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I ran XP10 at the track this weekend. On stock brakes and tires the backing plated turned black. On stock brakes and RE11A I turned the backing plate white.
On stock with XP10 I find the pedal is very firm and easy to use. On the AP sprint kit I find the initial bite to be non existent. The first bit of travel does nothing IMO. I got used to it thought and maybe it is a good thing because you can just stand on the brakes. Since the first bit doesn't do much it doesn't unsettle the car. Also to note the XP10 pads still have orange paint so they did not get hot at all.
Not sure what to conclude but I have a few thoughts. Maybe there is a little air in system, though I bled twice and it feels firm on street pads (carbotech 1521). Or overall the car and tires are not enough for this pad compound, maybe should try XP8. Or (most likely) I'm just slow and don't get enough heat into the brakes.
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