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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > DCI install and boost oscillation



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      11-20-2012, 03:16 PM   #1
Lankster
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Drives: 2007 335xi
Join Date: Apr 2012
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DCI install and boost oscillation

Have JB4 and just installed BMS DCI. Manual says that the JB4 will take a few days to learn the new air flow and I understand that.

But in my first test drive, boost was hitting max 8psi and when shifting from 2-3, it would peak 10 and then drop down to 8 again. Pulled over to take a video of the boost gage (fuel gage), but when I pressed record and did a 3rd rip it looked fine... Is this oscillation the JB4 learning? (search yielded little information)
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