I dont think it is as easy as that..... What is the throttle position? What is the AFR? How much load is it under?
When I had my safc tuned in my r33 it took them a good hour, and 4 or 5 dyno runs to get it perfect, and it bloody did well, gained 28rwkw and ~300kms EXTRA out of a full tank of petrol, was VERY happy!!