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Old 06-17-2010, 08:49 PM   #20
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Join Date: Apr 2008
Location: FoCo
2010 S4


Originally Posted by jason miller View Post
The way I've always been lead to understand the lb/min-hp thing is that 47 lb/min would be 470 crank hp... No? Or are you making a stab at Dynojet numbers here??
That's the way I understood it too, 10 crank hp for ever 1lb/min flow. Garrett even mentions that in their literature.

"What is my mass flow rate? As a very general rule, turbocharged gasoline engines will generate 9.5-10.5 horsepower (as measured at the flywheel) for each lb/min of airflow. So, an engine with a target peak horsepower of 400 Hp will require 36-44 lb/min of airflow to achieve that target. This is just a rough first approximation to help narrow the turbo selection options."
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