The return of the V8 engine to the Cayenne GTS models does not just mean that there is now more power and torque available than before. The standard sports exhaust system has a new tuning configuration and also underlines the all-round improvement in performance with its rich V8 sound. The GTS models benefit from the same generation of engine as the Cayenne Turbo. The V8 biturbo engine has been developed by Porsche and is built in the engine plant in Zuffenhausen. In the Cayenne GTS, the four-litre engine delivers 338 kW (460 PS) and transfers up to 620 Nm of torque to the crankshaft. The current V8 biturbo engine generation features a host of technology highlights that also benefit the new GTS models: equipped with adaptive cylinder control, direct petrol injection with central injector position and an intelligently designed thermal management system, the engines offer the ideal prerequisites for increased efficiency. Like in all Cayenne models, a Tiptronic S eight-speed automatic gearbox is responsible for transferring power from the engine.
Instantaneous response thanks to central turbo layout
A host of technology highlights are also implemented in the four-litre V8 biturbo engine used for the new Cayenne GTS models. The exhaust turbochargers are located inside the cylinder V in a central turbo layout. This arrangement means that the engine has much more compact dimensions, allowing it to be installed lower in the car. The shortened exhaust gas paths between the combustion chambers and turbochargers result in more instantaneous response characteristics. The central turbo layout therefore enables the development of more power. The new counter-rotating twin-scroll turbochargers generate high torque at low engine speeds, also improving the responsiveness of the engine. The exhaust gas flows of the turbochargers are continuously fed to the turbine wheel as separate streams, significantly reducing any V8-specific charge cycle disadvantages. The optimised direct petrol injection system is characterised by the central injector position in the combustion chamber. The solenoid-driven high-pressure fuel injectors are designed as multi-hole injectors with seven spray holes while the optimised alignment of the individual spray jets guarantees homogeneous mixture formation. The central injector position and the higher injection pressures also ensure optimum combustion with increased efficiency in all operating states. Furthermore, innovative production methods and materials are used. For example, it was possible to significantly reduce the weight of the cylinder crankcase by manufacturing this component by means of the sand casting core package process and by using high-strength main bearing covers secured with four bolts. At the same time, it was possible to increase rigidity to cope with the higher power outputs. Innovative processes were also used in production, such as an iron-coated liner applied by means of atmospheric plasma spraying. This is an extremely robust coating that is able to withstand high loads and is subject to practically no liner wear.
With an output of 338 kW (460 PS), the new Cayenne GTS models make 14 kW (20 PS) more power than their predecessor. Torque has also been increased by 20 Nm to 620 Nm. In combination with the Sport Chrono package (standard on the Coupé), the new Cayenne GTS and Cayenne GTS Coupé accelerate from 0-100 km/h in an impressive 4.5 seconds and from 0-200 km/h in 17.6 seconds. In the 0-100 km/h sprint, they are therefore 0.6 seconds faster than their predecessor.
Rich sound with unique character
The noise they make has traditionally been a particularly important characteristic of the GTS models. In a complex and detailed programme, a sports exhaust system has been specially developed for the new Cayenne GTS models, acoustically underlining their sporty appearance with a highly emotive sound. The new models are already equipped as standard with a switchable sports exhaust system, which intensifies the powerful sound of the V8 engine. The exhaust system's design, with its tailpipes located at the outer corners of the rear of the car, was focussed on achieving a sporty and rich sound with a unique character. This offers an even more emotive sound in both Sport and Sport Plus modes, with a sonorous burbling on the overrun. The sports exhaust system can also be activated in the “Car” menu via the Porsche Communication Management (PCM).
The twin-branch sports exhaust system has a modified, large-volume rear silencer and, compared with the options available on the other Cayenne models, the standard sports exhaust systems of the GTS models differ through the additional measures implemented for enhanced perception in the vehicles' interiors. This includes targeted reduction of the insulating material mainly in the rear area, which means that the sound can be experienced even more intensively by the vehicle occupants. The standard sports exhaust system features twin tailpipes finished in high-gloss Black located at the outer left and right sides, thereby also visually ensuring the sporty appearance of the Cayenne GTS models.
Centrally located sports exhaust system for the Coupé with Lightweight Sports Package
The perception of the noises they make differs between the Cayenne GTS and Cayenne GTS Coupé due to their different interior architectures and resultant interior volumes. Details such as the differences in the design of the luggage compartment cover (Cayenne GTS: variable, Cayenne GTS Coupé: fixed) also influence the sound experience. In addition, a sports exhaust system with centrally located oval tailpipes has been developed for the Cayenne GTS Coupé. This new exhaust system is available only in combination with the Lightweight Sports Package and will be also be offered in the future on the Cayenne Turbo Coupé and Cayenne Turbo S E-Hybrid Coupé.
The sports exhaust system, with its centrally positioned tailpipes, has a fundamentally different design to the exhaust system that has its tailpipes located at the outer sides. The two exhaust tracts of the cylinder banks are separate from each other over the entire path from the centre silencer through to the rear silencer and exhaust gas outlets to the open air. The central position of its tailpipes is a characteristic feature of the new exhaust system. In the case of the sports exhaust system that has its tailpipes positioned at the outer sides, the openings are located correspondingly on the left and right. There is a continuously adjustable flap in the main left and right tracts located just upstream of the main silencer. These flaps are controlled via engine speed and load maps. A bypass branches off from the main tract before the flaps, which ends in a chamber of the main silencer. Perforated inner floors divide these chambers into three areas through which the exhaust gas flow is routed before it returns to the main tract and is then discharged to the outside. Depending on the switching status of the flaps, either all of the exhaust gas flow or a defined proportion passes through the main tract or bypass and silencer. This results in a clearly differentiated sound pattern. The high-frequency tuning comes from the world of motor sports and ensures a differentiated and unique sound experience.
The differences in the sound of the standard sports exhaust system compared to that of the centrally located sports exhaust system, which comes in combination with the optional Lightweight Sports Package, can be most appreciated when driving under high load and at higher engine speeds (in Sport or Sport Plus modes).
