Subaru WRC Concept

Subaru has chosen September’s 62nd Frankfurt International Motor Show (IAA) for the biggest new model blitz in its history. Key attractions include the European debut for the completely new Impreza, a striking World Rally Car Concept, facelifted Tribeca luxury SUV, totally new Justy supermini and the world’s first horizontally-opposed ‘boxer’ turbo-diesel engine – due to be progressively installed in various models from spring 2008.

Subaru WRC driver, Petter Solberg, will speak at the Subaru press conference (Tuesday, September 11, Hall 8 at 2 pm) when the new Impreza-based WRC Concept will be unveiled.

Described as an indication of future styling trends for a world rally car, the WRC Concept is sure to draw the crowds – and conjure up speculation among enthusiasts and the press alike.

Also presenting at the press conference is Mr Matsatsugu Nagato, Fuji Heavy Industries’ Executive Vice President in charge of European markets.

He will unveil the completely new Impreza five-door hatchback in its 1.5 and 2.0 litre naturally-aspirated formats – aimed at appealing to a wider audience while still retaining Subaru’s distinctive ‘boxer’ engines and symmetrical all-wheel drive. Both technologies offer outstanding handling and roadholding with ‘real world’ active safety.

Other exhibits include a facelifted Tribeca with new front and rear styling plus a larger – but more efficient – 3.6 litre ‘boxer’ engine mated to a more responsive five-speed automatic gearbox. Other improvements include easier access to the optional third row of seats in the seven-seat versions.

A surprise appearance at the show is a completely new Justy 1.0 litre five-door supermini offering superb fuel economy coupled with low exhaust emissions. The front-wheel drive Justy will be supplied to Subaru for sale in Europe by Daihatsu Motor Co., Ltd.

Also guaranteed to generate intense interest is a display Subaru Boxer Turbo Diesel engine which will be fitted progressively to various models from spring 2008.

The world’s first horizontally-opposed diesel engine promises outstanding refinement, smoothness and low weight for excellent handling. In addition, fuel economy, performance and emissions will all be class-challenging.

Also underlying Subaru’s commitment to developing environmentally-friendly technologies is an example of its R1e electric city car – already in use in Japan.

Citroen C4 WRC

The Citroen C4 WRC - Citroen Sport's new weapon - made its debut in the Monte Carlo rally in 2007. It is the 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.

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 Citroen Sport stepped in. The project working group came up with a first rolling model of the Citroen 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 1 before validation of the full-size parts at the end of the project.

The program role of the development program 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 Citroen Sport then compared the performance of the C4 WRC with that of the Xsara, which remained the standard, the absolute reference.

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 Citroen to target the "drivers" and "manufacturers" titles once more from 2007.

Like the Xsara, its glorious predecessor, the Citroen C4 WRC features four-wheel drive and a 2-liter turbocharged engine mated to a cross-mounted 6-speed gearbox. At 165.4 inches, the C4 WRC is longer than the Xsara and, in line with regulations, therefore has a larger width of 70.1 inches, compared with 67 inches 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.

Subaru Impreza WRC 2007

Engine
Type: Turbocharged Flat-4
Displacement cu in (cc): 121 (1994)
Power bhp (kW) at RPM: 300(224) / 5500
Torque lb-ft (Nm) at RPM: 347(470) / 4000
Redline at RPM: n.a.

Brakes & Tires
Brakes F/R: Gravel: AP Racing 305 mm ventilated discs and 4-pot calipers front and rear
Asphalt, front brakes: 366 mm ventilated discs with 6-pot water-cooled calipers
Tires: BFGoodrich
Driveline: All Wheel Drive

Performance
Acceleration 0-62 mph s: depends on setup
Top Speed mph (km/h): depends on setup
Fuel Economy EPA city/highway mpg (l/100 km): n.a.

Subaru's New World Rally Championship Contender
The Subaru World Rally Team has unveiled the latest evolution of its rally challenger, the Impreza WRC2007, which will make its competitive debut on Rally Mexico (March 9-11) in the hands of Petter Solberg/Phil Mills and Chris Atkinson/Glenn Macneall.

As with previous incarnations of the iconic rally car, the Impreza WRC2007 is the result of a close collaboration between the teams of engineers and designers within Fuji Heavy Industries Ltd and Subaru Tecnica International (STI) in Japan and the Subaru World Rally Team in England.

The creation of the WRC2007 is a sign of Subaru’s ongoing commitment to the World Rally Championship as a way of proving the superior performance, reliability and safety of the Impreza model. Although the latest World Rally Car is outwardly similar to its predecessor, a number of key engineering improvements have justified the production of a new car for the remainder of this season.

Steve Farrell, director of engineering for the Subaru World Rally Team, explains: “The targets were to produce a car that has a more responsive front end with better traction and more balanced tire wear, particularly on longer stages. To achieve that, we have applied a different philosophy into areas such as weight distribution, suspension geometry and differential set-ups. We also have new dampers to improve road-holding and traction.

“The car also has a different radiator and intercooler pack. We made an evolution in the middle of last season and, with the benefit of the new homologation, we’ve been able to make a further step on that. We have simplified the layout, which has improved the air flow, made the front end of the car easier to service and lost some weight.

“Externally, the differences are relatively subtle. The front bumper has been restyled to suit the new radiator pack and the bonnet vents are different – we have twin side exits on the bonnet this time rather than one central one.”

Richard Taylor, Subaru World Rally Team managing director adds: “Since the latter part of last year we’ve worked very closely with Subaru in Japan to look at certain specific areas of the 2006 car and bring the new version to fruition as quickly as possible. This season we have started to work with BFGoodrich and Mexico will be our first gravel event with its tires, so we still have a considerable amount of learning to do in that respect.”

As the basis of a rally winning machine, few cars can match the competitive pedigree of the Impreza. First launched in 1992, the road car has developed in tandem with its rallying counterpart and over the last 13 seasons, the Impreza has scored 46 WRC victories and lessons learned on the rally stages have been fed back into the production model.

Like the road-going Impreza, at the heart of the rally car are two key parts of the Subaru philosophy, namely the Horizontally-opposed engine and the trademark Symmetrical AWD (All-Wheel-Drive). Through the work of STI and the Subaru World Rally Team, Subaru has established a two-way feedback process which complements both the road and rally car program.

Shigeo Sugaya, manufacturer principal, engineering, for the Subaru World Rally Team, says: “The collaboration between Subaru in Japan and England has worked extremely well to deliver the WRC2007 in a very short timeframe. Last autumn, engineers in Japan and England shared the idea before actual work started on both sides. Then development work was initiated as a joint project between the two teams.

“Our engineers in Japan are responsible for two main areas: the first is designing the bodyshell, including aerodynamics, and the other is improving the power unit. The engine itself contributes to further improving drivability in the middle to low speed range, which worked effectively in the Impreza WRC2006. As with previous designs, the engine is an all-aluminum construction, but the further use of light-weight materials means it is even lighter than before.

“On top of that, we work very closely with the Subaru World Rally Team engineers on specific projects and offer general support as and when it is needed. We also set up smaller groups including engineers from both Japan and England to develop areas such as the suspension or aerodynamics. The groups communicate directly, while my role is to oversee the success of each project. The WRC2007 does not represent a radical change for the team, instead we have made small evolutions in several areas.”

The team has used the WRC2006 for the first three rallies of the 2007 season and has scored points on each outing. In parallel, the new car has been undergoing testing on gravel roads in Italy and Spain. The two Subaru World Rally Team crews will drive the Impreza WRC2007 for Mexico and the subsequent 12 rounds of the WRC.

Today two Subaru Impreza WRC2007s were due to set off from the Subaru World Rally Team’s headquarters in Banbury, England to embark on the 5000-mile trip to Mexico in preparation for their debut in the World Rally Championship.