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Hi Mistareno, my thinking was that your duct would be awesome in a land speed record car, or a salt flats car.
In a hill climb car though it would be a pity not to use a duct like that to really try and evacuate the air under the car and generate masses of downforce! How much of the car's time will be spent going around corners as opposed to going flat out? Your reduction in drag will be really good, but could the tunnel be better used?
You will also need to circulate some air over the engine and it may be better to use a small NACA type duct to get air into the engine and radiator, slow the air mass down to go over all the hot components and then speed all the hot air up in an exhaust duct and exit it behind the car.
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