Burger Motorsports JB4 Tuner – BMW X3M (F97) / X4M (F98) S58

OVERVIEW

Around 80whp and 100wtq on pump gas, and up to 150whp and 175wtq on higher octane or E85 — without flashing the ECU. The JB4 works through the S58's sensor network and CANbus, so it runs on locked DMEs and survives BMW's over-the-air updates. Installation is plug-and-play with no wire splicing, and fully reversible.

Both the standard JB4 and the JB4PRO include the JB4PRO Bluetooth adapter and the free app, so wireless map switching, live gauges, datalogging and firmware updates from your phone are standard either way. The JB4PRO is a different board built for heavily modified cars. Stock or bolt-ons, the standard JB4 is the right call; building toward E85, port injection or methanol, go PRO.

SPECS

• Gains of around 80whp and 100wtq on pump gas, and up to 150whp/175wtq on higher octane or E85 mixtures
• Piggyback tuner — works through the S58 sensor network and CANbus, with no ECU flash
• Runs on locked DMEs and survives BMW over-the-air software updates
• Multiple switchable maps, including E85 ethanol blends
• Boost-by-gear limiting for traction in the low gears
• Live gauges, datalogging, and fault code reading and clearing over CANbus
• Plug-and-play install with no wire splicing, fully reversible
• Not VIN-locked — transfers between cars
• JB4PRO board adds direct ethanol sensor control
• JB4PRO board adds port injection / CPI / WMI control via the PnP add-on harness
• JB4PRO board adds built-in fuel pressure control for advanced tuning on ethanol mixtures
• JB4PRO board adds onboard datalogging memory
• JB4PRO board adds additional high-current outputs for extra pumps, relays and solenoids
• JB4PRO board adds additional inputs for monitoring external sensors
• JB4PRO board carries Bluetooth and memory on the board itself rather than via the adapter
• JB4PRO board adds CANbus integration with flash tuning
• Free firmware updates
• 5-year warranty
• Designed and assembled in the USA

PARTS INCLUDED

• JB4 tuner in a billet aluminum enclosure
• Plug-and-play installation harness (no wire splicing)
• JB4PRO Bluetooth adapter
• Free JB4PRO smartphone app (iOS and Android)

TECH RESOURCES

Additional Parts Required

• 91 octane minimum for the pump gas maps; higher octane or an E85 blend to reach the quoted 150whp/175wtq figures.
• A compatible smartphone running the free JB4PRO app for map switching, live gauges, datalogging and firmware updates. The Bluetooth adapter is included with both the JB4 and the JB4PRO.
• On a standard JB4 running ethanol, add the JB4 Fuel Pressure Upgrade Kit for direct fuel pressure and fuel trim control. Skip it if you are buying the JB4PRO — that is already built in.
• Port injection, CPI or WMI control on the JB4PRO requires the PnP add-on harness, sold separately.

Installation

• Burger Motorsports 2020+ X3M / X4M and G8x M3 / M4 S58 JB4 Install Guide (PDF)

Notes

• Burger Motorsports does not publish an official part number for this tuner, so no part number is listed. Driving a G80 M3, G82/G83 M4 or G87 M2? Use the S58 JB4 for those chassis instead. If you would rather flash the ECU, we also carry the MHD Super License and the bootmod3 tune for the S58.

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