Tested Grand Valley in the C60 Hybride last night; getting consistent low 1:41's once the tyres were up to heat (about lap 3) until about lap 7, when tyre degradation was adding about 3-4 tenths per lap.
Re. A few others comments about the looseness of the Pescarolo's: I could understand this might be a real problem if tuning was prohibited, but considering you have the scope of working the diff, cambers, toes, springs and dampers ... it's very easily ironed out according to your driving style, IMHO. Not to mention TCS if you really need it too.
No matter what car I'm in, I never use TCS, or ASM. It slows you down. You can tweak out the same control results from the diff alone.