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I did some tests for before and after rear brake shield. I used temp paint.
basically there were no difference before and after rear brake shield removal. color came out the same, see picture: on the edge of the rotor was where I applied the paint. on the right is before, on the left is after.
of course, not very scientific. it is possible temp paint can't show improvement less than 100F. so it is possible it works, just not very well.
my next test would be to run brake ducts. will report back.
While looking for a new avatar picture in my albums, I ran across a couple of pics that pertain to caliper temps, or at least sustained temps seen at the caliper. In the first picture you will notice how I had painted my calipers with G2 paint years ago. I schemed the front and rear the same.
Next, you can see the discoloration after one track day(my first back in '04). Now, obviously there were probably hotspots in the areas painted black, but what you will notice is the difference in general areas exposed to high temps between the front and rear. On the fronts, it seems as though the heat radiates evenly from the center of the wheel/hub. On the rear, however, this does not follow suit. It seems as though the heat is more heavily concentrated at the top of the assembly. Food for thought for those considering ducting the rears. Stock front bumper; no ducting.
^^^ i can verify that you are correct.
my previous track day at NJMP last week, i was able to use my new 1200* heat gun. for the front, the outer edge of the rotors are usually 50*-75* cooler than towards the hub. for the rear, the outer edge of the rotors were hotter.
i think it's because the front are vented which means the area where the vents are cooled faster than the center.
