Porsche 911 Carrera 4 Cabriolet
The 2003 Porsche 911 Carrera 4 Cabriolet combines the classic beauty of the 911 convertible with the superior all-weather traction of all-wheel-drive and the enhanced control of the Porsche Stability Management system (PSM).
Based on the 911 Carrera Cabriolet, the 911 Carrera 4 Cabriolet differs most in that its drivetrain powers all four wheels. It uses an all-wheel drive system based on a viscous multi-plate clutch located directly behind the front differential. Weighing only 120 pounds (54 kg), the all-wheel drive system in the 911 Carrera 4 Cabriolet qualifies as one of the lightest such systems in the industry.
The all-wheel drive system directs 5 to 40 percent of the torque to the front wheels, depending on available traction and power applied. The viscous unit compensates for differing wheel speeds during cornering. While the 911 Carrera 4 Cabriolet exhibits superior traction on all road surfaces, Porsche did not intend the all-wheel drive system as an all-weather traction assistant. The all-wheel drive system was designed to handle the unexpected curves and bends in the roads as Porsche racecars always have.
Thanks to Porsche-patented VarioCam® Plus valve time and lift, the 3.6-liter “boxer” engine produces 315 horsepower (SAE) at 6,800 rpm and 273 lb.-ft. of torque at 4,250 rpm, with at least 236 lb.-ft. from 2,500-7,000 rpm, and at least 265 lb.-ft between 3,800 and 6,000.
Porsche offers a choice of two transmissions: a precisely shifting standard six-speed manual and the optional Tiptronic® S five-speed automatic transmission.
The Tiptronic S transmission is adopted from the 911 Turbo, which can handle greater torque output. The lock-up torque converter and shifting programs have been specially tailored to the naturally aspirated engine.
Source: Porsche press