Duramax LLY Tuning (2004–2005)

Duramax LLY Tuning (2004–2005)

The LLY introduced variable geometry turbocharger (VGT) technology to the Duramax lineup, giving it excellent spool characteristics and strong mid-range power. With the right ECM and TCM tune, the LLY becomes an even more capable and responsive truck — whether you're towing, daily driving, or building for performance.

ECM Tuning

LLY ECM tuning optimizes VGT turbo control, fueling, timing, and torque management for improved power and drivability across all RPM ranges.

  • VGT turbo vane position and boost optimization
  • Fueling and timing calibration
  • Torque management removal
  • Power, tow, and economy calibrations available
  • Supports deleted and emissions-intact builds

TCM Tuning

Match your ECM tune with a TCM calibration to keep your Allison transmission performing at its best under increased torque loads.

  • Shift point and pressure optimization
  • Torque converter lockup tuning
  • Matched to your ECM calibration for seamless drivability

Supported Platforms

  • EFI Live — Full ECM & TCM read/write with DSP5 switch support

Ready to tune your LLY? Contact us to discuss your build and get the right calibration for your truck.