The outgoing Porsche 911 GT3 Cup (Type 991 II) car fleet was replaced by the latest generation of Porsche 911 GT3 Cup (Type 992) and also all-new Porsche MA2.75 engines for all Porsche Supercup entrants from 2021 season onwards.[1][2] The engine power output of all Porsche Supercup entrants was increased slightly from 485 to 510bhp (362 to 380kW; 492 to 517PS).
ExxonMobil would become the official major fuel retailer and convenience store partner and supplier of the series starting from 2021 season through Esso brand as a part of Porsche and ExxonMobil partnership since 1996 although in 1996 until 2020 the series was utilized the Panta NS 102 RON unleaded petrol fuel. All Porsche Supercup cars utilized Esso Synergy Renewable Racing Fuel with full-blend of Ethanol.[3]
The 2021 Porsche Mobil 1 Supercup provisional calendar was released on 28 November 2020.[6] On 14 May 2021, due to the changes in the Formula One calendar, the Porsche Supercup calendar was also adjusted, with the round at Paul Ricard on 25–27 June being replaced by a second round at the Red Bull Ring.[7] Later on 28 June 2021 it was announced that the round at Silverstone would be cancelled and an additional race would be held at Monza.[8]
In order for full points to be awarded, the race winner must complete at least 50% of the scheduled race distance. Half points are awarded if the race winner completes less than 50% of the race distance. In the event of a tie at the conclusion of the championship, a count-back system is used as a tie-breaker, with a driver's/constructor's best result used to decide the standings.[12]
Guest drivers are ineligible to score points. If a guest driver finishes in first position, the second placed finisher will receive 25 points. The same goes for every other points scoring position. So if three guest drivers end up placed fourth, fifth and sixth, the seventh placed finisher will receive fourteen points and so forth - until the eighteenth placed finisher receives the final point.[12]