Vortech Super FMU - Manual (Page 2)

4. VACUUM PORT
A. Attach a 5/32" or 3/16" vacuum line from the intake manifold to
the 3/16" hose barb located on the SFMU lid. Approximately
two or three inches from the SFMU, cut the vacuum hose and
insert the supplied restrictor. Reconnect both ends of the hose.
B. Start the engine. Using full idle vacuum and a fuel pressure
gauge, adjust the vacuum screw until the desired idle fuel pres-
sure is reached (usually around 32-34 psig).
5. BOOST PORT
The boost screw limits the maximum fuel pressure under boost. If
the screw is set all the way in, it will not regulate and the fuel
pressure curve will continue to rise as boost increases. Turning
the screw counterclockwise will allow the valve to regulate the in-
ternal air pressure and maintain a fuel pressure upper limit.
6. BLEED PORT
This port comes from Vortech plugged. If desired, an optional bleed
valve is available which can lower the slope set by the calibration
disk and dampen the fuel curve transitions.
FUEL PRESSURE CHART
(SPRING INSTALLED, STATIC FUEL PRESSURE SET AT 35 PSI)
100
90
80
70
60
50
40
30
0 5 10 15 20
CALIBRATION WASHER DIA.
Ш 3.62
Ш 2.72
Ш 2.47
Ш 2.22
BOOST PRESSURE (PSIG)
APPROXIMATE FUEL RAIL PRESSURE (PSI)
NOTE: A container of compressed air with a regulator is helpful
to simulate manifold pressure when setting up the SFMU fuel
curve.
SUPER FUEL MANAGEMENT UNIT (SFMU),
CONT'D.
NOTE: On vehicles with low vacuum at idle (large camshafts),
the vacuum adjustment screw may have little or no effect on
fuel rail pressure.