Porsche 911 Turbo Coupe
Whether Coupe or Cabriolet, the 2004 Porsche 911 Turbo draws its power and its name from its 3.6-liter horizontally opposed “boxer” engine, which provides 415 horsepower (SAE) and 415 lb.-ft. of torque.
But, for 911 Turbo Coupe drivers who want even more power under their control, an optional factory-installed X50 engine enhancement performance package boosts the turbochargers’ pressure to generate 444 horsepower (SAE) and 457 lb.-ft. of torque.
The 911 Turbo engine is based directly on the 3.6-liter engine from the GT1 racecar that won the 24 Hours of Le Mans in 1998. (The engine is not a turbocharged version of the 3.6-liter unit used in the 2004 911 Carrera models.) To accommodate the high boost pressure produced by its dual turbochargers, the engine features a 9.4-to-1-compression ratio, compared to 11.3-to-1 for the 911 Carrera models.
The 911 Turbo offers a choice between a precise-shifting standard six-speed manual transmission and the optional Tiptronic S five-speed automatic transmission. The six-speed manual features a dual-mass flywheel for low vibration and a hydraulic clutch for consistent performance.
With the advanced Tiptronic S, the driver can place the shift lever into “D”, or Drive, and let the transmission do the shifting, or shift into “M”, Manual, and control gearshifts with steering wheel-mounted thumb switches.
Source: Porsche press