The Turbo Cabriolet, like the Coupe, has power-assisted, variable-ratio rack-and-pinion steering as · standard. The steering wheel

The Turbo Cabriolet, like the Coupe, has power-assisted, variable-ratio rack-and-pinion steering as standard. The steering wheel is adjustable for both height and reach. Deceleration to match acceleration Like all Porsche vehicles, the 911 Turbo Cabriolet boasts extremely effective brakes. The all-disc, antilock brake system uses large, 13.78-inch (350 mm) diameter rotors and fixed calipers at all four wheels. The front brakes have the same six-piston calipers as the Carrera GT, while the rears utilize four pistons. The caliper pistons have ceramic inserts which insulate them and help keep heat from transferring to the brake fluid during long periods of hard braking. The brakes themselves are cooled by carefully directed airflow. In front, air moves through two openings in the front spoiler to a wide duct in one of the front underbody panels and on to the front axle. Unlike the previous model, the new Turbo Cabriolet's rear brakes also have dedicated cooling air ducts. For even greater stopping power, the Turbo Cabriolet is available with Porsche Ceramic Composite Brakes (PCCB) as an option. Besides replacing the metal rotors with ceramic composite, PCCB brings rotors that are almost eight percent larger than standard: 14.96 inches (380 mm). Among the benefits of PCCB are a 50-percent weight reduction compared to metal brakes, quicker response, superb resistance to fade and zero corrosion. Like the Turbo Coupe, the new Turbo Cabriolet rides on massive, low profile tires. For instant steering response, the front tires are 235/35ZR19 mounted on 8.5Jx19 inch light alloy wheels. The rear is carried by 305/30ZR19 tires on 11x19-inch alloy wheels. A tire-pressure monitoring system is standard equipment. To save 22 pounds (10 kg) and space, the Turbo Cabriolet carries no spare tire. Instead the car has a small electric air compressor and emergency tire sealant. This allows the driver to safely drive at speeds up to 50 mph (80 kph) to have the tire properly repaired or replaced. Powertrain Details Astounding output per liter As with every Porsche Turbo sports car before it, the heart of the new 911 Turbo Cabriolet lies behind the passenger compartment: the unique Porsche turbocharged six-cylinder engine. The 3.6-liter flat six develops 480 bhp (353 kW) at 6000 rpm, or an awesomely efficient 133 bhp (98.1 kW) per liter. Given the convertible's low 3649-pound mass, the 911 Turbo Cabriolet has an outstanding power-to-weight ratio of only 7.6 pounds/hp. But knowing full well that torque is what moves the automotive world, the Porsche engine designers developed a twin turbocharged engine that offers a peak torque of 460 lb.-ft. (620 Nm) available over an extremely broad range, from 1950 rpm to 5000 rpm. The optionally available Overboost feature briefly ups the torque peak to 505 lb.-ft. (680 Nm) from 2100 rpm to 4000 rpm. As astounding as the Turbo Cabriolet's brutal acceleration is its miserly fuel consumption. The EPA rates the Turbo Cabriolet at 15 mpg in the city.