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Isn't all flow bench testing subjective? In a running engine, you start around zero pressure differential (when the intake valve opens how well is the exhaust doing its job) and go up to maybe 100" or more. At 6500 RPM one crank rev (360 degrees) takes 9.231 Milliseconds.
What is being done is the same think as step testing on an engine dyno verses true acceleration testing.
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