Originally Posted by
joecar
Expanding on what dfe1 said:
GenIII:
pressure difference
across injector = FP + MANVAC
so then: IFR = R0 * sqrt((FP + MANVAC) / P0)
where: FP = fuel rail pressure = 58 psi = 4 bar = 400 kPa
GenIV:
pressure difference
across injector = DELTAMAP
so then: IFR = R0 * sqrt(DELTAMAP / P0)
This is what Gelf did using the spreadsheet.
So it seems that DELTAMAP is the same as FP + MANVAC... they are both the pressure difference across any one injector.
This can be used to convert the vertical axises between the GenIV and GenIII B4001 tables...
OEM stock value of FP is 4 bar (58 psi, 400kPa):
Code:
MANVAC MANVAC+FP
[kPa] [kPa]
0 400 <--- WOT
10 410
20 420
30 430
40 440
50 450
60 460
70 470 <--- idle (small cam)
80 480
I need a sanity check, does that make any sense...?
So, in other words:
the GenIV B4001 cells between DELTAMAP 400 and 480 [kPa] correspond to
the GenIII B4001 cells between MANVAC 0 and 80 [kPa].
See the highlighted cells in the attached ZR1/LS9 B4001 table.