Power gains of up to 80HP on a stock vehicle without the risks of flashing!

Ready to take your F chassis N55 BMW to the next level? How about up to 60hp to the wheels (80hp crank) on a completely stock car or up to 100hp to the wheels (120hp crank) on a fully modified car? The JB4 features a simple plug and play installation harness for easy installation and includes many features not found on any other tune. Including the ability to enable/disable the tuning from the driver's seat, gear dependent boost control to help with traction, autotuning for E85 mixtures, built-in diagnostic code reading/deleting, expanded engine safety systems, free firmware updates, in-dash boost gauge, the ability to control the exhaust flapper using your BC button, and much more.

The JB4 Tuner 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. For more advanced enthusiasts, the BMS DATA or JB4 Mobile cable allows you to connect a laptop or smartphone for additional gauges, data logging, and free firmware updates as we add new features and maps.

The JB4 is a full plug and play device that installs and removes in minutes at home without special tools and unlike flash maps that permanently write over your DME with the JB4, your DME is never aware it's running more than the factory power levels. And when you're ready to change things up the JB4 is not VIN locked and can be moved to your next vehicle or resold. Made in the USA. 5 Year Warranty.

Note for electronic wastegate models, the EWG add-on connector remains optional and can be purchased separately from our upgrades for higher HP applications where direct EWG control is beneficial, such as those using an integrated WMI kit or larger turbo.

NOTE: Some F10 and X chassis models require a JB4PRO bluetooth adapter to select options bit#1 in the FREE JB4PRO app to enable the in-dash controls for those models.

Click here for the latest JB4 firmware, map guide, and details

• Optional: For Extra Ordinary Performance with JB4 We also recommend Our N55 Downpipe

Features

• Significant Power Gains: Achieve up to 60 horsepower and 60 lb-ft of torque at the wheels (80 hp crank) on a completely stock setup. For modified vehicles, gains can reach up to 100 horsepower at the wheels (120 hp crank).
• Flexible Boost Control: Control boost by gear to maximize traction and optimize launches. Gear-dependent boost settings can be managed through the JB4 app for precise adjustments.
• E85 Ethanol Compatibility: Built-in autotuning features support varying mixtures of E85, offering flexibility for drivers looking to maximize performance using ethanol-based fuels.
• Diagnostic and Safety Tools: The JB4 allows users to read and delete diagnostic fault codes and incorporates expanded engine safety systems for added reliability.

User Control & Convenience

• Quick Plug-and-Play Installation: No complex modifications or prior stages are needed. The JB4 installs and can be removed easily without specialized tools, leaving no trace of its installation.
• In-Dash Control Capabilities: The JB4 can be toggled on and off directly from the driver’s seat. For newer models with electronic wastegate (EWG), control options can be expanded for high-performance applications.
• CANbus OBDII Integration: This integration provides real-time data monitoring, greater tuning precision, and enhanced safety protocols.
• Mobile Connectivity: Easily manage JB4 settings, record data, switch maps, and receive firmware updates through your smartphone (via JB4 Mobile) or a Windows laptop using the BMS data cable.

Improved Functionality and Safety

• Exhaust Control and Boost Monitoring: Integrated exhaust flap controls for certain applications and extensive real-time monitoring of up to 40 engine parameters ensure smooth, safe, and high-performance operation.
• Firmware Updates and Adaptability: The JB4 is continually supported with free firmware updates, adding features, enhancing maps, and optimizing performance.
• No VIN Locking: Users can remove, resell, or transfer the JB4 to another compatible vehicle without restrictions.

Fuel and Compatibility:

• 91 Octane Requirement: To achieve advertised performance gains, 91 octane or higher fuel is required.
• Retained Fuel Economy: During normal driving conditions, fuel economy remains unaffected by the JB4 installation.

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. For more info on how to use the JB4PRO free app click here.

Fitment

BMW 1 Series

• 2012-2013 N55 BMW F20/F21 M135 (JB4_PWG)
• 2014-2015 N55 BMW F20/F21 M135 (JB4_EWG)

BMW 2 Series

• 2014-2015 N55 BMW F22/F23 M235i (JB4_EWG)
• 2016-2017 N55 BMW F87 M2 (JB4_EWG)

BMW 3 Series

• 2012-2013 N55 BMW F30/F31 335i including xDrive, Active Hybrid, xDrive GT (JB4_PWG)
• 2014-2015 N55 BMW F30/F31 335i including xDrive, Active Hybrid, xDrive GT (JB4_EWG)

BMW 4 Series

• 2014-2016 F32/F33/F36 BMW 435i including xDrive and Gran Coupe (JB4_EWG)

BMW 5 Series

• 2011 N55 BMW F10/F11/F07 535i including xDrive, ActiveHybrid 5, xDrive GT (JB4_F10_A)
• 2012-2013 N55 BMW F10/F11/F07 535i/ix, ActiveHybrid 5, and 535i/ix GT (Either JB4_F10_A or JB4_PWG, check sensor using reference photo)
• 2014-2016 N55 BMW F10/F11/F07 535i/ix, ActiveHybrid 5, and 535i/ix GT (JB4_EWG)

BMW 6 Series

• 2011 N55 BMW F06/F12/F13 640i including xDrive and Gran Coupe (JB4_F10_A)
• 2012-2013 N55 BMW F06/F12/F13 640i including xDrive and Gran Coupe (Either JB4_PWG for Type B or JB4_F10_A for Type A, check sensor using reference photo)
• 2014-2016 N55 BMW F06/F12/F13 640i including xDrive and Gran Coupe (JB4_EWG)

BMW 7 Series

• 2013-2018 N55 BMW F01/F02 740i including xDrive (JB4_EWG)

BMW X Series

• 2011-2013 N55 BMW F25 X3 including xDrive (JB4_PWG)
• 2014-2017 N55 BMW F25 X3 including xDrive (JB4_EWG)
• 2014-2018 N55 BMW F15 X5 including xDrive (JB4_EWG)
• 2014-2018 N55 BMW F16 X6 including xDrive (JB4_EWG)
• 2014-2018 N55 BMW X4 M40i including xDrive (JB4_EWG)

- Purchase E Chassis N55 JB4 

Warranty & Support: The JB4 tuner comes with a 5-year warranty and is made in the USA, reflecting its durability and commitment to quality. Users can also benefit from free USA shipping.

Overall, the JB4 is a comprehensive tuning solution, perfect for enhancing performance while maintaining safety, drivability, and convenience for a broad spectrum of F-Chassis N55 BMW vehicles.

Wastegate Identification Chart. Pneumatic (PWG) or Electronic (EWG)?

What is a JB4?

The JB4 is a plug & play tune available for turbocharged vehicles. The JB4 tuner installs between your car's sensors and its DME/ECU (computer) and manipulates vehicle performance through these connections making your vehicle much faster. While it's not the only tuning system that operates this way the JB4 separates itself from the competition with much more advanced connection points and processing including CANbus, fuel & spark control, Bluetooth to your smartphone, and a variety of innovative and advanced features not possible with any other system. BMS regularly publishes free mapping and firmware updates adding performance and features as ongoing development allows. In addition, the JB4 system is not VIN-locked to your vehicle and can quickly be removed and swapped between cars or resold at a later time. Often imitated but never duplicated the JB4 has been the gold standard in plug and play turbocharged performance tuning for over a decade.

Is the JB4 a real tune?

Yes the JB4 is a real tune. By tapping into specific sensors and CANbus for real time vehicle data the JB4 is able to alter your boost, timing, AFR, and/or fuel trims, to a similar degree an ECU reflash would, but without the vehicle ever knowing its been tuned. The result is safe, smooth, and significant power and torque gains while retaining your factory safety systems and without having to unlock/flag your ECU.

 DYNO RESULTS

F32 435i with BMS intake, exhaust

F22 M235i with intake, exhaust

F30 335i with BMS intake, exhaust

VIDEOS

Change maps on the fly

Control your roar! Open and close your exhaust flapper valves. 

INSTALL VIDEOS

JB4 N55 435i EWG install video

 JB4 N55 335i/335iX PWG install video

 JB4 N55 BMW F10 535i/535iX install video