You might first want to read the story of the 1963-1973 model
Porsche 911/912 G-model (1973-1989)
Date and place of world premiere: September 12, 1973 IAA Frankfurt
|Normally aspirated street models||912 2.0 66 kW|
|2.7 110 kW||Euro||Japan|
|S & Carrera 2.7 California 118 kW||2.7 Euro 121 kW||SC 3.0 Euro 138 kW||SC 3.0 Euro 150 kW incl. MY1982 Ferry Porsche Edition||Carrera 3.2 Euro 170 kW||incl. Club Sport|
|Carrera 2.7 USA 129 kW||Carrera 2.7 USA 121 kW||S 2.7 Japan 121 kW||SC 3.0 132 kW||USA incl. MY1980 Weissach Edition||Carrera 3.2 USA Japan 152 kW||Carrera 3.2 KAT 160 kW incl. Club Sport|
|S 2.7 USA 121 kW||SC 3.1 154 kW powerkit|
|S 2.7 Euro 129 kW||Carrera 3.0 147 kW|
|Carrera 2.7 Euro 154 kW|
|Carrera RS 3.0 172 kW|
charged street models
|Turbo 3.0 Euro 191 kW||Turbo 3.3 Euro 221 kW|
|Turbo 3.3 with powerkit 243 kW|
|Turbo Carrera 3.0 USA 180 kW||Turbo 3.3 USA 195 kW||Turbo 3.3 USA 210 kW|
|Turbo 3.0 Japan 180 kW||Turbo 3.3 Japan 195 kW|
|Carrera RSR Turbo 2.1 338 kW||SC Safari 3.0 184 kW||SC San Remo 3.0 206 kW||SC RS 3.0 188 kW|
|Carrera RSR 3.0 246 kW||3.2 4x4 165 kW|
|Sportomatic 4-speed||Sportomatic 3-speed|
|Flachbau Coupé||Flachbau Coupé with pop-up headlights|
|Turbo-look Coupé / Cabriolet|
|Turbo Targa / Cabriolet|
|Flachbau Targa / Cabriolet|
|10 digit chassis number||17 digit VIN|
Starting with the model year 1968, Porsche internally assigned a letter to each model year - MY1968 was “A”, MY1969 was “B” and so on. Model year 1974 cars were therefore called the G-models. Although “G” stands for 1974, the cars until MY1989 were all called G-models to distinct them from the first generation 911’s, which are sometimes referred to as F-models (“F”=MY1973).
The 911 G-model was presented to the press at the IAA Frankfurt on September 12, 1973 and a day later to the public. The main exterior differences were the impact bumpers (developed for USA, but used on cars for all markets), the shorter bonnet, the front blinkers that moved from the fenders to the bumper and the rear reflective panel with PORSCHE-lettering that would become a trademark item. The main interior feature were the new seats with integrated headrests. These seats would be fitted for over two decades with minor modifications in all Porsche models except 928.
The standard engine was now 2.7-litres in comparison to 2.4 in the earlier model. 2.7 - 3.0-litre engines had been used earlier, but were reserved for motorsport models. The 154 kW Bosch/Kugelfischer-injected Carrera-engine used in MY1973 911 Carrera RS 2.7 was kept in production, but used only on the 911 Carrera models for European markets. The base model had 110 kW for all the markets and the European market “S” or Sports version had 129 kW. The importer for USA, Porsche+Audi division of Volkswagen of America, sold the European “S” in USA as Carrera. What a chutzpah against the US Porsche customers! The next model year (MY1975), the power of the US-model Carrera was reduced further and now the European “S” was more powerful than the US Carrera. This double-nonsense luckily happened only on MY1975. The 110 kW base version was sold in USA only for the first model year (MY1974) and kept in production for Europe for MY1975 and for Japan for MY1976. In MY1976 the base model in Europe had 121 KW. The same car was sold in Japan as “S” as the 110 kW model was still sold in Japan. The 121 kW version was sold as “S”, too, in USA, although is was the base model on that market.
Shown at the 1973 Frankfurt Motor Show was also the prototype of the 911 Turbo. The show car was beautiful, without the impact bumpers. The car shown was much closer to the MY1974 911 Carrera RS 3.0, than the future “Turbo”, but for the exhibition it was labeled “911 Turbo”. The car had a new rear spoiler, which would soon be called the “whaletail”. The whaletail on the 1973 IAA car was very wide and was only used on the MY1974 911 Carrera RSR 3.0 racing car. The production 911’s got a similar rear wing, but not that wide. The narrower whaletail was used on many production 911’s starting with the MY1975 911 Turbo until MY1989 911 Carrera 3.2 and in altered design also on 911 964 Turbo S 3.3 and 911 993 Carrera RS.
Following the famous 1973 F-model 911 Carrera RS 2.7, Porsche built its successor based on the G-model and it was called the 911 Carrera RS 3.0. This road legal racing car was first shown at the Geneva motor show in March 1974. With its 172 kW engine, it was the most powerful series production street-legal Porsche made so far.
For the 1974 racing season 911 Carrera RSR 3.0 (246 kW) and RSR Turbo 2.1 (338+ kW) were created - the 3.0L for the customer teams and the 2.1 turbo for Porsche’s own team. The reason to produce 911-based cars for racing was marketing. But, any 911-based car would be heavier than racing prototypes of other teams, so Porsche needed more power. Porsche’s engineers knew that turbocharging might help. The coefficient for the turbocharged cars was 1.4, so in order to fit into the 3-litre class, the engine displacement was limited to 2.1-litres. The 911 Carrera RSR Turbo 2.1 developed 460-500 PS (338-368 kW) peak power, but as the engine was small, the turbo lag was big and it wasn’t as easy to drive out of the corners as it was with the 3-litre normally aspirated car. Weight reduction measures included plastic hoods, fender flares and doors (each weighing 2.25 kg/5 lb) and the safety cage was made of (not so safe) aluminium. The fuel tank was located in the co-driver’s position.
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Article © James Herne / Stuttcars.com