In their release, Audi admitted that the R15 struggled in medium speed corners and when the track was greasy--both related to their LM downforce spec. They had a harder time keeping tire temperature and that slowed them when it sprinkled, especally in the moderate speed corners.
Oddly, this is the opposite of Spa in '08 when the 908s were faster in sectors 1 and 3, and the Audis were faster in sector 2 because they had a more agressive downforce package.
If they had more downforce, they would've kept temperature in the tires better, and handled better in the medium speed corners. It seemed that the Audi was fine in the dry and when it was wet, but when it was slick, their LM spec areo did them in, as well as having to pit for intermediate tires because they couldn't keep heat in the slicks when it drizzled.
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