BMS JB4, engine tuning device BMW S58 2021+ BMW M3 / M4 and G87 M2

BMS JB4 Tuning Controller – BMW G8x M2 / M3 / M4 (S58 Engine) – BLUETOOTH KIT INCLUDED

The BMS JB4 is the most advanced plug-and-play tuning system available for the BMW S58 platform, offering unmatched performance gains, data logging, safety features, and full Bluetooth app integration. Designed as an intelligent inline tuning controller, the JB4 works alongside the factory ECU, adjusting boost, fueling, and performance parameters in real time without modifying the vehicle’s original software.

With its built-in safety functions, map configurations, autotuning capabilities, and flex-fuel compatibility, the JB4 provides an exceptionally refined and reliable tuning solution for street or track use. It is fully reversible and leaves no flash counter, making it ideal for customers who prefer non-invasive tuning.

This S58-specific JB4 includes the latest hardware revision and supports both G8x M3/M4 and G87 M2. Optional fuel wires, flex fuel kits, and other add-ons are supported for advanced custom setups.

Features & Benefits

• Up to ~100hp gains depending on fuel and modifications
• Plug-and-play installation with no ECU flashing required
• Advanced CANbus integration for smooth, safe power delivery
• Multiple preset maps including E-blend and WMI support
• Full Bluetooth app support (JB4 Mobile App)
• Custom map tuning and data logging capability
• Built-in safety systems: boost safeties, fuel trim monitoring, lean protection
• Flex-fuel compatible (E30–E85 setups with add-on sensors)
• Completely removable with no trace for dealer visits

Vehicle Fitment

BMW M2
G87 M2 (S58 engine)

BMW M3
G80 M3 & G80 M3 Competition (S58)
G81 M3 Touring (S58)

BMW M4
G82 / G83 M4 & M4 Competition (S58)

Included in the Package

• JB4 S58 control unit
• Plug-and-play wiring harness
• Integrated Bluetooth Connect Kit
• Installation accessories

For additional maps, firmware updates, and setup guides, visit Burger Motorsports .