In addition, the side radiator diverter blades are larger than before for improved airflow and to · minimize lift forces on the fr

In addition, the side radiator diverter blades are larger than before for improved airflow and to minimize lift forces on the front wheels. Finally, the front differential is vented by four front underbody channels. A rear opening vents the gearbox. Superb aerodynamics in an open-top car also mean a quiet and buffeting-free passenger cabin. Porsche aerodynamicists broke new ground by using specially created test dummies to measure airflow and turbulence in an open cockpit. As a result, they were able to develop a wind deflector that minimizes cockpit turbulence. Sharing a unique chassis As a member of the Porsche 911 family, the Turbo Cabriolet rides on the fully independent suspension pioneered for that series. As the top of the open 911 line, however, the Turbo Cabriolet also comes standard with Porsche Active Suspension Management (PASM). Mechanically, the front suspension consists of Porsche configured MacPherson struts—with gas pressurized, electronically controlled single-sleeve shocks—longitudinal and lateral arms and antiroll bar. At the rear, each wheel is located by a multilink setup with five control arms, coil springs mounted over electronically controlled, twin sleeve gas pressurized shocks, with an antiroll bar. Essentially, these components are the same as those found under the Turbo Coupe, with some important modifications mandated by the Cabriolet's open roof. Specifically, the Cabriolet's rear springs are longer than the Coupe's to allow the extra downforce at the rear created by the additional extension of the rear spoiler. Compared with its predecessor, the new open-air 911 Turbo has a lighter suspension, the four lightweight spring struts alone accounting for a nearly 6-pound (2.4 kg) weight savings. The car's stance has also been widened compared to the previous car, with 0.71-inches (18 mm) more front track and a 0.79-inch (20 mm) wider rear. Right for the ride The shocks are all under the purview of PASM. Reacting to road and driving conditions, PASM adjusts the shocks individually, altering their firmness within fractions of a second. The driver selects one of two settings, Normal or Sports. The Normal mode provides a softer ride, with the system automatically switching over to a more sporting program as the driver becomes more aggressive. In Normal mode, PASM delivers a more comfortable ride over various road surfaces than a system with conventional shocks. The Sports mode activates a harder shock control map, comparable to the typical features of a sports suspension, and acts to minimize body roll during hard cornering. For the new Turbo Cabriolet, Porsche engineers have enhanced the system to work in conjunction with PTM all-wheel drive and Porsche Stability Management (PSM). Constantly adjusting to the driver’s style as well as conditions, these systems help the driver maintain control without intruding or coarsely wresting control from the driver. The result is an extraordinarily high-level of driver confidence while enjoying the car's impressive traction and high-speed stability capabilities.