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it says the Field sfc can go plus or minus 30% fuel delivery. my question is after i dyno my car how much of an affect are the Field % points going to have on the air fuel ratio? If i am running 13.5:1 air fuel and i wanna go down to 12.5:1, how do i know roughyl how many % points to increas the Field unit? Should i start with say 5% increase and go up form there?/

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I have added like two points of adjustment to get about .2-.7 out of it.
On a pull in 4th gear I saw 12.2 in the 4.5-5K range I added 2 points and it dropped down into the 11.4-11.7 range. I think it just kind of varies abit on load and a few other things.
 
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