Here's a bit of an update on my experiment to change to the Continental ContiSportContact 7 on my McLaren.
I took the car to the world-famous Millbrook proving ground and had a bit of a play. It goes without saying that I didn't get to do the PZero vs CSC7 testing back to back which makes this all extremely unscientific but it is the best I can do. It was
at least damp for the entire day, sometimes raining enough to be wet. The surfaces on the mile straight, the dynamics pad and the bowl are generally excellent, the alpine road circuit has some deliberately pretty poor surfaces and other surface defects and the handling circuit is pretty decent but is concrete rather than tarmac.
Under 10/10 braking (threshold of ABS kicking in), the CSC7s felt great. I've done similar stops on red hot days on the PZero that felt about the same, which is a win for the CSC7 really given the conditions. On the bowl you can safely do more or less any speed you care to do. I took the car up to about 120-130mph and road noise vs the PZero is drastically lower than the PZero at any speed. I hadn't really thought about the road noise from the PZero vs just being in a carbon-tubbed, minimal sound-deadened car but switching to these tyres really has highlighted the PZero noise. Are they quieter than PS4S? Very hard for me to say objectively because all the cars I've had those on have loads of sound deadening etc (M2, M3, M5) but my gut feel is that the Continentals will be louder.
On the dynamics pad I was able to push the car miles harder than I've ever managed to push the car on PZero. In the dry, I was able to max the front tyre's capabilities safely on an airfield and it felt very nervous/sketchy approaching the limit. CSC7s on a wet day were able to get me to the point of running out of arm strength to corner any harder (repeated 15-20s of sustained max lateral G will do that to you!), with the limit being eventual slight understeer and my own personal skill at keeping it on the road. Still, spinning is good fun
On the Alpine loop there is *absolutely no way* you can push hard on most of it. There is less runoff than on a typical UK B road and there's stuff designed to upset (or ruin) the car all over the place. That said, there's a few little sections where you can push the car a little, particularly when trail-braking into the hairpin and getting on the throttle on the way out. Quite honestly, I think I'd have crashed it on the PZeros at those speeds in the weather we had. Every one of us who've driven cars on PZeros in the cold and damp know exactly how nervous the feeling is until (if!) you can get the heat into the tyre... Gone completely on these Contis, just drive to the conditions with confidence.
On the mostly dry concrete of the handling circuit I think showed up something I have felt from the start, the CSC7 doesn't quite have the ultimate peak grip under acceleration that the PZero does when it is fully hot and sticky. Given that braking feels quite a lot better than the PZero and the lateral grip certainly feels quite significantly different I think this might be a construction/stiffness thing? I don't know exactly but the really high torque demand from low speed corners onto a straight seemed to feel a little more limited than I recall the PZero being. That might just be because the most similar experience I've had with the PZero was on circuit at Croft which has a decent surface and the weather was screaming hot, vs low-teens temps on concrete. More testing needed here. Still, you get more grip more of the time from the CSC7s even if the ultimate peak grip for both tyres is lower. I drive mostly in the UK in UK weather so this is a much better use-case fit for me regardless.