User guide

Rev 1.0
3
What the System Includes and its Capabilities
• The (SR
2
) wire harness – This harness allows a driveshaft speed sensor to be incorporated into the system.
• Embedded control software to control ignition timing retard, including user defined control and
configuration tables. The functionality of these tables will be explained later in this manual.
The SR
2
system also includes the “Extended Replay” data acquisition option, which can log data from
eighteen (18) seconds to approximately five (5) minutes.
What Else is Needed?
• A driveshaft speed sensor
• A four (4) magnet pickup ring
• A relay to redirect the 12V signal from the trans-brake or clutch to the Timer Enable wire
BigStuff3’s SR
2
system requires, but does not include provisions to mount a driveshaft speed sensor. If you
purchased the GEN3 system with transmission control for the GM 4L60E or 4L80E automatic transmissions,
a driveshaft speed sensor is not required
. For all other applications, provisions for detecting the driveshaft
speed will need to be made. BigStuff3 offers a driveshaft speed sensor assembly under part number JMI-
007-014 (see photo below).
In addition to the driveshaft speed sensor, a pick-up wheel and sensor mounting bracket are required.
BigStuff3 suggests using Mark Williams’ four (4) magnetic (driveshaft) ring. This is the link to the
suggested part - http://www.markwilliams.com/driveshaftPickups.aspx?CategoryID=266.
Note: Make sure all of the magnets in the magnetic ring are all installed in the SAME direction. A .080” -
0.100” air gap between the sensor and magnetic ring is recommended. A sensor mounting bracket will need
to be purchased or fabricated to mount the sensor.
If using a MSD8 CD ignition box, a pullup resistor needs to be installed between the ignition (+12V)
post and Mag + post on the side of the MSD8 ignition box! A minimum of a 900 Ohm to 1K
BS3 Part # JMI-003 -014
Sensor tip
(threaded)