BUFFALONOGAROpebFATS

here is the thread where my train of thought originated.

basically what duty cycle is ok and whats the function of the ecu reading it. where does efficiency start to deplete?<ul><li><a href="https://forums.audiworld.com/s4/msgs/2186118.phtml">orig thread</a></li></ul>

System_S4k

Then why are you worried? The fuel is obviously there, otherwise you would be knocking like crazy.
Obviously, a DC above 100% is concerning, but if you aren't leaning out and you aren't knocking, then you have plenty of fuel. Trust me, you know when you run out of injector.

BUFFALONOGAROpebFATS

not an issue now, but i am trying to plan for the future since the k04's are coming out

System_S4k

I would worry more about restrictions (fuel lines and rails) and fuel flow (big *** fuel pump) more than duty cycles.
I run 950's on my eclipse and it took a good amount of modification to the fuel system to even get it to flow that much fuel. Not so easy as changing out the injectors.
Duty cycles are pretty useless at that point. Tune with a wideband and knock. If your car leans out on the top end and your DC is really high, time to upsize.

BUFFALONOGAROpebFATS

i dont plan on even using a 5 bar fpr. k04 housings with and rs6 wheel, bigger, but not by a ton