Quote:
Originally Posted by mad_sb
has anyone bothered to measure the air pressure in the engine comapartment at the speed people are seeing the hood lift?
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+1
Opening the vent on the fender into the engine bay may not do much to lower under hood pressure because airflow around the fender vent insert is probably funky. Air pressure above the car and over a "flat plate" surface will be lower than under hood pressure due to air velocity over the car. Airflow over the side of the car, especially along a panel which is not flat and uniform in shape (the vent insert), is not always predictable and intuitive. If you have information on the boundary layer shape and other characteristics along the vent insert and know what the pressure difference is between the engine bay and the side of the car, then I say go for it.
Otherwise you're just cutting up a perfectly good car for something to showoff to your buddies without much benefit. Not saying it's not worth it, just that it will be an experiment. And this experiment may or may not fail.