Do you have any pictures showing the 993 set up? TIA.
As an FYI, there are much better street/track or track/street pads than Porterfield .......
And I'd be willing to argue that the Porterfield's will give you all the stopping power of any of your pads at half the cost. I've tried the others, and stuck with Porterfield, R4s on track, R4S for the street. Would love to try the R-111s next time on the track.
Here's the description of how to fit the 993 air deflectors:
The parts in question are Porsche #993-341-083-00 (left) and 993-341-084-00 (right). Hoehn Acura/Porsche charged me $11.56 each.
After looking at a 993 on a rack to see how Porsche used this deflector, I noted that its upper edge corresponded roughly to the center line of the brake rotor, and that it's outer edge terminated about 1-1/2 inches from the rotor backing plate. The deflector is mounted with the part number molded into it's back reading upright.
The NSX already has a small air deflector mounted to the front of each front lower A-arm (although interestingly the shop manual refers to these as "shields" which they undoubtedly are as well). The NSX deflector is mounted by two horizontal 6 mm bolts into the front of the lower A-arm, and one vertical 6 mm bolt through a lug at the rear of the deflector and into a threaded hole in the top of the lower A-arm.
The Porsche part is held onto a 993 by two vertical bolts through lugs at its rear. It turns out however that one of those lugs is close to where it needs to be to use the NSX's vertical mounting point. All that's required is a metal bar with two 1/4" holes, centers 7/8" apart, to extend the Porsche mounting lug to the threaded hole on the NSX A-arm. I used a piece of 1/8"x1/2" aluminum (about 1-1/2" long), and countersunk one of the holes so I could use a 1/4" flat-head screw to hold that end of the bar to the underside of the Porsche deflector lug because I wanted to keep the deflector mounted as low as possible. The other end of the bar attaches with the original 6 mm NSX bolt in its original location on the upper surface of the lower A-arm.
With that done I used a scratch awl to punch through the deflector at the two threaded holes in the front of the lower A-arm, drilled out the two punched holes to 1/4", and fastened the deflector to the A-arm with the original 6 mm NSX bolts. This of course isn't a particularly well-engineered attachment, since, unlike the original NSX deflector and the lugs on the Porsche piece, there are no pressed-in metal bushings, so you have a threaded fastener bearing against a piece of plastic. A lot of heat, a little vibration and maybe some aging and that fastener will probably come out. For now I just Loctite'd the threads and hoped for the best, but will eventually sink a couple heated bushings into the plastic to make the anchoring more secure. Alternatively you could use 6 mm shoulder bolts like those that hold the NSX spoiler lip and license-plate bracket on. I note though that the original deflector mounting bolts have the green "anti-corrosion" coating, and thread into aluminum, which these shoulder bolts do not in their original application.
In any event, the new Porsche deflector hangs down a couple more inches into the under-body airstream than the original NSX one, and, like the NSX one points pretty directly at a couple holes in the brake backing plate that lead to the inside of the center of the brake rotor, as well as at the general vicinity of the caliper: exactly where you want LOTS of cool air flowing.