Precision Turbo and Engine BigStuff3 GEN3 PRO SEFI (LS1) System Hardware & BigComm Software User Manual
Page 18
BigStuff3 Pro SEFI System (LS1)
Version 1.0
17
The WBO2 sensor threads into the sensor mounting bung [(optional) (see picture below)], which
needs to be drilled and welded into the exhaust pipe. Before drilling and welding read the design
guidelines below.
• Install mounting bung approximately 8” – 12” from where the primary pipes enter the
exhaust collector.
• Make sure the mounting location selected does not allow condensation to collect directly
in front of the sensor. Make sure there are no depressions, projections, edges, etc. in the
exhaust pipe near the sensor tip.
• The mounting angle of the sensor should be tilted a minimum of 10
o
to the horizontal tip
of the sensor. The tip of the sensor must be tilted down. See the diagram below. The
optimum sensor angle is 90
o
.
• Make sure sensor cabling is routed and secured away from the exhaust system.
Stainless steel mounting bungs are also available for turbocharged applications.
Drill a 7/8” – 15/16” hole in the exhaust pipe. Weld a WBO2 sensor-mounting bung into the
exhaust pipe. The mounting bung was manufactured with a lip to help locate it prior to welding
it to the exhaust pipe. The entire circumference of the mounting bung must be welded and free
of exhaust leaks! Contact your BigStuff3 dealer to procure a mounting bung.
Once the sensor-mounting bung is welded into place, thread the sensor
into the bung. Installation torque is about 10 – 15 ft/lbs. Connect the oxygen sensor 6-way
connector (with gold plated terminals) to the main wire harness.
10
o
angle, minimum
Oxygen Sensor
Oxygen sensor mounting
bung (entire circumference
needs to be welded)
Exhaust Pipe
The optimal
angle is
completely
vertical or 90
o
This side (with the mounting lip) goes into the
exhaust pipe to locate it prior to being welded