Description
Power gains of up to 100HP on a stock vehicle without the risks of flashing!
The JB4 is the most advanced and highly featured tuning system available for your B38, B46, and B48 powered BMW. Power gains are up to 40hp to the wheels (55hp crank) for a B48, gains with bolt-on parts, higher octane, E85 mixtures, and larger turbos are even higher. Now includes the JB4PRO adapter and free app built in!
No ECU flash needed and compatible with locked 🔒 ECUs
The JB4 features a simple plug & play installation harness for easy installation & removal and includes many features not found with any other tune. Including on the fly in-dash map switching between factory and various performance maps, boost limiting by gear for improved traction in lower gears, progressive water/methanol support, built-in data logging, built-in code reading, direct EWG control to prevent throttle closure with exhaust modifications, exhaust flapper control (most models), and much more. Other more expensive tuners may claim to equal the JB4's technology but upon closer examination lack most if not all of the JB4's features.
Remember the JB4 does not require any additional modifications or previous stages. Simply install it as your first and only modification and enjoy an entirely new, fast, and smooth racing experience. The JB4 also does not require any user setup or customization, but for those who are interested in changing maps, logging, customization, and loading new features as we add them, we suggest adding one of our Bluetooth phone adapters!
The JB4 automatically detects between the B38, B46, B48 models at boot up making installation and setup a snap.
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:
Map0: Stock tuning, fully disable JB4
Map1: 3psi over stock added (91 octane)
Map2: 4psi over stock added (91-93 octane)
Map3: 6psi over stock added (93+ octane)
Map4: Absolute target map with peak target of 20psi (93+ and/or 30% E85, EWG connector suggested)
Map5: Absolute target map with peak target of 22psi (30% E85+ fuel, EWG connector suggested)
Map6: Custom tuning map -- see details on JB4tech.com B58 JB4 page
Map7: Progressive WMI map with tuning a function of meth flow and user-defined boost additive.
Map8: VALET / Low Boost Map
JB4_B58 is CARB Approved Under Executive Order (EO) No.D-744-4 for all 2016-2018 BMW 230i, 330i, 430i, 530i, 340i, 440i, 740i, M240i, and X1 applications.
JB4 Power Gains, Features, & Benefits
• Power gains of up to 100hp to the wheels on a stock vehicle
• Improves 0-60 times and 1/4 mile times
• Preloaded with custom JB4 BMW tuning software and up to 8 maps for various fuel and modification levels
• Ethanol (E85) compatible tuning maps
• Able to read/delete fault codes
• View and record up to 40 different gauges/engine parameters in real time with the JB4 app.
• Boost by gear in 1st, 2nd, and 3rd can be controlled via the JB4 app for a perfect launch
• Exhaust flap control for via BC button for most models.
• Compatible with JB4 Mobile for smartphone logging, tuning changes, and adjustment
• The JB4 offers a lot more performance, functionality, and safety than your average performance chip
• Quick Plug & Play Installation
• CANbus OBDII integration offering unrivaled tuning features and performance
• Improved performance over non-integrated chip tunes
• Runs as smoothly as stock, this is how your vehicle should have come from the factory
• Compatible with all driving modes
• Fuel economy unchanged during normal driving
• 91 octane fuel or better required for performance gains
• Not VIN locked and can be removed without a trace and resold down the road
• Includes the rugged JB4 billet aluminum enclosure for protection
• Designed and assembled in the USA
• 5-year warranty
B38/B46/B48 Vehicle Fitment
Note: If your BMW has a B38/B46/B48 engine and you don't see your exact model on the list below please email us.
BMW 1 Series
• 2019-2024 F40 M135i
• 2020+ F40 B48 BMW 128ti
• 2019-2019 F40 B38 BMW 118i
• 2016-2019 F20/F21 B48 BMW 120i, 125i
• 2015-2019 F20/F21 B38 BMW 116i, 118i
BMW 2 Series
• 2022+ G42 B48 BMW 220i, 230i
• 2017-2021 F22 F23 B48 BMW 230i including xDrive
• 2017-2021 F22 F23 B48 BMW 225i including xDrive
• 2017-2021 F22 F23 B46 BMW 220i including xDrive
• 2015-2021 F22 F23 B38 BMW 218i
• 2015-2021 F45 F46 B38 BMW 216i Active tourer and GT
• 2014-2020 F45 F46 B38 BMW 218i, 220i Active tourer and GT
• 2019+ F44 B48 BMW M235i Gran Coupé including xDrive
BMW 3 Series
• 2019+ G20 G21 B46 B48 BMW 318i, 320i, 320Li, 320e, 330i, 330e, 320Li including xDrive
• 2016-2018 F30 B48 BMW 330i, 330e including xDrive
• 2016-2018 F30 B48 BMW 325i including xDrive
• 2016-2018 F30 B46 BMW 320i including xDrive
• 2016-2018 F30 B46 BMW 318i including xDrive
BMW 4 Series
• 2021+ G22 G23 G26 B48 BMW 420i, 430i including Gran Coupe and xDrive
• 2016-2020 F32 F33 F36 B48 BMW 430i including Gran Coupe and xDrive
• 2016-2020 F32 F33 F36 B48 BMW 425i including xDrive
• 2016-2020 F32 F33 F36 B46 BMW 420i including xDrive
• 2016-2020 F32 F33 F36 B38 BMW 418i
BMW 5 Series
• 2017-2023 G30 B46 BMW B48 530i 530e including xDrive
• 2021-2023 G30 BMW 545e
BMW 6 Series
• 2018+ G32 G33 B48 BMW 630i including xDrive
BMW 7 Series
• 2016-2022 G11 G12 B48 BMW 730i including xDrive
BMW X Series
• 2016+ F48 B46 B48 BMW X1 28i including xDrive
• 2018+ F47 B46 B48 BMW X2 28i including xDrive
• 2018+ G01 B48 BMW X3 2.0i, X3 3.0i including xDrive
• 2019+ G02 B48 BMW X4 2.0i, X4 3.0i including xDrive
• 2019+ G05 B48 BMW X5 30i including xDrive
BMW Z4
• 2019+ G29 B46 B48 BMW Z4 30i and Z4 20i
What is a JB4?
The JB4 is a plug & play tune available for turbocharged vehicles. The JB4 tuner installs between your car's sensors and its DME/ECU (computer) and manipulates vehicle performance through these connections making your vehicle much faster. While it's not the only tuning system that operates this way the JB4 separates itself from the competition with much more advanced connection points and processing including CANbus, fuel & spark control, Bluetooth to your smartphone, and a variety of innovative and advanced features not possible with any other system. BMS regularly publishes free mapping and firmware updates adding performance and features as ongoing development allows. In addition, the JB4 system is not VIN-locked to your vehicle and can quickly be removed and swapped between cars or resold at a later time. Often imitated but never duplicated the JB4 has been the gold standard in plug and play turbocharged performance tuning for over a decade and is sold in over 67 countries worldwide.
Is the JB4 a real tune?
Yes the JB4 is a real tune. By tapping into specific sensors and CANbus for real time vehicle data the JB4 is able to alter your boost, timing, AFR, and/or fuel trims, to a similar degree an ECU reflash would, but without the vehicle ever knowing its been tuned. The result is safe, smooth, and significant power and torque gains while retaining your factory safety systems and without having to unlock/flag your ECU.
California Customers -- Download the CARB Version Installation Guide
2018 BMW 330i with JB4, intake, exhaust
2017 BMW 230i with B48 Engine, JB4
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