The 6.2L EcoTec3 in the 2014–2018 K2XX Silverado/Sierra is one of the best LS-family engines ever put in a truck. A proper tune unlocks significant gains. Here’s what to expect.
Stock 6.2L EcoTec3 Output:
- 420 HP / 460 ft-lbs torque (stock tune, 91 octane)
- The engine is capable of significantly more with tuning
What a Tune Changes:
- Ignition timing advance
- Fuel injection timing and volume
- Transmission shift points (if 8-speed)
- AFM/DFM disable
- Speed limiter removal
- Rev limiter adjustment
Expected Gains with a Quality Tune:
- 91 octane tune: +30–50 HP / +40–60 ft-lbs
- 93 octane tune: +40–60 HP / +50–70 ft-lbs
- With supporting mods (intake + tune): +60–80 HP
Tuning Options:
DiabloSport inTune i3 (Handheld Tuner):
One of the most popular tuners for K2XX trucks. Plug-in to OBD2 port, select from pre-loaded tunes, or work with a custom tuner.
HPTuners VCM Suite:
The professional-level solution. Requires a tuner familiar with the Gen V EcoTec3 platform. Best results but requires expert calibration.
Bama Performance Custom Tunes:
Offered with Bama/AmericanMuscle for the truck platform. Good pre-built tunes for common modification levels.
HPT MPVI4 Interface (HP Tuners) – The professional tuning interface for K2XX trucks. Used by performance shops worldwide.
Important: Tune After Any Performance Mods
A tune is the most important mod you can do to maximize any performance upgrade. Always tune after adding an intake, exhaust, or cam.
What tune are you running on your K2XX 6.2? Share your dyno numbers!