Description
Unlock the true performance potential of your 2019+ GMC Sierra 1500 2.7L Turbo with the JB4 Performance Tuner, a cutting-edge plug-and-play solution engineered to deliver substantial horsepower and torque gains without modifying your factory ECU. Designed for seamless integration, the JB4 enhances boost, ignition timing, and fueling to provide stronger acceleration, improved throttle response, and reduced turbo lag.
Installation is quick and discreet, connecting directly to two easily accessible sensors in the engine bay. Unlike traditional ECU flash tuning, the JB4 leaves no trace when removed, ensuring your vehicle remains undetectable to factory systems. This makes it an ideal solution for enthusiasts seeking increased performance without permanent modifications.
Advanced CANbus Integration for Real-Time Precision
The JB4 stands apart from basic tuning systems with its full CANbus integration, allowing it to read and process critical engine data directly from the ECU. This includes throttle position, pedal input, ignition timing, air/fuel ratios, fuel trims, engine knock, gear selection, and more. By utilizing this real-time data, the JB4 delivers adaptive, precision tuning that maximizes performance while maintaining engine safety and reliability.
Performance Without Compromise
Delivering gains of up to 85 wheel horsepower and 120 lb-ft of torque on a stock truck, the JB4 significantly improves 0-60 times, towing capability, and overall drivability. Despite these performance enhancements, fuel economy during normal driving remains unchanged, and full compatibility with factory driving modes—including towing—is retained.
Wireless JB4PRO Connectivity Included
Included with the system is the JB4PRO Bluetooth adapter and free mobile app, enabling wireless control via iOS and Android devices. This advanced interface allows you to:
- Switch between multiple performance maps for different fuels and driving conditions
- Monitor and log up to 40 engine parameters in real time
- Read and clear diagnostic fault codes
- Perform firmware updates with ongoing performance improvements and new features
The integrated adapter design ensures enhanced durability, weather protection, and a clean, factory-style installation.
Key Features & Benefits:
- Gains of up to 85 WHP and 120 WTQ on a stock vehicle
- Improved 0-60 acceleration and quarter-mile performance
- Multiple tuning maps (91 octane, 93 octane, E85, race fuel, stock, valet)
- Quick plug-and-play installation with no ECU flashing required
- Supports E85 ethanol blends
- Reads and clears fault codes
- Logs up to 40 engine parameters in real time
- Boost-by-gear control for improved traction and launches
- Compatible with the JB4PRO smartphone app
- Full CANbus integration for real-time adaptive tuning
- Smooth, factory-like drivability
- No impact on fuel economy during normal driving
- Requires 91 octane or higher for optimal performance
- Fully removable and not VIN-locked
- Durable billet aluminum enclosure
- Designed and assembled in the USA
- 5-year warranty
Vehicle Fitment
GMC Models:
- 2019+ GMC Sierra 1500 2.7L Turbo
Why Choose JB4?
The JB4 is a true plug-and-play performance tuner that delivers ECU-level tuning without the risks of ECU flashing. By integrating with your vehicle’s sensors and CANbus system, it safely adjusts boost, timing, air/fuel ratios, and fuel trims in real time—providing significant performance gains while retaining all factory safety systems.
With continuous free firmware updates, advanced tuning capabilities, and a proven track record, the JB4 remains the industry benchmark for turbocharged performance tuning.
