EFI Live and Autocal are the two most popular tuning platforms for Duramax diesel trucks. Whether you’re chasing power, improving fuel economy, or cleaning up emissions-related issues — understanding which platform fits your needs makes all the difference.
EFI LIVE FLASHSCAN V2
- The professional’s tool — used by tuners worldwide for Duramax applications
- Connects to OBD2 and reads/writes directly to the ECM and TCM
- Full calibration editing via VCM Suite software on PC
- Best for: tuners writing custom calibrations, advanced users who want full control
- Requires tuning knowledge to use effectively — not a plug-and-play device
AUTOCAL
- Handheld device that runs pre-loaded tunes from a tuner
- Customer purchases the device, sends their VIN to a tuner who uploads their tune
- Great for: daily drivers who want a professional tune without learning calibration software
- Plug in, load tune, drive — simple and effective
WHAT TO TUNE ON DURAMAX
- Fuel economy mode for highway driving
- Towing tune for heavy trailer work (more torque, better shift strategy)
- Performance tune for max power
- Disable DPF/DEF warnings on deleted trucks (where legal)
- Adjust idle RPM and cold-start behavior
COLD AIR INTAKE — DOES IT HELP?
- Yes, especially on LBZ and LMM trucks
- More air = lower EGTs under load = more headroom for the tune to add fuel safely
- A K&N or similar intake is a good companion mod to any tune