Quote:
Originally Posted by ILC32
There is no evidence the tires are not approved for the street.
If the tires are available as an option, then the test is fair. To use a "benchmark" tire for all cars is an interesting idea, but not practical for many reasons, including continually advancing technology.
If to make it fair, the Porsche has to use the exact same tires as the M even if the tires are not available from Porsche, then what else should be the same for comparison purposes to ensure fairness? Do both cars have to use the same brake pads also? The M cannot be obtained with ceramic brakes. To be fair, should the M get Porsche's brakes while the Porsche gets the M's tires?
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All things equal, tyres is the single biggest factor affecting performance especially on the track. A P-Zero Corsa has a much higher dry grip factor compared to P-Zero Rosso, is able to sustain its grip level at a higher temperature and maintain it thread block without disintegrating on continuous abuse (hard cornering). The Corsa also has thinner thread depth to prevent too much heat from building up at high speed runs. I would think a semi-slick like the Corsa is a good 5-7s faster over a single dry lap at the Ring compared to Rosso. But on wet surfaces, its grip threshold is much lower and you'll be slipping and sliding if you push it.
Lets not forget the C2S is 65bhp down on the M3
