PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

Lean and Rich.... Question Inside

Old May 27, 2009 | 10:09 PM
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Question Lean and Rich.... Question Inside

What are the parameters for running lean and rich. What is considered lean? What is considered rich?

All i know is 14.7 (stoich) is ideal for crusing
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Old May 27, 2009 | 11:41 PM
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anything above 14.7 is lean and anything below is rich
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Old May 28, 2009 | 11:25 AM
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Originally Posted by matai70
anything above 14.7 is lean and anything below is rich
Thanks..

Ideally which should the A:F be at the following??

Idle - ??
Cruise - 14.7?
Part Throttle - ??
WOT - 12.8 - 13.1?

Thnaks for the help
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Old May 28, 2009 | 12:12 PM
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Anything not WOT should be stoich 14.7
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Old May 28, 2009 | 12:15 PM
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You need to read this and some of the stickies at the top. This doc isn't the 100% truth but it will make sense of most of it. Main thing is DON'T try to tune your PE table without a wideband sensor.

*edit Had to trim alot of the document out in order for it to be the correct size to upload it. I'll try to find the link with the whole document


https://ls1tech.com/forums/pcm-diagn...une-101-a.html

There is the full document. Also read the end of the thread before it was locked and you'll see some of the issues guys had with it as far as some info being incorrect.
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Last edited by 1987firechicken; May 28, 2009 at 12:42 PM.
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Old May 28, 2009 | 02:22 PM
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i am not tuning myself. i jsut could not remeber what the A:F should be at idle, cruise, part throttle and WOT
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