I also use Hawk DTC70 for track days. Overall I like them, but I have cooked them at Road America. Last month even at Brainerd I was feeling some inconsistencies in stopping that worried me.
My front 70 pads have very little material left after a 2 day track session. Of course that is with me and my son driving, but overall about 8 sessions. Picture is below.
I have a set of front DTC80 pads that have been sitting in the box for when I finally make it back to Road America. Somehow I need to get more air to the rotors too.
Front Girodisc rotors last me about 2 seasons, so about 4 track weekends before I start seeing enough surface cracks that I get worried.
I'm checking on the 21 and up rotors from Girodisc for next year. I should just have to space out my Viper calipers a small amount and voila, a little more heat sink area and stopping leverage. Can't hurt and the rotors are basically the same price as my replacement 16 models.
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