Quote:
Originally Posted by HGR Z1LE
I was told iron rotor start to glow above 1200f. I used the stranoparts 750f,1000f,1250f temp kit. When I use ds2500 and xp8 with stock tire, temp is between 750 and 1000 after hot pit stop. After I change to r-comp tires, I used both xp12 and rp2. They defintely exceed 1000 and 1250 at Gingerman.
I think cracked iron rotor is unavoiable if the car is tracked even with cooling duct. At long as the pad life is normal, additional cooling is not necessary, but it will dramatically increase pad life and save the brake system!
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Iron starts to glow visibly in daylight below 1000F, just FYI.
In all the years I've been tracking, I've only seen heavy cars crack rotors, most commonly C5 Corvettes. I went over 4 years on the same rotors in my Exige S, no cracking, and virtually no wear either for that matter. My Miata has gone the last 2 seasons on the same insanely cheap Wilwood rotors, also no visible rotor wear despite chewing through pads quicker as it's heavier than the Lotus with worse weight distribution. The 1LE still has some catching up to do to match my Exige S pace on track, and it certainly won't do it by following in the footsteps of the C5 'vette. The rotors need cooling on this heavy beast.