1991 Porsche 911 Carrera 2 Convertible 2-door 3.6l on 2040-cars

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Porsche would have entered F1 if Audi had blocked its Le Mans program

Go back a few years and you may have heard rumors of Porsche heading into Formula One. That never came to pass - or at least, it hasn't yet - but that doesn't mean that it wasn't close to happening. That's how committed to returning to top-level motorsport competition Porsche has become recently.
Autosport reports that just as Porsche was merging fully into the Volkswagen Group, Zuffenhausen was weighing its options for a factory racing program. Le Mans was its favorite, which makes sense, as it remains far and away the most successful constructor in the history of the famous endurance race. But the strategists at Porsche were worried that its new corporate overlords at Volkswagen wouldn't support two LMP1 programs and would favor Audi, which has positively dominated the modern era of endurance racing, coming second only to Porsche in the number of Le Mans victories it has scored to date.
Porsche's Plan B was reportedly to head into Formula One, although it isn't clear if the German automaker was intent on starting its own team, buying an existing one or merely providing engines to other teams. Porsche fielded its own cars in F1 in the late 1950s and early 60s, and returned as an engine supplier with TAG to power McLaren in the 1980s, powering Niki Lauda and Alain Prost to the World Championship in 1984 and 1985.

Porsche 959 Prototype started it all

While Porsche was unveiling the new Nürburgring-dominating 918 Spyder downstairs in Hall 3 here at the Frankfurt Messe, there was another Porsche supercar quietly and discretely on display upstairs in the same hall. That, of course, was the 959. But not just any 959: this was the original Gruppe B prototype.
The 959 was first developed as a rally car in the early 80s to compete with the likes of the original Audi Sport Quattro S1, Ford RS200 and Lancia Delta S4. But Zuffenhausen soon saw its potential as a production road-going supercar, emerging as a technological marvel to challenge the decidedly linear approach of the Ferrari F40. It still stands as a groundbreaking supercar in its own right, but also lead to the first all-wheel-drive 911 Turbo and set the stage for the Carrera GT and aforementioned 918 Spyder that followed to cap the top of the evolving Porsche range.
This original Gruppe B prototype, which presaged the production 959, packed a 450-horsepower 2.8-liter twin-turbo flat-six into an even sleeker form than the final version that followed. We caught up with it on display as part of a display of 80s German classics, of which this 959 prototype immediately stood out as the pick of the proverbial litter. Check out the hotness in the high-resolution image gallery above.

'Faster. Farther.' dives into the history of Porsche racing tech

No doubt, Porsche has produced some of the best endurance racecars around, such as the turbocharged, slant-nose 935 of the 1970s and the ground-effects-enhanced 956 and 962 of the 1980s. But the company's most famous racecar, its first overall winner at the 24 Hours of Le Mans, was the 917.
The 917 embodied many of Porsche's technological achievements up to that point, such as the company's first 12- and 16-cylinder engines (the flat-16 was never used in competition), fiberglass bodies that implemented early aerodynamic practices and the use of new, exotic materials, such as magnesium and titanium.
The racecar was commissioned by the head of Porsche Motorsports, Ferdinand Piëch, to win overall at the 24 Hours of Le Mans in 1970, after he realized a loophole in the rules that allowed cars to compete with engines up to five liters in the Sport category if they were also production models. Piëch saw opportunity: the top prototype class was restricted to three liters; the production minimum to compete in Sport was 25 cars. And so, with much effort, Porsche assembled 25 "production" 4.5-liter 917s and had them parked in a neat line for the race inspectors to verify their legitimacy. It didn't take long before people realized the new Porsches were much faster than the prototype racers, with a top speed approaching 250 miles per hour.