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E90 M3 (Sedan) | E92 M3 (Coupe) | E93 M3 (Convertible) (2008-2013) {Engine: S65 - Max Hp: 414 hp (420 hp Euro) at 8,300 rpm / 295 lb/ft at 3,900 rpm}


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Old Thu, Oct-30-2008, 11:16:48 PM   #41
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Yeah, there is a large region in the front of a relatively blunt body like a car that has a total pressure near stagnation pressure. The whole front face of the radiator for example. Assuming you have an air intake in this region (note that it doesn't have to perfectly face the freestream direction even), it will see close to stagnation total pressure at its inlet. (i.e. in your diagram A~=B~=C).
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Old Fri, Oct-31-2008, 07:29:30 AM   #42
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only one i found...
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Old Sat, Feb-21-2009, 09:26:41 PM   #43
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here's another picture i had when i did the RPi install

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Old Wed, Feb-25-2009, 05:57:52 AM   #44
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Looks great!
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Old Wed, Feb-25-2009, 12:03:14 PM   #45
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The only "home made" test to see whether the hood intake has positive or negative pressure with RPI intake is as follows: (you can laugh but it will work)

Cut out a thin plastic (supermarket bag) with the shape of the intake. Place over intake on a running engine, it will get sucked down into place because of pressure difference.

Start driving and fast!! (Do not let off the throttle, I guess DCT would be the best car for test) the speed at which the plastic falls off should be speed at which pressures are getting close to each other, and it would be safe to assume that from that point on you will start seeing some positive pressure on the airbox.

So who wants to go first? :-)
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Discussing RPi Ram Intake Scoops with Dyno. [14 whp] in the E90 M3 (Sedan) | E92 M3 (Coupe) | E93 M3 (Convertible) (2008-2013) Forum - {Engine: S65 - Max Hp: 414 hp (420 hp Euro) at 8,300 rpm / 295 lb/ft at 3,900 rpm} at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)