Unlock serious performance from your 2025+ Land Rover Defender OCTA 4.4L V8 twin turbo with the JB4 plug and play tuner. This BETA-support JB4 delivers gains of around 125whp on pump fuel and up to 260whp on higher octane or E85 mixtures, all without an ECU flash. It installs easily, is fully reversible, and works with locked ECUs, making it a powerful and flexible upgrade for your OCTA V8. Supplied in the UK by Nforcd.
- Plug and play tuning module for the 2025+ Land Rover Defender OCTA 4.4L V8 twin turbo
- Approx. 125whp gains on pump fuel and up to 260whp on higher octane or E85, where available
- Preloaded OCTA-specific JB4 software with up to 8 selectable maps to suit fuel and modifications
- Boost by gear control for 1st, 2nd and 3rd to help optimise traction and launches
- Ethanol compatible tuning maps, including E85 support
- Read and clear fault codes plus advanced CANbus-based diagnostics
- Real-time data logging and up to 40 live gauges via the free JB4PRO app when used with the optional JB4 PRO Bluetooth adapter
- User-adjustable 1st and 2nd gear boost limiting via the app
- Electronic wastegate control under development
- CANbus OBDII integration for enhanced performance, safety and smooth OEM-like drivability
- Quick installation with no cutting or splicing of factory wiring and fully removable
- Not VIN-locked, so it can be moved to another vehicle or resold later
- Compatible with all driving modes; fuel economy unchanged during normal driving
- Rugged billet aluminium enclosure
- Made in the USA with a 5 year warranty
- 91 octane fuel or better required for performance gains
Fitment: 2025+ Land Rover Defender OCTA 4.4L V8 Twin Turbo.
Nforcd knows JB4 products well and this OCTA V8 tuner has quickly become a favourite for owners wanting a powerful, reversible upgrade without unlocking the ECU. Order yours today for fast UK delivery. Professional fitting is available at Nforcd in Warwickshire; request a quote via Sales@nforcd.com.