Building a car that meets strict regulations is challenging for automakers. They have to consider emissions, safety rules, and noise levels. For companies like Porsche that specialize in performance vehicles, managing noise levels can be especially difficult. In the late 1980s, Porsche created a unique prototype based on the 928 model to address this issue. This one-off vehicle was designed to evaluate the noise levels of different tire compounds.
The Porsche 928 noise test car, as it came to be known, was quite an unusual sight. The engineers wrapped the body of the car in cotton wool to help isolate and reduce engine, intake, and exhaust noise. Some components of the car were even repositioned outside the body for testing purposes. The radiator was placed in front of the front bumper, and hood scoops were added to cool the engine with fans. The intake process took place in a large barrel on the hood, with cables connected to the enclosed engine bay. Visibility was sacrificed for the sake of noise testing, with the rear window obstructed by a custom exhaust system featuring a large muffler.
The Porsche 928 noise test car also featured bulging wheel arches to accommodate various wheel and tire combinations. The choice of the 928 model was deliberate, as the air-cooled 911 was too loud for the job, and other models like the 924 and 944 were not suitable for different reasons. The car was initially tested on an existing skidpad, but as conditions changed, Porsche built a specialized noise measuring track with standardized asphalt for more accurate results.
Despite its unconventional appearance, the Porsche 928 noise test car served an important purpose. It helped Porsche engineers make their sports cars quieter to comply with noise level regulations. After over 30 years of service, the prototype now resides at the Porsche Museum in Stuttgart as a testament to the company’s commitment to innovation and compliance with regulations.
The story of the Porsche 928 noise test car is a fascinating example of how automakers overcome challenges in designing and testing their vehicles. It underscores the importance of meeting regulatory requirements while maintaining performance and functionality. The innovative approach taken by Porsche in creating this unique prototype showcases the company’s dedication to excellence and continuous improvement in the automotive industry.