I was using the 560 value, which is a -20% correction factor (450/560-1). 600s would be 25%. I'm surprised people dont know what these things flow. With DSMlink in the EVO now and my spreadsheet I can probably figure it out once I get the WBO2 installed
Since I was assuming 20% would get back to stock, 16% would be 4% richer than stock. Stock target AFR is 9.5:1 over 2.1 g/rev and at the higher rpms. I dont think there is enough airflow to be over that at those RPMs in this case, but we'll assume so for the sake of explanation. 9.5*.96 is where I got the 9.1 from. To reverse it, 9.5/10.5 - 1, or about a minus 9-10 percent change. If you think -25% is more appropriate for the EVO injectors, something around -35% would get you to 10.5. In reality at 24 lbs/min (at the ECU) at 7k rpm, or about 1.55 g/rev, target AFR might well be up in the low 10s. Without DSMlink there is no way to know. The calculation could be done from IPW, but I have never taken the time to figure out how to do that. But you see my point. This is all shooting in the dark, until you get over 2.1 g/rev at the ECU (tough to do on an AFC, getting worse as injector size goes up and/or correction value goes down), which allows us to know for sure what target AFR is.