[steviek]

no there is. When tuning with safc2 there are two things you gotta keep in mind. The first is that safc bridges the airflow wire to your ecu and then "subtracts" airflow from the signal and reduces the amount of airflow the ecu sees. This tricks the computer into spraying less fuel and the a/f ratios are accomodated proportionally. However, the ecu is blind to the fact that you are actually running more airflow. This makes it continue to have advanced timing according to the airflow it is seeing not the actual airflow which is in the motor. That is the recipe for knock. Now that being said the safc can compensate the injectors down. the formula is simple 450/660-1. That will give you a percentage in your case -32%. That would be your start for tune. Provided everything else is running properly fuel pressure is good fuel pump can sustain the extra fuel flow etc that number would be the proper correction. There are many more things to consider like knock, timing, airflow in hz etc before you can really have your car properly tuned. Safc is very limited in this regard. Gm Maf translator can help but requires at leaswt a logger very recommended dsmlink to switchover etc.
Check my write up for some more info
http://www.automotiveforums.com/vbul...d.php?t=647000