World Rally Car

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World Rally Car is a racing automobile built to the specification set by the FIA, the international motorsports governing body and compete in the outright class of the World Rally Championship (WRC). The WRC specifications were introduced by the FIA in 1997.[1]

Regulations[edit]

1997–2010[edit]

A Subaru Impreza WRC2006 being prepared by Prodrive

Between 1997 and 2010, the regulations mandated that World Rally Cars must have been built upon a production car with a minimum production run of 2500 units. A number of modifications could be made including increasing the engine displacement up to 2.0L, forced induction (including an anti-lag system), addition of four wheel drive, fitment of a sequential gearbox, aerodynamic body modifications, weight reduction to a minimum of 1230 kg and chassis strengthening for greater rigidity.

Unlike the requirements for the preceding Group A cars, manufacturers were no longer required to build "homologation specials" in order to meet approval. The base model did not need to have all the characteristics of the WRC car, as evidenced from cars such the Peugeot 206, 307, Citroën Xsara and Škoda Fabia, which during this period had no road car variant with a turbocharged petrol engine or four wheel drive.

To limit power, all forced induction cars were fitted with a 34 mm diameter air restrictor before the turbocharger inlet, limiting the air flow to about 10 cubic meters per minute. The restriction was intended to limited power output to 300 hp although some WRC engines were believed to produce around 330–340 hp.[citation needed] Engine development did not focus on peak power output but towards producing a very wide powerband (or power curve). Typically, power output in excess of 300 hp was available from 3000 rpm to the 7500 rpm maximum, with a peak of 330–340 hp at around 5500 rpm. At 2000 rpm (the engine idle speed in "stage" mode) power output was slightly above 200 hp.[2]

2011–present[edit]

Starting in 2011, rules for WRC cars have changed to be more restrictive. Now the regulations are derived from the ones for S2000 cars, with a different engine and an aerodynamic kit. The cars are smaller models (there is no longer a minimum 4m length), with a 1600 cm3 direct injection turbo engine with a 33 mm diameter air restrictor and a maximum pressure of 2.5 bar absolute (this will limit torque to about 400 N.m or less[3]). Exotic materials (titanium, magnesium, ceramics and composite) are forbidden except when present in the base model. Carbon fibre and aramid fibre are very restricted ("only one layer of fabric is used and is affixed to the visible face of the part"), except for bodywork's side protections where multiple layers of aramid fibre are allowed. The gear changes must be made with a mechanical system (so paddle shifters are not allowed unless a driver has limited movement in their right hand like Robert Kubica, thereby an FIA-controlled, left-handed paddle shift is permitted). There is no center differential (earlier it used to be 3 differentials, with a center/3rd differential included), but the new regulation allows only front and rear axle differential (eliminating the center differential to reduce cost)[citation needed], and they must be mechanical, without electronic control or hydraulic or viscous systems (from 2006 to 2010 the center differential and previously all 3 could be active[4]). Minimum weight is 1200 kg empty and 1350 kg with driver and co-driver (in both cases with only one spare wheel).[5]

Cars[edit]


Citroën Xsara WRC

Citroën C4 WRC

Citroën DS3 WRC

Ford Escort WRC

Ford Focus RS WRC

Ford Fiesta RS WRC

Hyundai Accent WRC

Hyundai i20 WRC

Mini John Cooper Works WRC

Mitsubishi Lancer WRC

Peugeot 206 WRC

Peugeot 307 WRC

SEAT Córdoba WRC

Škoda Fabia WRC

Subaru Impreza WRC

Suzuki SX4 WRC

Toyota Corolla WRC

Volkswagen Polo R WRC
Manufacturer Car From To
France Citroën Xsara WRC 2001 2006
C4 WRC 2007 2010
DS3 WRC 2011 -
United States/United Kingdom Ford Escort WRC 1997 1998
Focus RS WRC 1999 2010
Fiesta RS WRC 2011 -
South Korea/Germany Hyundai Accent WRC 2000 2003
i20 WRC 2014 -
United Kingdom MINI John Cooper Works WRC 2011 -
Japan Mitsubishi Lancer Evolution WRC 2001 2002
Lancer WRC 2004 2005
France Peugeot 206 WRC 1999 2003
307 WRC 2004 2005
Spain SEAT Córdoba WRC 1998 2000
Czech Republic Škoda Octavia WRC 1999 2003
Fabia WRC 2003 2005
Japan Subaru Impreza WRC 1997 2008
Japan Suzuki SX4 WRC 2007 2008
Japan Toyota Corolla WRC 1997 1999
Yaris WRC TBA TBA
Germany Volkswagen Polo R WRC 2013 -

References[edit]

  1. ^ "WRC History". Suzuki Sport. 
  2. ^ "Subaru Rally Engine – Developing a World Rally Car power plant", page 23-30, Race Engine Technology, issue 005, 2004
  3. ^ For instance, officially the Citroën DS3 WRC has 350 N·m (35.7 kgf·m) at 3,250rpm.
  4. ^ "Rally of Turkey 2010 – Glossary". Retrieved 2011-02-21. 
  5. ^ http://argent.fia.com/web/fia-public.nsf/92B8777DD7239078C1257802003B3157/$FILE/255A_2011.pdf

External links[edit]