Jb4 menu 12. 8k to 2k and i'm wondering what performance impacts this will have? (lowe...
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Jb4 menu 12. 8k to 2k and i'm wondering what performance impacts this will have? (lower total possible boost?) Feb 26, 2026 · Got two separate items for sale. com Joint Chiefs of Staff 4901 Rep 115,955 Posts Drives: 2007 335i, 2015 M3 JB4 Firmware Downloading Tap the Firmware Update section of the settings area of JB4 Mobile. com). The JB4 works by intercepting and altering the signal going to the ECU hence you will remove the factory plug replacing it with the plug on the JB4 harness and plug the factory plug into the JB harness. I installed JB4 on my 2015 M235i today. The JB4 installs between your car's sensor and its DME/ECU (computer) and manipulates vehicle performance through these connections. com Joint Chiefs of Staff 5100 Rep 116,225 Posts Drives: 2007 335i, 2015 M3 I'll mess with that tomorrow and see where mine stand but like a general idea were would "stock" jb4 setting would it be at if you remember or not I would adjust between 3. I fiured out how to bring up the menu on the dash, and I changed mode 0 to map 5, but I can't figure out anything else. T BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > New JB4 Steering Wheel Command Menu Thread Tools Search this Thread 05-03-2011, 02:57 PM # 1 Mike@N54Tuning. I'm beginning to wonder if the steering wheel controls are saving my changes, because when I go back to the option 12 it's back to zero.
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