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djdawson2 djdawson2 is offline
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Join Date: May 2009
Location: Evergreen, CO
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PR= pressure ratio. It is your boost level + atmospheric pressure divided by atmospheric pressure. If you are running one bar at sea level, it is (14.7+14.7)/14.7, or 2.

A very good rule of thumb is 1lb/minute equals 10 flywheel horsepower... 55lbs/hour would be good for 550fhp. This has proven very accurate in my automotive escapades.

A great book to read is "Maximum Boost" by Corky Bell. A nice easy to read basics book that clarifies a lot of what is being discussed in this thread.
Old 02-03-2010, 09:08 AM
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