Quote:
Originally Posted by bradford
The problem with the OEM calipers is that the throat is too narrow. You simply can't get a rotor with sufficient thermal mass in there. The Stoptechs would be too thick. I don't have the exact specs on the OEM throat width but it is very visible looking at the OEM rotor. It's a decent diameter at 13.3" but it's skinny as hell. Looks like a record - makes the Stoptech one look like a manhole cover. 
If you want to stick with the OEM setup (I sure didn't want to drop the 3 Gs on Stoptechs, but I'm a very aggressive track driver) your best bet is good fluid, Ti plates, try to stuff a duct in there (not really an option for me on a daily driven car that needs to be able to parallel park and still fit 245mm R-comps up front), and remove the OEM dust shields (or trim them and fashion a flange to use with the ducts to deliver air to the center of the rotor) |
My pistons shattered last weekend, after a few days at Watkins Glen. Going to see if there is finally a rebuild kit (heard there was not), but if not, then I'm pressing to get the calipers replaced, like bradford was able to.
I went with HP+ and ATE 200 fluid. Thought I would be fine in the A Group, but I guess not. Huge amounts of fade, and I could feel the pistons crushing, by the pedal dropping a 1/4" in at times, during hard braking.