air / fuel ratio

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Mar 21, 2008 | 02:17 PM

s10-den

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From: florida

air / fuel ratio

what are you guys puting you air/fuel ratio at ?Best for mpg and hp?thanks

Mar 21, 2008 | 04:50 PM

98WhiteDevil

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From: Farmington Hills, MI

14.7 for normal driving. 12.7-12.8 for WOT.

Mar 21, 2008 | 07:45 PM

macca_779

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From: Katherine N.T Australia

The richest I run is 12.6 for PE and the leanest at 16.2 open loop cruising

Mar 22, 2008 | 04:06 PM

s10-den

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From: florida

so im assuming the "tuner"will know what to do?? or no?

Mar 22, 2008 | 06:22 PM

98WhiteDevil

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From: Farmington Hills, MI

Yeah, you can leave your stock values in there. I haven't looked at a stock tune for a while, but if I remember correctly, the stock values are set a little lean.

Mar 23, 2008 | 07:12 AM

s10-den

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From: florida

I thought they were rich?

Mar 23, 2008 | 08:42 AM

98WhiteDevil

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From: Farmington Hills, MI

All stock cars are set lean for emissions. One of the key signs is that there will be a little bit of white powder on your spark plugs.

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Mar 23, 2008 | 01:00 PM

John_D.

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From: Lebanon TN

Probably best to leave it at 14.7 for idle and part-throttle.
Some folks are running a bit leaner, but tuning for that is more involved.
The pcm expects it to run at 14.7, o2 sensor switching is set around that, ltrims, etc.

WOT, could be anywhere from 12.2 to 12.8. Will you be tuning with a dyno?

My stock power enrichment was set rich from the factory. EQ ratio of 1.25 from 2400 rpms and up, which is 11.7:1 based on the 14.63 stoich afr setting in the tune.