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Unlike the DME which naturally implements a LOAD control system where boost levels go down when it's cold and go up when its warm.
The opposite of what you generally want for turbocharged performance.
These maps adjust fueling, timing, load targets, VANOS, and other functions on flash side while allowing the JB4 to retain its superior absolute boost control, on the fly map changes, in dash gauges, shift light, auto learning/self tuning, gear dependent boost control, data logging, WMI integration, PI integration, NLS, and other features.
It's simply the best of both worlds and greatly eliminates the need for expensive and time consuming "custom tuning" those running flash only often have to resort to.
USE OF THIS PART IN ANY OTHER VEHICLE MAY SUBJECT YOU TO FINES AND PENALTIES FOR VIOLATION OF FEDERAL AND/OR STATE LAW, WILL VOID YOUR WARRANTY FROM BURGER MOTORSPORTS, INC, AND CAN VOID YOUR VEHICLE'S WARRANTY.
While it's possible to tune an N54 without a JB4 doing so comes with many disadvantages.
In addition the JB4 is quick and easily adaptable to a wide range of setups eliminating the need for expensive custom boost tuning and the risks that come with repeated logs on systems that are not yet setup.
It's not uncommon for engine damage to occur while a new setup is initially being dialed in.
Pedal to boost mapping, spool aggression, boost by gear, and other critical factors can be easily adjusted in dash on the fly to suit the needs for the particular track or racing situation. Whether it's changing the boost/power level, boost by gear setting (including being able to disable it on the fly for burn outs or if traction turns out to be better than expected), pedal input, 2STEP RPM, or what gauges are shown in dash, the JB4 allows a wide range of user adjustment real time from the drivers seat without having to use a 3rd party device or risk programming the DME between runs.
You're able to make the changes while out on the track where you need to make them.