Well, an update on the tires: I had the PS4S fitted yesterday on the GTS and got to throw away the Pirelli PZeros, just in the quick drive back from the dealer it happened to be raining and 11ºC and the difference was immediate... what a huge difference in the wet, and they weren't even run in yet.
Today I did 200 miles in rain and got to try them some more, my 911 is no longer handicapped in the rain finally! after the ordeal with the N0 and N1 Pirelli P-Zeros.
I seriously don't understand how those tires got the N rating from Porsche, its not like its a little difference from similar model to model, in the dry they were fine but in the wet they were the worst tire I ever had on a 911, and I have put over 400,000km on 911 and countless sets of tires through 996-997-991, I'm not a sunny Sunday boulevard driver.
Best description how the P-Zeros feel on the wet in the GTS is like old out of date tires that have hardened and may look fine and feel fine but have no grip. If it were one set I could think that maybe there was something wrong with that batch, but after the N0 I put on the newer N1 and same thing, a bit better but still very poor. The only explanation I can think of is that they were tight on time when launching the 991 and needed a tire for it and just signed off what they had, and until now only the Pirellis were available in N rating as a matter of fact. But now Michelin have come up with a proper tire with the PS4 Sport, highly recommend it.
--
⇒ Carlos - Porsche 991 Carrera GTS