Black and other very dark colored cars don't typically shoot well midday when the sun is out and the skys are clear. There are some exceptions to this, but it seems to generally hold true (at least for me). 'magic hour' works great for them as does overcast/slightly overcast days. Alternatively, if you don't need sky in your shots, you can also just shoot them in a shaded area. Just mind where/how you frame your shots so you don't get great variance in exposures.
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