| I don't understand most of your questions; 3) Regarding all of this air entering...where is it exiting? I know folks have done louvers in the wheel liners.
The ICs, with stock wheel liners, exits in front of the wheels, parallel to the ground.
I read a fantastic analysis of a production mid engine Porsche (996), and the gains in cooling and aero were noticeably beneficial versus using the wheel wells to dump air. So much so, the radiators are located in front of the wheels on that Porsche.
I believe it was Issue 4 of Bernoulli Magazine What about all of the air coming through the radiator? Is it just being forced across the engine and dumped downwards?
Yes, it exits out past the steering rack and under the car. Additionally around the sides of the motor and out where the downpipes fall. Would hood vents and louvers really pull a lot more air out?
Depends on the vent or louver. At speed, typically, no, as the air pressure on the hood and windshield is far greater then inside the engine bay. The air acting on the hood (higher pressure) would simply push it self into the vents to equalize pressure between the engine bay and the outside air.
 
You could use NACA ducts to over come this imbalance, but you would not be actively cooling the engine... just the engine bay. If I am not mistaking, the venting on the GTR is for cooling the engine bay at rest. If you could incorporate this, then you'd be actively assisting in cooling at speed.
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Petz #3
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Re: Let's talk airflow and cooling... - 
