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I also think that 3s is too much for tires alone, unless Pirelli don't bother at all to bring a decent spec customer tires. Based on WEC 2012, the tire difference between Michelin and Pirelli confidential tires, for the GTEs, should be in the 1.5s ballpark.
IDK, Mike Hedlund already told us that the tires on PWC are relatively very good, compared to Contis/Hoosier. Maybe Pirelli takes worse customers tires, to Blancpain, on purpose. If the stints lengths are different, then, that could be it because Pirelli tires normally, not only in F1, tends to wear relatively quicker and when they bring durable tires to the racetrack, the performance usually get's relatively worse, ie, when compounds need to be harder, then Pirelli struggles more than when compounds can be from softer ranges.
Nevertheless, GT Open has much less reputation than Blancpain, so it's somewhat curious that their actually lap 3s quicker
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