Flat Line IFR

[Lastyear4gt]

I have read all the posts I can find about tuning the IFR for flat line and sloped systems, and there seems to be alot of different opinions on the correct equation to figure this out.

I have a 04 3400 V6 with a return system running a flat line IFR that has a fuel pressure of about 62PSI in boost and I am running Delphi 42.5lb/hr injectors that are rated at 42.29lb/hr @ 43.5 PSI. What is the proper way of figuring this out?

[5_Liter_Eater]

What is the fuel pressure when you disconnect the vacuum line from the regulator? Use this number for fuel pressure and plug in these numbers into the injectors.xls spreadsheet. Flatline the IFR at whatever value is at the 0 kPa column.

[Lastyear4gt]

OK, so I found out that the system fuel pressure is 58PSI. So going by the graph, I have come up with this:

Injector rated fuel pressure: 44.3 psi
Fuel rail pressure: 58 psi
Injector flow rate: 42.5 psi

The result is 6.127334769 g/sec @ 0 kPa

So the way I see it I took 6.127334769 X 60 X 60 = 22060 g/hr = 48.63 lb/hr

Does this look correct?

[5_Liter_Eater]

Yep.