Power gains of up to 100hp and 100tq to the wheels on a stock vehicle

The JB4 is a plug-and-play Hyundai / Genesis performance tuner that connects to easy-to-access sensors in the engine bay and works with your factory ECU to optimize boost, timing, and fueling for stronger performance and reduced turbo lag.

Unlike basic tuning boxes, the JB4 includes a fully programmable CANbus system, upgradable firmware, and data logging. CANbus integration allows the JB4 to factor in pedal input, throttle position, gear, RPM, AFR, fuel trims, ignition advance, knock feedback, and more when controlling performance. It can also read and delete fault codes and includes safety strategies such as keeping boost lower until oil and coolant temperatures are up, and switching to a low-boost map if overheating, lean conditions, excessive knock, or overboost are detected.

The JB4 offers significantly more performance, functionality, and safety than an average performance chip. The default Map 1 runs about 4psi over stock peak, and maps (including stock and valet) can be selected on the fly using a BMS diagnostics cable or JB4 mobile adapter. Installation is discreet and fully removable with no trace when needed. Includes maps for 91 octane, 93 octane, and E85 (ethanol) mixtures. Fuel economy during normal driving is typically unchanged. Compatible with all driving modes.

Wirelessly connect to your JB4: Add the JB4PRO smartphone connection to wirelessly connect the JB4 tuner to your Bluetooth-compatible iOS or Android device. Record and analyze vehicle and tuning data, change JB4 performance maps, and update firmware as we release free updates with new features and refined mapping. The adapter fits inside the JB4 enclosure for improved weather protection and a cleaner installation. The free JB4PRO app includes an easy interface, help buttons, and advanced log analysis tools to estimate performance and help identify tuning concerns. For more info on how to use the JB4PRO free app, click here.

Key Features

• Power gains of up to 100hp and 100tq on a stock vehicle
• Improves 0-60 times and 1/4 mile times
• Preloaded with custom JB4 Kia/Hyundai/Genesis tuning software and up to 8 maps for various fuel types and modification levels
• Ethanol (E85) compatible tuning maps
• Ability to read and delete fault codes
• View and record up to 40 gauges and engine parameters in real-time with the JB4 app
• Boost by gear control in 1st, 2nd, and 3rd gears for optimal launches, adjustable via the JB4 app
• Control exhaust flap operation in most JB4 applications
• Compatible with JB4 Mobile for smartphone-based logging, tuning changes, and adjustments
• Delivers superior performance, functionality, and safety over standard performance chips
• Quick and easy Plug & Play installation
• CANbus OBDII integration for advanced tuning features and enhanced performance
• Improved performance over non-integrated chip tunes
• Runs as smoothly as stock for a factory-like driving experience
• Compatible with all driving modes
• Fuel economy remains unchanged during normal driving
• Requires 91 octane fuel or higher for optimal performance gains
• Not VIN-locked; can be removed without a trace and resold
• Includes a rugged JB4 billet aluminum enclosure for protection
• Designed and assembled in the USA
• Free USA shipping
• Backed by a 5-year warranty
  

Fitment

Hyundai
• 2021+ Hyundai Staria 3.5L SmartStream Turbo V6

Genesis
• 2022+ Genesis GV70 3.5L SmartStream Turbo V6
• 2021+ Genesis GV80 3.5L SmartStream Turbo V6
• 2025+ Genesis GV80 Coupe 3.5L SmartStream Turbo V6
• 2021+ Genesis G80 3.5L SmartStream Turbo V6
• 2022+ Genesis G90 3.5L SmartStream Turbo V6

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What is a JB4?
The JB4 is a plug-and-play tune for turbocharged vehicles. It installs between your car’s sensors and ECU and improves performance by controlling boost and related parameters through these connections. The JB4 stands out with advanced connection points and processing, including CANbus, fuel and spark control, Bluetooth app support, and safety systems. BMS publishes free mapping and firmware updates as ongoing development allows. The JB4 is not VIN locked and can be removed, transferred, or resold later.

Is the JB4 a real tune?
Yes. By tapping into specific sensors and CANbus for real-time data, the JB4 can alter boost, timing, AFR, and fuel trims similar to an ECU reflash, while retaining factory safety systems and without unlocking or flagging the ECU.

Document & Video

Install Guide