Lemme see if I follow you guys:
Me: "I'm not sure I can use those ducts because I don't have a backing plate."
Nick: "Use that coat-hanger you left in there."
Me: "I may have left a coat-hanger in my brakes, but they still work better than Brembos."
Nick: "Your car is still at S-Squared getting tuned."
Everyone else: "Ohh burn, Scott got owned."
Is that what passes for getting owned around here these days?
Just because my car's not tuned right now doesn't mean my brakes suck. IIRC, I'm the only one w/ ducts on the car around here as it is... so as soon as you guys have a setup better than mine, feel free to chime in and own me.
Anyway... back on topic...
Quote:
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Originally Posted by Dean
Backing plates of some form are pretty much a must for any ducting. Blowing air at the surface of the rotor is OK, but you realy want to blow as much as possible into the center of the rotor to get it to cool through the vanes.
The backing plate can be as simple as a piece of sheet metal cut to fit the stock mounting points. The stock plate can be used for a template even if it doesn't work with your current brake setup.
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Since I've got the STi StopTechs on my WRX, my stock backing plates would have needed to be bent to hell to clear. So I just left 'em off. If you check out the link MikeK posted, you'll see that the guy there used his stock backing plates and cut 'em up so he could mount the hose to the back of the brake rotor. I'm not sure I could do that w/ my WRX backing plates.
However, like I said, I may be able to use that duct Nick posted as is, if I can get it to bolt to the stock backing plate holes. Take a look at the HD version of the ducts on the link that Nick posted. Those look like they've got a chance at working as is, since they seem to have lots of mounting flanges. However, I can't be sure w/o trying, and a 3" duct is too large for my 2.25" hose.
So $80 for something that might not work at all, and will for sure require some work just for hose coupling probably isn't worth it. Especially since I've already got a PVC elbow that dumps air directly into the vents of the rotor, just w/o a backing plate, that works very well. Remember I used my brakes with their existing ducts at T-Hill, RFR and Club Trials w/o a bit of fading, but when I drove Dean's car at RFR w/ the same pads and no ducts, I baked the pads and scored the rotors when the pad thickness wore down past half-way. So it sounds like I'm doing something right... even w/o a backing plate, I'm getting a lot more cool air to the center of the rotor than I would be getting otherwise.