![]() Moreover, map changes can be made while seated in the driving seat! Whether your vehicle has an intake or is fully modified, the JB4 will adjust to the modification and make the most out of it. With over 15 unique maps to choose from (stock maps to race maps), this is the only performance software you will ever need for your N54 equipped BMW. Basically, the JB4 provides safe, reliable increase in horsepower and torque. Also, the 1.3 version improvements include crank position for full 4D engine mapping, air intake temperature for on the fly thermal loading adjustments, direct solenoid control for precise spike free boost control, throttle input for factory like drivability, and fuel pressure control for diagnostic invisibility. The JB4 is the latest generation of the Juice Box Performance Tuner and it features completely new microcontroller based hardware, numerous input/output channels, and integrated safety features. That has all changed with the introduction of the BMS JB4 processor. The factory 135i, 335i, 535i, and Z4 35i ECU comes detuned from the factory and the full potential of the N54 twin turbo engine is inaccessible.
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