Jeep Grand Cherokee SRT 6.4L (392 HEMI) MoPower Custom Tune with Livernois MyCal Handheld

The Jeep Grand Cherokee SRT 6.4L 392 HEMI combines luxury and muscle in a world-class SUV — and MoPower Calibrations makes it even better with a custom performance ECU tune. Paired with the Livernois MyCal handheld programmer, this package unlocks dyno-proven horsepower and torque gains, sharper throttle response, and improved drivability without sacrificing factory reliability.

Dyno-Proven Power Gains

On the dyno and the road, our calibration engineers optimized spark, fuel curves, airflow, and torque management to safely maximize the potential of the naturally aspirated 6.4L HEMI. The result is a Grand Cherokee that accelerates harder, responds instantly to throttle input, and delivers reliable power whether you’re cruising the highway or pushing performance limits.

MoPower Jeep Grand Cherokee 6.4L Tune Features

• Dyno-verified horsepower & torque increases
• Sharper throttle response and improved acceleration
• Stronger low-end torque for street & spirited driving
• Optimized spark and fueling curves
• Modified torque management algorithms
• Refined knock thresholds for safe, consistent performance
• Supports bolt-ons such as intake and exhaust

Plug-and-Play with Livernois MyCal

The included Livernois MyCal handheld programmer makes tuning your Jeep Grand Cherokee SRT simple. Flash the ECU directly through the OBDII port — no downtime, no mailing in your ECU. Switch between stock and performance tunes at any time with ease.

Fuel Options

This calibration is designed for premium fuels and supports:

• 91 Octane
• 92 Octane
• 93 Octane

⚠️ Running lower octane fuel than your tune requires may result in engine damage. MoPower assumes no liability for incorrect fuel usage.

Important Disclaimer

MoPower Calibrations are sold for off-road use only. All performance Calibrations and Engine Control Units installed are at the customer’s own risk. MoPower Calibrations or www.mo-power.com holds no responsibility either implied or otherwise for mechanical, electrical, or other failure when using any aftermarket performance products from MoPower Calibrations. Items sold for off-road use only are illegal in many states and provinces and are intended for racing vehicles which may never be used on a public road or highway. Not for sale or use in the State of California.

MoPower Calibrations LLC is not affiliated, associated, authorized, endorsed by, or in any way connected with Diablosport, HPTuners, or SCT (Derive) or any of their subsidiaries or affiliates. The names Diablosport, HPTuners, and SCT, as well as related names, marks, emblems, and images, are registered trademarks of their respective owners.

The MoPower Difference

Take your Jeep Grand Cherokee SRT 6.4L (392 HEMI) to the next level with a MoPower Custom Tune and the Livernois MyCal handheld. Enjoy sharper throttle, stronger torque, and dyno-proven horsepower gains that make your Jeep even more capable and exciting to drive.