[darkpuppet]

NOS2Go4Me,Oct 20 2005, 09:56 AM Wrote:I PSI is peanuts tho... 1 PSI is something that you're close to "Creating" with a well-flowing intake anyways. Well not quite, but you get the idea. A higher-flowing intake that supplies as much air as the vacuum of the engine requires is really limited to the actual flow of the intake manifold or the throttle body.

If it takes how many pounds for even the lightly-boosted Focuses here to make any real power, divide the real HP gain by the amount of boost and you'll have a very weak way to calculate HP per lb. of boost.

What will happen here is that the SPI might pick up a bit of bottom-end as you're filling only half the intake runners below 3200RPM, but once those butterfly valves open at 3200, you're filling the second set of intake runners as well and the operating efficiency of said mod is cut in half.

I don't think it's worth attempting.
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actually, if anything, it would give you the greatest gains when the runners are fully open.

since this fan is only generating 1PSI, it's going to basically allow your engine to breath without having to suck as hard. Hell, 800CFM is nearly 300HP of air capability. So any mod you make to make your engine breath better, you'd see a corresponding added gain from this fan.

remember, it's not the number of lbs of pressure you're running, but the amount of air your engine can consume. Lbs of pressure is just the leftovers of trying to cram too much into a restrictive system.