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Thread: Help with AFR swings during throttle transitions LS1 in track car - causing concern.

  1. #11
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    Quote Originally Posted by LS1Z3M View Post
    So with a target idle RPM of 950 is the following for the first 4 cells good? 750, 850, 950, 1050?
    Yes, that's perfect. Then "Fill Row Values from 1050 to whatever RPM your last redline cell is.

    Or would it be helpful to set the scale lower or higher before and after the 3rd cell?
    Nope.

    BTW, I appreciate your help and will go back and rebuild my GF making sure I use all of this information and suggestions in the link you provided.
    You're welcome.
    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.

  2. #12

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    I rebuilt the GF (attached) with the MAP scaled correctly based off an older version.
    rebuild.zip
    The engine started, idled and revs fine. Although it has not a lot of time to Learn the wide AFR swings are still clearly evident mostly when coming off throttle. Otherwise the AFR is stable and looks fine. DL attached.
    07111505.zip
    Is this an issue or is this not something I should worry about? If it is a problem, then I'm really scratching my head on how to fix it, as is the engine builder who has been using the Holley EFI systems since they came on the market,

  3. #13
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    Quote Originally Posted by LS1Z3M View Post
    The engine started, idled and revs fine. Although it has not a lot of time to Learn the wide AFR swings are still clearly evident mostly when coming off throttle. Otherwise the AFR is stable and looks fine.
    Why worry about off throttle. In deceleration, it won't go into Closed Loop, so it will never Learn these areas. If going lean on deceleration bothers you, raise the Minimum Injector Opening Time setting. If all your going to do is jab the throttle on & off it will never Learn. Long steady pulls will get it to Learn, then you can reduce the Closed Loop & Learn Limits to lock in the tune.
    Last edited by 81 TransAm; 07-11-2019 at 04:18 PM.

  4. #14
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    Or manually tune the Base Fuel Table in the deceleration area, that's what I did.
    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. #15

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    Quote Originally Posted by 81 TransAm View Post
    Why worry about off throttle. In deceleration, it won't go into Closed Loop, so it will never Learn these areas. If going lean on deceleration bothers you, raise the Minimum Injector Opening Time setting. If all your going to do is jab the throttle on & off it will never Learn. Long steady pulls will get it to Learn, then you can reduce the Closed Loop & Learn Limits to lock in the tune.
    Full on/off throttle is a necessary and desirable function of track driving that can't be avoided. The DL file I attached was just an example, but the same thing happens on track. I'll check into adjusting the Minimum Injector Opening Time setting.

  6. #16

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    Quote Originally Posted by Danny Cabral View Post
    Or manually tune the Base Fuel Table in the deceleration area, that's what I did.
    We've been trying this approach with minimal results since the events can happen at any RPM.

  7. #17
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    Quote Originally Posted by LS1Z3M View Post
    Full on/off throttle is a necessary and desirable function of track driving that can't be avoided. The DL file I attached was just an example, but the same thing happens on track. I'll check into adjusting the Minimum Injector Opening Time setting.
    Do the Learning with long steady pulls, then lock the tune in, then you can jab the throttle all you want.

  8. #18

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    Quote Originally Posted by 81 TransAm View Post
    If going lean on deceleration bothers you, raise the Minimum Injector Opening Time setting.
    I checked and this is currently set to 0, do you have a recommendation for a value I could use as a starting point? Thanks for the support.

  9. #19
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    Quote Originally Posted by LS1Z3M View Post
    I checked and this is currently set to 0, do you have a recommendation for a value I could use as a starting point? Thanks for the support.
    I use 1.00 msec Minimum Injector Opening Time.

    Quote Originally Posted by 81 TransAm View Post
    Do the Learning with long steady pulls, then lock the tune in, then you can jab the throttle all you want.
    Yeah, like this: http://www.youtube.com/watch?v=qwkqjotkDJQ (Holley EFI Learn/Self-Tuning Demonstration)
    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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    Quote Originally Posted by LS1Z3M View Post
    I checked and this is currently set to 0, do you have a recommendation for a value I could use as a starting point? Thanks for the support.
    I use 1.8 msec because I don't like popping on deceleration. But as long as you are below your idle & cruise IPWs, you can use anything you want.

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