The 911SC continues unchanged, but with the 3.0-liter now uniform across the U.S., there are no differences between the California car and those sold elsewhere. Thanks to an air-to-air intercooler, the Turbo moves further up the insanity ladder, producing an epic 265 horsepower and 290 lb-ft turbo lag remains an issue.ДЎ980: Those pesky emissions rules catch back up to Porsche, necessitating the Turbo take a vacation from the U.S.

The 911SC-equivalent to the previous yearвЂ™s 911S-makes 180 horsepower and 187 lb-ft of torque. It is rendered obsolete by the fuel-injection systemвЂ™s new vacuum-operated warm-up regulator.ДЎ978: A new, aluminum-block 3.0-liter flat-six replaces the 2.7-liter magnesium-cased unit. The hand throttle between the 911вЂ™s front seats (essentially an idle-speed adjuster to ease cold starting) disappears. A KKK turbocharger fitted to the 2.7-liter flat-six boosts output to a healthy 234 horsepower and 246 lb-ft of torque, a huge improvement over the 911SвЂ™s carry-over engine. The 911S and Carrera produce a meager 157 horsepower and 166 lb-ft-in California the horsepower figure is even lower.ДЎ976: Enthusiasts welcome the Turbo to the 911 family. The 911S and Carrera pack a more-palatable 167 horsepower and 168 lb-ft.ДЎ975: More emissions restrictions push output ratings down further, and the base 911 goes on hiatus. Output inches up from its emissions-choked backpedal in 1973, but even with more displacement, the 911 makes just 143 horsepower and 168 lb-ft of torque. Regular 911 models see an on-paper reduction in output, with no mechanical changes save for the fitment of Bosch K-Jetronic electronic fuel injection to the 911T.ДЎ974: All 911s get the RS 2.7вЂ™s 2.7-liter flat-six with K-Jetronic fuel injection, and the 911T and 911E model designations make way for 911, 911S, and Carrera. It utilizes a racing-spec 2.7-liter flat-six, but as a result of horsepower ratings switching from SAE gross to SAE net, the RS officially makes вЂњjustвЂќ 200 horsepower and 188 lb-ft of torque. Output in the 911E swells to 185 horsepower and 174 lb-ft, while the 911S delivers 210 horsepower and 181 lb-ft.ДЎ973: Porsche introduces the Carrera RS 2.7, a homologation special that isnвЂ™t officially imported to the U.S. All 911s are now fuel-injected, netting the 911T 157 horsepower and 166 lb-ft of torque. Output rises to 142 horsepower and 148 lb-ft of torque in the 911T, 175 horsepower and 160 lb-ft in the 911E, and 200 ponies and 164 lb-ft in the 911S.ДЎ972: North American emissions requirements again force change, this time to a lower compression ratio Porsche ups the flat-sixвЂ™s displacement to 2.4 liters to make up for the lost power.

The 911T continues to use Weber carburetors.ДЎ970: A new 2.2-liter flat-six is dropped into the 911T, 911E, and 911S the block is again magnesium and the basic aluminum head design is shared across the range. All 911 engines switch from aluminum blocks to magnesium, and power rises to 125 ponies and 131 lb-ft of torque on the 911T, 158 horsepower and 145 lb-ft on the 911E, and 190 horsepower and 152 lb-ft on the 911S. market thanks to stricter emissions standards the base model is rechristened 911L and gets no engine changes.ДЎ969: Porsche brings back the 911S, now with an emissions-compliant Bosch fuel-injection setup shared with the mid-level 911E.

A higher compression ratio, as well as changes to spark and cam timing and the carburetors, contribute to the added power.ДЎ968: The 911S is pulled from the U.S. 1964: The 911 enters production with a 2.0-liter, air-cooled SOHC flat-six making 148 horsepower and 140 lb-ft of torque.ДЎ967: Porsche adds the sportier 911S to the range with a modified 2.0-liter making 180 horsepower and 144 lb-ft of torque.

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