Mercedes-Benz SL a 'concert on wheels'
By Mark Hinchliffe · 11 Jan 2012
The Koreans starred, the Japanese mounted a comeback, and One Ford hit the headlines with an extended family of Focus-based newcomers that it is certain to make a big hit in Australia. But it was one car and the commitment of its company chief that made the most impact as America fought back on the opening day of the 2011 North American International Motor Show.The sound system in the all-new Mercedes-Benz SL features two massive bass speakers in the front footwell that are mounted into the aluminium chassis for maximum bass output. Benz boss Dieter Zetsche describes the sports car as "a concert hall on wheels". With up to 12 speakers and a 900-watt optional Bang & Olufsen sound system, it is bound to blow the opposition away. The new SL will arrive in Australia before the end of the year and, according to local Mercedes spokesman David McCarthy, there will be "little or no change" (in price). The current model ranges in price from $242,780 to $519,250. McCarthy says we will get a full four-vehicle range of V6 and V8, plus AMG V8 and V12, but there will be no diesel or four-cylinder models. The oldest car in the Mercedes-Benz family is the first mass-production model to feature a chassis and body made almost entirely of lightweight aluminium. At 140kg less than the previous model it truly is deserving of the SL name which stands for "super lightweight" and began in the 1950s with a tubular steel frame. The folding hard-top roof is 15kg lighter and made mainly of magnesium while the only steel is in strategic positions such as around the windscreen for crash protection. The chassis is also 20 per cent stiffer, making it more agile. While the sports car has not yet been crash tested, SL boss Uwe Erntsberger believes it will earn a maximum five stars. Carbon fibre was also considered for the frame and body, but were not considered suitable in front and rear crash structures, he says. However, he confirms the AMG versions will have some carbon fibre parts such as the boot lid. Erntsberger says the aluminium structure technology will find its way into other Benz models, starting with the 2014 E-Class which will be about 200kg lighter. He says the frame has not been engineered for electric powertrains, "but hybrid is possible, but not yet tested". The weight saving shows up in better fuel economy, lower emissions and claimed improved agility. The new V8 may be 80cc smaller at 4663cc, but the biturbo has 12 per cent more power (320kW) and 32 per cent more torque (699Nm), yet fuel economy is improved thanks in part to a stop-start function and an optimised seven-speed static transmission. Benz boss Dieter Zetsche says the V8 has the power of a V12 but the economy of a V6. He says the SL will continue the model's 60-year tradition of being a benchmark for the brand. The new SL is also a tour de force of technology with a system that detects weary drivers, an optional "Magic Sky" glass roof that turns from clear to opaque at the touch of a button, automatic boot opening and closing with the wave of a hand, internet connectivity and a wiper/washer system that won't wet the driver and passenger.There is even an option that heats the rubber blades and water to remove ice. But it's that FrontBass speaker system that will blow many away. It is standard with the six-speaker base audio system, as well as the optional 600-watt Harman Kardon system or flagship B&O. Other car manufacturers have used the spare tyre as bass resonators or packed in massive cargo-stealing boxes to maximize the bass, but this system makes clever use of the hollow sections of the chassis to act as resonating chambers for the woofers. Erntsberger says a good audio system is a "very important factor for buyers, particularly AMG". To further improve the audio experience, designers have reduced the wind noise by reducing the aerodynamic drag coefficient to 0.27 and improving the rear mesh screen which deploys electronically.Mercedes-Benz SLPrices: from $242,780 to $519,250Body: 2-seater coupeEngines: V6, V8 and V12 biturboTransmission: 7-speed auto, RWD