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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > B58 Turbo Engine / Drivetrain / Exhaust Modifications > Should I get JB4 with my MPPSK?
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      02-27-2018, 12:21 PM   #23
Mike@N54Tuning.com
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Quote:
Originally Posted by bradsm87 View Post
No issue? In most tuner's books, no issue means no leaner than 12.5:1, no constant knock detections and fuel trims +/- 5%. Just because the car seems to drive OK does not mean no underlying issues. Any B58 JB4 on map 3 is going to be constantly riding knock detections unless you're running race fuel and it's still running the crazy lean factory AFR target. It's also going to have its fuel trims pretty much maxed out and likely completely maxed out in some spots. You're much better off running less boost and enabling it to run a bit more timing.
Its always good to log.. A log will show if any of the above is happening.

Takes a couple min to log. I always recommend that if running on the edge of what is recommended as each car is slightly different and fuel quality varies. Not all 93 is the same..

Mike
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