Description
F Chassis N55 BMW JB4 Tuner – Up to 80HP Gains
Elevate your F chassis N55 BMW to a new level of performance with the JB4 Tuner, capable of delivering up to 60hp to the wheels (80hp crank) on a stock vehicle and up to 100hp to the wheels (120hp crank) on fully modified cars. Designed for enthusiasts seeking a safe, reversible, and plug-and-play performance upgrade, the JB4 installs quickly using a simple harness and requires no ECU flash.
Now featuring the JB4PRO adapter and free mobile app, the JB4 allows wireless connection to your iOS or Android device. The app enables data logging, map selection, firmware updates, and advanced performance monitoring. The adapter fits completely inside the JB4 enclosure for enhanced weather protection and a sleek look.
Performance Features & Benefits
- Power gains up to 60hp and 60tq to the wheels on stock vehicles
- Improves 0-60 mph acceleration and quarter-mile performance
- Multiple tuning maps for various fuel types, including E85 ethanol blends
- Quick plug-and-play installation, fully reversible
- Enable or disable tuning from the driver’s seat
- Boost-by-gear control for improved traction
- Autotuning support for E85 fuel
- Read and clear fault codes; log up to 40 engine parameters
- Control exhaust flap operation on supported vehicles
- Full CANbus integration for smoother performance and advanced diagnostics
- Compatible with JB4PRO mobile app for wireless tuning, logging, and updates
- Runs as smoothly as stock in all driving modes
- No impact on fuel economy during normal driving
- Non-VIN locked and fully removable for transfer or resale
- Durable billet aluminum enclosure
- Designed and assembled in the USA
- 5-year warranty
Optional Upgrades
For electronic wastegate (EWG) models, the EWG add-on connector can be purchased for higher horsepower applications, including vehicles equipped with integrated water/methanol injection kits or larger turbos. Some F10 and X chassis models may require the JB4PRO Bluetooth adapter to enable in-dash controls via the app.
Vehicle Fitment
BMW 1 Series (F20/F21)
- 2012-2013 M135i (JB4_PWG)
- 2014-2015 M135i (JB4_EWG)
BMW 2 Series (F22/F23/F87)
- 2014-2015 M235i (JB4_EWG)
- 2016-2017 M2 (JB4_EWG)
BMW 3 Series (F30/F31)
- 2012-2013 335i including xDrive, Active Hybrid, xDrive GT (JB4_PWG)
- 2014-2015 335i including xDrive, Active Hybrid, xDrive GT (JB4_EWG)
BMW 4 Series (F32/F33/F36)
- 2014-2016 435i including xDrive and Gran Coupe (JB4_EWG)
BMW 5 Series (F07/F10/F11)
- 2011-2016 535i/ix including xDrive, ActiveHybrid, and GT (JB4 variants, see reference photo for proper sensor type)
BMW 6 Series (F06/F12/F13)
- 2011-2016 640i including xDrive and Gran Coupe (JB4 variants, see reference photo for proper sensor type)
BMW 7 Series (F01/F02)
- 2013-2018 740i including xDrive (JB4_EWG)
BMW X Series (F25/F15/F16/F26)
- 2011-2013 X3 xDrive (JB4_PWG)
- 2014-2018 X3/X4/X5/X6 xDrive (JB4_EWG)
Why Choose JB4?
The JB4 is a true plug-and-play tuning solution for turbocharged BMWs, manipulating critical sensors and CANbus data to safely optimize boost, spark, and fuel delivery. Unlike ECU flash maps, the JB4 operates undetectably by the DME, keeping all factory safety features intact. Non-VIN locked and fully removable, it can be transferred between vehicles or resold. Trusted globally in 67+ countries for over a decade, the JB4 remains the gold standard for plug-and-play BMW performance tuning.
