Superb airflow · Despite its increased width, the Turbo Coupe has an efficient and stable Cd of just 0.31. Porsche

Superb airflow Despite its increased width, the Turbo Coupe has an efficient and stable Cd of just 0.31. Porsche aerodynamicists achieved both a sleek shape and high-speed stability. Lift at the front axle has been reduced as compared with the previous model and downforce at the rear axle has been increased. The driver appreciates these forces as superb higher speed stability and predictable handling. The split rear wing The Turbo Coupe benefits from a rear spoiler that increases downforce without adding drag. The rear wing is more efficient than on earlier models. When fully extended, the spoiler is 1.37 inches (35 mm) lower than before, which enhances the car's aerodynamic balance. The result is increased stability for more driver confidence during high-speed maneuvering, such as changing lanes. The revised rear spoiler maintains the car’s excellent drag coefficient even though the new design increases downforce at the rear of the car by 60 pounds (27 kg). The innovative split wing is approximately 1.18-inch (30-mm) wider on each side than the rear wing on the previous model, and is contoured to match the body at either end. The rear spoiler automatically extends when the car reaches approximately 75 mph (120 kph) and retracts smoothly when the car slows to approximately 37 mph (60 kph). Optional fixed spoiler Drivers who want even further high-speed stability can opt for the newly available Aerokit Turbo. This features a different, deeper front spoiler lip and a revised rear decklid with a fixed rear double -winged rear spoiler. What's underneath counts Since airflow beneath the car affects fuel economy, handling and stability as much as air moving over the car, Porsche aerodynamicists paid careful attention to the underbody design. As on the other models in the 911 model range, the underfloor of the Turbo Coupe is almost completely enclosed for optimum airflow beneath the car. This reduces turbulence and keeps air swirl to a minimum. On cars equipped with the manual gearbox model, the underfloor cover is six polypropylene panels over an area almost double the covered area of the previous model. Enhanced engine cooling To ensure that the tremendous heat generated by the turbocharged engine is dissipated, the Turbo Coupe has three radiators. There is one radiator mounted ahead of each front wheel as well as one mounted centrally in the front air dam. This radiator array is fed by approximately 4000 liters (140 cu.-ft.) of air per second at 186 mph (300 kmph).