Precision Turbo and Engine BigStuff3 GEN3 PRO SEFI System Hardware & BigComm Software - Manual (Page 24)

BigStuff3 Pro SEFI System
Version 2.1 – February 2011 21
Crank Trigger
Reference
BS3 Connector - A (Red wire) BS3 Connector - B (Black wire)
MSD Distributor Violet/Black wire Orange/Black wire
MSD Crank Trigger Green Purple
Accel 44000 Series Black White
Accel Crank Trigger Black White
MAP (Manifold Absolute Pressure) – (Green, 3-way Packard connector)
The GEN3 system is supplied with Packard green connector, which directly mates to a GM style 1
BAR Manifold Absolute Pressure (MAP) sensor. For normally aspirated engines, a 1 bar sensor is
used. For blown or turbocharged applications a 2
BAR MAP sensor must be used for boost
pressures up to 15 PSI. For boost pressures up to
30 PSI a 3 BAR MAP sensor must be used. If a 2
or 3 BAR MAP sensors are used, the harness side
MAP sensor connector can be easily modified (or
replaced). The modification involves cutting a
new key-way in the connector Contact a BigStuff
dealer if questions come up related to the MAP sensor supplied with your system, and to procure the
necessary connectors.
BigStuff3’s four (4) BAR MAP sensor is capable of sensing pressures up to 52 PSI. A new connector
(available from BigStuff3) must be used with the four (4) BAR MAP sensor.
For speed/density applications the MAP sensor must be connected to an intake manifold port.
For Alpha/N systems, a 1 BAR MAP sensor can be used to sense ambient air pressure in the hood
scoop or air cleaner. Do not attach the sensor pressure port to the manifold.
More MAP sensor wiring information is available on the Bigstuff3 website via this link:
http://bigstuff3.com/pdf/MAP-Pressure.pdf . Back_to_Map
Boost (Black 4-way Packard Connector)
The 4-way boost connector
The 4-way “Boost” connector in the main wire harness plays several key roles in the operation of the
following base system features. This connector is used to:
 Trigger the internal data logger (connector location A)
 Trigger the internal timer, known as the “Timer Enable” (connector location A)