JB4 Tuner for 2020-2026 Toyota Supra Mk5

Overview

The JB4 is a plug-and-play tuner for the Toyota Supra Mk5 delivering up to 80whp (100hp crank) on a completely stock B58 running pump gas — no ECU flash required, and compatible with locked ECUs. Gains increase further with bolt-ons, higher octane, or E85 blends.

SPECS

• Preloaded with custom JB4 Supra tuning software and up to 8 maps for different fuel/modification levels
• On-the-fly in-dash map switching between factory and performance maps
• Boost-by-gear control (1st, 2nd, 3rd) for improved launch traction
• Progressive water/methanol support, built-in data logging, and fault code reading
• Optional direct EWG control and exhaust flapper control
• Optional fuel pressure connection for direct fuel pressure/trim control (useful for E85 mixtures)
• Not VIN-locked — removable without a trace and resellable
• Includes billet aluminum enclosure; designed and assembled in the USA
• 5-year warranty

PARTS INCLUDED

• 1x JB4 tuner unit in billet aluminum enclosure
• Plug-and-play installation harness
• Optional fuel pressure sensor (selected variant only)

TECH RESOURCES

• Simple plug-and-play installation harness — no ECU flashing, additional modifications, or prior tuning stages required; install it as your first and only modification
• In-dash map/setting changes for the Supra aren't yet supported, so a JB4 Mobile Bluetooth adapter or BMS data cable is currently required for changing maps, logging, and adjustments
• The JB4 PRO smartphone connection (Bluetooth 4.0, iOS/Android) fits inside the JB4 enclosure and enables wireless map changes, data logging, and firmware updates
• See the official install guide for step-by-step instructions
• 91 octane or better is required to realize the performance gains

Vehicle Application