this idea goes back way further than 2007!
Quote:
Originally Posted by solex3274
Interesting subject. I have added a 924 turbo hood and header panel to my 924S simply because it looks good, but have wondered if it could be made functional. The problem with the turbo duct is that it is on the wrong side of the hood and would require a pipe with too many bends. The header panel provides four small vents of air, but difficult to tap into. Therefore I have been using a cone style air filter which provide a nice sound, but that's all.
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Quote:
Originally Posted by curtisr
Sol, I too have thought that with a change in place for the scoop this could be the answer. And then I saw these hoods: (I don't believe the placement shown in these pictures is above the IC.)
By the way, it turns out this idea was tackled as far back as 2007 http://forums.pelicanparts.com/porsche-924-944-968-technical-forum/358970-its-hood-scoop-time.html
Still others have talked about pressure differential, turbulence and more. It's here I'm stumped. Truth is, I don't feel an overwhelming desire one way or another but, if I got a few extra horsepower, why not?
With this nose panel, should one not have a cone in the engine bay???
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not sure about the 2nd pic but the other 2 pics are of 924GTR's. The IC is in the nose like a 951 and likewise the turbo is on the coldside, most likely under those scoops.
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The basic 924 turbo had a log style exhaust header with the turbo on the hotside. This is what the NACA duct is for on the 924 turbo, to help cool the exhaust manifold. I've got a porsche brochure saved on my external that explains it. It doesnt just work at speed but also lets heat escape at a stand still.
re: the 924 turbo nose vents, I added a pod filter to my 924 turbo and noted an increase in intake noise and a decrease in performance. The factory added those vents to aid engine bay cooling. iirc the sheetmetal under the panel is not setup to direct air to any one point, ie to a filter. My stepfather later had a 924 turbo racecar with a 951 i/c and pod filter. As soon as I saw it I told him to get rid of it.
Even with those vents my old 932's airbox draws air from behind the headlight.
All the pod filter did was save the weight of the airbox and free up some space.
imho the 944's factory airbox with the snorkel into the wheel well is a better solution than any backyard attempt i've seen, and those backyard attempts have no imperical evidence to prove otherwise.
The only tried and true mods I've seen on these boards with data to back them are the 968 airbox mod Ernie and Flash are talking about and this 952 setup:
Without proper development and testing I think you're just wasting time, money and body panels, messing with airflow and air pressure differentials for the novelty of a different look.