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Southern California Porsche dealer Johnny von Neumann knew what his customers wanted, and a Targa top Targa 911 wasn’t it. With Porsche’s approval, he hired designer Nuccio Bertone to create a one-off 1966 Porsche 911 Spyder, in hopes of launching low-volume production. Just one example was constructed.  The engine incorporated a vertically-mounted cooling fan, a 9.1:1 compression ratio and two triple-choke 40PI Solex carburettors. Peak output was 130bhp at 6100rpm and 174lb-ft at 4200rpm. Transmission was via a Type 901 five-speed gearbox and single-plate clutch.
Based on the 911S, the 911 R was produced by Porsche to compete in the FIA’s GT 2.0 category. To make it competitive, the 911R was powered by a flat-six engine, Type 901/22 from the Porsche 906, capable of 210 hp. It went on a diet too, with weight savings coming from everywhere, getting the 911 R down to just 1,800 pounds dry. Four prototypes were constructed after which Porsche had coachbuilder Karl Baur build another 20 customer cars. In the end, because of the modifications to the 911R, the FIA refused to homologate the car.
In 1966 the beefier 160hp 911S was introduced as the first variation of the 911. The "S" which stood for "Super" boasted performance upgrades and modifications that included larger valves, a higher compression ratio, better porting and larger carburetor jets. Along with the mechanical tweaks, the 911S also received chassis upgrades in the form of a rear anti-roll bar, Koni shocks, distinctive 5-spoke Fuchs alloy wheels and ventilated disc brakes on all four corners to replace the solid discs.
The Porsche 911T continued as the entry level 911 for the 1970 and 1971 model years, sitting below the 2.2L 911 E and the 2.2 L 911 S. The 911 T featured all the upgrades that came with C-Series production updates including longer wheelbase and Fuchs alloy wheels. During its production years it was available as both a Coupe or Targa bodystyle. As with the E and S variants, Porsche would upgrade the 911T to a larger 2.2 liter engine.
Put most simply, a 912 is essentially a 911-style body mated with a 356-derived 4-cylinder engine. The 356 was Porsche’s first mass-marketed sports car. The Porsche 911 is the most successful sports car of all time. the new 912 came equipped with 90HP motor was a slightly detuned version of the 95HP motor that had powered its predecessor, the 356SC. However, despite this reduction of power, and despite the 912 being a heavier car, it was actually faster than the 356SC thanks to more streamlined aerodynamics and a more advanced suspension system.
Along with all the C-series improvements to the 911 line, the 1970 Porsche 911 S was upgraded to include a 180 bhp version flat-6. This further improved the performance credentials of the model which already had Fuchs light alloy wheels and bigger brakes. Specific to the S model's engine was a re-profiled camshaft, larger valves, better porting, higher compression and larger jets for the Weber carburetors. This resulted in 30 more horsepower for a total 180 horsepower.
Of all the 1580 Carrera RS 2.7s, only 200 were made were ordered with this lightweight ‘Sports’ trim which made the car more responsive and purposeful. In many ways these few cars were the ultimate road-going Porsche of the 1970s. Known as the Sports, Lightweight or even the M471 option code, these cars had improved the power-to-weight ratio. Reports of 75kg were stripped from the standard model by fitting lightweight body panels and lightweight glass.
Revealed at the 1972 Paris Auto Show, the Carrera 2.7 RS was a special model used to homologate the 911 in Group 4 racing. Developed from the 911S, the 2.7 was more potent in almost every area. Compared to the standard Carrera, the 2.7 RS featured a larger engine, wider flares to accommodate the Fuchs alloy wheels, stiffened suspension, larger brakes and a ducktail rear spoiler. The Touring outsold the Lightweight, with a total of 1380 units built (the Lightweight had only 200 units).
Porsche developed the S/T, of which 33 were built in 1970 and 1971, taking full advantage of new FIA rules allowing a two-inch wider track. Accordingly, wheel arches were widened to accommodate seven-inch front and nine-inch rear wheels. Weight reduction was even more radical, including thinner-gauge steel for the roof and floorpans. Heating ducts, seat slide supports, the glove-box lid, ashtray, sun visors and rear torsion-bar covers were deleted.
The Porsche 911 E was designed to fall nicely between the 911 T touring model and the top of range high-performance 911S. The Porsche 911 T would continue for its second year in Europe, and newly introduced into the United States market, as the entry level offering for the 911, sitting below the 1969 911E and the 1969 911S. The 1969 911E was powered by engine Type 901/09 (Type 901/11 with Sportomatic) featuring mechanical fuel injection (MFI). The 2.0 L Aircooled Flat 6 was good for 140 bhp at 6500 rpm.
Porsche 911 Carrera RSR 2.8
Introduced in 1973, the RSR was a factory-built racing car based on the 911 chassis. The Porsche 911 Carrera RSR 2.8 was the first 911 to ever wear the RSR badge. Homologated for racing by the iconic 1973 Porsche 911 Carrera RS, the RSR’s racing career got off to the perfect start thanks to Brumos Racing’s overall triumph in the 1973 24 Hours of Daytona, while a factory car won the latest ever Targa Florio road race. For the privateer in the mid-1970s who wanted to go sports car racing this was the chosen weapon.
The Porsche 911E continued as the midrange 911 model for 1972 and 1973, fitting between the contemporaneous 2.4L 911T and the 2.4L 911S. As with the T and S variants, Porsche would upgrade the 911E to a new, larger 2,341 cc (2.3 L) engine, commonly known as the "2.4 L" engines. The 911E version, designated 911/52 was rated at 165 hp (it was designated 911/62 with Sportomatic). With the power and torque increase, the 2.4-liter cars also got the newer and stronger transmission.
The Porsche 911L (Lux) was introduced in model year 1968 in both Europe and the United States in coupe and targa variants. Approximately 1,610 samples were produced in total, of which 1,169 were coupes, and 575 were Targas. For the 1969 model year, the 911L would cease to exist, paving the way for a new mid-tier offering in Europe and the US, the 1969 911E, and for the higher-end 1969 911S in North America.