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      12-28-2012, 12:06 PM   #35
iDrivino
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Drives: 535xiT
Join Date: Dec 2010
Location: USA

Posts: 50
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The MAP reading for boost off the OBD-II port is limited. What you're probably seeing is minor changes to an artificially clipped value. See http://www.e90post.com/forums/showthread.php?t=506748 for other people who are having the same issue.

Get a dedicated boost gauge or a tune that can display/datalog actual boost.
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