JB4 Performance Tuner for B58

The Burger Motorsports JB4 is the most advanced plug-and-play tuning system available for BMW B58 turbocharged engines. It is designed to deliver substantial power gains, with reports of up to 120 horsepower and 120 lb-ft of torque at the wheels on a stock B58 engine using pump gas. For vehicles with bolt-on upgrades, higher octane fuel, or E85 mixtures, even greater gains are achievable. This tuner features a simple plug-and-play wiring harness, enabling quick installation and removal while providing advanced capabilities. These include on-the-fly map switching, boost-by-gear control for better traction, progressive water/methanol integration, built-in data logging, and fault code reading/clearing. Unlike traditional ECU flash tuning, the JB4 does not require staged upgrades or permanent modifications, offering immediate improvements in turbo response, power delivery, and acceleration. Both Gen1 and Gen2 B58 versions include the JB4PRO adapter and free app for wireless connection to iOS or Android devices via Bluetooth 4.0. This allows for recording and analyzing vehicle data, changing performance maps, and updating firmware. The JB4_B58 is CARB approved under Executive Order D-744-4 for many 2016-2018 BMW applications. However, it is noted that the product is "Not for sale or use in the state of California on any pollution-controlled vehicle as per the California Air Resources Board."