This Man made the Cayenne GTS sound V8 again.
How the Cayenne GTS sounds like a high performance athlete, instead of an iron pumping muscle man..
Whilst the new Cayenne GTS is fresh on the blocks for us in the UK, behind the scenes in Stuttgart the GTS had been undergoing a rigorous training regime for over 4 years. Back in 2016 Jörg Winkel, the then head of the Acoustics Department, was tasked with creating an all new sports exhaust for the future GTS. In conjunction with Markus Sitzler, overall big boss for SUV-engines, a brand new exhaust system began to take shape.
An original design showing placement of bypass and valve © Porsche AG
Their brief was quite complicated. Porsche needed the inherent sportiness of the GTS's 454bhp V8 to be heard when starting the engine, under heavy load and at high engine speeds. However, they also wanted customers to enjoy the volume of the V8 biturbo at low engine speeds, my personal favourite part of the V8 experience, all whilst meeting country-specific requirements on noise emissions. Well, judging from the numerous reviews I think they succeeded.
Taking inspiration from the 911 GT line, the acoustic department decided to design an exhaust system where the tailpipes would be in the centre of the rear diffuser, a first for the Cayenne. If we take the Cayenne Turbo S with its big quad exhausts to be the muscle man in Porsche's analogy, the visual impact of the centre tailpipes helps create a sportier image for the GTS. Whilst the Turbo S has a big, heavy sounding sound track from practically the same V8 block as the GTS, it was all down to the exhaust system to create a lighter, more sporting sound. Markus Sitler describes it as; “The sonorousness you would expect from a V8, flavoured with a dash of GT racing.”
To make this new sound Porsche opted for an exhaust tract for each cylinder bank, feeding into the centre silencer, through to the rear silencer containing a bypass and active valve, and out the tailpipes to the open air.
The all new GTS exhaust system © Porsche AG
Herr Sitzler explains how it all works;
“When the exhaust flap is closed, at low revs, the exhaust gas flow follows the bypass. In essence, it travels along an additional loop through a chamber of the main silencer with a perforated inner bottom before it returns to the main tract and is then discharged to the outside”.
The GTS sound is therefore quieter than under full load, but the bass tones are still rich. The sound intensity is dependent on the switching status of the flaps, which are continuously controlled via engine speed and load maps. The new sports exhaust system’s sound varies depending on what percentage of the exhaust gas flow passes through the main tract, bypass and silencer. The special design of the twin-branch, central sports exhaust system means that it reveals even more of its sporty sound than the standard system with its tailpipes arranged at the outer edges, especially at high engine speeds. In the passenger compartment, the engineers deliberately reduced the amount of insulation material, mainly in the rear of the car, which makes the sound experience more intense for the passengers and enhances the GTS driving experience, with no compromise of comfort."
So instead of the muscle bound Turbo S hammering every road into submission, the GTS is designed to float like a butterfly and sting like a bee. Nimble, yet enough punch to make every journey a little more exciting than it should be.
Source: Porsche Newsroom