The Porsche in the ear doctor
In the automobile will actually leave nothing to chance. True to the motto: "Who wants to feel, must be able to hear," drive the manufacturer great expense to the sound of their vehicles right to vote. Then come even speakers in the exhaust is used.
"The sound of a car is part of the charm of driving," says Rainer Schmidetzki. This has the developers at Volkswagen in Wolfsburg, no doubt. For vehicles for a broad customer base, although one eighth of a possible subtle and balanced engine sound. Not for nothing is about the new Golf the quietest Golf of all time. "But the sport, a model is positioned to sound more meaty and powerful must be the engine."
"The sound there is not an engine," says Bernhard Pfafflin from the Porsche Development Centre in Weissach near Stuttgart. "What we hear from the drive is always a combination of the intake noise, mechanics in the motor and the mouth of the exhaust sound." And the art is to compose these three votes a good sound.
"We have set screws while many", says VW developers Schmidetzki and exhaust system, the engine and the switching logic counts on the transmission. There are also numerous active systems to the speaker in the exhaust system, with which the developer can vary the pitch of a car.
"But the margin is narrow, because the legislature makes us harsh." While only the volume and the tone was not prescribed, but the quieter one car is, the harder you can hear nuances. For high-volume models, the developers strive to beat these limits to partially clear: For quiet sounds noble and puts even a small car in the direction of subjective upper class. "But with cars like a GTI, or even an R-model, we irritate the limits full» says Schmidetzki.
can make only the volume but not of it, however, restricts Pfafflin: "According to everyone, nice contrast, not all sounds." Setting the tone were ignited in the first place, the engine and exhaust system itself: After how many injections as a diesel, how much fuel / air mixture is blown into the combustion chambers of a V6 and the pistons have to travel that way - all that determines the timbre as well as length and diameter of the exhaust system and their pots. The so often quoted tailpipe but has nothing to do Schmidetzki says: "There can let off steam only designers."
In addition to these so-called passive variables, there are a range of active measures for sound tuning, ranging from valves in the air flow to pneumatic valves in the exhaust system, as they are about in the silencers of the Maserati Gran Turismo S used.
What influence can have the electronics, shown by the example of the Mercedes SLK, which has received a facelift in 2008 with the so-called sports engine. The six-cylinder sporty looks but not only because of the higher performance, but also by "a deliberately powerful sports engine acoustics" with strikingly emotional sound design decelerates, says Mercedes. In plain language: The six sounds tough and a little louder than before. And on top of the engine blows when switching back additional fuel into the cylinder, because this blipping sounds a little race track.
Sounds like a car from the outside, but only one side of the coin, restricts VW Schmidetzki developer: "Just as important is the sound in the interior." Where the legislature does not prescribe them, the engineers have a larger playing field - and benefit from them. It is conceivable, for example, the so-called fire wall, so the dividing wall between the engine and interior, electronic stimulating as the membrane of a loudspeaker. "In principle, one could also even" import songs, says Schmidetzki. But instead Madonna roars on this channel, only the engine.
Even with the attention of the Porsche sound developers is at least partially on the interior. must feel, "The driver not only acceleration, but can also hear, that he experienced as pleasure," says developer Pfafflin. No wonder the intake system of the Boxster directly behind the driver's door or the air filter of the Carrera was open to the interior out. "The driver has the engine literally better in the ear."
The fact that the sound designer for the car manufacturers with the advent of electric cars could be inactive, is hardly to be feared. Although electric motors run really silent, and for many customers makes that what the appeal of these cars. But his job at Porsche developers Pfafflin therefore afraid not, "These are new challenges and technologies on which we make our already mind. One thing is certain: even an electric Porsche we would give his own unique sound. "
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