Unlock serious performance from your Toyota GR Supra Mk5 with the JB4 plug and play tuner. This advanced piggyback tuning box delivers gains of up to around 80 wheel horsepower on a completely stock car running pump fuel (approximately 100 hp at the crank), without flashing the ECU. Fully compatible with locked ECUs, the JB4 is the smart remap alternative for A90 and A91 Supra owners. Now supplied with the JB4 PRO Bluetooth smartphone connection and free app for simple map switching, data logging and firmware updates.
- Plug and play installation with model specific harness, removable without a trace and not VIN locked
- Multiple preloaded maps for stock, higher octane and ethanol blends up to E30, plus a stock bypass map
- Built in data logging, fault code read and clear, boost by gear control, optional boost gauge display and exhaust flap control
- CANbus integration for responsive, safe control of boost, timing and fuelling while retaining factory safety systems
- Runs smoothly in all driving modes with fuel economy unchanged during normal driving; 91 octane or better recommended for performance gains
- Rugged billet aluminium enclosure, designed and assembled in the USA with a 5 year warranty
With the included JB4 PRO Bluetooth, connect your iOS or Android device to view up to 40 live parameters, switch maps, analyse logs and apply free firmware updates as new features are released. In dash command integration is not currently available, so the app is used for configuration. For those running ethanol blends, an optional fuel pressure connection enables direct fuel pressure and trim control for even finer tuning.
Vehicle fitment
- 2020 to 2026 Toyota GR Supra Mk5 B58 3.0 litre inline 6
- 2020 to 2026 Toyota GR Supra Mk5 B48 2.0 litre turbo 4 cylinder
The JB4 sits between engine sensors and the factory ECU to optimise performance using real time CANbus data. It improves acceleration, turbo response and overall drivability while maintaining OEM safety protocols. It is a popular choice with Nforcd customers looking for a Supra tuning upgrade that avoids an ECU flash and supports future hardware like intakes, exhausts and upgraded turbos.
Ready to transform your Supra Mk5 with a proven tuning module? Order your JB4 from Nforcd today. Professional fitting is available at Nforcd in Warwickshire; request a quote via Sales@nforcd.com.