Are you sure that CAR was not fast car for 20"29 @ 269 with 13 degrees C when the QR press car 21"12 @ 255 then corrected dynos (as your method but now not relevant) and the owner explain for fast car? No you can't, is the owner saying or corrections is not the best method?
Why that case of corrected dyno sould not be relevant compare to other Gt2 then Auto's corrected dyno was relevant for the SA GT-R car?
Are you sure that only Ferrari send fast press cars? No you can't, we are talking about methods, or it is just the 360 example a problem? Then I agree is fast.
If it is just one could be a case, if other Ferraris tested are fast then they all factories send fast cars.
I'm not aware of CAR having tested a GT2 to that speed. Do you have the article? Post it up.
Owner saying without having dyno- or performance-tested is not proof of 600 hp.
Regarding corrections of dynos, it is stated in SAE standard that turbocharged cars are not to be adjusted for atmospheric conditions. This implies that in hot conditions, a car with iterative closed-loop turbo system like the GT2 will automatically compensate boost and timing to a prescribed minimum. What this does not imply is that this minimum must be maintained even when cold, dense air is being rammed into the intake.
The point of the SA GT-R was that it was not faster than the Auto dyno-tested GT-R. If one car is dynoed at 489 PS, we do not
have to conclude the other
must be 520+ PS. What is the precedence? You have no dyno, you have no performance of a 520 PS GT-R. Where does the guess come from, if not pure bias against Nissan and suspicion of cheating (as Auto have displayed by dyno'ing that GT-R).
In the case of Ferrari, I have yet to see a customer 360M, F430, or 599 matching or beating a factory Ferrrari press car in acceleration. We see the 599 beating the SLR in 100-200 by more than 0.5s in AMuS, yet in a test between customer cars, the SLR is visibly, comfortably faster. You have already explained why: ECU tuning behind octane used.
Nissan sends cars that are noticeably faster than customer cars? Where? Nissan has sent GT-Rs that trap at 111 and 115 mph timed by Vbox. Customer cars have been trapping 119-122,
averaged over the final 66'.
We have already one customer 2011 GT-R that has pretty much matched all press GT-Rs so far. Plenty of customer ZR1s have matched/beaten magazine times too.
Please, try again:
"Do you see Porsche complaining about customer cars being used? Intevening with customes? Do you see them sending 2 cars for different disciplines? Do you see them calling ahead of time to set up a car before a comparo takes place? You are still quite certain they are just like Ferrari?"
To say Ferrari are not saints is not the same as recognizing and acknowledging that there is a fundamental difference to what they're doing vs what other companies do in 3rd party, independent testing of what are supposed to be stock production cars (ie., no ECU tuning behind fuels self-provided, no changing out wheel sizes to reduce understeer, etc). You still cannot see the difference? If not, then we are done here.