Intrested in tuning the car correctly. There are these values i am confused about they give you a math equasion. Trying to determine the value of the Stock B16 Injectors flow. there is a simple F1 P1 F2 P2 values.

F1 Injector flow CC/min
P1 Current Fuel pressure
F2 New injector flow
P2 New fuel pressure P2= P1 X (F2/F1)2


I have addded a high performance head. I do have a air filter and a larger exhaust mid section. This says things like add 5% or 10 % for changes.


Struggling to figure out what percentage i add for Intake or Exhaust and Port/polish head. if i add lets say 15% will this work?


F1= 270cc/min
F2= 284cc min (270+5%)
P1= 43 psi
p2= 43 psi X (284/270)2
Or
P2 = 48 psi


So im good with making the basic math function. Just not sure on determineing the injector flow value. If anyone can help it would be great

I know these things are pretty basic and simple and old so, just like to know how to correctly do it