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AFR low, how much to lean out?

Old 08-21-2004, 05:14 AM
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Default AFR low, how much to lean out?

I've read this somewhere. Not sure if its on here or elsewhere but does anyone remember what the ratio is for leaning out AFR? For example, how much % fuel do you decrease in order to drop 0.1% AFR? I'm running pretty relatively rich around 10.5-low 11.0's and want to lean it out a bit...

If I find the answer I'll post it up as well but just want to see if anyone knew it off the top of their head.
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Old 08-21-2004, 08:56 AM
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Default Re:AFR low, how much to lean out?

What are you using to tune/fuel management?
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Old 08-21-2004, 10:38 AM
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Default Re:AFR low, how much to lean out?

I had read once that every 10% is approx 1.0 change in A/F
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Old 08-21-2004, 01:21 PM
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Default Re:AFR low, how much to lean out?

using uberdata at the moment... anyone want to confirm a 10% change in fuel = 1.0 change in AFR? I think read the same thing but would like someone to confirm it.
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Old 08-21-2004, 01:23 PM
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Default Re:AFR low, how much to lean out?

I couldn't see how that would possibly be accurate. There are so many variables to factor in that it would never be an accurate way of changing the A/F ratio.
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Old 08-21-2004, 01:46 PM
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Default Re:AFR low, how much to lean out?

i understand your point doc. but a good estimation is better than deciding to decrease it 20% without knowing some ball park figure of what is going to happen...

anyone else?
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Old 08-21-2004, 08:34 PM
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Default Re:AFR low, how much to lean out?

cmon i know someone else has a b16 and is using uberdata with a t3... just a rough estimate!
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Old 08-22-2004, 01:21 AM
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Default Re:AFR low, how much to lean out?

just a rough estimate but for my setup a 1%-2% => 0.1 change in AFR--same as 10% change in fuel = 1.0 AFR change. Just thought I'd let you fools know...
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Old 08-22-2004, 08:33 AM
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Default Re:AFR low, how much to lean out?

I had read once that every 10% is approx 1.0 change in A/F
On your setup yeah, 10% is roughly 1 A/F point.
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