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Contact: G.P. van 't Hoff
Carrera RS History

Origin: Porsche's famous 911 2.7 Carrera RS was evolved from the production 911 S 2.4. The sales department were conscientious objectors to the idea of the Carrera RS. Still the Board agreed to build 500 cars, but decreed that every eligible executive in the company change his personal car to a Carrera RS to help shift the  cars! But none of this was really necessary, for the sales department had totally misjudged their buying public.

Paris 1972: The 911 2.7 Carrera RS made its public debut at the 1972 Paris Salon and all 500 cars were sold within a week. The decision was taken to build a second batch of 500, and when these were completed in April 1973, Porsche were in the happy position of being able to apply for Group Three homologation papers which required 1,000 cars to be made and sold.

Engine:  The modified 2.7-litre engine with its mechanical fuel injection and radical valve timing that gave it 210bhp at 6,300rpm and 188 lb ft of torque at 5,100rpm, combined with the weight reduction to 977 kg (2,150 lb), produced a power-to-weight ratio of 10.2 lb/bhp or 218.8 bhp/ton for the RSL (Lightweight). The shedding of over 200 lb from the weight of a production 911 S came about through some very careful removal of material from critical areas.

Body: The most drastic technical change from 'S' to 'RS' was through the use of 0.7mm rather than at least 1 mm thick steel in the body panels. The engine cover and ducktail rear spoiler were moulded from glassfibre and all normal glass was replaced by lightweight Glaverbel windows. The exterior underseal and most of the interior soundproofing material was removed along with things like the passenger sun visor, glovebox, clock and the rear seats. The front ones were replaced with lighter competition items, and the door trims were junked in favour of simple vinyl panels and the door pulls, manual window winders and the strap operated latch came from another lightweight rear-engined car - the Fiat 500! Even a change of dampers helped. Bilsteins weighed a massive 7.7il less than Konis and were thus adopted.

The factory designation code for the RSL was M471. But customer demand for a slightly more civilised racer led to M472, the RST or Touring. This had the 911S trim and was mechanically identical to the RSL save for using two 36 amp/hr 6-Volt batteries, one either side of the spare wheel instead of one 12-volt unit on the left, the rear bumper was made from steel.