Official photos: 2019 July 6 Premiere: 2019 July 6, Goodwood Festival of Speed, England First race: 2019 September 1, FIA WEC race at Silverstone, England
Engine: 4.2 B6 normally aspirated, 378 kW (depends on air restrictor) Gearbox: Sequential, 6-speed with 3-disc carbon clutch, magnesium casing Weight: 1245 kg/2745 lb by regulations
In August 2018, the first prototype was rolled out to the test track in Weissach. In March 2019, a 30 hour and 6000+ km (3700+ miles) test was carried out at the Le Castellet track. The homologation was received on July 1, 2019 and the world premiere took place on July 6, 2019 at the Goodwood Festival of Speed in Great Britain.
Porsche Motorsport said 95% of the car was new. The only components that were kept unchanged from the predecessor were the headlights, brake system, clutch, driver’s seat and parts of the suspension.
This was the fourth version of the 991 RSR - the first two came with the rear engine, then the first mid-engine version was launched (all 4.0-litre) and finally the mid-engined RSR 4.2 with the largest 911 engine ever made. The increase in the engine capacity is a question mark as on production models the capacities are decreased and turbochargers are used. The 991 RSR 4.2 didn't have anything in common with the production cars anymore, so how could the marketing department or the production cars benefit from Porsche's GT racing programme? It isn't less strange that the car was still based on the 991, while the 992 was long in production. In comparison to the predecessor, there's no change in terms of power-to-weight ratio as the power and the weight are the same as before (regulated by FIA).
Porsche factory team will initially use the 911 RSR 4.2 at the FIA World Endurance Championship races and from 2020 also at the IMSA races. For customer teams, the 991 RSR 4.2 will become available from the 2020/2021 FIA WEC season. Considering the 992-generation 911 was premiered already in 2018, the 991 business in 2019 and 2020 is a bit confusing - but, a 911 is a 911!