Ok, if the title didnt bore you already, lets follow on from here as requested whilst Rob's car warms up.........
https://passionford.com/forum/viewtopic.php?t=65299

Induction Stroke Time Base...
The basis is as follows: To get fuel into an engine, most of you know that we simply open and close an injector, releasing as much or little fuel as the cylinder needs at that particular time to keep the stoichiometry at the desired level.. What most of you probably wont have considered is the limitations placed upon us with regards how and when we are able to do this.....

Lets take 3000RPM for example.
At 3000rpm with a cam of 260 degrees duration, we have approximately 38milliseconds available to us when the intake valve is actually OPEN... Now this time, in injection terms.. is a fookin eternity and allows us to spray loads of fuel into the eagerly awaiting cylinder so we can have lots of boost and lots of torque...

Now lets look at 6000rpm...
The same engine now only has 19ms of intake valve open time available to us because the engine is spinning twice as fast!! So we can now only add half as much fuel as we could at 3000rpm...

Do we need to even consider 9000rpm? 8ms? What the fook are we going to do with that tiny time frame?

What we will do is choose an injector that can supply the fuel required for the horsepower expected, and deliver it in the "Induction Stroke Time Base" available to us. IE: If we expect peak power to be 600bhp at around 9000rpm then we choose an injector that can flow the fuel for 600BHP (Or 150bhp actually if a 4cyl and 4 injectors ) in approx 9ms and still not be flat out (No more than 85% load on the injector if possible)

Now the above is VERY simplified.. but im sure it helps you to grasp the reason why sometimes we will increase fuel pressure and also sometimes we have to use a far bigger injector than the man in the street can understand.... Basically as peak power moves higher and higher up the rev range, we need an exponentially bigger injector to deal with it.....

I hope the above has been usefull to you and helps you sleep. Please think of me whilst im out mapping tonight while you all drink beer.