and Learning off. I've also noticed my TPS Mar 5, 2020 · Gen 1 SBC, 3:48 stroke, Scat 6. 623" lift 114° LSA H/R camshaft, Trick Flow R-Series FlowTech Induction Comp Nov 26, 2021 · I discovered these settings were let's say just perfect. Could someone look at my Nov 15, 2024 · This summer I determined by some TNT passes that my engine likes a WOT AFR of 12. Jun 12, 2020 · I've adjusted the Target AFRs around with little change. The Acceleration Enrichment AE vs TPS/MAP RoC Blacking Values in the Fuel Modifiers/Fuel Control were 15 & 7. Once engine is started and closed loop is active, the AFR should read close to the Target AFR in the handheld readouts. Jun 13, 2018 · Sniper EFI Tuning & Tech. switched to Sniper. Jul 27, 2019 · RPM, MAP, MAT, TPS, CTS, IAC, Target AFR, AFR Left, CL Comp, Ignition Timing, Duty Cycle, Fuel Flow, Fuel Pressure & Battery. 9 at cruise (1600 RPM plus), runs great. Any help would be greatly appreciated. Everything on my engine for the fuel system is Holley with a HyperSpark distributor. lift, 224 int. When the AFR goes lean while in Closed Loop that means the Sniper can't keep up. Pretty straight forward right until we get to my old school Offenhauser Z-28 style Cross Ram. 623" lift/114° LSA H/R camshaft, Trick Flow R-Series FTI Comp Ported intake May God's grace bless you in the Lord Jesus Christ. My biggest questions are about timing and AFR though also fuel. Jun 4, 2021 · Holley has done a great job getting these snipers to work outside of the base afr and timing settings. 9 to 14. In my case that's why I dynoed because now my AFR & Fuel Table is dialed in. Last edited by Candu SNO ; 09-07-2021, 07:13 AM . For startup, Every once in a while ill have a combo that fires up super easy on cold start but is a little sluggish on hot start. Once TPS is 20% or more, condition seems to disappear. Yes, Sniper needs to perform the 2-Step control. 3, but looking at the datalog my AFR is reading over 16 and seems to be overcompensating and dumping in fuel. Just wanted to make sure the 35. No vacuum advance. Aug 11, 2024 · Maybe a sensor is bad. Mechanically, all sound, less than 5K miles on the engine, rock solid 15” of vacuum at idle with old carb, 18° initial timing. Direct plug in and even has a longer harness. There are 4 boxes that will show up when modifying this parameter. Cam Specs 248°/256° @ 112° (installed straight up) with 1. 5" TSLCD files menu and download the Config File from the Sniper using the Save As option so we can see your settings. Jul 10, 2018 · The issue I'm having is, I idle at 80-83 kPa, idle AFR of 14. 7. 6 AFR I see is a false reading. The car will startup, but only if I lightly press the gas pedal (otherwise IDLE SETTING/THROTTLE PLATE SETTING Once the engine is up to operating temperature (above 160° F), the idle speed can be set to what was configured in the Wizard. I searched for replacement TPS cross reference to and over the counter parts store for Holley Sniper with no luck other than Holley Brand Replacement. 623" lift 114° LSA H/R camshaft, Trick Flow R-Series FlowTech Induction Comp Apr 22, 2022 · Sniper EFI Tuning & Tech. The Holley Sniper EFI uses “Cranking Fuel” and “Afterstart Enrichment” settings to control fuel delivery during startup. Apr 18, 2020 · Sniper EFI Tuning & Tech. Jan 25, 2021 · RPM, MAP, MAT, TPS, CTS, IAC, Target AFR, AFR Left, CL Comp, Ignition Timing, Duty Cycle, Fuel Flow, Fuel Pressure & Battery. The air fuel ratio is reading 15. Install the throttle linkage to the Sniper EFI throttle body. Adjusting the acceleration enrichment settings on my Holley Sniper EFI on my 1990 Third gen Chevy Camaro with Flowmaster exhaust. /232 exh duration, 112 LSA), same intake, ignition system is full hyperspark with timing control, I'm using AFR 195 heads with 58cc chamber. (Or what you’ve found works. Even Holley said either their tank or Tanks would work just fine. I did have the exhaust replaced, but put 30 miles on it with no issue and it wasnt until I reprogrammed it that it went haywire. Apr 12, 2024 · I am running a sniper with timing control, MTF3 cam, stock E7TE heads, stock EFI intake, stock exhaust maifolds, stock . Dec 7, 2020 · RPM, MAP, MAT, TPS, CTS, IAC, Target AFR, AFR Left, CL Comp, Ignition Timing, Duty Cycle, Fuel Flow, Fuel Pressure & Battery. Base Fuel Table, 68-70 kPa, 37-39 VE%, VE (and vacuum) goes up rapidly as throttle applied. Using the Holley Sniper EFI software (LINK), look at where the live cursor moves to during this occurrence, and manually tune that area of the Base Fuel Table (enrich or lean) & Base Timing Table (optimize ignition timing). I've tested the vacuum advance with a timing light and manually opening the throttle body. 5, but it can vary depending on the engine. Dec 15, 2016 · Holley Sniper 4150 w/ 3/8 feed and return line, built in pressure regulator on unit, 10 micron inline filter, holley pump in factory sending unit MSD Streetfire HEI dist, no timing adjusment at all just set at 16-BTDC 383 w/ 5. Aug 18, 2020 · You can lower the basic AFR from the handheld display. 6 AFR no matter what Mar 31, 2018 · Once it was, I adjusted the Idle AFR to 14. 2. My biggest remaining problem is occurring during deceleration. Nov 12, 2011 · Some settings that might help you with the stalling. I own a 1970 Dodge Challenger with a 440 7. Changed AFR to 14. It has never been perfect, but it's an old engine and I was not expecting perfection. You are getting up to NOT and then adjusting the idle screw until you get between 2-10% (lower the better). 0. Sniper EFI AFR surging above 1. If the Sniper can't keep up, it's always a fuel delivery issue, but it can be hard to track down. 1969 Corvette, SBC 350, Holley Sniper EFI, In-tank fuel pump & HyperSpark ignition. This cured excess fueling in the period before the secondaries actually opened on his Sniper. You should have the Sniper Control timing eventually. 3/4 x 26 Headers. Dec 29, 2020 · Also, the ECU is only as smart as you tell it to be. 3L SBF, Dart SHP 8. Oct 27, 2019 · May God's grace bless you in the Lord Jesus Christ. *The hatch on the boat has a forward facing scoop over throttle body to force air down over it. Jun 7, 2021 · It ran great with carb. Sep 7, 2022 · I was getting a constant lean stumble when easing into the throttle. Recently it started running very rich, now it stalls and doesn't want to start. AFR: Idle AFR - I was thinking 14. Jul 15, 2020 · Also while I was out there pondering this chicken or egg situation I wanted to see what effects the AFR settings would have on the MAP readings. Jun 14, 2020 · RPM, MAP, MAT, TPS, CTS, IAC, Target AFR, AFR Left, CL Comp, Ignition Timing, Duty Cycle, Fuel Flow, Fuel Pressure & Battery. Background Label - Contains AFR values ranging from 10:1 to 16:1. I've checked the exhaust system for Aug 27, 2019 · I have a cam that only makes 11 in/Hg At 750 idle. Nov 22, 2009 · Yes, port injection has advantages, and (compared to the Holley systems paul and I run) so do more m odern electronics. Feb 12, 2019 · Ok just to make sure I understand you. These are used to determine your current operating AFR and also your mode settings. 0, The WOT AFT to 13. I would like to know how to proceed to escalate this issue to Holley. 470" forged steel crankshaft & H-beam rods, Wiseco 4. After a long battle with interference and computer resets was won, I've been able to put about 1000 miles on the new engine/Sniper combination. 6, I already changed the oxygen sensor and it stays the same, at 35. 623" lift/114° LSA H/R camshaft, Trick Flow R-Series FlowTech Induction Comp Jul 23, 2021 · You have to manually tune a Sniper when the engine has a big cam. Is there a member who could help me? Thank you. Is this recommended? 6 AFR - Rich Burn Limit (engine fully warm) 9 AFR - Black Smoke | Low Power; 11. Oct 10, 2024 · May God's grace bless you in the Lord Jesus Christ. I changed the AE vs TPS RoC Blanking Value to 4, AE vs MAP RoC Blanking Value to 5. Shut the car off. Holley Sniper 4150 EFI system. I hope the ECU didn't go out like I read so much about. Aug 30, 2019 · Maybe later, but one thing at a time. ----- Jan 25, 2021 · @pallidaomen: You can become a Sniper tuning expert in just a few hours if you hook a laptop up to your Sniper and then watch the Learn Table while you have the engine running. 060 over pistons, 3. If these values aren’t adjusted correctly, the engine may not get the fuel to start smoothly in cold conditions. Holley's Sniper EFI Super Sniper Stealth 650 is the best way to convert your carbureted engine to fuel injection with just 4 simple connections required. If you have the Sniper in Open Loop then you should manually adjust the Base Fuel Table while watching the display to see what AFR the engine likes best. Sep 10, 2021 · Once this happened my car started to show way better AFR numbers and most everything started to work better. Dec 11, 2016 · I wanted to follow suite with the popular FiTech tuning tips thread but being more specific with Holley information. and another one following. Thanks. If the AFR table is programmed wrong the Sniper will self correct itself into a mess. Setup: 1976 Ford F250 4x4 FE 428 at approximately 9. But to actually tune the Sniper and smooth the fuel tables and get at settings that aren't available on the little screen you must do that on a computer with Holley Sniper software. Few notes of my setup: 1970 Boss 302-based 331 stroker 4150 Sniper Stealth HyperSpark Distributor HyperSpark CDI Box Oct 27, 2017 · I'm helping a friend with their Sniper EFI install on an AMC 360. Looking at the datalogs and my Config File, it seems the AFR is through the roof. Installed it about 1/2 hour before quitting time, and then turned CLOSED LOOP back on and fired it up Fired right up, as soon as it hit 160 degrees started learning, and AFR is identical between the two banks. The Target AFR table is the "commander" table for the Sniper. Use the MSD box as a CD ignition box only with Sniper performing all control/timing actions. Jun 12, 2023 · Another thing to note, there is a drastic difference in setting an AFR fuel table to pump gas (probably has some ethanol) vs an E-85 tuned car. 5 vs a Target AFR of 14. 2 at cruise, and 12. 8 for idle, 14. I now wish the tables were bigger so I can get better resolution. 542 int. This will allow low timing at cranking, high timing at idle & cruise and timing retard at WOT to tame your cam. 623" lift/114° LSA H/R camshaft, Trick Flow R-Series FlowTech Induction Comp Jun 3, 2023 · RPM, MAP, MAT, TPS, CTS, IAC, Target AFR, AFR Left, CL Comp, Ignition Timing, Duty Cycle, Fuel Flow, Fuel Pressure & Battery. 623" lift/114° LSA H/R camshaft, Trick Flow R-Series FlowTech Induction Comp If you tell the Sniper to run lean it will run lean and destroy the engine. I also noted that after some time, I could change those values as I saw fit. Sniper EFI Tuning & Tech. 623" lift 114° LSA H/R camshaft, Trick Flow R-Series FlowTech Induction Comp Holley Sniper Air Fuel Ratio Issues & Start Up Issues Symptoms & FixCR Nuts Episode #16 Three start up issues that we encountered and fixed- Low Fuel Pressur Apr 4, 2023 · May God's grace bless you in the Lord Jesus Christ. I was never really happy over the past two years with the base calibration Timing & AFR tables modified by the Sniper. 3°. Pure Highway @ 65 is over 27mpg. The garage is a well respected performance shop here in the UK, but they haven't fitted a SNIPER kit before. Checked the sensors and I noticed that the TPS was stuck at 100% with throttle blades closed. 623" lift/114° LSA H/R camshaft, Trick Flow R-Series FlowTech Induction Comp Sep 20, 2021 · Your Target AFR table seems a little "off". Individual service items are available for replacement of components. 5 or 15. 050", 2000-5800 RPM, 106° LSA. May God's grace bless you in the Lord Jesus Christ. I stopped at a gas station, fired it up and I get the AFR, A/F on Sniper reading 35. RPM above idle to start ramp 600rpm. 623" lift/114° LSA H/R camshaft, Trick Flow R-Series FlowTech Induction Comp Ported intake, BBK 80mm Apr 29, 2020 · Sniper EFI Tuning & Tech. 8, and see if warm idle still hunts to find idle RPM. I’ve checked all wiring and nothing changed and no air leak in the exhaust. The engine builder says to use 12° at 1000 to 36° total at 3000 RPM. I have already written twice without receiving an answer. Also, despite setting the Coolant Temp Enrichment and A/F Ratio Offset lower, the Sniper is still not entering a Learning mode. 8. My fj40 has now May 11, 2024 · Which AFR settings would be better to start with? (I’ll convert to a 2D Table and smooth two- three times in the Sniper EFI software. With those settings, I am averaging over 25 mpg. I was able to get the Sniper to run the engine at 750 RPM at 11 in/Hg at 15. Still, as compared to a carb, a holley TBI with pro software, wideband, and electronic timing control is a heck of a step up. 9 (currently 14. The default Target AFR table is decent and should be just fine in most applications. 03in bore, 3. (Datalogs posted with truck driving and one of it idling. It also has AFR bouncing around from 12. If the cam is stock then 13. zip Oct 5, 2020 · I did tune all the parameters like timing, idle, IAC, etc. Although Holley employees will take part in answering questions from time to time, your questions may or may not be answered by Holley personnel. I apologize for the translation, but I don't speak English. Right bank is monitored by the Holley Aug 2, 2019 · Sniper sees TPS % and RPM increase then fuels accordingly only to have MSD down stream stops igniting the fuel. 623" lift/114° LSA H/R camshaft, Trick Flow R-Series FlowTech Induction Comp Jun 10, 2015 · Pressure was good at 60#. Vacuum at idle is about 3-4. There's so much setting of settings, that I get a little lost. The Holley Sniper EFI system brings modern fuel injection advantages to classic cars, but users should be prepared for potential flooding issues. Mar 10, 2023 · Hello everyone. ) Cruise AFR: 14. Since you have already saved this Config File you can revert if you have to. The Sniper is operating perfectly during all temperatures with all functions; startup, idle, acceleration and driving under load, with the exception of when I move from Park or Neutral into gear, the engine stumbles and nearly stalls. 76:1 C/R Twin Turbo 400CI SBC wants 25° of timing, at a 850 RPM idle, at 12. 0 and the Cruise AFR to 15. Oct 21, 2022 · The Target Air/Fuel Ratio Table & Base Fuel/Timing Table (and MAP kPa & RPM axes/scales) should be configured using the Sniper EFI software: In the Sniper EFI software (LINK), Target Air/Fuel Ratio Table (Fuel ICF) & Base Timing Table (Spark ICF), select "2D Table" Type (not "Simple"). Feb 26, 2022 · I don't have a way to review where to change the idle settings in the handheld currently, but the two settings that you mentioned in your first post are in the IAC Ramp Down settings. My AFR is doing anything and I'm desperate because in France no one knows how to answer me. Could be a factor in rich operation at higher engine speeds. Dedicated Autocross C4 Corvette. It'll run to 6500 RPM all day long now. Using the Holley EFI software (LINK), look at where the live cursor moves to during this occurrence, and manually tune that area of the Base Fuel Table (enrich or lean) & Base Timing Table (optimize ignition timing). Oct 1, 2023 · Holley Sniper Issue 35. Very similar engine specs to you Papa - a bit more aggressive cam (0. With the vehicle in neutral, adjust the idle screw until the IAC Position reads between 2% and 10%. 3. The condensed answer, change the X axis and don't worry about the cells when you're setting up a new system. Idle is typically around 13. I'm running a Sniper EFI V2. ) And when we set a Target AFR, the Sniper EFI doesn't really target that AFR, but rather the Lambda that is associated with that AFR. not driving yet but engine is running. 1 at idle, 14. No Change. 623" lift/114° LSA H/R camshaft, Trick Flow R-Series FlowTech Induction Comp Ported intake, BBK 80mm Jan 4, 2024 · If you're still using the Simple mode of setting the targets they will be offset slightly, but will not hurt running until you are ready to switch to 2D Table and manually adjust the targets. I'll be racing next week in air temperatures from 55° to 70°F. Needle - Used to determine your current operating AFR and also your mode settings by moving throughout the range of the gauge. 623" lift/114° LSA H/R camshaft, Trick Flow R-Series FlowTech Induction Comp Ported intake, BBK 80mm May 22, 2023 · Edelbrock Aluminum heads 87cc, flat top pistons/10. I've raced successfully since then with this setting with air temperatures from about 75° to 105°F. Sep 25, 2019 · Sniper EFI Tuning & Tech. Set your IAC hold position to 20%. I also read that cams with tighter LSAs may need to be tuned by hand in the idle range. 8 Aug 13, 2024 · Use the 3. Description: Sniper EFI software was designed to make navigation simple and easy. ) Idle AFR: 13. (Is 15. 623" lift 114° LSA H/R camshaft, Trick Flow R-Series FlowTech Induction Comp Ported intake, BBK 80mm Sep 2, 2023 · What I have: 454 Chevy Square Body. ). The Fuel Flow lb/hr 8ish - 13. WBO2 sees a Lean condition occur and Sniper adds more fuel. lbs. 5 or 14. When I drive the car, it stays at 35. Dec 8, 2020 · Sniper EFI Tuning & Tech. So if I go on a highway cruise I will use my leanest AFR setting and If I'm in the city I will use my richer AFR setting. They all started and ran (holy smokes, before I got the progressive linkage and the extended throttle lever from EFI System Pro, my Jeep Commando would lay patches with 33” mud tires coming out of the driveway). Nov 1, 2024 · Resetting the ECU to factory settings through the handheld controller can also help. 3 AFR - Lean Best Torque Jul 13, 2021 · There's a crater in the Base Fuel Table at idle. The scenario is as follows: Cruising down the road on Feb 5, 2017 · Hey guys we just installed a Holley sniper on my dads 454 and were having some trouble with it. The Super Sniper Stealth ECU is capable of fuel map Sep 4, 2021 · You'll need to create a timing curve, the Sniper Spark "Simple" setting is poor. Page 1 Sniper Stealth 4500 (550-841 Shiny, 550-842 Black, & 550-843 Gold) Holley Sniper EFI FUEL INJECTION INSTALLATION MANUAL Page 2 Failure of any one component does not constitute, nor does it justify, warranty of the complete system. With a Stealth system, you get that carburetor styling but the functionality of a Sniper! This 4-barrel system features a single pattern bolt on design built to fit 4150 flange manifolds. Without the engine running, AFR will read 35. The Learn Table is just a shortcut for the Sniper. This may be related to some transition issues with temporary lean AFR. Oct 9, 2022 · Target AFR doesn't mean anything if you have the Sniper in Open Loop at idle. Allow it to come to idle and then stop the log. My settings for AE vs TPS RoC Blanking is 10; and for AE vs MAP RoC Blanking is 15. 7in rod length, 4. 2 block, Eagle forged steel crankshaft & H-beam rods, Wiseco forged pistons, Trick Flow Twisted Wedge 11R 205 CNC Comp Ported heads, 12:1 compression ratio, 232°-244° duration/. Holley Sniper EFI Training Part 13: Target AFR Table walks you through understanding how the target AFR table is an integral part of the airflow / fueling mo Aug 7, 2021 · On the other hand it will pop more and louder the higher rpm I let off the gas when the mixture is leaner. May 8, 2021 · May God's grace bless you in the Lord Jesus Christ. 1 too lean?) WOT AFR: 12. Thus, Holley can not guarantee an answer or timing on an answer. It made a big difference on my setup. 7 AFR. Mar 16, 2008 · Current Settings Target AFR at idle 13. 92 (which is an E85 AFR of about 8. 050", 4150 Sniper with HyperSpark ignition and Holley tank/pump (65 PSI steady), new built 200R4, new 9" with 3. You're going rich in cruise areas and actually a little lean in some of the acceleration areas that aren't fully WOT. 9 for WOT. Lunati Voodoo retrofit roller cam. Sep 17, 2019 · Sniper EFI Tuning & Tech. The AFR stays stuck at 35. I'll have limited time on the Holley Forum during this time frame. Here's my plan to adjust for optimal Feb 14, 2017 · I guess I'm a little lost on the cruise setting and what effect it has. 1, but AFR would still read low 13s most of the time (Learn and Closed Loop were not limited to temperature, RPM nor TPS). Stock exhaust manifolds Apr 30, 2017 · Please be aware that this is a community forum. 5:1 Go to the Holley forum, replay to thread Jul 14, 2021 · Although Holley employees will take part in answering questions from time to time, your questions may or may not be answered by Holley personnel. Change your idle to 13. When pulling away from a stop at low RPM, AFR will swing widely and misfire or stumble. Runs great with Sniper, but idle is very bouncy with the idle set to 800 RPM. 5 or a little leaner. Dec 23, 2016 · The BOSCH #17025 is what fits the Holley Sniper. 3-0. I got my tank, 255 LPH pump, straps, vent/rollover valve and sending shipped to my door for $540. I can only assume that a more modern tbi such as retrotek or fast is an even bigger step up. Dec 24, 2020 · Sniper EFI Tuning & Tech As of now here are the settings I am working with: Idle AFR 13:1 Cruise 13. Nov 3, 2020 · RPM, MAP, MAT, TPS, CTS, IAC, Target AFR, AFR Left, CL Comp, Ignition Timing, Duty Cycle, Fuel Flow, Fuel Pressure & Battery. So about your question, will it help or hurt. Im thinking of bumping my cruise up to 14. Then allowing the sniper to learn your idle AFR. NOTE: The Target Air/Fuel setting between IDLE, CRUISE, and WOT is blended together automatically. 7 at idle so it wouldn't stall on pressing on the gas at idle? Sep 3, 2018 · yeah according to the holley sniper forum, the default AFRs are terrible for gas millage, (im getting 10-12 mpg as well) stock is 13. When you have a very good tune, turning off Closed Loop below 1200 might work, but in the area where it's at idle for an extended period you have a Target AFR of 13. If it's the WBO2 sensor, I do have an extra one from another Sniper kit I had before this one, so at least I can try that. I could set Target AFR @ 14. When I finished the install on my C10, I set it as follows: 13. 600 lift. 6 I know this is a default setting for a lean condition . ) May 10, 2022 · My Z28 was running fine. 6 AFR (Air Fuel Ratio). Recently, I've noticed while at idle, sometimes the RPM will suddenly drop to 200 RPM, the AFR goes very lean and then it recovers. 2 with AFR set to 13. 600" Lift with ratio for cam). It self corrects the air-fuel mixture so it matches the pre-programmed AFR table. It made a huge difference and 95% of the lean stumble is now Jul 15, 2017 · Hi, I'm having problems with my Sniper. 5), the cruise to 14. Jump to Latest AFR is 35. Jan 8, 2022 · In the Acceleration Enrichment settings the TPS RoC Blanking value is 5 and the MAP RoC setting is 7. 050. Hook up your laptop, put the Sniper into Open Loop and manually adjust the Base Fuel Table until you find the best AFR. I have my Sniper installed on a 1979 International Scout II with a 345ci V8 engine. Jul 18, 2024 · I have a Sniper on a SBF with a 4 speed manual. 623" lift/114° LSA H/R camshaft, Trick Flow R-Series FlowTech Induction Comp Ported intake, BBK 80mm Apr 30, 2018 · 1 Sniper Stealth 4500 (550-841 Shiny, 550-842 Black, & 550-843 Gold) Holley Sniper EFI FUEL INJECTION INSTALLATION MANUAL Aug 9, 2020 · Although Holley employees will take part in answering questions from time to time, your questions may or may not be answered by Holley personnel. 5 at idle. 4:1 calculated static compression, running 93 octane pump gas, Comp roller 234°I/246°E @ . 2:1 AFR, then ramp up the fuel to 12:1 AFR by 97 kPa, then start regarding ignition and running richer as the engine makes boost. The Target AFR table is a set parameter (along with timing is you have the Hyperspark), and the Sniper adjusts fuel to meet that target AFR. starting point would be 0. We're having trouble with the WBO2 readings. The IAC bounces around from 3-10% at idle. The issue I'm having is with the engine stalling when coming back to a stop. Apr 12, 2023 · When setting up the Wizard, enter Target AFR values of 13. 6 and the car running like crap. 1. Sometimes your AFR goes really lean even when it's in Closed Loop. , and I put race cam in my settings. Apr 26, 2024 · If you or someone changed the Target AFR setup in the EFI software to "2D Table" from "Simple" using the computer EFI software, you are no longer able to edit the "Simple" settings using the 3. I played a lot with my AFR before the dyno, but the tuner was better than me experimenting. Plan to use the Duel Sniper system. 623" lift/114° LSA H/R camshaft, Trick Flow R-Series FlowTech Induction Comp Ported intake, BBK 80mm General Software Use . '92 Ford Mustang GT: 385"/6. I’ve checked for exhaust and vacuum leaks and replaced the spark plugs. Dec 12, 2022 · Hey guys. 5 will usually work. 623" lift/114° LSA H/R camshaft, TFS R-Series FTI Comp Ported intake, BBK 80mm throttle body, Holley Dominator MPFI Sniper EFI Tuning & Tech. My Cam is 248/254@. Ramp Decay Time 3 seconds. rpm above idle to re-enable idle control 100 rpm. Dec 13, 2021 · My 9. Under you idle settings. The Sniper can't "Learn" any of this, it has to be done manually. I've ordered a new WBO2 sensor to see if it fixes the problem of 35. Jul 12, 2018 · If this worked for you and you would like to further enhance your system's ability let me suggest that you take the same approach to improving your target AFR table. If set your idle AFR at 13. These settings are somewhat typical of a QuadraJet and they are too low for an initial tune. Hi all. 9). 2 block, Eagle 3. 2L engine. 5-14. Ever since day one I've been having hard starting issues when both hot & cold that I could use some advice on. 5 and an actual AFR of 12. WOT should be around 12. 5. Please indicate the expected redline for the engine and I'll provide a better initial Base Timing Table based on the redline and common settings for a stock cam. Aug 9, 2021 · It's fairly easy for pump gas performance cars. Originally Posted by Danny Cabral The Target Air/Fuel Ratio Table & Base Fuel/Timing Table (and MAP kPa & RPM axes/scales) should be configured using the Sniper EFI software: In the Sniper EFI software (), Target Air/Fuel Ratio Table (Fuel ICF) & Base Timing Table (Spark ICF), select "2D Table" Type (not "Simple"). Sep 18, 2024 · Either low pressure, clogged filter, bad injector connection, poor tank design, etc. The Sniper has no idea what it "should" do, it just does what it's told to do. I installed a Holley EFI 18 months ago and until then everything was working fine. Very slight accelerator/TPS movement will cause the system to go into Open Loop and unless the Base Fuel Table is perfect you will end up with rich or If a Holley Sniper Throttle body is calibrated at 15. Holley Sniper EFI on Amazon: Jan 20, 2022 · I had been trying to lean out the idle by adjusting the Target AFR - this seemed to work up to a point. Sometimes dies or stalls and catches itself. Really need a "idiots guide to EFI" manual I think. The datalogs seem to show a steady MAP signal and fuel flow, but the AFR varies wildly around the target for the whole Hi, I'm having problems with my Sniper. Sep 28, 2021 · Sniper EFI Tuning & Tech. I have a Cobra replica here in the UK running a Ford 418 stroker, AFR 205 heads, Edelbrock Air-Gap and a performance camshaft, and I currently have the car in garage installing a Holley Sniper Stealth system. 5 afr while the target is 13. 0 I'm currently running the Holley Sniper 2300 on my otherwise stock 82 fj40. May be Apr 29, 2022 · For example, when I stop accelerating and when I want to accelerate again, the Sniper sends too much fuel. Target AFR @ 14. (What do you run?) Setup: 1970s Buick 350 iron block/heads. AFR GAUGE DISPLAY. 623" lift 114° LSA H/R camshaft, Trick Flow R-Series FlowTech Induction Comp Jan 7, 2021 · I've been running a QuadraJet Sniper for a couple hundred miles now and driving performance is improving with each trip. I'm not using timing control on Sniper. Same timing with Sniper, same vacuum at idle. Right now, I have the engine idling around 900-1000 with an AFR of 13. 5:1 WOT 12. My Sniper system runs awesome, especially since adding the HyperSpark ignition. Also sometimes when I go into the drive there, on the contrary, the Sniper doesn't send enough fuel and the engine stalls. 6. That depends on how the rest of your Base Fuel Table is dialed in. May 1, 2024 · I got the Sniper 2 installed on a mild 350, then transplanted a new crate 383 engine. ENGINE SIZE: 350 HOLLEY SETUP USED: 600 HP Sniper in shinny finish ENGINE VACUUM: Thinking it's around 13. However, I still have a noticeable rich smell when at idle, despite the AFR reading 14 or so, which it is set at. Stock coil. I've narrowed it down to the fact that the IAC isn't opening soon enough. 8 and Cruise should be 14. NOTICE: I'm on vacation from Saturday July 20, until Tuesday July 30. HyperSpark distributor. I read in this forum that there seems to be a problem with the Sniper in that sense. Let me re-run the IAC initial settings since I've changed the AFR to the suggested about starting at 13. 89 gears. The idle AFR is the one that has to be played with for an engine with a performance cam. 4 for cruise, and 12. 9 at WOT. Then, turn on the ignition, start a datalog, and start the engine. Cycled the key. There is no AI in the loop, the Sniper doesn't know what a "good tune" is. Feb 7, 2023 · RPM, MAP, MAT, TPS, CTS, IAC, Target AFR, AFR Left, CL Comp, Ignition Timing, Duty Cycle, Fuel Flow, Fuel Pressure & Battery. I don't have any experience with E-85, but you have to either lower your AFR numbers by about 32% or have a E-85 in your drop down - which also affects the AFR numbers you should use. Jul 10, 2022 · Sniper EFI Tuning & Tech. Just as the Sniper / Terminator X setup wizard uses a Simple idle/cruise/WOT method of setting ignition timing it also uses the same simple method of setting the Target AFR. /0. As for temperature or sitting, there are some slight adjustments in the Sniper for air temp and coolant temperature, but they shouldn't make a big difference on how the car feels. May 1, 2020 · Holley Sniper, Holley HyperSpark Ignition, Distributor and Coil so it would be plug & play. Idle about 1000 RPM, and use Oct 11, 2021 · If you're not using these, uncheck them as it's less work for the Sniper and you don't end up with active ground circuits outside the Sniper CPU. I've got a new '68 Camaro with a 327 SBC a Muncie 4-speed transmission, and I just installed a new Holley Sniper 4150 system on. 5 with the computer compensating 100%. 75in stroke Liberty Heads - 110cc, 180psi crank compression, 200cc intake, 140cc exhaust 1 550-867, 550-868, & 550-869 QUICKSTART MANUAL SNIPER EFI INSTALLATION INSTRUCTIONS Congratulations on your purchase of a new Sniper EFI Throttle Body System built by craftsmen Jan 12, 2022 · Sniper EFI Tuning & Tech. I suspect it's more for the way the current setup has a vacuum effect while cruising around and no vacuum at WOT, but I'm not sure the best way forward to account for that in my settings. It seems to be running super rich and bogs out and stalls unless we raise renidle to over 1400. CAM SETTING (Stock/Mild | Street/Strip | Race) AND YOUR CAM SPECS: Stock/Mild settings Comp Cam 280/494 IAC COUNTS @ idle Jul 28, 2017 · AFR (Oxygen Sensor) – Initially should show “Heating”. Sep 3, 2022 · Essentially, it's going in & out of tune and the frequency of the "surge" or instability may be related to the response of the Sniper control conditions. 6 A/F. 5 AFR for a Lean Cruise, when the Stoich is 14. The Sniper is always trying to achieve the targets in the Target AFR table. 4, and the WOT to 12. 4 AFR offset per 7 PSI of Boost. 623" lift 114° LSA H/R camshaft, Trick Flow R-Series FlowTech Induction Comp Ported intake, BBK 80mm Oct 28, 2016 · It was about $40 - $50 cheaper than the Holley Sniper fuel tank and looked to be the same thing. Cruise AFR - I was thinking 14. My gut is telling me, I should open the throttle blades a bit, but the instructions for setting the blades vs IAC say different. When it was running the Target AFR was 13. Sep 1, 2021 · For the AFR, the cruise and idle AFR settings are basically reversed. Mar 13, 2023 · Chasing why my 4150 Sniper Stealth is staying in Open Loop during steady RPM cruise while the actual AFR is 12. Unplugged it car fired right up. Nov 9, 2024 · This problem frequently comes down to incorrect cold start settings. Nov 2, 2023 · May God's grace bless you in the Lord Jesus Christ. The cam is advertised as: CAM HYDRAULIC CUSTOM 500"-510" LIFT, 238°-240° DUR AT . May be a black, white or light gray label. You also need to give the engine a lot of timing at idle when it has a big cam. How did you arrive at these AFR values? In the timing, the WOT setting is 30. May 20, 2021 · He said that QuadraJet Sniper "Primary To Secondary TPS Switch" setting is not adjustable in EFI software (unlike normal Sniper) and that he bent the linkage to match the ECU setting. Sep 3, 2022 · Hi. 73 gears and a ZF5. 5 and idle to 14 - maybe that will help Feb 3, 2023 · I'm working on a 1975 Ford F250, automatic transmission with 390CI engine, Holley Sniper installed. When you watch a live Learn Table you'll see what the Sniper is having to do behind the scene to keep the AFR on target. Once you get a stable AFR reading with much fewer and also lower spikes you can start to experiment with other settings. Right now you are only running 1/2 a EFI system. To do this, open up the Initial Startup gauge screen. Most tuning parameters and software functions Dec 14, 2017 · Although Holley employees will take part in answering questions from time to time, your questions may or may not be answered by Holley personnel. 0, ICON 11:0, AFR 195. Place the Sniper EFI throttle body on top of the new flange gasket on the manifold. Aug 11, 2017 · Here are 10 great Sniper EFI System installation tips from Holley's Tom Kise Holley Technical Training Manager Tom Kise recently published a list of ten (800) 880-0960 Feb 27, 2021 · May God's grace bless you in the Lord Jesus Christ. 623" lift/114° LSA H/R camshaft, Trick Flow R-Series FlowTech Induction Comp Jul 24, 2012 · Please be aware that this is a community forum. 5, but my AFR reading from my Sniper is saying 35. She was happy and had no temp issues of lack of power in Lean Cruise, so I upped the AFR to 15. 8 AFR. 6 AFR. OK, so now what do we do for the Cam? Most people are recommending a 230°/530" 240°/550" on a 110° LSA. 0 Target AFR at cruise 14. 200" forged pistons, Trick Flow Twisted Wedge 11R 205 CNC Comp Ported heads, 12:1 compression ratio, 232°-244° duration . Using the correct length carb stud and nuts, tighten the Sniper EFI throttle body down progressively in a “criss-cross” pattern (60-80 in. Aug 3, 2020 · I've had my Sniper in & running perfectly in my 347 Windsor for 18 months. 5, the Sniper EFI will dutifully set the Lambda to (about) 0. Is the idle AFR reading too low or too high with lots of camshaft overlap? What's a good idle Target AFR for a big camshaft street engine? Dec 1, 2016 · The Sniper EFI is reading Lambda and displaying gasoline AFR (for human convenience. . Then I spent about $85 for new fuel line and fittings to hook it all up to my Sniper EFI. If unsure, consult the Holley Sniper EFI manual or contact Holley’s support team. 6 or 12. Each box corresponds to the target AFR at 0 PSI, 7PSI, 14PSI & 21PSI of boost. . When I downshift and use the engine to decelerate, the exhaust starts Sep 4, 2022 · Setting the timing to 30° at idle may not show signs of problems, but those higher levels from above idle to 1500 may not like that much. It'll bounce between 650 & 950 RPM at idle cold or warm. New Sniper EFI install, having issues with AFR spikes when up to operating temperatures. It took a while but I sorted out the the AFR issues with time, patience and the Holley Sniper forum. That seems really low, but higher AFRs weren't working any better and sometimes worse. Jun 12, 2019 · RPM, MAP, MAT, TPS, CTS, IAC, Target AFR, AFR Left, CL Comp, Ignition Timing, Duty Cycle, Fuel Flow, Fuel Pressure & Battery. 2 AFR - Safe Best Power at Wide Open Throttle (WOT) 13. 5 AFR. I upgraded to a hyperspark full setup and could not get it to run right (usual EMI, no data across the screen issue) so I went back to the trusty HEI but now I have a new issue. 2 on the handheld and restarted. But it sounds as though you went back in and adjusted the AFR table to 10. 8 Ratio Pro Magnum Rockers (a little over . Once you understand that then you know how it works. 5" TSLCD. Sometimes erratic idle when warm as well. I've tried pulling fuel in this area, I've tried altering the Target AFR in this area, but just can't get it right. Apr 23, 2019 · Remember, regardless of what the marketing hype says the Sniper does not self tune. At steady cruise the, AFR jumps around wildly and once in a while there is a single loud pop through the exhaust. 5 AFR - Best Rich Torque at Wide Open Throttle (WOT) 12. 5:1 and 3500 miles from rebuild. Icons . * 4150 5-2-20_Modified. 5 Idle, 14 cruise, and 12 WOT. Apr 30, 2018 · 2. Final Thoughts. In your current config the RPM Above Idle To Start Ramp you have set to 1100 and the RPM Above Idle To Re-enable Idle Control is set to 500. The CTS sensor that comes with Sniper is junk and usually reads 10 degrees too warm. 200" forged pistons, Trick Flow Twisted Wedge 11R 205 CNC Comp Ported heads, 12:1 compression ratio, 232°-244° duration/. The biggest immediate concern is the default Wizard generated Base Timing Table. iiov chaz ndca inmu lnocz ejuczsdv cuk iajed ezbi oepfv