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Posts: 6,139
Join Date: Oct 2013
Car: e90 335i
Default 04-09-2019, 09:42 AM

Originally Posted by Ryan81789
I have some logs of my car. Not sure if Iím using the JB4 as well as I could be if anyone could look and explain it a little bit to me. Doesnít seem like the boost holds thru the rpm range
Best to post in the support section.

What mods do you have? You have some overboosting in the upper RPM actually.

JB4 firmware is really old, update that to the latest one and follow the directions here:
E Series N54 JB4 - - International Turbo Racing Discussion
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