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Which of the settings are you using for in car and out of car vids? I'm going to track attack next week, and scooped up an original GO PRO for $135 plus shipping. I see R3 is 780P but also 60 frames per second.
I have numerous track days using both the original and Hero2. For the origianal and an interior mount I would suggest r5, which has a slight narrow field of view and more importantly use the SPt exposure setting. This will help with the dark interior and bright exterior. When mounted outside, the r3 should work well and then use the Cnt exposure setting.