Quote:
Originally Posted by jpc647
Are you on the max setting for the jb4? Arent you worried about pushing the driveline that hard?
I know this post was a while ago. But, do you still have it? How's it been holding up?
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There are many of us running the JB4 on the N55 X1, without any issues, of course.
Remember, the car is just a 335 xdrive. There are literally thousands of N55s running JB4s out there. It's the most-popular tuning option. There are many people running MUCH more power through this drivetrain without issues.
What setting people run is going to depend on a few things like available octane and other modifications.
Dare I say most people just run the auto-tune map (map 5), and let the JB4 set your boost depending on current conditions (temp, octane, etc.).
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'02 S54 M3 (500/500 GC/Koni)
'08 N54 135 (JB4, DCI, BMW PS/Bilstein B6s, H&R M3 FSB, Strongflex FCABs)
'14 N55 X1 (JB4, BMS DP, BMS Intake, Alpina TCU reflash, H&R Sports, Bilstein B6s, E93 M3 RSB, Strongflex FCABs, baby seat)
'08 N54 535xi touring (Bilstein B6s, Downpipes, MHD tune, baby seat)