F Chassis N55 JB4











Ready to take your F chassis N55 BMW to the next level? How
about up to 60hp to the wheels (80hp crank) on a completely stock car or up
to 100hp to the wheels (120hp crank) on a fully modified car? The JB4
features a simple plug and play installation harness for easy installation
and includes many features not found on any other tune. Including the
ability to enable/disable the tuning from the drivers seat, gear dependent
boost control to help with traction, autotuning for E85 mixtures, built in
diagnostic code reading/deleting, expanded engine safety systems, free
firmware updates, in dash boost gauge, the ability to control the exhaust
flapper using your BC button, and much more.



The JB4 does not require any additional modifications or previous stages.
Simply install the JB4 as your first and only modification and enjoy an
entirely new fast and smooth racing experience. For more advanced
enthusiasts the BMS DATA or JB4 Mobile cable allows you to connect a laptop
or smart phone for additional gauges, data logging, and free firmware
updates as we add new features and maps.



The JB4 is a fully plug and play device that installs and removes in
minutes at home without special tools and unlike flash maps that
permanently write over your DME with the JB4 your DME is never aware it's
running more than the factory power levels. And when you're ready to change
things up the JB4 is not VIN locked and can be moved to your next vehicle
or resold. Made in USA. 5 Year Warranty.



Note for electronic wastegate models the EWG add on connector remains
optional and can be purchased separately from our upgrades for higher HP
applications where direct EWG control is beneficial such as those using an
integrated WMI kit or larger turbo.



Note for 2018+ G chassis vehicles with the digital dash layout we have not
yet added in the JB4 commands to allow in dash control but will provide
those via a free firmware update once developed. Until then a JB4 mobile
adapter or BMS data cable is required for any map and setting changes. Also
note 535, 640, and some X chassis models need to use a JB4 mobile adapter
or BMS data cable to select FutureUseD bit#1 on to enable the in dash
controls for those models.













For Reservation (530 USD)

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