Precision Turbo and Engine BigStuff3 GEN3 1st Gear Spark Retard with Traction Control System (SR2) User Manual
Page 2
Rev 1.0
2
System Description
1st Gear Spark Retard with Spark Retard Traction Control System (SR
2
) -
SR
2
uses two independent
timing retard systems to control driveshaft speed. Both systems are triggered and function simultaneously
when 12V is applied to the Timer Enable wire (12V redirected from the trans-brake or clutch). The first gear
timing retard system also has “Time-out” and “Blend” features. The “Time-out” feature helps to eliminate
“sticking” the tire. The “Blend” feature ramps the retard timing back to zero. Both features are user
configurable.
The second timing retard system works in conjunction with the 1
st
Gear retard system and can intervene at
any time. The second timing retard system controls driveshaft speed for an eight (8) second time period.
The system compares the driveshaft speed sensor input to the user desired driveshaft curve to control the
driveshaft speed. The driveshaft speed is managed by the ECU using a user defined Driveshaft Error table.
Driveshaft error is the difference between the desired driveshaft speed and the actual driveshaft speed. If the
actual driveshaft speed exceeds the desired speed, the ECU applies the timing retard value from the user
defined Driveshaft Error table. In order to start the timers, the minimum TPS and RPM criteria must be
satisfied (under Boost Parameters). The MSD or equivalent ignition system must be used for the 2-Step/3-
Step functionality, since the SR
2
system does not include the BS3 ETM module. There are no restrictions on
the type of MSD ignition system that can be used with the SR
2
System.
Table of Contents
Section
Page(s)
1
System Description
2
2
Table of Contents
2
3
What is Included
3
4
What Else is Needed
3
5
System Hardware Installation
4
6
• Driveshaft sensor and magnet ring installation
4
7
• SR
2
system wire harness installation
4
8
System/Relay Wiring
5 - 6
9
• Data Trigger wire
5 - 6
10
• Timer Enable wire
5 - 6
11
o
Inverted relay
5 - 6
12
o
Timer Enable On/Off Switch
5 - 6
13
• Starting Line Timing & VE
5 - 6
14
• Clutch or trans-brake switch
5 - 6
15 1
st
Gear Retard System Setup
6
16
• Torque Parameters Configuration
7
17
o
Enable/Disable Torque Control
7
18
o
Driveshaft Error Traction Control Mode (Timing Retard Mode)
7
19
• Boost Parameters Configuration
7
20
o
Minimum RPM & TPS
8
21
o
Spark Retard Mode
8
22
o
1
St
Gear RPM & Retard Configuration (using tables and graph)
8 – 11
23
o
1
st
Gear Override (“Time-out” feature)
12
24
o
Blend Rate (“Blend” feature)
12
25 Timing Retard Traction Control System Setup
13
26
• Configuring the Driveshaft Error Table
13 – 14
27
• Developing the Desired Driveshaft Curve
14 – 16
28
o
SR
2
Replay Signal Definition
16 – 17
29 ¼ Pass – Timing Sequence
17
30 Interrupting SR
2
System Replay Graphs
18 – 19
31 Important Software Instructions & Notes Summary
19 – 21