Tre,
2.8 RSR, ducktail, MFI twin plugs,
QV500.COM The 2.8 Carrera RSR was Porsche’s Group 4 competition car for the 1973 season. Based on the fabulous 2.7-litre RS homologation specials covered in Part 3, the bigger engined RSR's featured a number of important upgrades for track use. Weighing in at the 900kg class minimum for Group 4 cars, the RSR's suspension geometry had been altered to accommodate special coil springs with fully adjustable dampers, even wider Fuchs alloy wheels and new tyres. Titanium hubs were also used whilst twin circuit brakes with ventilated and perforated discs were sourced from the magical 917 sports prototype. Displacement was now 2806cc thanks to a bore and stroke of 92 x 70.4mm respectively. New pistons, four bearing racing cams and twin plug cylinder heads were sourced from the 2.5 ST. Output was 308bhp at 8000rpm 911ST. No ducktail, MFI twin plugs, Different flares and fenders than RSR.
WIKIPEDIA (the production run for the
ST only lasted from 1970 to 1971). The cars were available with engines of either 2466 cc or 2492 cc, producing 270 PS (199 kW; 266 hp) at 8000 rpm. Weight was down to 960 kg (2166 lb). The cars had success at the Daytona 6 Hours, the
Sebring 12 Hours, the
1000 km Nürburgring and the
Targa Florio.