Precision Turbo and Engine BigStuff3 GEN3 1st Gear Spark Retard with Traction Control System (SR2) - Manual (Page 4)

Rev 1.0 4
maximum and a .125 Watt min (to 2 Watt max) resistor is needed. A resistor is not required with the
MSD Super 8 ignition system.
Installation of the relay will be addressed later in this manual.
How to Install the SR
2
System
The SR
2
Harness Installation
o Connect the SR
2
harness header connector to the GEN3 ECU header connector marked “SR
2
”.
Tighten the harness side header bolt to 15 inch lbs.
o Connect the two-way connector labeled “Driveshaft” to the driveshaft speed sensor (not supplied
with the system, but available from BS3). See the “What else is Needed” section above for more
details. Install the 2 way Metri-Pack Packard connector PN 12103784 (w/terminals PN
12089188) onto the driveshaft sensor and plug it into the SR
2
harness.
o Connect the “Ground” wire to the frame near the driveshaft speed sensor along with the sensor
ground.
o Connect the “Data (DAE) Trigger” Wire (from ECU header connector Hdr2 Y2) to a 12V
switched source on the vehicle dash (see the relay wiring diagram in the next section).
o Connect the “Timer Enable” wire (Hdr. 1, L2) to a relay, with its own On/Off switch after the
relay and before the timer enable input to the ECU. The relay will invert the trans-brake signal
(see the relay wiring diagram in the next section). This wire must have 12 Volts applied to it
once the trans-brake/footbrake/clutch is released to start the timers in the ECU. The Timer
Enable On/Off switch must not be turned on until after the water burnout.
o If using the Starting Line Timing and/or Starting Line VE functionality, connect the “3-Step
Enable” wire (Hdr. 2, W1) to the trans-brake or clutch pedal (see the relay wiring diagram in the
next section).
Relay Wiring Using a Bosch 40 Amp Relay
Important Note: The SR
2
1
st
Gear Retard system allows only one Timer Enable activation . To eliminate
the potential of activating the Timer Enable wire during the pre-stage burnout, put the Timer enable wire on
its own On/Off switch. After the burnout, turn on the switch. If the Timer Enable wire is inadvertently
activated, the ignition must be cycled off, then on again (for more information, see the relay wiring diagram
in the next section).
Ground eyelet
Header connector goes
to GEN3 ECU Header
marked SR 2
DAE trigger wire
2-wire driveshaft speed
sensor connection
3-Step Enable wire. Can be
used for Starting Line
Timing and or Starting Line
VE functionality