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To echo FMLYSDN - FWIW - The IR guns are worthless on a rotor as the emissivity of a shiny metal surface is very low. They are not giving off accurate readings and are just giving the gun a reflection of surrounding temperatures. If you look into one of the drilled holes to use it as a thermal cavity, it should give you a better reading. I started working for Fluke developing thermal imagers not long ago and man have i learned a lot about how to read temps.
The only accurate way to get a temp reading from a rotor is a surface touch method (no not your fingers lol). You could potentially paint the outer rim of a rotor to get a reading, as the emissivity of a painted surface will give you an accurate reading. I would get yourself a nice thermocouple thermometer if you are doing off track temp readings.
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2010 E92 M3 DCT
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