Originally Posted by tunertype
Anything over 80% hurts the injectors reliability, but upgrading injectors when your at 95% will net you 0hp gain only increased reliability.
I wouldn't quite say that. Some big race engine shops like Rebello believe that when the fuel injector is open you are blocking a little bit of air flow, ie a long injector duty cycle hurts power. HOWEVER, I also have never seen any data for or against this theory.
Another thing that could explain why their theory is caused; since you're maxing out the injectors to hit you targeted afr you could have very different afrs on different cylinders just from the manufacturing tolerances of the injectors, which would effect power. This does happen.