Transform your BMW B58, B48, B46 and B38 performance with the Burger Motorsports JB4 Tuning Box. Perfect for M140i, M240i, 220i, 230i, 320i, 330i, 330e, 340i, 440i and more, this plug and play piggyback ECU upgrade delivers huge power gains, sharper throttle response and true customisable tuning without a full remap.
We run the JB4 on our own cars and our customers love it for its reliable power, factory-like drivability and class-leading features. If you are searching for BMW B58 tune, M140i tuning, 340i tuning box, 440i tune, 330e tuning box, 320i tuning, 220i 230i JB4, BMW B48 tuning or BMW piggyback tuner, this is the proven solution.
Why choose the BMS JB4 for BMW B58, B48, B46, B38
- Massive power gains on stock cars: up to 80 hp to the wheels on B58 and up to 40 hp to the wheels on B48 on pump fuel. Even more with bolt-ons, higher octane, ethanol blends and upgraded turbos.
- True plug and play installation and removal using a purpose-built harness. No permanent changes. Not VIN locked and can be removed without a trace.
- Up to 8 maps for different fuels and modifications with on-the-fly switching. Runs smoothly like stock in comfort modes yet delivers serious performance when you want it.
- CANbus OBDII integration for unrivalled functionality: boost-by-gear, in-dash gauge options, exhaust valve flapper control, water meth support, built-in data logging and code reading.
- Compatible with JB4 Mobile via Bluetooth Connect Kit or with the BMS Data Cable for laptop tuning, logging and free firmware updates.
- Made in the USA with a rugged billet aluminium enclosure and a 5 year BMS repair warranty.
Looking for a remap alternative for BMW M140i tune, BMW M240i tune, BMW 340i tune, BMW 440i tuning, BMW 330e tuning box, BMW 320i 330i 540i 740i Z4 X3 X4 X5 JB4? The JB4 is the most advanced and feature-rich BMW tuning box available.
Key Features
- Power gains of up to 50 hp to the wheels on a stock vehicle. Up to 80 whp on B58 and up to 40 whp on B48 depending on fuel and conditions.
- Improves 0 to 60 mph and quarter mile times.
- Preloaded BMW-specific tuning with up to 8 maps.
- More performance, functionality and safety features than typical performance chips.
- Quick plug and play installation.
- Billet aluminium JB4 enclosure for protection.
- CANbus OBDII integration for advanced control and data.
- Smooth OEM-like drivability. Compatible with all driving modes.
- Fuel economy unchanged during normal driving.
- Compatible with JB4 Mobile app for smartphone logging and tuning changes.
- 91 octane fuel or better required for performance maps. Ethanol E85 compatible maps available.
- Able to read and delete fault codes.
- Not VIN locked. Removable and resellable.
- Made in the USA.
- 5 year BMS repair warranty.
We also recommend adding the Data Cable or the Bluetooth Connect Kit for logging, map selection and firmware updates. JB4 Mobile app purchase required for smartphones.
Map Guide v13+
- Map 0: Stock tuning. Fully disables JB4.
- Map 1: Additive, peak of 3 psi over stock added. 91 octane.
- Map 2: Additive, peak of 4 psi over stock added. 91 to 93 octane.
- Map 3: Additive, peak of 6 psi over stock added. 93+ octane.
- Map 4: Additive, peak of 6.5 psi over stock added. 93+ octane.
- Map 5: Additive, peak of 6 psi over stock with more aggressive timing for higher octane. 93+ octane, suitable for bolt-on modifications.
- Map 6: Custom tuning map allowing additive targets below 10 psi and absolute targets above 10 psi.
- Map 7: WMI map. Boost varies with WMI additive and map settings.
- Map 8: Valet or low boost map.
What’s Included
- F chassis B46 B48 B58 JB4 unit
- Extended OBDII cable for RHD cars, also fits LHD
- EWG connector
- Billet aluminium case
Compatibility
BMW 1 Series
- 2021+ F40 B48 128ti
- 2019+ F40 B48 M135ix
- 2019+ F40 B38 118i
- 2015+ F20 F21 B58 M140i
- 2016+ F20 F21 B48 120i, 125i
- 2015+ F20 F21 B38 116i, 118i
BMW 2 Series
- 2022+ G42 B58 M240i xDrive
- 2022+ G42 B48 220i, 230i
- 2017+ F22 F23 B58 M240i iX
- 2017+ F22 F23 B48 230i iX, 225i iX, 220i iX
- 2015+ F22 F23 B38 218i
- 2015+ F45 F46 B38 216i Active Tourer and GT
- 2014+ F45 F46 B38 218i, 220i Active Tourer and GT
- 2019+ F44 M235i iX
BMW 3 Series
- 2020+ G20 G21 B58 M340i M340iX
- 2019+ G20 G21 B46 B48 318i 320i 320Li 320e 330i 330iX 330e 320Li
- 2016 to 2019 F30 F31 F34 B58 340i 340iX
- 2016 to 2018 F30 F31 F34 B48 330i 330iX 330e
- 2016 to 2018 F30 F31 B48 325i 325iX
- 2016 to 2018 F30 F31 B46 320i 320iX
- 2016 to 2018 F30 F31 B46 318i 318iX
BMW 4 Series
- 2021+ G22 G23 G26 B58 440i 440iX Gran Coupe
- 2021+ G22 G23 G26 B48 420i 430i 430iX Gran Coupe
- 2016 to 2020 F32 F33 F36 B58 440i 440iX Gran Coupe
- 2016 to 2020 F32 F33 F36 B48 430i 430iX Gran Coupe
- 2016 to 2020 F32 F33 F36 B48 425i 425iX
- 2016 to 2020 F32 F33 F36 B46 420i 420iX
- 2016 to 2020 F32 F33 F36 B38 418i
BMW 5 Series
- 2017+ G30 B58 540i 540iX
- 2017+ G30 B46 B48 530i 530iX 530e
- 2017+ G31 B58 540i 540iX
BMW 6 Series
- 2018+ G32 G33 B48 B58 630i 640i 640iX
BMW 7 Series
- 2016+ G11 G12 730i 730iX
- 2016+ G11 G12 B58 740i 740iX
BMW 8 Series
- 2019+ G14 G15 G16 B58 840i 840iX Gran Coupe
BMW X Series
- 2016+ B46 B48 X1
- 2018+ B46 B48 X2
- 2018+ G01 B48 B58 X3 2.0i 3.0i M40i including xDrive and sDrive
- 2019+ G02 B48 B58 X4 2.0i 3.0i M40i including xDrive and sDrive
- 2019+ G05 B58 X5 40i 40iX
- 2021+ G05 X5 45e
- 2019+ G06 X6 40iX
- 2019+ G07 B58 X7 40i
BMW Z4
- 2019+ G29 B58 Z4 M40i
- 2019+ G29 B46 B48 Z4 30i and 20i
Will work on most BMW models with B48 and B58 engines even if not listed above. If you are unsure, contact us and we will be delighted to double check for you.
Performance and Compliance
- JB4_B58 is CARB approved under Executive Order D-744-4 for 2016 to 2018 BMW 230i, 330i, 430i, 530i, 340i, 440i, 740i, M240i and X1 applications.
- Use high quality fuel. Performance maps require 91 octane or better. Ethanol blend maps available where applicable.
Installation and Support
Plug and play install with model-specific harness. No coding required. For professional fitting, book with Nforcd in Warwickshire. Email Sales@nforcd.com for a fitting quote and availability.
Wirelessly connect the JB4 to your iOS or Android device via the JB4 Mobile Bluetooth Connect Kit, or to your Windows laptop with the BMS Data Cable. Both options allow logging, map changes and free firmware updates as new maps and features are released. JB4 Mobile app purchase required.
Compatibility Check
We will confirm fitment prior to dispatch. Provide your UK registration number or the last 7 digits of your VIN at checkout and our team will run a compatibility check.
Photos and Videos
JB4 Tuned M140i
How to install (US - LHD)
JB4 B48 B58 CANFlap Exhaust Flapper Test
JB4 F Series OBDII CANbus Wheel Control Demo
JB4 Bluetooth Phone Logging Demo
More Information
Manufactured by: Burger Motorsports
Warranty: 5 year BMS repair warranty
Part Number: F-B46B48B58-JB4
Buy with confidence from Nforcd
We are BMW tuning specialists. The JB4 is our go-to tuning box for BMW B58 and B48 engines because it is fast, flexible and safe. Our customers consistently report stronger mid-range punch, quicker 0 to 60 performance and effortless overtakes in their M140i, M240i, 340i, 440i, 220i, 230i, 320i, 330i, 330e and more. Order your JB4 today and unlock the performance your BMW deserves.