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
* 1 Regulations
* 1.1 1997–2010 * 1.2 2011–2016 * 1.3 2017
* 2 Cars * 3 References * 4 External links
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 , modified suspension layout and attachment points, aerodynamic body modifications, weight reduction to a minimum of 1230 kg and chassis strengthening for greater rigidity.
Unlike the requirements for the preceding
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 limit power output to 300 hp although some WRC engines were believed to produce around 330–340 hp. 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.
By 2004, the best cars had ABS, clutch control, paddle shift, traction control, three active differentials, ride height control with GPS, electronic dampers and active suspension.
In an attempt to cut costs, since 2006 new regulations required mechanical front and rear differentials, while the central differential remained active. Active suspension and water injections were also prohibited. Cars entered by a manufacturer had to be equipped with the same engine for two rallies; further limitations were imposed on the changing of some parts, including suspension, steering, turbochargers and gearboxes.
Starting in 2011, rules for WRC cars changed to be more restrictive.
Now regulations were derived from
Exotic materials (titanium , magnesium , ceramics and composite )
were forbidden except when present in the base model.
The gear changes must be made with a mechanical system, so the paddle shifters were not allowed. However the system was re-allowed in 2015 . There was 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), and they must be mechanical, without electronic control or hydraulic or viscous systems (from 2006 to 2010 the center differential and previously all three could be active ). Minimum weight is 1200 kg empty and 1350 kg with driver and co-driver (in both cases with only one spare wheel ).
The 1.6 L turbo-charged engine was retained in the 2017 World Rally Car regulations, but the turbo restrictor diameter was increased from 33 mm to 36 mm, increasing the engine's power output from 310 bhp (223.7 kW) to 380 bhp (283.4 kW). Minimum vehicle weight was decreased by 25 kg.
Manufacturers are also given more freedom to maximise aerodynamic performance, large brake cooling ducts in fairings forming enlarged wheel arches, and are allowed to use electronically-controlled active centre differentials, while the front and rear differentials remain mechanical.
While 2011 specification World Rally Cars will be allowed to compete in 2017, the new World Rally Cars are allowed for use by manufacturers' teams only.
MANUFACTURER CAR FROM TO
C4 WRC 2007 2010
DS3 WRC 2011 2016
C3 WRC 2017 -
/ Ford Escort WRC 1997 1998
Focus RS WRC 1999 2010
Fiesta RS WRC 2011 2016
Fiesta WRC 2017 -
Hyundai Accent WRC 2000 2003
i20 WRC 2014 2016
i20 Coupe WRC 2017 -
MINI John Cooper Works WRC 2011 2012
Mitsubishi Lancer Evolution WRC 2001 2002
Lancer WRC 2004 2005
307 WRC 2004 2005
Škoda Octavia WRC 1999 2003
Fabia WRC 2003 2005
Yaris WRC 2017 -
* ^ "WRC History".