Description
Unlock hidden performance in your Volkswagen 1.4T TSI Jetta or Golf with the JB4 Performance Tuner, a plug-and-play solution that delivers more horsepower, torque, and turbo responsiveness without flashing your ECU. Designed for ease of use and maximum performance, the JB4 provides advanced tuning capabilities while retaining factory safety systems.
Plug-and-Play Installation
The JB4 installs easily by connecting to sensors in the engine bay. It works with your factory ECU to safely remap boost, timing, and fueling for optimal performance and reduced turbo lag. With full CANbus integration, it monitors real-time engine data, providing unique safety features such as low boost until oil and water reach proper temperatures and automatic boost reduction if the engine runs lean, overheats, or experiences knock.
Wireless JB4PRO Smartphone Connectivity
Included with your JB4 tuner is the optional JB4PRO Bluetooth adapter, allowing wireless connection to iOS and Android devices. Through the free JB4PRO app, you can:
- Switch between performance maps on the fly
- Record and analyze real-time engine data
- Update firmware with free upgrades and new maps
- Access advanced log analysis tools to identify tuning concerns
The adapter fits fully inside the JB4 enclosure, providing enhanced weather protection and a clean, integrated look.
JB4 Features & Benefits
- Increases horsepower and torque for faster acceleration
- Improves 0-60 mph and quarter-mile times
- Multiple tuning maps for different fuel types, including E85
- Quick plug-and-play installation
- Reads and deletes fault codes
- Monitors and logs up to 40 engine parameters
- Boost-by-gear control for better traction
- Exhaust flap control on supported vehicles
- Full CANbus integration for advanced tuning
- Smooth, stock-like drivability across all driving modes
- No impact on fuel economy during normal driving
- Requires 91 octane fuel or higher for performance gains
- Not VIN locked and fully removable
- Includes billet aluminum enclosure
- Designed and assembled in the USA
- 5-year warranty
Vehicle Fitment
Volkswagen:
- 2018-2021 VW Jetta 1.4T TSI
- 2019-2022 VW Golf 1.4T TSI
What is a JB4?
The JB4 is a plug-and-play tuner for turbocharged vehicles. It connects between your car’s sensors and ECU, safely adjusting boost, timing, and fuel trims to deliver substantial horsepower and torque gains. With advanced CANbus integration, smartphone connectivity, and ongoing free firmware updates, the JB4 provides performance upgrades without permanent ECU modification.
Is the JB4 a real tune?
Yes. The JB4 manipulates real-time engine data to optimize boost, ignition timing, and air-fuel ratios. This delivers safe, smooth, and significant performance gains, comparable to ECU flash tuning, without ever flagging or unlocking your ECU.
