Transbrake Enable/Disable- Realtime

A real time table to activate or disable the transbrake system.  All ROM's have it active by default, to change the state you'll need to be either live connected to the vehicle in Accesstuner Pro/ Accesstuner.  Or utilize the Accessport's adjustments menu to disable it.

Load Target

We have created a custom transbrake-specific load targeting system to offer ultimate launching control without influencing power available while driving.  When transbrake is engaged, and accelerator pedal position has exceeded the table value for 'Transbrake Load Target Pedal Threshold', load targets will be hijacked by the custom transbrake load targets.

Transbrake Load Target (1st Gear)

This table shows the translation of APP into Load requests while transbrake is active in 1st gear, after the Transbrake Load Target Pedal Threshold value has been eclipsed.  While this load limit is active, Airflow Limit Src. = 5 (LSPI) and Load Desired (TQ Control)  = (this table) + (Load Target User Adjust offset).

Transbrake Load Target (2nd Gear)

This table shows the translation of APP into Load requests while transbrake is active in 2nd gear, after the Transbrake Load Target Pedal Threshold value has been eclipsed.  While this load limit is active, Airflow Limit Src. = 5 (LSPI) and Load Desired (TQ Control)  = (this table) + (Load Target User Adjust offset).

Transbrake Load Target Pedal Threshold

This APP value will determine the changeover point where Transbrake Load Targets will hijack load requests.  Under this APP value, load control will be handled as it normally is while driving via throttle requested torque, load limits, etc.  Above this APP, the load target values will be replaced by those found in the tables 'Transbrake Load Target (1st Gear)' or 'Transbrake Load Target (2nd Gear)', depending on the currently selected gear.

Transbrake Load Target User Adjust- Realtime

User Adjustment done on the Accessport or while live-connected to the vehicle.  Value persists after key-cycling.  This load offset will be added or subtracted from Transbrake Load Target (1st Gear) or Transbrake Load Target (2nd Gear).  Default load offset is 0.0%

Transbrake Load Target User Adjust (Max)

This defines the upper limit of the user's ability to increase load above the Transbrake Load Targets.

Transbrake Load Target User Adjust (Min)

This defines the lower limit of the user's ability to decrease load below the Transbrake Load Targets.

Safety Thresholds

In order to avoid unnecessary drivetrain abuse, we have created a handful of safety factors to either inhibit or exit the transbrake feature.  You will be able to tell that a safety has been triggered when RPM is limited to 1000RPM to decrease engine load; the transbrake will continue holding the car stationary until the left paddle is released.  You can also rely on the monitors Transbrake Safety Source and Transbrake Inhibit Source to identify the safety that was triggered.

Active Time (Max)

When transbrake is engaged, a timer starts; when that timer exceeds the value found in this table, the safety system will be triggered.  Safety/Inhibit source will be 7 if this occurs.

Clutch Slip (Max)

When transbrake is engaged, the ECU will continuously monitor the slip of the reverse clutch pack.  If clutch RPM exceeds the value found in this table, the safety system will be triggered.  This slip safety can only be tripped while the user is NOT bumping or creeping with staging control.  Safety/Inhibit source will be 6 if this occurs.

Engine Coolant Temp (Hysteresis)

The hysteresis for the transbrake ECT upper and lower safety limits.

Engine Coolant Temp (Max)

ECT (Min) and (Max) tables determine the active range for transbrake.  If ECT is outside of this range either before transbrake is engaged, or falls outside of this range while transbrake is engaged, the safety system will be triggered.  Safety/Inhibit source will show a value of 3 if this occurs.

Engine Coolant Temp (Min)

ECT (Min) and (Max) tables determine the active range for transbrake.  If ECT is outside of this range either before transbrake is engaged, or falls outside of this range while transbrake is engaged, the safety system will be triggered.  Safety/Inhibit source will show a value of 4 if this occurs.

Knock Count (Max)

If the cumulative knock count total across all cylinders exceeds the count found in this table while transbrake is active, the safety system will be triggered.  Safety/Inhibit source will show a value of 5 if this occurs.

Transmission Fluid Temp (Hysteresis)

The hysteresis for the transbrake TOT (transmission oil temperature) upper and lower safety limits.

Transmission Fluid Temp (Max)

TOT (transmission oil temperature) (Min) and (Max) tables determine the active range for transbrake.  If TOT is outside of this range either before transbrake is engaged, or falls outside of this range while transbrake is engaged, the safety system will be triggered.  Safety/Inhibit source will be 1 if this occurs.

Transmission Fluid Temp (Min)

TOT (Min) and (Max) tables determine the active range for transbrake.  If TOT is outside of this range either before transbrake is engaged, or falls outside of this range while transbrake is engaged, the safety system will be triggered.  Safety/Inhibit source will be 2 if this occurs.

Transbrake Bump Ramp Out Time

This ramp out time will slowly decay the bump reverse clutch-pack line pressure change back into a fully-stopped transbrake.  Even with this, the vehicle will rock basically no matter what when bumped.

Transbrake Bump Time- Realtime

User Adjustment done on the Accessport or while live-connected to the vehicle.  Value persists after key-cycling.  This will determine the duration of time over which line pressure to the reverse clutch-pack will be reduced when bump is active.  Default bump time is 20ms.

Transbrake Creep Integral Gain

This table controls the integral component of the PI error control for the creep mode clutch slip target RPM.

Transbrake Creep Pressure (1st Gear)

This is the feed-forward table for reverse clutch-pack line pressure to achieve the creep mode slip target RPM, in 1st gear.  Lower pressure to the reverse clutch-pack will allow for more clutch slip.

Transbrake Creep Pressure (2nd Gear)

This is the feed-forward table for reverse clutch-pack line pressure to achieve the creep mode slip target RPM, in 2nd gear.  Lower pressure to the reverse clutch-pack will allow for more clutch slip.

Transbrake Creep Pressure User Adjust- Realtime

User Adjustment done on the Accessport or while live-connected to the vehicle.  Value persists after key-cycling.  This pressure offset will be added to the feed-forward table output.  Default pressure offset is 0 psi.

Transbrake Creep Proportional Gain

This table controls the proportional component of the PI error control for the creep mode clutch slip target.

Transbrake Creep Ramp Out Time

This ramp out time will slowly decay the creep reverse clutch-pack line pressure change back into a fully-stopped transbrake.

Transbrake Creep Slip Target - Realtime

User Adjustment done on the Accessport or while live-connected to the vehicle.  Value persists after key-cycling.  This is the target slip RPM for the reverse clutch pack while creep mode is active.  Increasing slip RPM will create a faster creep, decreasing slip RPM will create a slower creep.

Transbrake Staging Mode- Realtime

User Adjustment done on the Accessport or while live-connected to the vehicle.  Value persists after key-cycling.  This adjustment controls whether bump mode or creep mode are active.