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The P2 class is actually a grandfathering class, for cars built to the 2018-spec P1 regulations. This means it has the same tire limitations, as well as the forbidden engines list, with only slightly different weight/fuel capacity pairings, as below:
Cars with NA engines:
6.301 cm³ to 7.000 cm³: 900 kg / 100 lt
5.001 cm³ to 6.300 cm³: 880 kg / 100 lt
4.001 cm³ to 5.000 cm³: 800 kg / 100 lt
3.601 cm³ to 4.000 cm³: 750 kg / 100 lt
2.501 cm³ to 3.600 cm³: 730 kg / 100 lt
Up to 2.500 cm³: 680 kg / 100 lt
Cars with forced induction engines:
2.401 cm³ to 4.200 cm³: 900 kg / 100 lt
2.101 cm³ to 2.400 cm³: 780 kg / 100 lt
Up to 2.100 cm³ (more than 2 valves per cylinder): 740 kg / 100 lt
Up to 2.100 cm³ (2 valve per cylinder): 700 kg / 100 lt
Up to 1.350 cm³ (bike engines): 520 kg / 80 lt
As a side linte, the car Tarso Marques built, while originally intended for P2, will race in P1, as P2 accepts only older prototypes.
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