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      10-05-2021, 04:27 PM   #13
DrFerry
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Drives: '08 E92 M3
Join Date: Jul 2010
Location: Greenville, SC

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Garage List
2008 BMW M3  [5.25]
2015 BMW X5  [4.50]
Quote:
Originally Posted by Ashley_rj View Post
I am curious M3 post, do you have a dyno chart for your harrop? Also I noticed on the above charts they are suggesting 6.5psi of unverified boost. I have a P3 Gaige which surprisingly does tell me boost numbers and the highest it gets to is 5.
Perhaps there's a boost leak somewhere such as one of the throttle body rubber boots or perhaps the elevation above sea level affecting atmospheric pressure? Either could reduce the peak boost seen on the gauge.

https://www.garrettmotion.com/news/n...r-air-density/
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