you might want to slow down on making new topics. you have made a ton lately. i know there is all sorts of stuff you want to know, but searching and the faq has a lot of good info in it. i just mention because oftentimes someone that creates a lot of topics people will start to overlook them.
that aside-
as a basic guidline we have always used safe rwhp = cc * .87
that will give you a good idea of where you want to be. some people have made more hp on small injectors by raising base fuel pressure. but this is only effective up to a point. you can push the injectors well beyond the ideal duty cycle as well as hose up the spray pattern.
if you go too big on an injector you are going to run way too rich. our cars from the factory run on the rich side, and going too big will make it even more so. could get to a point where it is running so rich you are washing down the cyl walls.
sure, you can lower base fuel pressure, and scale down the airflow signal to decrease fuel flow, but only to a point. too low of fuel pressure will have poor spray patterns and just plain not work correctly. scaling too much of the airflow signal will start advancing the timing so much you could get detonation/knock and skyrocket egt's.
you need to set forth a goal for the car as far as horsepower, turbo, fuel mgmt, etc. then from there determine what size injector you need.
