Precision Turbo and Engine BigStuff3 GEN3 PRO SEFI (LS1) System Hardware & BigComm Software - Manual (Page 90)

BigStuff3 Pro SEFI System (LS1)
Version 1.0 89
Staged mode turns on boost stages (solenoid valves) in a user defined, time sequence. PWM
mode assumes the boost system is configured with a PWM boost valve. When the PWM mode
is enabled the Stage 1 – 3 timer input windows are made inactive, as shown in the screen print
above. When Staged mode is selected, the Stage Timer input windows are active as shown in
the screen print below.
The stage timer starts once the following criteria are satisfied:
Minimum RPM – This input establishes the minimum RPM the engine must reach to initiate the
boost timing sequence.
Minimum Throttle Position Sensor (TPS) – This input establishes the minimum throttle
position the TPS sensor must reach to initiate the boost timing sequence.
Both the Minimum RPM and Minimum Throttle Position inputs must be satisfied before the
boost timing is initiated.
62. Boost PWM
Before this table becomes active, PWM needs to be selected in the Boost mode window of the
boost configuration table. The values inputted into the PWM window below represent the
percent (%) duty cycle of the boost valve. The PWM boost function will run continuously when
this mode is enabled. The solenoid valve used must be a Normally Closed (NC) valve. The
valve is T’d into the line from the turbo compressor to the bottom of the wastegate diaphragm.
The solenoid valve resistance must not be lower than 14 ohms w /14 volt supply (1 A) . One end
of the solenoid valve is connected to Switched Ignition and the other to the Boost Connector, Pin
B. See
Boost_Connector_Pin_Out .
.1-second resolution