Defi Link Meter - Manual (Page 49)

102
「DIFFERENTIAL PRESSURE MODE」
If both of the fuel pressure meter and turbo
meter are installed, DIFFERENTIAL
PRESSURE LED comes on by pressing the
UP switch and the DOWN switch at the
same time. This indicates DIFFERENTIAL
PRESSURE MODE. In this mode, the fuel
pressure meter indicates the pressure value
which is the intake manifold pressure value
subtracted from the fuel pressure value.
If the UP switch and the DOWN switch are
pressed at the same time, meters return to
REAL MODE.
About differential pressure display of fuel
pressure
Generally, fuel pressure of electric controlled
engine car is fixed in contrast to intake
manifold pressure by fuel pressure regulator.
As shown in the graph, fuel pressure meter
displaying absolute pressure value indicates
400kPa when boost pressure is 100kPa in
case that differential pressure is set at
300kPa. Fuel pressure meter displaying the
differential pressure value indicates
300kPa.
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
-0.5
-1.0
close
Pressure
【X100kPa】
open
boost
pressure -0.7
boost
pressure
1.0
fuel pressure
【differential pressure】
【absolute pressure】
atomospheric
pressure
3.0
2.3
4.0
3.0
Throttle
Control Unit Ⅱ
The relation between fuel pressure
and intake manifold pressure