Description
Unlock the full potential of your Toyota GR Supra Mk5 with the JB4 Performance Tuner, delivering up to 100 horsepower to the wheels on a completely stock vehicle. Designed for the B58 3.0L inline-6 and B48 2.0L turbo 4-cylinder engines, the JB4 provides factory-smooth power gains, improved turbo response, and enhanced acceleration without the risks of ECU flashing.
Plug-and-Play Installation & Advanced Tuning Features
The JB4 installs easily with a plug-and-play harness, allowing fast installation and removal. Unlike traditional flash tunes, the JB4 requires no staged upgrades or supporting modifications. Key features include:
- Real-time boost, timing, and fueling adjustments
- Map switching between stock and performance modes
- Optional boost gauge display
- Boost-by-gear control for optimized traction
- Progressive water/methanol injection support
- Built-in data logging and fault code reading/clearing
- Optional electronic wastegate and exhaust flapper control
- Multiple fuel maps including pump gas and E85 compatibility
Wireless JB4PRO Smartphone Connectivity
The included JB4PRO Bluetooth adapter connects to iOS or Android devices, offering:
- On-the-fly performance map selection
- Real-time data logging and engine performance analysis
- Firmware updates unlocking new maps and features
- Advanced diagnostic and performance estimation tools
The adapter fits entirely inside the JB4 billet aluminum enclosure for enhanced weather protection and a streamlined appearance.
Key Features & Benefits
- Up to 100 wheel horsepower on stock Supra
- Improves 0-60 times and quarter-mile performance
- Multiple tuning maps for different fuel types
- Quick plug-and-play installation, fully removable
- Reads and clears fault codes
- Monitors up to 40 engine parameters in real time
- Boost-by-gear control for improved traction
- Exhaust flap control on supported vehicles
- Full CANbus integration for advanced tuning and safety
- Smooth, stock-like drivability
- Compatible with all driving modes
- No impact on fuel economy under normal driving
- Requires 91 octane or higher for performance gains
- Not VIN locked, transferable between vehicles
- Rugged billet aluminum enclosure
- Designed and assembled in the USA
- 5-year warranty
Vehicle Fitment
- 2020-2026 Toyota GR Supra Mk5 B58 3.0L inline-6
- 2020-2026 Toyota GR Supra Mk5 B48 2.0L turbo 4-cylinder
Why Choose JB4?
The JB4 is a real, plug-and-play performance tuner that actively adjusts boost, timing, and fueling using CANbus engine data. This delivers ECU-level performance gains without permanently modifying your ECU. With continuous firmware updates, smartphone connectivity, and full ethanol compatibility, the JB4 is the gold standard in turbocharged vehicle tuning worldwide.
