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Originally Posted by sperry
I'm not a aerodynamicist so I'll defer to JC on the details, but the way a bug deflector works is by spoiling air at the leading edge of the hood so bugs are deflected by the airflow up and away from the hood/windshield.
If you're attempting to use the same principle to direct more air at the hoodscoop, you're going to also be directing anything in that air at the scoop, and therefore the windshield behind it. I.e. bugs and the like that would normally by pushed aside by the shape of the hood are now being directed at the car.
Not only would such a "vortex generator" probably work worse than a properly designed hood scoop, it would probably concentrate bugs into the scoop, and on the windshield, not to mention the possible effects during wet conditions... personally I'd rather have as close to laminar flow over my windshield, rather than a swirling mess of rain/snow.
...but again, I've got no background in aerodynamics aside from a general understanding, so I'll differ to the people that know more about these things like JC and AtomicLabMonkey.
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I agree with some of what your saying, but keep in mind that the "bug deflector" wouldn't work on a WRX retaing the TMIC. I'm just saying if you have a rock guard on the front of your hoood to protect it from chips, why not design it so that it points more or the same amount of air into the scoop instead of hampering the flow. Then you can have your cake and eat it too.
Sure, more bugs are going to hit your car than if you were running a true bug deflector that pitches air and debris over your car, but that's not an option on TMIC car. The amount of bugs/debris that hit your car with the vortex generator hood protector thingy would be similar to without, I'm guessing.
JC, I got the word "vortex generator" because the EVO MR has one on the rear edge of the roof to put more force on the rear wing.
Maybe it is a dumb idea. I mean if you've got a couple of aerodynamicists on your side, I'll just shut up.