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      12-23-2012, 03:29 PM   #4
Mike@N54Tuning.com
BimmerPost Supporting Vendor
Canada
2007
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Drives: 2007 335i, 2015 M3
Join Date: Dec 2008
Location: N54tuning.com

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Boost is measured pre-throttle on ISO so with wheel spin, shift spikes, etc, it's not uncommon to see 18-19psi on E85 mixtures. If you are seeing that on pump gas though you definitely have an issue. The safest thing though is always to do a log and send it in if you need specific tuning advice.

Mike