Regarding brake ducts, I've done Ghetto on our GTP for a track day, and I've done more "professional" on my Mustang, but I have pics of neither.
On the GTP I used 4-inch to 3-inch galvanized reducers from the Home Depot ducting department, hose-clamped to 3-inch semi-rigid aluminum ducting routed back to the engine subframe and then along the A-arm and pinched down to fit in the wheel and point up into the center of the rotor. The whole thing was zip-tied in place with the "scoops" exposed to airflow just under the outside edges of the front fascia...I would have used the foglight holes but the fascia and bracketry for the lights is not easily enough modified to be able to put it back when I was done. and held up fine for several weeks until I took it off since it's my wife's daily driver. Cost maybe $40 to do.
On the Mustang I fabricated some scoops out of long-taper funnels and screwed them to the bottom of the fascia. It's an LX so I don't have foglight holes to work with. I then used high-temp 2.5-inch silicone ducting (the expensive stuff) and ran it back and then along the A-arm to the rotor area. I was going to connect it to an exhaust reducer as a "nozzle" at the brake end but I couldn't get them in time for its inaugural track event so I didn't bother, I just kept an eye on the tubing to make sure it didn't overheat and it's been fine. Again, the whole thing is zip-tied in place with the exception of the brake end which is held to the spindle by a hose clamp pierced through the tubing and around the wire reinforcement of the hose. I'll get some decent pics of it all soon.
As for the technical discussion, BRAVO, I agree with Rara that it's for the good of the board. I am not a degreed engineer but I understand the principles. Farther up the board I was about to say that once the rotor reaches its saturation point it doesn't can't take any more heat and guess what, the friction coefficient changes and there go your brakes. But Rara beat me to it with a far more technical description than I can muster and then everybody started whipping out the greek letters LOL.
Then I stepped away, for a long time. Having a son and losing a brother in the same weekend kind of dampened my enthusiasm.
And I'm proud to be involved with a very intelligent group of "retards" who keep hashing this [censored] out for the benefit of people who may otherwise not have access to anything but "yo, dese are da shizzle-bomb, I saw them in a magazine".
