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Thread: air fuel ratio

  1. #1
    Senior Member MASTER BUILDER
    Join Date
    Nov 2005
    Location
    Mobile,Al.
    Posts
    127

    air fuel ratio

    whats is the best air fuel ratio set up for racing? have a air fuel meter that i got from a friend,and checked my motor.At 4800 to 5000 rpm it is around 14-9 15-2. is that a little lean 509 cid 950 carb

  2. #2
    Senior Member RACING JUNKIE
    Join Date
    Sep 2007
    Location
    Belleville, IL
    Posts
    658
    That's darn near impossible to answer because of the factors involved.

    Intake, exhaust, compression, heads, vacuum, and weather variables play too big of a part of it.

    Every motor is going to have it's own 'fine point' with a/f ratio.

    What's going to do the most justice for you is to find your best et, noting the a/f ratio and shoot for that ratio as weather conditions change.

    Tuning for a specific a/f ratio or egt requires the use of a weather station and a knowledge on jet area as it relates to egt or a/f ratio.
    -WJ Birmingham

    OneBadGMC.com

  3. #3
    Senior Member RACING JUNKIE
    Join Date
    Jul 2007
    Location
    Independence, Missouri
    Posts
    1,188

    a/f ratios

    Quote Originally Posted by OneBadGMC
    That's darn near impossible to answer because of the factors involved.

    Intake, exhaust, compression, heads, vacuum, and weather variables play too big of a part of it.

    Every motor is going to have it's own 'fine point' with a/f ratio.

    What's going to do the most justice for you is to find your best et, noting the a/f ratio and shoot for that ratio as weather conditions change.

    Tuning for a specific a/f ratio or egt requires the use of a weather station and a knowledge on jet area as it

    relates to egt or a/f ratio.
    Have you ever used an air density gauge for tuning? are they ok in your opinion? Or does one need a full blown weather station, I realize that they make no provision for humidity, but is ithat much of a drawback?

  4. #4
    Junior Member JOURNEYMAN
    Join Date
    Nov 2006
    Location
    san antonio,texas
    Posts
    28
    i would go to Innovate motorsports . They have a form there and all they talk about is AFR. they can answer an guestion about AFR

  5. #5
    Senior Member RACING JUNKIE
    Join Date
    Sep 2007
    Location
    Belleville, IL
    Posts
    658
    Never used a density gauge, sorry.

    I have a Computech RaceAir Pro 1000.

    http://www.computechracing.com/Produ...-portable.html

    I don't know how I got along before I bought it.
    -WJ Birmingham

    OneBadGMC.com


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