my target air/fuel ratio is 11.5:1..

when tuning.. should it drop from ~14.6 to 11.5 AS SOON AS you hit 1psi? or later? or gradually?

 

It depends on what your fuel values are in the cells before 1 psi. you want it to gradually go from 16:1 or 14.7:1 at high idle to 12.5:1 or 11.5:1 in boost. Below is a pic of a "Golden Sheet" as some people call it. Those are my target AFR's for the different vacuum and boost columns. I'll adjust my fuel as needed for each cell or group of cells to meet my target AFR to match what is in my pic. I bolded the part saying it was my golden sheet, because I choose the numbers in the cells based on research I've done. For your "golden sheet" you may want to run slightly different AFR's. For example you might think that 11.5:1 is safer for the boosted portions, or that you want to run 16:1 AFR in the high vacuum cells to imporve gas mileage while cruising. Just make sure that you make the AFR changes gradual because if you were to go from 14.7:1 AFR in vacuum to 11:1 under boost the tranmsition from lean to rich might be felt while driving.

I'm actually thinking about changing the 12.5:1 to 13:1 and making my boosted cells 12.5:1.