How about y'all take your stainless
screwing somewhere else to play with???

This is a gd BRAKE thread!
Ok class, I did an experiment today (not that you give a ....) re. brakes: After installing the 310x32mm Ultralite 32-fin Wilwoods+alloy bells+4pots years ago, every time I hit the track the discs would warp after a couple of hard laps (summer or winter). A crappy condition, corrected only with subsequent on-car truing. Everything back to normal until the next time, same occurrence. Pretty soon the 32mm disc became 29mm, dangerously thin for the Ultralite type. I THEN thought about removing the stock splash guard (stone guard?)

as I figured there must be great temp differential between the two disc faces. I decided that the ultimate (worst case) test, would be to hit the track with these thinned-down discs and see what would happen. The greatly reduced thermal capacity would tax the system and IF it didn't warp this time, the move was right (I have no other brake cooling arrangements like ducts, this being a street car). Well,they
DIDN'T warp but after ~30 laps they developed the next best thing to warping: cracks! One of them ~20mm long and some smaller ones. (I'll try to post pics soon). I thought it prudent to quit and head home. Also, I had to pump the pedal 2-3 times and I suspect fluid boiling (RBF600 but its over a year old, pads being DS2500). Some other guys were bleeding their calipers after a few laps, but I didn't bother.
When warping was bugging me, I contacted Wilwood and was told Ultralites are the wrong choice for a 1400kg car on a heavy braking track and I should have the Heavy Duty 48-fin rotors, so I ordered and got them. Weight difference with the Ultralites is 1.5lbs (700gr)ea. Today's test proved I could have bought the Ultralites again, since the warping cause was definitely found. Maybe obvious to you guys, but I had to find out. BTW, between studs, ON-wheel temp got to 122*C today! All in all, a great perfect weather day (short sleeves Mats!!

)
Jim K.