Target Air/Fuel Ratio Graph Layout

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  • 438wStang
    Member
    • Jan 2016
    • 51

    Target Air/Fuel Ratio Graph Layout

    I finally got some time to mess around with my car this weekend, but before I do so I want to see if there are any changes I should be making to my Target A/F Ratio table layout. I had a base tune sent to get the car started, etc., but I seem to be having issue with carbon fouling plugs on every cylinder just after a short drive or idle time. I've checked for leaks and did not find any. I've since swapped to a hotter plug and have been told to work on my Target A/F Ratio and lean it up a bit idle/cruise. Question is what kind of blending should a good table look like? I know all engines will like different layouts. Included are the base tune Target A/F Ratio and one I just started messing with. Just looking for feedback, thanks.

    This is the original base tune AFR table:
    Click image for larger version

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    This is the one I just started playing around with:
    Click image for larger version

Name:	Modify afr.jpg
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    I haven't ran the car yet with the hotter plugs. Original plugs were NGK R5671A-9. Now installed NGK BR7EF.
    Last edited by 438wStang; 07-20-2019, 03:11 PM.
  • Danny Cabral
    Administrator
    • Dec 2009
    • 35959

    #2
    That's not the "Graph", that's the Table. Just program the Target Air/Fuel Ratio Table numerically, then blend the Graph smooth.

    EFI Software Help Information/Instructions:
    ‒ On the top Toolbar, click "Help" & "Contents". This opens all Help topics.
    ‒ When navigating the software, click "Help ?", drag it to any parameter and click again.
    ..This automatically opens the definitions for that specific parameter.
    ‒ Tuning information can be read by clicking the F1 key, when you're viewing any screen.
    http://documents.holley.com/techlibrary_199r10544.pdf (Holley EFI Help/Instructions Overview)
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385"/6.3L SBF, Dart SHP 8.2 block, Eagle 3.470" forged steel crankshaft & H-beam rods, Wiseco 4.200" forged pistons, Trick Flow Twisted Wedge 11R 205 CNC Comp Ported heads, 12:1 compression ratio, 232°-244° duration/.623" lift/114° LSA H/R camshaft, Trick Flow R-Series FTI Comp Ported intake, BBK 80mm throttle body, Holley Dominator MPFI & DIS, Holley 36-1 crank trigger, MSD 1x cam sync, PA PMGR starter, PA 200A 3G alternator, Optima 34/78 Red battery, 100HP progressive dry direct-port NOS, R134a A/C, Spal Dual 12" HP 3168 CFM fans, Frostbite 3-core aluminum radiator, Pypes SS dual 2.5" exhaust, SS off-road X-pipe, SS shorty headers, OEM smog pump converted vacuum pump, Earl's -6AN fuel system plumbing, Walbro 255 LPH in-tank pump & Pro-M -6AN hanger, S&W subframe connectors, BMR upper & lower torque box reinforcements, highly modified Ford 4R70W transmission, FTI 9.5"/3000 stall/triple disc TCC, B&M Hammer shifter, Stifflers trans crossmember & driveshaft safety loop, FPP aluminum driveshaft, FPP 3.73 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 M/T Street Comp tires.

    Comment

    • 81 TransAm
      Senior Member
      • Nov 2014
      • 2238

      #3
      For now, I wouldn't change any of your boost Target AFRs. You changed it to 13.7 AFR at 4 lbs of boost. Probably not good. Just worry about your idle & cruise areas.

      Comment

      • Danny Cabral
        Administrator
        • Dec 2009
        • 35959

        #4
        Originally posted by 81 TransAm View Post
        You changed it to 13.7 AFR at 4 lbs of boost. Probably not good.
        Yeah, that's too lean for boosted areas.
        May God's grace bless you in the Lord Jesus Christ.
        '92 Ford Mustang GT: 385"/6.3L SBF, Dart SHP 8.2 block, Eagle 3.470" forged steel crankshaft & H-beam rods, Wiseco 4.200" forged pistons, Trick Flow Twisted Wedge 11R 205 CNC Comp Ported heads, 12:1 compression ratio, 232°-244° duration/.623" lift/114° LSA H/R camshaft, Trick Flow R-Series FTI Comp Ported intake, BBK 80mm throttle body, Holley Dominator MPFI & DIS, Holley 36-1 crank trigger, MSD 1x cam sync, PA PMGR starter, PA 200A 3G alternator, Optima 34/78 Red battery, 100HP progressive dry direct-port NOS, R134a A/C, Spal Dual 12" HP 3168 CFM fans, Frostbite 3-core aluminum radiator, Pypes SS dual 2.5" exhaust, SS off-road X-pipe, SS shorty headers, OEM smog pump converted vacuum pump, Earl's -6AN fuel system plumbing, Walbro 255 LPH in-tank pump & Pro-M -6AN hanger, S&W subframe connectors, BMR upper & lower torque box reinforcements, highly modified Ford 4R70W transmission, FTI 9.5"/3000 stall/triple disc TCC, B&M Hammer shifter, Stifflers trans crossmember & driveshaft safety loop, FPP aluminum driveshaft, FPP 3.73 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 M/T Street Comp tires.

        Comment

        • 438wStang
          Member
          • Jan 2016
          • 51

          #5
          This is why I ask. I never get around to working on the car, so it's a refresher every time I do. Thanks for the input.

          Comment

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