VW AG DQ381 Example ROM Description

Owned by Lucan Hetherington
Last updated: Dec 02, 2022
5 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.

  • Ahd_PGetr_SchwellePKup_ko Main pressure threshold at which the maximum clutch pressure is switched from stage 1 to stage 2 in the "KV open pressure" state

  • Clutch 1 & 2 Pressure Gain (Integral)

  • Clutch 1 & 2 Pressure Gain (Proportional)

  • Clutch Current Pressure Threshold

  • Clutch Monitor Pressure Threshold

  • Clutch Pressure Offset

  • Kre_GrNpKi_kf - Map for the amplification of the I controller depending on the engine torque and hydraulic temperature

  • Kre_GrNpKp_kf- Map for the amplification of the P controller depending on the engine torque and hydraulic temperature

  • Kus_PKupOfs_PKupZuKlein_ko - Clutch Pressure Offset?

  • Main Pressure Requirement

  • Max ADC Value for Clutch Pressure

  • Maximum Allowed Clutch Pressure

  • Maximum Clutch Pressure for Actuator Movement

  • Maximum Clutch Pressure Stage 1 & 2

  • Maximum Permissible Clutch Pressure

  • Maximum Pressure Clutch 1 & 2

  • Maximum Target Clutch Pressure

  • Oil Pressure Main

  • Target Main Pressure (OPL_3266)

  • Target Pressure P4 1 & 2

  • Upper Pressure Limit Clutch 1 & 2 Characteristic

  • Valve Current Compensation Max - Clutch

  • Valve Current Max - Clutch Coupling

  • Valve Current Max - Clutch

  • Valve Current Max - Gear adjuster

  • Valve Current Max - Main Pressure

  • Valve Current Max - Oil Cooling

  • Valve Current Max - Partial Transmission

Torque & Rev Limit Increase

To increase the allowable torque in the gearbox, lift the allowable input torque sent to the ECM and Increase the rev limit set by gear shifting the following maps were changed in the DQ381

  • Engine Torque Maximum for Activation

  • Engine Torque Maximum for Deactivation

  • ISTMOMENT_NN_EMA - Actual torque in depleting mode

  • KreGr_KompAV_GewMMot_Max_kl - Maximum weighting via the engine torque to compensate for the displacement of the aggregate

  • Maximum Torque (clutch open)

  • Maximum Torque (gearbox protection)

  • Maximum Torque (Launch Control)

  • Maximum Torque (temperature)

  • Maximum Torque Clutch 1

  • Maximum Torque Clutch 2

  • Maximum Torque Rate of Change (Input Shaft Differential Speed)

  • Maximum Torque Rate of Change (Launch Control)

  • Maximum Torque Rate of Change

  • Mmr_MDekr_Asg_ko - Torque decrement for intervention reduction ramp with active ASG circuit

  • Target Torque P4 1 & 2

  • Torque Actual(Efficiency)

  • Torque Actual

  • Torque Limit(Depleting)

  • Torque Limit(Efficiency)

  • Torque Limit

  • Torque Reduction After Driver Demand

  • Upper Torque Limit for Motor Controllers

Forced upshift, downshift & Rev Limit map changes

  • Forced Downshift Speed (Tip)

  • Forced Downshift Speed 2

  • Forced Upshift Speed (Tip)

  • Forced Upshift Speed Motor Protection

  • Max Engine Speed for Manual Gear Selection

  • Maximum Engine Speed 1st Gear

  • Maximum Engine Speed 2nd Gear

  • Maximum Engine Speed 3rd Gear

  • Maximum Engine Speed 4th Gear

  • Maximum Engine Speed 5th Gear

  • Maximum Engine Speed 6th Gear

  • Maximum Engine Speed in Neutral

  • Minimum Gear for TIP Upshift

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.

Sadly ProECU doesn’t currently handle arbitrary text in map Axis value so the axis of the shift maps are currently numbered 1 to 21

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

0%

6%

13%

19%

25%

31%

38%

44%

50%

56%

63%

69%

75%

81%

88%

94%

100%

Kick Down

Normal 

Below

Above

and 1 to 14.

1

1->1

2

1->2

3

2->1

4

2->3

5

3->2

6

3->4

7

4->3

8

4->5

9

5->4

10

5->6

11

6->5

12

6->7

13

7->6

14

7->7

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 7 Speed DSG Tuning Guide

Shift Times Adjustment

  • Clutch Overlap Time (Tip Gear2 -> 7)

  • Clutch Overlap Time (Tip Tq Gear2 -> 7)

  • Maximum Switch Time(Drive)

  • Maximum Switch Time(Sport)

  • Maximum Switch Time(Tip)

  • Shift Time for 3 Factor Rollout

  • Shift Time for 4 Factor Rollout

  • Switching Time in ECO (Push)

  • Switching Time in ECO

  • Switching Time in Max Accel Mode 1 & 2

  • Switching Time in Sport (and Sport Push)

  • Switching Time in Tip (and Tip Push)

  • Target Gear Change Time (Maximum Acceleration)

  • Target Gear Change Time (Sport) and (alt)

  • Target Gear Change Time (TT) & alt)

  • Upshift Paddle Delay

Kick Down Prevention

Kick down Prevent is not done using the Shift schedule maps as per the above notes. It appears that the Kickdown vehicle speed is the value in the “Kick Down” column and the Accel pedal thresholds are the “Above” and “Below” columns

Other maps also need to be changed for the TipTronic setpoints

  • Kickdown in TIP Mode Enable

  • Kickdown Set Point in Max Accel Mode

  • Minimum Pedal Position for 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(2nd Gear)

  • Clutch Stall Speed(Drive)

  • Clutch Stall Speed(Reverse)

  • Clutch Stall Speed(Sport)

  • Maximum stall speed for temperature range 0, 1 & 2

 

Launch Control Changes

  • Brake Pressure Filter Time (Launch Control)

  • Brake Pressure Filter Time for Launch Control

  • Brake Pressure For Launch Control Release

  • Clutch Torque for LC Activations

  • Kra_EnASR_LC_ko - Activation of ASR reaction at LC start

  • Launch Control Activation (TT)

  • Minimum Brake Pressure (Launch Control)

  • Stall Speed (Launch Control)

Misc Changes

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

  • Disable Gear Display Number

  • Enable Gear Display

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_DQ381F_2019_Golf GTI PP 0GC20G_2404_enc.bin (C:\EcuTek\Stock ROMs\Volkswagen\Mk7.5\DSG\DQ381 Example ROMs).

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