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7G-TRONIC - Gearbox: Mercedes-Benz presents the world’s first seven-speed automatic transmission for passenger cars.
Fitted as standard in five eight-cylinder models from autumn 2003
Fuel saving of up to 0.6 litres per 100 kilometres
Even shorter acceleration times and quicker intermediate sprints
| May 14, 2003 - The world’s first standard-fitted seven-speed automatic transmission for passenger cars will make future Mercedes models even more economical and further boost their acceleration. In addition, the new transmission variant will also considerably enhance shifting comfort still further.The new 7G-TRONIC seven-speed automatic transmission will be a standard feature of the E 500, S 430, S 500, CL 500 and SL 500 models from autumn 2003, replacing the five-speed automatic version currently fitted.
The newly developed seven-speed automatic transmission reduces fuel consumption in the NEDC driving cycle by as much as 0.6 litres per 100 kilometres (depending on the car), increases acceleration from 0 to 100 km/h by up to 0.3 seconds and allows significantly quicker intermediate sprints from 60 to 120 km/h. At the same time, shifting is even smoother, and therefore more comfortable, than with the automatic transmission presently used.
The Mercedes engineers have achieved these advances above all through the use of seven gear ratios. These allow the automatic transmission to retain the small increases in engine speed which are important in ensuring optimum gear ratios, whilst at the same time offering a larger ratio spread between the lowest and highest gear. This gives the electronic control unit more flexibility to adjust shifting in such as way as to keep fuel consumption low and the transmission’s reactions fast. What’s more, it also lowers the average engine speed – a clear plus point in terms of both cutting fuel consumption and keeping the lid on noise levels. | |
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