"KillerRaccoon - Group J's Sébastien Loeb" (KillerRaccoon) 01/13/2015 at 01:17 • Filed to: None

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My ideas on the GT's aero concept, or why it has all those damn holes in it. I first composed them as a response to someone accusing it of needless fanciness on Reddit, but felt it would be good to share them here, too. I will address these damn holes from front to back. Note that these are all educated guesses. edit: pictures (and !!!error: Indecipherable SUB-paragraph formatting!!!

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Hood holes: These allow for exit of air that came in through the grille. That's where the radiator sits. This allows for better weight distribution and a gain of front downforce in an efficient manner. The GT40 and previous GT both used this idea.

Sides of front bumper: Probably front brake cooling ducts. The GT-40 had these, though they were centered in the grille. See above picture

Front of rocker panels: Escape holes for turbulent, high-pressure air sitting in the wheel well. You usually see these higher up on the fender, but it should work somewhat well there too. High-pressure wheel well air tends to bleed into the underbody, directly increasing lift but more importantly disturbing laminar flow across the underbody, cutting downforce, especially by decreasing the diffusor's efficiency. These holes should help mitigate these effects.

Rear of rocker panels: Probably cosmetic. Oh well.

Flough-through areas on the rear body: This idea is similar to the main design feature on the Porsche 919. Instead of diverting air around the car, it's allowed to go straight through . Not only does this decrease the car's drag, but it also allows the air to flow more cleanly to the underside of the wing, which drastically increases its efficacy, as the wing doesn't just push air above it up but pulls up the air beneath it. I am guessing that they will put gurney flaps at the ends of these tunnels for the racing version but left them clean and straight on the street version for better fuel efficiency and top speed figures.

In front of rear wheels: Probably rear brake cooling ducts

Flanking the engine: Engine bay cooling vents. The air will essentially be "pulled" out of the bay through its interaction with the relatively clean flow in the flow-through areas via a coanda-esque effect. The slot below the engine bay window and the louvres flanking it will probably have the same effect.

ly2v8-Brian > KillerRaccoon - Group J's Sébastien Loeb 01/13/2015 at 01:30

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Rear rockers are cooling inlets, with the taillights being outlets for this air as well as above the diffuser.

Squid > KillerRaccoon - Group J's Sébastien Loeb 01/13/2015 at 02:57

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I haven't really read too much about this car yet, but I heard they were using the ecoboost in some form which means turbos and intercoolers. I would think that those inlets for air would be to get air to intercoolers as putting radiators right there might be risky for traffic conditions and lack of being able to get fans powerful enough to pull air through that small gap when sitting in traffic.

DasWauto > KillerRaccoon - Group J's Sébastien Loeb 01/13/2015 at 08:50

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I'm guessing the rear of the rocker pannel intake is actually for the brake cooling ducts and the larger intake above it is for the intercooler(s) or extra radiator(s). Thosr would have been some ridiculously oversized brake ducts.

KillerRaccoon - Group J's Sébastien Loeb > DasWauto 01/13/2015 at 11:20

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Ah, very good point.