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Relating afr to power

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Old May 21, 2005 | 06:19 AM
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Default Relating afr to power

Is there a way you can relate an afr correction into power? I pulled out the wb last weekend and noticed I was running 10.9 afr @ 6,000 rpm.

Now, if I moved this to 12.8 that is close to a 2 point afr change. How much power is this?

Example
1 point change = 10hp @ given rpm

I'm sure it's not this easy but, is there a pattern you guys have noticed?

Thanks.
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Old May 21, 2005 | 05:37 PM
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Not sure about an across the board correction factor, but just finished getting mine from 10.5 to 12.2 and picked up 25hp across the board. I think this will vary with the combo.
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Old May 21, 2005 | 08:36 PM
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Wow, that being the only change correct? Very impressive.
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Old May 22, 2005 | 02:37 AM
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Yea that was the only change, original afr was probably closer to 10.0. Pig rich to nice and clean, even the exhaust note changed for the better.
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Old May 22, 2005 | 09:17 AM
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yes there are some equations, that i actually have used for my thermo class, and you can figure out power from the air fule ratio and fuel flow rates. i never got it to work out though lol

my friends ss we got 10 rwhp moving the a/f very slightly from rich to lean, im sure there was more left, it was prob only a half point that we moved it for 10 hp
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