VW AG DQ250 Example ROM Description

Owned by Lucan Hetherington
Last updated: Oct 04, 2022
7 min read

Introduction

Available for reference is an example ROM for tuning tested on EcuTek's development vehicle (MK7 Golf R). this particular gear box was standard except for the Dodson clutch pack used to help with increased torque handling capacity.

This Example TCM file seeks to address the following points:

  • Increased clamp pressure at full load engine torque.

  • Remove Torque limitation & Rev Limits sent to ECM.

  • Tweak on shift routines.

  • Tweak on shift times.

  • Tweak on shift torque reduction times.

  • No forced KD in manual mode.

  • No forced KD in lower gears.

  • Revised kiss points.

  • Increased LC rev limit using TCU setpoint.

  • Manual shift in LC.

  • Option to run LC with ESP on in manual mode

Breaking down the map changes into categories for the above features is described below.

Clutch Pressure Increase

The following maps were changed to help with achieving the desired clutch pressure increase and reduce clutch slip.

  • Line Pressure Offset Compensation

    • Increased at normal temperatures mid to high RPMs

  • Line Pressure Set Point (Torque)

    • Raised to 23.5 bar to give enough headroom to clamp the clutches at higher pressure

  • Line Pressure Solenoid Current Set Point

    • Rescaled to allow for higher pressure target and lowered low target current targets to improve pressure control

  • Main Pressure offset for Target Pressure

    • Increase at 20bar clutch pressure to maintain line pressure at higher clutch pressures

  • Main Pressure Temp. Compensation

    • Reduced at low fluid temperatures to stabilise the target line pressure

  • Max. Duty cycle of Solenoid valves

    • Increased to 75% to allow for higher current and achieve higher pressures

  • Max. Permitted Clutch Pressure for Diagnosis

    • Increased to 25 bar to prevent over pressure diagnosis faults at higher target pressure

  • Maximum Line Pressure

    • increased to 25Bar to allow higher line pressure target.

  • Pressure Sensor Output Voltage Max

    • Raised to prevent sensor voltage errors when running higher pressures

  • Solenoid 1 & 2 Maximum Current for Max. TQ

    • Increased to 2000mA to drive the solenoid hard enough to produce the desired target pressures.

  • Clutch 1 & 2 target torque Correction

    • Increased at higher torque inputs to prevent the calculated clutch torque from dropping and requesting less target pressure

  • Leakage Control Integral Current Limit Mon

    • Current adjustment learning integral correction limit for monitoring

  • Leakage Control Integral Current Limit

    • Current adjustment learning integral correction value limit

  • Leakage Control Prop Current

    • Current adjustment learning Proportional correction limit

  • Clutch 1 & 2 Current Offset

    • Offset to the solenoid current to help achieve the desired clutch pressure, increases at high torque request and normal fluid temperatures only.

Torque & Rev Limit Increase

  • Max Torque at Eco Mode

    • This value was reduced to maintain eco mode drivability

  • Max Torque at Full Load

    • Increased to 700Nm to delimit the ECM

  • Max Torque at Normal Mode

    • Increased to 700Nm to delimit the ECM

  • Max Torque at Sport Mode

    • Increased to 700Nm to delimit the ECM

  • Max Torque at TipTronic Mode

    • Increased to 700Nm to delimit the ECM

  • Max. Temperature for Gearbox Protection

    • Increased from 350 to 650Nm below 138degC

  • Max. TQ for Gearbox Protection

    • Raised to 814Nm to allow the ECM full range of torque demand

  • Maximum Engine Speed

    • Increased to 7200RPM to match ECM rev limit

  • Maximum Torque Clutch 1 & 2

    • Set to 655Nm (number size limit here) this value cannot be increased further without RaceROM custom code.

  • Maximum TQ when Shifting Circuits

    • The maximum torque allowed when the shift fork is moving increased to 65Nm

  • Torque maximum during starting (pull away)

    • Increased to 2000nm/s at normal operating temperatures to allow for quick torque increases when pulling away from standstill.

  • Pre Control Torque Limit, P part & I part

    • Increased to 655Nm to accommodate for higher initial torque targets.

  • Forced Upshift RPM 1 -> 2 -> 3 -> 4 -> 5 -> 6 (Drive, Sport, Torque & TipTronic)

    • Raise to the 7000RPM (the ECM Rev limit)

Shift Schedules Adjustment

Adjustments to shift schedules can be done in using a few different methods, some more indepth than other, in this example a simple accel pedal axis and shift RPM changes were made in Drive mode, very few changes were made to ECU and Sport schedules as there are deemed to be OK.

  • Downshift Schedule (ALT Dive & ECO) for all Downshifts (6 → 1)

    • The Data and axis of these maps has been adjusted to achieve a slightly higher accel pedal value for the same downshift limit so that the car shifts downshifts a little earlier. More changes have been made to the drive maps as the ECO and Sport schedules are usually deemed OK.

  • Upshift Schedule

    • The Data and axis of these maps has been adjusted to achieve a slightly higher accel pedal value for the same downshift limit so that the car shifts downshifts a little earlier. More changes have been made to the drive maps as the ECO and Sport schedules are usually deemed OK.

  • Max Nominal Gradient for Downshifts in TT

    • Increase to allow for shifts whenever the TripTronic shifter is pulled

  • Upshift Inhibit Torque Threshold

    • Increased to 6000 to allow high torque upshift’s

  • Max Nominal Gradient for Downshifts in TT

    • RPM gradient set to 7500RPM/sec to increase the range and speed of the shift when triggered by paddle pressing

  • Multiple Downshift & Upshift Suppression Time

    • set to 0 to allow multiple upshift and downshifts when ever you request them.

COBB have a very good sheet on a different method to set up the shift schedules, you can read their Shift schedule documentation here.

Volkswagen MQB 6 Speed DSG Tuning Guide

Shift Times Adjustment

  • Maximum overlap torque difference

    • Increases to 1200Nm/sec to allow for quicker torque ramp rate during gearshifts

  • Maximum Overlap Torque Gradient Incoming & Outgoing Clutch

    • Increases to 1200Nm/sec to allow for quicker torque ramp rate during gearshifts

  • Minimum overlap torque difference

    • Increased to 210Nm/s to allow for higher torque overlap during the shift to increase the shift speed

  • Switch Times D ECO TQ Red. Pedal based

    • Reduced to allow allow for quicker shifts

  • Switch Times D Normal TQ Red. Pedal based

    • Reduced to allow allow for quicker shifts

  • Switch Times S Pedal based

    • Reduced to allow allow for quicker shifts

  • Switch Times S TQ Red. Pedal based

    • Reduced to allow allow for quicker shifts

  • Switch Times TT Pedal based

    • Reduced to allow allow for quicker shifts

  • Target An Actual TQ Diff To Trigger An Error State

    • Raised to 655Nm to prevent DTC for torque differences.

Kick Down Prevention

  • Kickdown Switch (Tiptronic SW)

  • Min. Accel Pedal for a Kickdown

Kiss Point (Stall Speeds) adjustment

These Maps have been reduced slightly at high Accel Pedal values to improve clamping at lower speeds

  • Clutch Stall Speed (Drive) (2nd Gear)

  • Clutch Stall Speed (Drive) (3-6 Gear)

  • Clutch Stall Speed (Reverse) (T0)

  • Clutch Stall Speed (Reverse) (T1)

  • Clutch Stall Speed (Reverse) (T2)

  • Clutch Stall Speed (Sport) (2nd Gear)

  • Clutch Stall Speed (Sport) (3-6 Gear)

  • Clutch Stall Speed (Sport) (T0)

  • Clutch Stall Speed (Sport) (T1)

  • Clutch Stall Speed (T0)

  • Clutch Stall Speed (T1)

  • Clutch Stall Speed (T2)

  • Clutch Stall Speed (TT) (2nd Gear)

  • Clutch Stall Speed (TT) (3-6 Gear)

  • Clutch Stall Speed (TT) (T0)

  • Clutch Stall Speed (TT) (T1)

  • Clutch Stall Speed (TT) (T2)

  • Stall Speed Max 2nd and above

Launch Control Changes

  • Max. TQ Gradient for LC Engagement

    • Set to 20000Nm/sec to allow immediate LC torque gradient increases

  • Maximum torque increase during LC

    • Set to 20000Nm/sec to allow immediate LC torque gradient increases

  • Brake Pedal Pressure to Enable LC

    • reduced to 60 bar to enable LC with less brake pressure

  • Exit LC duirng ESP Activation

    • set to 1 to enable ESP on Launches

  • Launch Control Selector Sw. Activated when in D or S

    • Unchecked to allow LC only when in manual mode

  • Maximum Torque (Launch Control)

    • set at 700Nm to allow for full torque when launching

  • Stall Speed & ESP (Launch Control)

    • Set to 4500RPM above 85% accel as this is a good medium point for Launch control RPM setpoint.

Adaptions

These values are adjusted (generally raised the limits up) to allow the clutch pressure learning enough range to produce the correct pressures.

  • Clutch 2 Slip adaption type 0 (default)

  • Clutch 1 Micro Slip adaption type 0 (default)

  • Clutch 1 Micro Slip adaption type 0 (Max)

  • Clutch 2 Micro Slip adaption type 0 (default)

  • Clutch 2 Micro Slip adaption type 0 (Max)

  • Clutch 1 Adaption type 0 Current Offset for temperature

  • Clutch 2 Adaption type 0 Current Offset for temperature

  • Clutch 1 Macro Slip adaption type 1 (default)

  • Clutch 1 Macro Slip adaption type 1 (Max)

  • Clutch 1 Micro Slip adaption type 1 (default)

  • Clutch 1 Micro Slip adaption type 1 (Max)

  • Clutch 2 Macro Slip adaption type 1 (default)

  • Clutch 2 Macro Slip adaption type 1 (Max)

  • Clutch 2 Micro Slip adaption type 1 (default)

  • Clutch 2 Micro Slip adaption type 1 (Max)

Misc Changes

There are a number of other map changes to help with other aspects of the gearbox tune.

  • Accel Pedal Characteristic during Speed Control

  • CAN Sw. for Broadcasting Gear in Instrument Cluster

    • this value is se to “1” so the gear is displayed in every drive mode

  • Enable Torque For Fast Engagement

  • Fast Off Function Pedal threshold (S-mode)

  • Upshift Speed Monitoring enable RPM

  • Max RPM sync value on Output Shaft Speed failure

  • Output Shaft Speed sensor diagnosis VSP threshold

  • Max Filling for Full Load Burble

  • Friction Coeff. Corr. Clutch Drv. Spd Factor

  • Friction Coeff. Correction Clutch RPM Factor

  • Judder Warning timer

  • Start Circuit Accel Pedal Hysteresis

  • Speed Limiter Integral Factor

  • Speed Limiter Prop Factor

  • Eng Speed Limiter In Neutral

  • Output Speed Threshold for 5th gear engagment limp

  • Speed Limiter Calc time

There are a number of changes that may not need to be included depending on what you want to do with the TCM tune. However this diff file contains all of the changes set up in the Example_DQ250A_MQB_2016_Golf R_0D914Q_5006_EddieMap_DodsonClutchPack ROM.

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