New 911 Turbo S: the ideal aerodynamic setup for every driving situation
More powerful, dynamic and comfortable than ever before: the new 911 Turbo S sets new standards in many areas. That is also true for the adaptive aero-dynamics, which Porsche has further enhanced in its flagship 911.
Porsche Active Aerodynamics (PAA) adapts the aerodynamic characteristics of the vehicle even more precisely to the driving situation, speed and selected driving mode.
No other sports car reacts to different situations with such aerodynamic flexibility as the new 911 Turbo S. We aerodynamic engineers are normally faced with a dilemma: a low drag coefficient is desirable for maximum speed and low consumption, while a high downforce is advantageous for driving dynamics. However, the two characteristics contradict each other, explains Dr Thomas Wiegand, Head of Aerodynamics Development at Porsche. PAA resolves the conflicts between these different aerodynamic goals. The comprehensive expansion of the intelligent system in the 911 Turbo S makes it possible to achieve a much larger spread between the aerodynamic configurations for optimum driving dynamics and minimum drag. What is more, there is increased potential for the aerodynamic components to support specific driving dynamics demands in every driving situation.
The new 911 Turbo S
Improvements have not just been made in adaptation to the specific requirements in driving operation, but also as regards the aerodynamic properties themselves: the newly designed active front spoiler and rear wing have increased the downforce by 15 percent to guarantee enhanced driving stability and dynamics at higher speeds.
The drag coefficient (cd) of the 911 Turbo S varies depending on the aerodynamic setting. The most efficient configuration with the minimum cd value of 0.33 is achieved with closed flaps and retracted front and rear spoilers.
The cooling air flaps: continuously adjustable
The newly developed controlled cooling air flaps permit a lower driving resistance and thus reduced fuel consumption. They are continuously adjustable and control the cooling air throughput through the radiators.
between the current cooling requirement, the electric power required to operate the radiator fan and the aerodynamic benefit of the cooling air flaps. As a result, the cooling air flaps are closed as far as possible from a driving speed of 70 km/h.
As from a speed of 150 km/h, the flaps open linearly to achieve the optimum aero-dynamic balance at high speed. Priority is also given to driving dynamics and the cooling air flaps are thus opened when the Sport, Sport Plus and Wet driving modes are active and when Porsche Stability Management (PSM) is deactivated or the spoiler button pressed.
The front spoiler: pneumatic actuation of individual segments
The effective aerodynamic area has been increased compared with the predecessor. Three segments can be inflated separately with the help of actuators. The two outer actuators always function synchronously. The front spoiler is made of a flexible plastic (elastomer) and can therefore be rotated so that the middle segment can be retracted or extended when the outer segments are extended.
The control unit and air compressor are installed at the side of the luggage compartment. The luggage compartment therefore has three litres more capacity. The variable front spoiler lip also increases the front overhang angle and contributes to everyday usability: the ground clearance is higher in the basic position, and is therefore suitable for parking manoeuvres or driving over speed bumps (sleeping policemen).
The rear wing: now with even more functions
Lightweight construction is used on the rear wing: the distinctive Turbo feature weighs 440 grams less than the corresponding component of the predecessor, but has an eight percent larger effective area. The basis of the wing is a foam core with forged inserts. Electric adjustment of the wing – which can be extended and tilted – is performed primarily depending on the speed and selected driving mode.
Apr 16, 2020 at 16:06