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Thread: Target Air/Fuel Ratio Graph Layout

  1. #1

    Talking Target Air/Fuel Ratio TABLE 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. 

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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 at 03:11 PM.

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

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    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS TW 11R 205 heads, 11.8:1 comp, TFS R-Series intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 160A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, M4602G aluminum driveshaft, FRPP 3.31 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 tires.

  3. #3
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    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.

  4. #4
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    Quote 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" SBF, Dart SHP 8.2 block, TFS TW 11R 205 heads, 11.8:1 comp, TFS R-Series intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 160A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, M4602G aluminum driveshaft, FRPP 3.31 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 tires.

  5. #5

    Default

    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.

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