| Ok. So I'm intrigued enough now to pull out a calculator. At 60mph = 88 ft/s = V
Pi = 3.
Inlet Pipe Diameter = 2.5/12 ft = D
CFM = Pi * D**2 / 4 * V * 60
CFM = 172 So at 60 mph with a 2.5" inlet pipe you need LESS than 172 CFM through the pipe for there to be any pressure head in the pipe or benefit to RAM air. Ash's charts indicate this is a benefit between 1,000 and 3,500 rpm depending on boost. At 60 mph, less than 3,500 rpm, it doesn't seem like RAM air has much power benefit. There may, however, be a lag time or spool up time benefit going from "no boost" to "some boost" since the ram pressure is available immediately when the throttle plate opens. But at less than 3,500 rpm at 60 mph I wouldn't put much stock into it. Somebody check my crude math and rationale!
OverZealous (CT)
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