Originally Posted by foreigneRS
it also doesn't tall you that you are getting the best torque that you possibly could - only that you are in the right area
imo, only a dyno can do that entirely accurately. although by using a g-meter (or just a time/distance measurement) on a repeatable stretch of road to measure acceleration can give you some idea
Although experience of a very similar spec engine can do that
Im sure most of the guys on here mapping cossies for example, know full well what AFR's are going to work on which spec without needing the dyno again and can get ridiculously close to ideal results just from experience/AFR