All of this was a product of corporate leverage and synergies and all of these corporate-sounding words that sound so much better when Jack Donaghy says them. The cynical say that the idea to badge Opels as Saabs happened a few years later with the second-generation 900, which shares a lot of pieces with the Calibra, but in reality they're very different cars. As a Saab, I say the Calibra would've been derided from the start and its reputation ruined that way. Listen to Chris Goffey and his beard go on about its styling and merits when he drove it as the Vauxhall Calibra on old Top Gear.
Detail improvements, such as a new dashboard and a steering-column shift, embellished the Kapitän line in May 1950. Bigger changes were saved for March 1951, to anticipate the opening of the doors of the Frankfurt show on 19 April for an 11-day run. Its earlier fast-back style was modified to a mild notch-back contour, and a new horizontal grille – not the prettiest in Opel history – dominated the frontal view. With a higher compression ratio (still only 6.25:1), engine power was 58 bhp (43 kW; 59 PS) at 3,700 rpm and top speed was 80 mph (130 km/h). Output increased to 60 bhp (45 kW; 61 PS) during the further life of this model, which ended in July 1953.
Opel also produced the first mass-production vehicle in Germany with a self-supporting ("unibody") all-steel body, closely following the 1934 Citroën Traction Avant. This was one of the most important innovations in automotive history. They called the car, launched in 1935, the Olympia. With its small weight and aerodynamics came an improvement in both performance and fuel consumption. Opel received a patent on this technology.
Four cylinder power came from 1.2, 1.4, and 1.6 litre Family 1 petrol engines, as well as an economical 1.5 L turbodiesel engine. Most cars received a five speed manual transmission, although a four speed automatic was also available with certain engines. In the first few years, a four speed manual was also available coupled to the smallest 1.2 litre engine.
Other special jobs were undertaken at the Rüsselsheim factory. One that was too exotic to be typical was the construction of an intercooler for the supercharger of the famous Junkers Jumo aircraft engine. Special methods had to be developed to fabricate this vital assembly from very thin sheets of aluminium. With work like this going on, Germany's enemies naturally took note of the various Opel plants, and starting in August 1944, began attacking them by air. Destruction was heavy at both Rüsselsheim and Brandenburg from the attacks by Allied bombers. Never was the outlook bleaker at Adam Opel AG than in the first months of 1945.
Opel had been transformed and rebuilt before. Beyond the efforts of the company's staff, very little was functioning in the factories and plants. Many of the tools with which they once had worked were gone. The Brandenburg truck plant fell into the Russian zone of a divided postwar Germany. It did not stay there long. All the machinery and equipment – right down to the window frames and bathroom fixtures – were dismantled and shipped to a site near the Ural mountains.
The GSi's engine mapping had been carried out by Opel tuning specialists Irmscher. A model with the 82 PS (60 kW) 1.4 L multi point fuel injected engine, which was otherwise mechanically identical to the GSi, also became available as the Nova SRi in the United Kingdom. In January 1988, a turbocharged version of the Isuzu diesel engine was introduced, with power increased to 67 PS (49 kW).