I am lazy, so I wont type as much.
But from my experiences of engine building and tuning, engines are base mapped on engine dynos where conditions can be held and repeated to obtain the best for those conditions and the targets have been met.
But once the engine is introduce into the car and the car is driven those conditions will change. Hence most the time the map is tweaked once the car is running and driven. This is to take into aco**** discrepencies like Nick has pointed out with breathing, climate, driving style, heat, etc.
Terry/Rally Knight.. I am very interested with this project and would love to be kept informed... I have a genuine interest (hobby) with tunning Subarus.