Porsche 911 and 930 Turbo Service


For those with gasoline in their veins, the word “turbo” conjures up a 911. Porsche did not invent turbocharging but they get a lot of credit for popularizing it in the modern era, both on the track and on the street.

The 911 Turbo debuted as a concept car at the Frankfurt show in October 1973 as an RSR 3.0-body 911 in silver with “Turbo” emblazoned on its flanks. Porsche reported that its flat six would displace 2.7 liters, making 280 hp, and push the 911 to 160 mph.

Porsche ultimately created a 3.0-liter engine that produced 234 hp and 246 lb-ft in the US. Porsche designed a new 4-speed Type 930 gearbox derived from the five-speed Type 915 introduced in 1972.

The 930’s suspension was similar to the 3.0 liter Carrera RS/RSR, with beefed-up anti-roll roll bars and torsion bars as well as new, stronger trailing arms. Wheels remained 15 inches in diameter at seven and eight inches wide with 185/70R15 and 215/60R15 tires.

In 1978, Porsche introduced all of the alterations in the J-Body series 911 for 1977 and added an intercooler to lower inlet air temperature and get a more condensed, more powerful air charge. Displacement was increased from 2993 to 3299 cc. While maximum boost remained set at 0.8 bar (11 psi), boost onset dropped from a typical 4000 rpm to 3000 rpm. Horsepower moved up to 300 hp in Euro trim, or 265 hp in U.S. specification due to emissions regulations.

Although no faster than the old 3.0-liter, the 3.3-liter engine was a significant upgrade in technology, and greatly increased low-end driveability. Porsche announced that it would drop the 930 in the U.S. after 1979 due to more stringent U.S. emissions regulations, but by 1985, however, the 930 was on its way back to the States with newly designed catalytic converters, and delivering 282 horsepower in U.S. trim. The last meaningful instance of the 930 product improvement came in 1989, when Porsche adapted the Getrag-built, five-speed G50 gearbox for the Turbo – a unit pioneered by Alois Ruf for his 911 specials.

If you’re the proud owner of a 930 Turbo or any air cooled 911, please see us for:

  • Complete Engine Service and Upgrades
  • Suspension Tuning and Upgrades
  • Transmission Rebuilding and Upgrades
The engine room at Morton Competition North

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