Interesting difference in Air Temperature.... 15C for the McLaren and 7C for the Gt2..... quite chilly for Sticky Tires....

 

 

7C is worse than 15C as Cup2s will loose a lot of grip not reaching optimal temps, the gains related to engine power are minimal, anyway gt2rs runs water injection so no need 7C outside temps

 

 

7C is the minimum temperature for regular street tires, lower than that you should use winter tires or all weather.
Maybe 7C will work still ok for Cup2 but for sure not optimal, I am sure they were designed for at least 20C ambient temps, take a look at slicks temp rating, works the same... a tire can not work optimal at 20C ambient AND 7C ambient.

Now, regarding water injection: IAT is killing power after some time, and water keeps IATs down all the time, on top gives more knock resistance just in case anything wrong can happen, water makes the GT2RS to run almost the same even if 25C ambient or 7C ambient, so the difference btw 7C and 15C is irrelevant to me when running WMI or just WI

 

Showing this as a "comparison" test is pretty disingenuous they should be tested on the same day same conditions. I find it hard to believe that the GT2RS is so much worse in the braking tests, yes it's 75kg heavier but it has much wider front tyres and these Porsche brakes are the best around, I suspect the tyres weren't warm enough for the braking tests but I have to agree that with a 1.55G lateral acceleration they seemed to be performing on the lap tests and of course in 7 deg C the engine will be running optimally.

 

Given the choice between PCCBs and McLaren Ceramics, I would go McLaren. Only thing that takes a little bit of getting used to is the pedal feel. I've owned about 7 911s with PCCBs and have another 2 coming so know the brakes pretty well.

 

I'm interested why you say that, how do you find the Mclaren's better ?

I much prefer the feel of the Porsche's, I'm not talking about ultimate stopping ability as for that they both seem as good as each other but the way the Mclaren's need constant pressure otherwise they creep forward is a little disconcerting I feel I will probably creep into someones rear end at some point !

 

1.55g is a lot of lateral acceleration for any semislick including cup2s, but remember Nring is a "3D" track with a lot of on-camber turns that will help and sustain higher Gs, nevertheless I do agree that tire seems to perform very well even @7C, I wonder now if they can reach even higher Gs in warmer weather

 

Do you realise that the GT2RS does not use water injection ?

What you go on to describe may be accurate for water/meth injection but the GT2RS uses a water sprayer/mister squirting a spray over the front of the intercooler core, for sure it will help reduce the IATs and as Preuninger said in worked even better in practice than their modelled expectations but it is still nothing like as effective as injecting into the intake, so the difference between 15 and 7C can be very important if the engine is already near its thermal IAT limits in producing its 700PS

 

 

 

 

Seb's first lap in the GT2RS

 

Interesting!!!!!
The cars giving passing signals are indicating the direction THEY will remain when being passed, which is OPPOSITE to the Directions
being given to us at HPDE's here - which request we indicate the direction we want the car to pass us on. This is NOT intuitive!!!

The German system shown seems to me to make a lot more sense since it is far more intuitive indicating the direction in which the
car being passed will go - as the driver is used to doing in normal road driving.