Ready to take your BMW B38/B46/B48/B58 turbo to the next level?
The JB4 is the most advanced and highly featured tuning system
available for your B58 and B48 vehicle. Power gains are up to 60hp to
the wheels (80hp crank) on a completely stock car on pump gas for a
B58 and up to 40hp to the wheels (55hp crank) for a B48, gains with
bolt on parts, higher octane, and larger turbos are even higher.
The JB4 features a simple plug and play installation harness for easy
installation & removal and includes many features not found with any
other tune. Including on the fly in dash map switching between factory
and various performance maps, optional in dash gauge displays for
boost, boost limiting by gear for improved traction in lower gears,
progressive water/methanol support, built in data logging, built in
code reading, optional direct EWG control to prevent throttle closure
with exhaust modifications, exhaust flapper control, and much more.
Other more expensive tuners may claim to equal the JB4's technology
but upon closer examination lack most if not all of the JB4's
Remember 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. The JB4 also does not require any user setup or
customization but for those who are interested in logging, adding new
features as we post them, etc, we suggest the BMS DATA cable or REV3
mobile phone adapter. The JB4 automatically detects between the B46,
B48, and B58 models at boot up making installation and setup a snap.