Description
Power gains of up to 120HP & 120TQ to the wheel on a stock B58 without the risks of flashing!
The JB4 B58 tuner from Burger Motorsports is the most advanced plug & play tuning system available for BMW B58 turbocharged engines. Power gains of up to 120 horsepower and 120 lb-ft torque at the wheels are possible on a completely stock B58 engine running pump gas. Vehicles equipped with bolt-on upgrades, higher octane fuel, E85 mixtures, or larger turbochargers can see even greater gains.
Also available with our new JB4PRO board which includes built in Bluetooth, fuel pressure control for more advanced tuning with ethanol mixtures, built in flex fuel/port injection/WMI control using our PNP add on harness, onboard data-logging memory, and many additional features to be unlocked in the future via free firmware updates. Perfect for those planning higher power builds including larger turbos and/or port injection/WMI.
Both versions include the JB4PRO adapter and free app built in!
No ECU flash required and fully compatible with locked 🔒 ECUs.
The JB4 includes a simple plug & play wiring harness allowing quick installation and removal while delivering advanced tuning capabilities unavailable in other tuning systems. Features include on-the-fly map switching between stock and performance maps, boost-by-gear control for improved traction, progressive water/methanol integration, built-in data logging, fault code reading and clearing, direct electronic wastegate control to prevent throttle closure with exhaust upgrades, exhaust flapper control on most models, and much more.
Unlike traditional ECU flash tuning, the JB4 does not require staged upgrades or additional modifications. Install it as your first upgrade and immediately experience stronger turbo response, smoother power delivery, and significantly improved acceleration.
Wirelessly Connect to your JB4: Our all-new JB4 PRO smartphone connection is included to wirelessly connect the JB4 tuner to your Bluetooth 4.0 compatible iOS or Android device. This option allows you to record and analyze vehicle and tuning data, change JB4 performance maps, and update JB4 firmware as we release free newer versions with updates, more powerful maps, and new features under development. Our new adapter fits fully inside the JB4 enclosure for enhanced weather protection and a more streamlined look. The JB4PRO Free app features an intuitive easy-to-use interface, help buttons, and advanced log analysis tools that can estimate the performance of your car and help identify any tuning concerns.
For more information about the JB4PRO mobile app click here.
JB4 Map Guide for B58
- Map0: Stock tuning – JB4 disabled
- Map1: +3psi over stock (91 octane)
- Map2: +4psi over stock (91-93 octane)
- Map3: +6psi over stock (93+ octane)
- Map4: Absolute target map with peak target of 20psi (93+ octane and/or E30)
- Map5: Absolute target map with peak target of 22psi (E30+ recommended)
- Map6: Custom user tuning map
- Map7: Progressive water/methanol tuning map
- Map8: Valet / Low boost map
This B58 JB4 tuner is compatible with GEN1 and GEN2 B58 engines. For the newest B58TU2 GEN3 motor please refer to the B58 GEN3 JB4 product page.
JB4_B58 is CARB approved under Executive Order D-744-4 for many 2016-2018 BMW applications including the 230i, 330i, 430i, 530i, 340i, 440i, 740i, M240i, and X1.
JB4 Power Gains, Features & Benefits
• Power gains of up to 120hp and 120tq to the wheels.
• Improves 0-60 and quarter mile times.
• Includes multiple tuning maps for different fuel types.
• Quick plug and play installation.
• Supports E85 ethanol blends.
• Reads and deletes fault codes.
• Displays and logs up to 40 engine parameters.
• Boost by gear control for improved traction.
• Controls exhaust flap operation on supported vehicles.
• Compatible with the free JB4PRO app.
• Offers better performance and safety than basic chip tunes.
• Full CANbus integration.
• Runs as smoothly as stock.
• Compatible with all driving modes.
• No impact on fuel economy during normal driving.
• Requires 91 octane or better for performance gains.
• Not VIN locked and fully removable.
• Includes billet aluminum enclosure.
• Designed and assembled in the USA.
• 5-year warranty.
Vehicle Fitment (GEN1 & GEN2 B58)
BMW 1 Series
- 2016-2019 F20 / F21 BMW M140i
BMW 2 Series
- 2022+ G42 BMW M240i including xDrive
- 2016-2021 F22 / F23 BMW M240i including xDrive
BMW 3 Series
- 2020-2024 G20 / G21 BMW M340i including xDrive
- 2016-2018 F30 BMW 340i including xDrive
BMW 4 Series
- 2021-2024 G22 / G23 / G26 BMW M440i including Gran Coupe and xDrive
- 2016-2020 F32 / F33 / F36 BMW 440i including Gran Coupe and xDrive
BMW 5 Series
- 2017-2023 G30 / G31 BMW 540i including xDrive
BMW 6 Series
- 2018-2023 G32 BMW 640i including xDrive
BMW 7 Series
- 2016-2022 G11 / G12 BMW 740i including xDrive
BMW 8 Series
- 2018+ G14 / G15 / G16 BMW 840i including Gran Coupe and xDrive
BMW X Series
- 2018-2024 G01 BMW X3 M40i
- 2019-2024 G02 BMW X4 M40i
- 2019-2022 G05 BMW X5 40i
- 2020-2023 G06 BMW X6 40i
- 2019-2022 G07 BMW X7 40i
BMW Z4
- 2019+ G29 BMW Z4 M40i
What is a JB4?
The JB4 is a plug & play performance tuner for turbocharged vehicles. It connects between engine sensors and the factory ECU allowing it to safely adjust boost pressure, ignition timing, and fueling to produce significant horsepower gains while retaining factory safety systems.
The JB4 stands apart from other tuning systems through advanced CANbus integration, smartphone connectivity, ethanol compatibility, and continuous firmware updates that expand functionality and performance over time.
Is the JB4 a real tune?
Yes. The JB4 actively adjusts boost, timing, air-fuel ratios, and fuel trims using real-time engine data through its CANbus connection. This allows it to produce performance gains similar to ECU flash tuning without permanently modifying the ECU.
California customers – Download the CARB compliant installation guide
Stock vs JB4 Dyno Results
2020 BMW M340i JB4 + BMS Intake on E30
2016 BMW 340xi B58 – 93 Octane vs E30
BMW Z4 B58 – 490whp with JB4 Map5 and E40
Best Tuner for BMW B58 Engine is the JB4.