Precision Turbo and Engine BigStuff3 GEN3 Engine Torque Management (ETM) System - Manual (Page 3)

What Else is Needed?
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
min (to 1K max), .125 Watt min (to 2 Watt max) resistor is needed.
BigStuff3’s ETM system requires, but does not include provisions for sensing driveshaft speed. 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) or you can use MSD PN 8159.
BS3 Part # JMI-003 -014
Sensor tip
(threaded)
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. Link
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 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.
You’ll also need the 2 way Metric-Pack connector Packard# 12103784 w/terminal PN 12089188.
How to Install the System
This module plugs into the
MSD ignition modules,
where the rev limit chips
plug in. The red LED will
illuminate if installed
correctly.
• The Bigstuff3 ETM module plugs into the
following MSD ignition modules, where the rev
limit chips plug in.
Note: These are the only MSD ignition systems
supported to date by BS3.
o MSD 8
Rev 1.1 3
This connector plugs into
the connector in the main
BigStuff3 wire harness
labeled “GM HEI”.