air fuel ratio

Old 02-25-2008, 02:34 PM
  #1  
contagious
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Default 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
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Old 02-25-2008, 03:04 PM
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OneBadGMC
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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.
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Old 02-25-2008, 03:40 PM
  #3  
suicidebomb
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Default a/f ratios

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?
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Old 02-25-2008, 05:46 PM
  #4  
nova77
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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
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Old 02-26-2008, 07:15 AM
  #5  
OneBadGMC
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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.
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