By reducing torque converter slip, and adjusting to engine speed more quickly, the Turbo Coupe's · Tiptronic S reacts more quickly

By reducing torque converter slip, and adjusting to engine speed more quickly, the Turbo Coupe's Tiptronic S reacts more quickly to the accelerator pedal for improved responsiveness, and a more connected feeling via the throttle. The optional five-speed Tiptronic S allows the driver to permit the transmission to shift gears automatically or shift for himself via steering-wheel mounted paddles or by tipping the console-mounted gear lever. The Tiptronic S features a Fast-Off function which prevents the transmission from upshifting when the driver lifts off the gas pedal abruptly. This allows the driver to downshift more quickly when applying the brakes while driving enthusiastically. In addition, the Fast-Back function operates whenever the driver changes over from the accelerator to the brake pedal within 1.5 seconds, Tiptronic S immediately downshifts a gear, even if the driver only touches the brake pedal hard enough to activate the brake lights. This shortens the reaction time of the first downshift while braking by approximately 30 percent. When downshifting while braking with normal force, the system changes gears only as a function of the car’s actual deceleration, maintaining a certain time-lag between activation of the brake pedal before Tiptronic S actually downshifts. The Fast-Back function operates on top of this brake downshift function and, for example when braking into a bend, automatically selects the optimum gear for subsequent acceleration out of the corner. When the Tiptronic S is coupled with the optional Sports Chrono Package Turbo, the engine management system receives a signal for brief interim throttle, resulting in even quicker gearshifts. The proof of the changes is in the driving: track testing with factory drivers, the Turbo Coupe with Tiptronic S accelerated to 60 mph (100 kph) 0.3 seconds faster than the Turbo with six-speed manual gearbox. The difference between the two gearboxes in the run to 99 mph (160 kph), is even greater, 7.8 seconds for the Tiptronic S and 8.4 seconds for the manual. And unlike other makers' automatic transmissions, the Turbo Coupe's Tiptronic S starts from a stop in First, not Second, gear for a quick launch. The comforting stability of all-wheel drive To ensure that the engine's output is put safely and competently to the road, the Turbo Coupe comes only with Porsche's all-wheel drive system, Porsche Traction Management (PTM). PTM distributes engine power between the front and rear axle based on available traction and road conditions. Though the system can vary the torque split infinitely from zero to 100 percent at either axle as needs be, the normal bias is with about two-thirds of the torque to the rear wheels. As most Porsche purists prefer, and has been since the company's inception, the Turbo Coupe behaves most normally as a rear-wheel drive sports car.