Quote:
Originally Posted by FR-Sizzle
When your driving at 60-80 mph I doubt the 3 holes would make a big difference if any.
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Well, yes, they would make all the difference in whether there was any pressurization at all.
I've spent a LOT of time testing "ram air" systems (on motorcycles, FWIW), on a dyno, in a wind tunnel. My senior design project in college dealt with it - the Kawasaki ZX-11 had just been announced, the first bike (and AFAIK the first road vehicle, period) with a true sealed and pressurized intake tract.
You don't get any benefits AT ALL unless the system is 100% sealed, and you have to be traveling over about 100MPH. Even then, the difference is quite subtle - it's less a power boost than it is a 'reshaping' of the power curve.
"Ram air" systems on cars nearly always derive whatever benefits they provide through cooler air, not pressurization - if for no other reason than street cars almost never go fast enough to gain anything.