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

  1. #31
    Join Date
    Nov 2014
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    Ont. Canada
    Posts
    1,329

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    Quote Originally Posted by LS1Z3M View Post
    So I'm a bit paranoid about the AFR swings during throttle transition and the Learn deactivating at times.
    If you have concerns, take the car to a chassis dyno and spend a couple hours doing long slow pulls to dial the Base Fuel Table in. Then reduce the Closed Loop & Learn Limits to lock the tune in. Small price to pay for peace of mind. If your plan was to go to the track and drive it like you were in a race, you will probable be buying a new engine. It will not Learn properly under those conditions. It'll be in Open Loop most of the time because of the rapid throttle movement. This means if the Base Fuel Table is not dialed in your fueling could be way off.

  2. #32
    Join Date
    Dec 2009
    Location
    Connecticut
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    22,127

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    Quote Originally Posted by LS1Z3M View Post
    At present, this control is set to 3.
    Advanced Control of "3" is fine.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: Dominator MPFI & DIS, A/C, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/X-pipe/shorty headers, 100HP progressive dry direct-port NOS, 160A 3G alternator, Optima Red battery, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, 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. #33

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    Quote Originally Posted by 81 TransAm View Post
    If you have concerns, take the car to a chassis dyno and spend a couple hours doing long slow pulls to dial the Base Fuel Table in. Then reduce the Closed Loop & Learn Limits to lock the tune in. Small price to pay for peace of mind. If your plan was to go to the track and drive it like you were in a race, you will probable be buying a new engine. It will not Learn properly under those conditions. It'll be in Open Loop most of the time because of the rapid throttle movement. This means if the Base Fuel Table is not dialed in your fueling could be way off.
    I understand what you're saying and I'll take this approach.

    Fortunately, I can accomplish the same thing at the track I go to and do some long slow pulls while minimizing throttle transitions. I'm one of the founders of Clubmotorsports (www.clubmotorsports.com) a track in Tamworth, NH and have unlimited access on "member days", which are most Weds through Sundays. Very often I'm on of just a couple of cars on the track at any given time. If any of those who have been helping me out have an interest in coming up as my guest and driving on a beautiful road course, please let me know.
    Last edited by LS1Z3M; 07-16-2019 at 12:26 PM.

  4. #34

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    1500-2000 RPM, 84-105 kPa hole? And for 505 HP engine you don't have enough fuel in the high RPM area. But a couple WOT pulls will sort it out fast, just don't limit the Closed Loop & Learn before your whole Base Fuel Table is gone trough Learning. After it's close, you can start playing with AE fueling and other modifiers.

  5. #35

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    Quote Originally Posted by LS1Z3M View Post
    Fortunately, I can accomplish the same thing at the track I go to and do some long slow pulls while minimizing throttle transitions.
    That's a very nice luxury to have! Make sure to have the Learn Table open on your laptop in the passenger seat. Try to hit as many cells as you can. Some are impossible to hit and are of no concern.

  6. #36

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    Hey, any update to this? I did want to do IEA, but you had other major issues that needed to be addressed first. Send me another email.

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