MINI B38/B46/B48 JB4 Tuner

Ready to take your MINI B38/B46/B48 turbo to the next level? The JB4 is the most advanced and highly featured tuning system available for your B38/B46/B48 MINI. Power gains are up to 40hp to the wheels (55hp crank) for a B48.

Gains with bolt-on parts, higher octane, E85 mixtures, and larger turbos are even higher. The JB4 features a simple plug and play installation harness for easy installation and includes many features not found on any other tune.

Including on the fly in dash map switching between factory and various performance maps, optional in dash gauge displays for boost, boost limiting by gear for improved traction in lower gears, E85 fuel support, progressive water/methanol support, built-in data logging, built-in code reading, and much more. No ECU flash needed and compatible with locked ECUs Remember the JB4 does not require any additional modifications or previous stages.

Simply install the JB4 as your first and only modification and enjoy an entirely new fast and smooth racing experience. The JB4 also does not require any user setup or customization, but for more advanced enthusiasts, the BMS DATA cable allows you to connect via a laptop for data logging and free software updates.

Made in the USA. 5 year warranty.The latest B38/B46/B48 map guide, feature set, firmware updates, and directions are posted here. Wirelessly Connect to your JB4: Grab our all-new JB4 PRO smartphone connection to wirelessly connect the JB4 tuner to your Bluetooth 4.0 compatible iOS or Android device.

This option allows you to record and analyze vehicle and tuning data, change JB4 performance maps, and update JB4 firmware as we release free newer versions with updates, more powerful maps, and new features under development. Our new adapter fits fully inside the JB4 enclosure for enhanced weather protection and a more streamlined look.

The JB4PRO Free app features an intuitive easy-to-use interface, help buttons, and advanced log analysis tools that can estimate the performance of your car and help identify any tuning concerns.

Vehicle Fitment

• MINI B38/B46/B48
• 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
• 2017-2023 F60 MINI Countryman S including ALL4
• 2018-2023 F60 MINI Countryman JCW ALL4
• 2016-2023 F54 MINI Clubman S
• 2017-2023 F54 MINI Clubman S ALL4
• 2017-2023 F54 MINI Clubman JCW ALL4 If you don't see your B38/B46/B48 powered MINI or year listed here, please email us