Description
Unlock the full potential of your MINI B38, B46, or B48 turbo engine with the JB4 Performance Tuner. Designed for plug & play installation, the JB4 delivers up to 40 horsepower (55hp crank) to the wheels on a stock MINI, with even higher gains possible when combined with bolt-on modifications, higher octane fuel, E85 blends, or larger turbos.
The JB4 is the most advanced tuning system available for MINI B38/B46/B48 engines, featuring:
- On-the-fly in-dash map switching between factory and performance maps
- Optional in-dash boost gauge display
- Boost limiting by gear for improved traction
- E85 fuel support
- Progressive water/methanol integration
- Built-in data logging and fault code reading
JB4PRO Wireless Connectivity
The JB4PRO adapter and free app are included, allowing wireless connection to your iOS or Android device via Bluetooth 4.0. Through the app, you can:
- Record and analyze vehicle data
- Change performance maps
- Update JB4 firmware with free releases from BMS
The adapter fits fully inside the JB4 enclosure for improved weather protection and a clean look, while the app offers an intuitive interface, advanced log analysis tools, and tuning insights.
Key Features & Benefits
- Power gains up to 40hp to the wheels
- Improves 0-60 mph and quarter-mile times
- Multiple tuning maps for various fuel types
- Quick, plug & play installation
- Supports E85 ethanol blends
- Reads and deletes fault codes
- Logs up to 40 engine parameters
- Boost-by-gear control for improved traction
- Controls exhaust flap operation on supported models
- Fully compatible with the JB4PRO app
- Full CANbus integration
- Smooth performance, compatible with all driving modes
- No impact on normal fuel economy
- Requires 91 octane or better for maximum gains
- Not VIN locked; fully removable and transferable
- Includes billet aluminum enclosure
- Designed and assembled in the USA
- Backed by a 5-year warranty
Vehicle Fitment
MINI B38/B46/B48 Engines
- 2014–2023 F57 MINI Cooper S
- 2015–2023 F57 MINI Cooper JCW GP
- 2014–2023 F55/F56 MINI Cooper S
- 2015–2023 F55/F56 MINI Cooper JCW
- 2018–2023 F55/F56 MINI Cooper One
MINI Countryman (F60)
- 2017–2023 S ALL4
- 2018–2023 JCW ALL4
MINI Clubman (F54)
- 2016–2023 S
- 2017–2023 S ALL4
- 2017–2023 JCW ALL4
If your MINI isn’t listed, contact us to confirm JB4 compatibility.
What is a JB4?
The JB4 is a plug & play performance tuner for turbocharged vehicles. It connects between your vehicle’s sensors and DME/ECU, manipulating boost, timing, and fueling for safe, smooth, and significant performance gains. With advanced CANbus integration, fuel & spark control, and Bluetooth connectivity, the JB4 delivers capabilities beyond standard tuning devices. It’s fully removable, not VIN-locked, and continually supported by free BMS firmware updates, making it the gold standard in MINI turbo tuning worldwide.
Is the JB4 a Real Tune?
Yes. The JB4 adjusts boost, timing, air/fuel ratio, and fuel trims in real-time using CANbus and sensor data, achieving similar effects to an ECU reflash without your MINI ever knowing it’s tuned. The result is enhanced power, torque, and drivability while retaining all factory safety features.
