Porsche 911 G-Series (2nd Generation) Research Hub (1974 - 1989)
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The Porsche 911 G model was a true perennial and was built for a full 17 years. During this time, engines were built with 2.7, 3.0 and 3.2 liters. The narrow G-model (from 1974 to 1977) over the 911 SC, the Carrera 3.0 to the Carrera 3.2 gave it a large variety of variants, colors and equipment. The G-Body saw the introduction of impact bumpers to conform with low speed protection requirements of U.S. law, these bumpers being so successfully integrated into the design that they remained unchanged for 15 years. In 1974 the engine size was increased to 2,687 cc, giving an increase in torque. The use of K-Jetronic CIS Bosch fuel injection in two of the three models in the line up - the 911 and 911S models, retaining the narrow rear wings of the old 2.4, now had a detuned version of the RS engine producing 150 and 175 bhp (110 and 129 kW) respectively.
Ten years after the car made its premiere, the Porsche engineers gave the 911 a comprehensive makeover. Known as the 'G-model', the new generation 911 was built from 1973 to 1989 – a longer period than any other. A particular feature of this evergreen was the striking bellows-style bumpers – an innovation created in order to comply with the latest US crash test requirements. Three-point safety belts fitted as standard and seats with integrated headrests also provided increased occupant safety. A further milestone in the car's history came in 1974, when Porsche brought out the first 911 Turbo with a three-litre engine, 260 hp and a striking rear spoiler. With its unique combination of luxury and performance the 'Turbo' became a synonym for the Porsche brand. In 1977 came the next performance level: the 911 Turbo 3.3 was given a charge air cooler and at 300 hp was the highest performance car of its class. On the naturally aspirated side the 911 Carrera re placed the SC in 1983 and, having an engine capacity of 3.2 litres and 231 hp, became a much loved collector's piece. Lovers of fresh air were able to buy this 911 as a convertible from 1982. In launching the 911 Carrera Speedster in 1989, Porsche was building on a legend.
Engineers searching for the "ideal charge" – optimum combustion of the air-fuel mixture – is almost as old as the combustion engine itself. The technicians aim to get as much air as possible into the cylinders so that, when it is compressed and mixed with fuel, it can create a high operating pressure and therefore high output by means of combustion. The 911 Turbo, presented in 1973, was a forward-looking study as its 3-litre turbo engine boasted charge pressure control on the exhaust side which had previously been thoroughly tested in the motor racing sector. With the 911 Turbo, which was ready for series production in 1974, Porsche was the first car manufacturer to successfully adapt the turbocharger to the various driving states. Instead of the conventional intake-side control, the company developed exhaust-side charge pressure control. This prevented unwanted excess pressure during partial load or overrun by guiding excess exhaust gases via a bypass instead of through the exhaust gas turbine. When charge pressure was needed again during an acceleration phase, the bypass valve closed and the turbine could work to its full capacity in the exhaust stream.
In 1975, Porsche responded to the issue of corrosion with emphatic success. The 911 was the first series production car to be given a body which was galvanized on both sides – allowing Porsche to offer a six-year corrosion warranty which was extended to seven years for the 1981 model year and then later to as much as ten years. The treated body-in-white not only improved the service life but also vehicle safety as the process preserved the overall rigidity and the crash safety characteristics of the body, despite vehicle aging. It plays a part in the reputation of the 911 as being an extremely durable vehicle – two thirds of all the 911 cars ever built are still licensed for road use today. Extensive tests were carried out before the body was launched for series production. This included trials with stainless steel as the body material – three shiny silver prototypes were made from this material, one of which can be seen today at the Deutsches Museum in Munich. However, the engineers decided not to use stainless steel but to galvanize the body-in-white as this was easier to produce. Driving the prototypes through a bath of salty water to test the resistance to corrosion is a legendary part of the test course in Weissach.