Actually you need to be able to put in the fuel pressure, especially with a turbo or at least know what the chart assumes the pressure to be. It looks like you assume ~44PSI (?) while a turbo will add the boost pressure to the standard 44PSI of fuel pressure. So while it looks like by your chart you need 426cc/min injectors to make 300HP on a turbo car, you really only need 370's if you're running 15PSI of boost. One could use the lower "conversion" chart but you probably should explain what "static" fuel pressure the upper chart is using? By using RC racing's chart, I figured the 44PSI spec.
For pressure effects, you have to look at the injector mfgr's flow ratings then adjust accordingly. The mfgr specs flow at a pressure.
The tool I made tells you the flow you need in cc/min and lbs/hr. It does not address pressure differences between manufactures as it is not needed.
For example, say you punch numbers into the tool and it determines you need 370cc/min of flow.. and you can get a great deal on 350cc/min injectors that are rated at this flow at 44psi by the mfgr. You then go to the bottom of the page and figure out the psi you need to run the 350 injectors at 370.
I just did 300HP, turbo, 6 cyl and 85% and it said 401 cc/min. If I click the "low compression" and 85% it comes up 370. Try it again making sure you have 80%, 6 cyl and BFSC of .65 selected, that combo should say 370cc/min for a turbo engine at 15PSI of boost. Like I said the amount of boost changes the fuel pressure so without that "option", you are just guessing at the injector size needed.
And like I said most people say to -never- go over 80% duty cycle in calculating injector size so 85% shouldn't even be an option..
I'm not using MS vitual machine or IE so maybe it only works on a windows machine? It's a neat idea but without knowing the fuel pressure used to calculate this (or taking into account the turbo's effect on fuel pressure) it could easly mislead someone when choosing their injectors.