Description
Unleash your Defender OCTA's full potential with the Burger Tuning JB4, the most advanced plug & play performance tuner available for the 2025+ Land Rover Defender OCTA V8 Twin Turbo. Delivering up to 260whp gains on E85 or higher octane fuel and 125whp on pump gas, the JB4 transforms your 4.4L twin-turbo V8 from factory-fast to ferociously quick — all without permanent modifications.
Key Performance Gains
- +125whp on pump fuel
- +260whp on E85/high-octane mixtures
- Improves 0–60mph and 1/4 mile times significantly
- Maintains factory drivability and reliability
Advanced Features & Technology
- CANbus OBDII integration for unparalleled real-time tuning control
- User-customizable boost control by gear for optimized launches in 1st, 2nd, and 3rd
- Smartphone & laptop compatibility via JB4 Mobile or BMS data cable
- 8 performance maps preloaded, including E85 and mod-level options
- Live data monitoring of up to 40 engine parameters
- Ethanol fuel support for high-power applications
- Read and clear fault codes directly from your device
- Fully reversible install with no cutting or splicing of wires
JB4 Mobile Integration
Connect wirelessly to your iOS or Android device via the optional JB4 Mobile Bluetooth Connect Kit or use a Windows laptop with the BMS USB data cable. With the JB4 app (sold separately), you can:
- Switch between maps
- View live engine data
- Record performance logs
- Adjust tuning parameters
- Update JB4 firmware with free future releases
Why Choose the JB4 for Your Defender OCTA?
- Plug & Play Installation — fully reversible with no permanent changes
- Compatible with all factory driving modes
- Fuel economy unaffected during normal driving
- Not VIN-locked — transferable and resale-friendly
- Includes billet aluminum JB4 enclosure for durability and heat protection
- Made in the USA
- 5-Year Manufacturer Warranty
- Free Shipping (USA)
Vehicle Compatibility
-
Land Rover Defender OCTA V8 Twin Turbo (2025+)
- Engine: 4.4L V8 Twin Turbo (S68)
- Platform: OCTA Series
What is the JB4?
The JB4 is a revolutionary plug-and-play tuning system designed for modern turbocharged engines. Installed between your engine sensors and the ECU, it intercepts and optimizes key signals to safely boost horsepower and torque — with advanced fuel and spark control, CANbus integration, mobile app control, and more.
Often imitated but never duplicated, the JB4 has remained the industry standard in turbo tuning for over a decade.
Note:
This version is currently in BETA for the 2025+ Land Rover Defender OCTA V8. Early adopters may receive firmware updates and feature expansions as Burger Motorsports continues active development on the S68 JB4 platform.
