Following the popular symbol Xsara WRC, the 2007 Citroen C4 WRC came to replace it, providing newest technology and a complete adaptation to the international regulations, through style and performance. This is how the roof of the Citroen C4 WRC no longer has a glass roof. It was changed because car races banned this detail from their competitions. The Citroen designers had to modify also the front and rear bumper, the wings from the both sides, and the spoiler. They had to work with wind airs to validate the power train subsystem and a number of other body parts. The objective of the team is to obtain a high prize in rally events. This is why they are still working to improve the Citroen C4 WRC capabilities. The car has now a 2 liters turbocharged engine, 4.20 meters and a better stability thanks to the 1800 mm width.
The C4 Citroen Sport concept car was a vehicle symbolising the renewal of the Marque. It was the result of cooperation between engineers from the styling and sports departments. In the first instance, the project completely disregarded regulatory requirements. A true exercise in style, it met the challenge of developing a futuristic vision of a new car. A car to replace the Xsara WRC, winner of three world 'manufacturers' crowns between 2003 and 2005. In the expert hands of Citroen Sport's engineers at Versailles Satory, the C4 Citroen Sport concept car became the C4 WRC.
Adapting to regulations
Although the overall styling was maintained, the car had to be adapted to international regulations and performance requirements. This is where the design office of CitroŽn Sport stepped in. The project working group came up with a first rolling model of the CitroŽn C4 WRC that was already a long way from the original concept. The roof, for example, was no longer made of glass, since this is banned in rally racing. The front and rear wings, bumpers and spoiler were modified to satisfy regulations and performance criteria. To save time and money, a number of body parts were studied in wind tunnels on a scale of ľ before validation of the full-size parts at the end of the project.
The main lines of the development programme
The role of the development programme was to validate the parts and powertrain sub-systems developed by the design office. Reliability was the first factor and performance the second. To achieve the desired result, several working sessions were necessary on both asphalt and gravel. The technical team of CitroŽn Sport then compared the performance of the C4 WRC with that of the Xsara, which remained the standard, the absolute reference. Although it is still in its development phase, the CitroŽn C4 WRC has shown real potential. Now, its performance can only truly be confirmed in rally conditions.
Expectations and objectives
The mechanics, engineers, crews and managers of CitroŽn Sport, are impatient to see how the C4 WRC performs in an actual rally event. Designed to be as easy to drive and as reliable as the Xsara WRC, the C4 WRC aims to set even higher standards of efficiency and performance. A car built and developed to enable CitroŽn to target the 'drivers' and 'manufacturers' titles once more from 2007.
Main technical characteristics of the Citroen C4 WRC
Like the Xsara, its glorious predecessor, the Citroen C4 WRC features four-wheel drive and a 2-litre turbocharged engine mated to a cross-mounted 6-speed gearbox. At 4.20 m, the C4 WRC is longer than the Xsara and, in line with regulations, therefore has a larger width of 1,800 mm, compared with 1,700 mm for the Xsara. This change should provide better stability on bends.
As also laid down in the new regulations, the use of electronic driving aids is limited, in the same way as for the Xsara in its 2006 configuration. Referring again to the regulatory budget cuts, the sub-systems of the C4 WRC - such as the engines, gearboxes, front, central and rear differentials and dampers - must last longer and be more reliable.
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