Power gains of up to 100hp and 120tq to the wheels on a stock Nissan Z

The JB4 performance tuner for the new 2023+ Nissan Z is plug and play and attaches to two easy-to-access sensors in the engine bay and works with your factory DME tuning to remap your boost, timing, and fueling for optimal performance and reduced turbo lag. The JB4 manipulates the ECU boost control signals allowing it to modify boost levels but does not manipulate the ECU manifold boost reference, allowing your ECU to properly map timing and fueling for the higher boost levels. The end result is something that runs as smoothly as stock only with higher boost targets under heavy throttle. JB4 features a 64mhz processor allowing sensors to be sampled 1000 times per second using dedicated 10 bit digital to analog converters, ensuring smooth and powerful performance.

The JB4 adds OBDII CANbus for increased performance mapping, a variety of useful features such as data logging, boost by gear, optional fuel control wires for AFR adjustment, and on-the-fly map changes. JB4 is simply the most capable tuning system available for the Nissan Z.

The higher the octane the higher you can safely raise the boost pressure over stock and the larger the power gain.

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.

Features

Performance & Tuning

• Gains of up to +100hp / +120tq at the wheels on a stock Nissan Z

• Reduces turbo lag and significantly improves throttle response

• 8 preloaded tuning maps for different fuels and modification levels

• 91 octane fuel or better required for optimal gains

• Ethanol (E85) compatible maps included

• Boost by gear control for enhanced traction in 1st–3rd gear

• Exhaust valve/flap control (where supported)

• On-the-fly map switching through JB4 Mobile app or laptop

Hardware & Integration

• Plug & play—connects to 2 sensors in the engine bay

• Integrated OBDII CANbus for advanced tuning, fault reading, and more

• 64MHz processor samples sensor data 1000 times per second

• 10-bit digital-to-analog converters ensure smooth signal adjustments

• Durable billet aluminum enclosure protects the system from heat and vibration

Monitoring & Control

• Compatible with JB4 Mobile app (iOS & Android – app sold separately)

• Optional Bluetooth 4.0 connection via JB4 Mobile Connect Kit

• Optional Windows PC connection via BMS Data Cable

• Live data logging and analysis of up to 40 engine parameters

• Read and clear fault codes directly from your device

• AFR (Air-Fuel Ratio) tuning support with optional fuel control wires

• Firmware updates regularly released for new features, maps, and performance

Additional Benefits

• Not VIN-locked—can be removed and resold or moved to another vehicle

• Runs smooth as stock under normal driving conditions

• Compatible with all driving modes

• Fuel economy unaffected during light throttle cruising

• Free firmware & map updates

• Made in the USA

• 5-Year warranty

• Free shipping (within the USA)

Fitment

• 2023+ Nissan Z 3.0L Twin-Turbo (including Nismo variant)

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.