GM's 6L80 HP Tuning, DoD, and Torque Converters! Part 3 of 3

Introduction

This tutorial provides a step-by-step guide on tuning the GM 6L80 transmission using HP Tuners. It focuses on modifying key parameters such as disabling Displacement on Demand (DoD), adjusting the torque converter clutch lockup strategy, and optimizing slip speed and TCC apply pressure. This guide is particularly relevant for those looking to enhance the performance of their 2016 Silverado or similar vehicles with the 6L80 transmission.

Step 1: Download and Install HP Tuners

• Visit the HP Tuners website to download the software.
• Follow the installation prompts to install HP Tuners on your computer.
• Ensure you have the necessary drivers installed for your vehicle's OBD-II interface.

Step 2: Connect to Your Vehicle

• Use an OBD-II scanner or HP Tuners interface to connect to your vehicle.
• Turn on the ignition without starting the engine to power the scanner.
• Open the HP Tuners software on your computer.

Step 3: Read the Vehicle’s Current Configuration

• In HP Tuners, navigate to the “Read” option to download the current tune from your vehicle’s ECU.
• Save the file with a distinct name to keep track of different configurations.

Step 4: Disable Displacement on Demand

• Locate the section for DoD settings in the HP Tuners software.
• Change the DoD setting from 'Enabled' to 'Disabled.'
• This change will prevent the engine from switching to four-cylinder mode, thus enhancing performance under load.

Step 5: Adjust the Torque Converter Lockup Strategy

• Find the torque converter settings within the HP Tuners interface.
• Modify the lockup strategy to suit your driving preferences. Common adjustments include:
  • Increasing the lockup engagement speed.
  • Adjusting the lockup release speed to prevent slipping.
• Ensure these settings are aligned with your vehicle's performance goals.

Step 6: Change Slip Speed and TCC Apply Pressure

• Navigate to the torque converter clutch (TCC) settings.
• Adjust the slip speed to optimize how quickly the clutch engages and disengages. Typical values may vary based on personal preference and driving style.
• Modify the TCC apply pressure to enhance the clutch engagement. Ensure the pressure is not set too high to avoid premature wear.

Step 7: Save and Write the New Configuration

• Once all adjustments are made, save your new configuration.
• Use the “Write” function to upload the modified tune back to your vehicle’s ECU.
• Ensure the engine is turned off during the writing process, and follow any prompts provided by the software.

Conclusion

In this tutorial, we covered the essential steps for tuning a GM 6L80 transmission using HP Tuners. By disabling DoD, adjusting the torque converter lockup strategy, and optimizing slip speed and TCC apply pressure, you can significantly enhance your vehicle's performance. For further exploration, consider reviewing the first two parts of the series for additional context on DoD and torque converter issues. Happy tuning!