FIC 850s simple deadtime question

[2gGSX]

To summarize in case there's any more confusion--

1. The ECU assumes the standard base fuel pressure for whatever generation car you have (37 psi or 43 psi), and assumes that all injectors are rated via 43 psi base fuel pressure.

2. In all ACTUALITY, the 1g cars' injectors flow less than other 43 psi rated injectors.

For example--with FIC 1000cc injectors (rated at 43 psi base fuel pressure), you pull 55% regardless of 1g or 2g. However, if you do any fuel calculations (e.g. how much fuel am I flowing at 50% IDC), then a 2g car will actually flow .50 x 1000 x 4 = 2000 cc/min while a 1g car will actually flow .50 x 1000 x 4 x (37/43)^.5 = 1855cc.

 

[steve]

To summarize in case there's any more confusion--

1. The ECU assumes the standard base fuel pressure for whatever generation car you have (37 psi or 43 psi), and assumes that all injectors are rated via 43 psi base fuel pressure.

It doesn't make any assumptions about what pressure the injectors are rated at. The ECU is told what size the injectors are, the effective rate.

2. In all ACTUALITY, the 1g cars' injectors flow less than other 43 psi rated injectors.

The only reason for the difference is because of the lower base fuel pressure. If you ran 43.5psi on a 1G the injectors would flow the same fuel volume as a 2G sitting next to it.

It might be clear to everybody that raising a number to the 0.5 power is the same as taking the square root of that number.