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Thread: Engine goes lean during shifting & launching.

  1. #11

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    I’m not using Sniper EFI. It’s the Holley HP from Terminator kit.

  2. #12
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    23,059

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    Same difference, all TBI base calibrations. (I corrected it above.)
    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.

  3. #13

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    Gotcha. Thanks. I’ll revisit those links tonight and try to wrap my head around how to do this. Earlier it sounded like you were saying that changing the AE won’t do anything until the Base Fuel Table is tuned because the AE acts as a multiplier of the base map figures. Is that correct?

    UPDATE: Revisited the links that you referred me to. Couldn’t find anything that explains how to correctly modify the Base Fuel Table to correct the lean condition.

  4. #14
    Join Date
    Nov 2014
    Location
    Ont. Canada
    Posts
    1,438

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    Go to your Base Fuel Table, highlight the area you want to modify, right click and a drop down will open, choose "Offset Selected" and then make your changes. With a well tuned Base Fuel Table you need very little AE enrichment. This is what I use.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    Last edited by 81 TransAm; 10-20-2019 at 09:07 AM.

  5. #15
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    Dec 2009
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    Connecticut
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    23,059

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    Read paragraphs 3, 4 & 5: http://forums.holley.com/showthread....2523#post62523 (Holley EFI Tuning Tips & Information)
    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.

  6. #16

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    81 TransAm: Wow. That’s a lot less AE than I was expecting to see. But it makes sense to me why a well-tuned fuel map shouldn’t need much AE. The hurdle is getting the map dialed-in when the ECU doesn’t self-Learn while TPS is rapidly changing. Right?

    Thanks, Danny. This is starting to make more sense. I’ll get to work on this later in the week. Should be able to do some datalogging and tuning prior to & during the final track days of the year on Wed & Fri.
    Can you post some screenshots of your current timing table, fuel map, and fuel map graph? I think that might be helpful as a general reference.

  7. #17
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    23,059

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    https://forums.holley.com/showthread...8640#post88640 (Target A/F Ratio Table & Base Timing Table Reference)
    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.

  8. #18

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    Thank you. I don’t see a fuel map, though.

  9. #19
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    23,059

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    I've never posted the Base Fuel Table. Everyone's table will be different. Hint: Most people find the first LINK (especially post #4) from post #10 a gold mine.
    Read 4th & 5th paragraphs: http://forums.holley.com/showthread....2523#post62523 (Holley EFI Tuning Tips & Information)
    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.

  10. #20

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    I realize that everyone’s will be different. I just want to see an example of a well-tuned fuel table to get a baseline idea of what it looks like.
    I clicked the links and read the paragraphs. Is it possible for you to show me an example of a polished Base Fuel Table? Humor me, please.

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