Precision Turbo and Engine BigStuff3 GEN3 1st Gear Spark Retard with Traction Control System (SR2) - Manual (Page 13)

Rev 1.0 13
Important Note:
To ensure that the 1
st
Gear Retard system becomes active when the trans-brake or clutch
are released (the point in time when the Timer Enable wire is supplied 12V), make sure the Minimum RPM
& TPS values are exceeded while on the MSD 2/3-Step when the trans-brake is on or the clutch is depressed.
Setting up the Timing Retard Traction Control System
The first step in setting up the Timing Retard Traction Control System is to configure Driveshaft Error Table.
The other necessary parameters were configured, while setting up the “1
st
Gear Retard” system.
Driveshaft Error Table Configuration
The difference between the “actual” and “desired” driveshaft speed is called “Driveshaft Error”. The GEN3
ECU uses a “Driveshaft Error” table to determine how much spark retard to apply for a given level of
driveshaft error. The driveshaft RPM error range in the table goes from zero (0) RPM error to 896 RPM
error. Each cell represents 128 RPM of driveshaft error. A linear interpolation is used by the GEN3 ECU
between rpm cells.
Shows 1 st Gear Retard system is functional per time
period defined in calibration (1.1.seconds). After 1.1
seconds, the system enters the blend period
1 st Gear Retard
Period from Timer
Enable “ON” point.
Hit “Z” to zero out
the cursor
Blend time period and the slope of the line are
defined by the number of “Counts” inputted into the
“Blend Rate” cell under Boost Parameters