Porsche 911 Turbo America Roadster

Porsche’s initial work with turbocharging their racing cars during the late-1960s and early-1970s, led to the development of a turbocharged street version of the 911. While initially required to comply with the FIA’s homologation regulations for GT-class racing, development continued unabated when the rules changed. The new car was repositioned as a fully-equipped road model to lead the 911 series and compete directly with the costlier and more exotic “supercars” from Ferrari and Lamborghini.

Ernst Fuhrmann led development, adapting the technology developed for the all-conquering 917/30 Can-Am car to the 3.0-liter flat-six from the Carrera RS 3.0. As racing fans will immediately recognize, the 917/30 remains infamous today as “the car that killed Can-Am,” because of its dominating, opposition-crushing performance. Suspension refinements, larger brakes, and a strengthened four-speed manual gearbox rounded out the package. A functional “whale-tail” rear spoiler increased cooling airflow to the rear-mounted engine and provided additional rear downforce. Wider rear wheels with upgraded tires resided within flared wheel wells, increasing grip and stability at speed.

Simply known as the “Turbo,” the new vehicle was released in the spring of 1975, with export to the U.S. commencing in 1976. In 1978, power output reached 300 hp (DIN), with a displacement increase to 3.3-liters and the addition of an air-to-air intercooler. Porsche’s continuous development included slight revisions to the rear spoiler to accommodate the intercooler. Braking was significantly upgraded as well. Porsche’s careful and relentless development program also ensured that the 930 was a sound base for racing vehicles and led to the highly successful 934 and 935 racing cars. The 930 proved fast but demanding; however, skilled drivers quickly learned how to drive the 930 properly and to drive the car beyond the limits of most other sports cars.

The 964 generation of 911s, introduced in the late 1980s, was no exception. Retaining Porsche’s highly developed air-cooled flat “six,” the Turbo delivered nearly unbelievable performance statistics. Although the rear-engine setup and traditional design formula remained unchanged, Stuttgart had produced a supercar with 320 brake horsepower and acceleration from rest to 60 mph in just 4.9 seconds, in showroom-stock tune.

This car was auctioned off by RM Auctions in June of 2012 at the Dingman Collection, Hampton, New Hampshire.

Turbocharged and intercooled SOHC flat six-cylinder engine, fuel injection, five-speed manual gearbox, four-wheel independent suspension, and hydraulic four-wheel disc brakes. Wheelbase: 89.4"

Source: RM Auctions

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