World Rally Car#2017

File:Atkinson WRC Impreza in shop.jpg 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.{{citation needed|date=August 2022}} 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.{{citation needed|date=August 2022}} The maximum width was set at 1770 mm while front and rear tracks shouldn't exceed 1550 mm.{{citation needed|date=August 2022}}

Unlike the requirements for the preceding Group A cars, manufacturers were no longer required to build "homologation specials" in order to meet approval.{{citation needed|date=August 2022}} 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 airflow to about 10 cubic meters per minute.{{citation needed|date=August 2022}} The restriction was intended to limit power output to {{cvt|300|hp|disp=flip}} although some WRC engines were believed to produce around {{cvt|330|–|340|hp|disp=flip}}. {{Citation needed|date=April 2011}} 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 {{cvt|300|hp|disp=flip}} was available from 3000 rpm to the 7500 rpm maximum, with a peak of {{cvt|330|–|340|hp|disp=flip}} at around 5500 rpm.{{citation needed|date=August 2022}} At 2000 rpm (the engine idle speed in "stage" mode) power output was slightly above {{cvt|200|hp|disp=flip}}."Subaru Rally Engine – Developing a World Rally Car power plant", page 23-30, Race Engine Technology, issue 005, 2004

By 2004, the best cars had ABS, electronic clutch control, paddle-shift, traction control, three active differentials, ride height control with GPS, electronic dampers and active suspension.{{cite news|url=http://www.theinquirer.net/inquirer/feature/2115718/ford-technical-director-explains-low-tech-approach-wrc-cars|archive-url=https://web.archive.org/web/20111023221410/http://www.theinquirer.net/inquirer/feature/2115718/ford-technical-director-explains-low-tech-approach-wrc-cars|url-status=unfit|archive-date=October 23, 2011|title=Ford technical director explains low-tech approach in WRC cars|work=theinquirer.net|publisher=Incisive Business Media|date=2011}}

For 2005 the maximum width of the WRC cars was increased from 1770 mm to 1800 mm.{{cite web|url=http://www.mitsubishi-motors.com/motorsports/e/05wrc/car/index.html|title=Mitsubishi Lancer WRC05|publisher=Mitsubishi Motors|access-date=30 January 2018|archive-date=2 April 2015|archive-url=https://web.archive.org/web/20150402110635/http://www.mitsubishi-motors.com/motorsports/e/05wrc/car/index.html|url-status=dead}}

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.{{citation needed|date=August 2022}} 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.{{citation needed|date=August 2022}}

Starting in 2011, rules for WRC cars changed to be more restrictive. New regulations were derived from Super 2000 cars with a different aerodynamic kit. The cars could be smaller models (there was no longer a minimum 4 m length) and include a custom-build or production 1600 cm³ direct injection turbo-charged global race engine with a {{cvt|33|mm}} diameter air restrictor and a maximum boost pressure of {{cvt|2.5|bar|psi}} absolute.{{Cite web |title=Article 255A 2013 - Specific Regulations for Super 2000 (Rallies) / WRC |url=https://www.fia.com/sites/default/files/regulation/file/255A%20%2813-14%29_28.06.2013.pdf |publisher=FIA |publication-date=1 July 2013}}{{Cite web |title=Universal Machine - FIA In Motion |url=https://www.fia.com/sites/default/files/publication/file/in_motion_November2009.pdf |publisher=FIA |page=54 |publication-date=November 2009}} This limited torque to about {{cvt|400|N.m|lb.ft}} or lessFor instance, officially the Citroën DS3 WRC has {{convert|350|N.m|kgf.m lb.ft|1|abbr=on}} at 3,250rpm.).

Exotic materials (titanium, magnesium, ceramics and composite) were forbidden except when present in the base model. Carbon fibre and aramid fibre were 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 were allowed.

The gear changes must be made with a mechanical linkage system, so paddle-shifters were outlawed. However the system was re-allowed in 2015.{{citation needed|date=August 2022}} There was no center differential (earlier it used to be 3 differentials, with a center/3rd differential included), but the new regulation allows the only front and rear axle differential and a mechanical clutch to disconnect the rear axle during handbrake use (to reduce cost and make the cars' driving style more exciting again for both spectators and TV broadcasts). These two differentials 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{{Cite web

| title = Rally of Turkey 2010 – Glossary

| url = http://www.rallyofturkey.org/glossary.aspx

| access-date = 2011-02-21}}

{{citation needed|date=August 2022}}).

The minimum weight was 1200 kg empty and 1350 kg (1360 kg from 2013) with driver and co-driver (in both cases when measured with only one spare wheel).{{Cite web |title=Article 255A – 2011 Specific Regulations for Super 2000 (Rallies) / WRC |url=https://argent.fia.com/web/fia-public.nsf/92B8777DD7239078C1257802003B3157/$FILE/255A_2011.pdf |publisher=FIA |publication-date=11 November 2010}}

The 1.6 L turbo-charged global race 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 {{cvt|310|to|380|hp|disp=flip}}. The minimum empty vehicle weight was decreased by 10 kg but the combined vehicle, crew and spare wheel weight remained at 1360 kg.{{Cite web |title=SPECIFIC REGULATIONS FOR WRC CARS (WRC KIT VARIANT) |url=https://www.fia.com/sites/default/files/255a_2021_wmsc_2021.03.05.pdf |publisher=FIA |publication-date=17 March 2021}}

Manufacturers were given more freedom to maximise aerodynamic performance, including large brake cooling ducts in fairings forming enlarged wheel arches.{{Cite web |last=llluis555 |date=2017-02-17 |title=Aerodynamic features of 2017 WRC cars |url=https://www.wrcwings.tech/2017/02/17/aerodynamic-features-of-2017-wrc-cars/ |access-date=2022-09-12 |website=WRCWings |language=en-US}} Electronically controlled active centre differentials were permitted, while the front and rear differentials remain mechanical.

While 2011 specification World Rally Cars were allowed to compete in 2017, the new World Rally Cars were allowed for use by manufacturers' teams only.{{Cite web |title=2017 FIA World Rally Championship Sporting Regulations |url=http://juwra.com/images/regulations/2017WRCRegulations.pdf |publisher=FIA |page=13 |publication-date=3 February 2017}}

File:Xavier Pons.jpg|Citroën Xsara WRC

File:Petter Solberg (4785583959).jpg|Citroën C4 WRC

File:Al Qassami Baiao Rally de portugal 2016.jpg|Citroën DS3 WRC

File:C3 WRC in Monte Carlo - fotocredd Citroën Racing.jpg|Citroën C3 WRC

File:Ford Escort WRC (28505581320).jpg|Ford Escort WRC

File:Neste Oil Rally 2010 - Jari-Matti Latvala in shakedown.jpg|Ford Focus RS WRC

File:Mads Osberg 2 Baiao Rally de portugal 2016.jpg|Ford Fiesta RS WRC

File:Sábado 19, Rally de Portugal 2018 - 4.jpg|Ford Fiesta WRC

File:Ke hyundai.jpg|Hyundai Accent WRC

File:Chris Atkinson Rally Mexico 2014 002.jpg|Hyundai i20 WRC

File:2017 Rally Portugal - 5.jpg|Hyundai i20 Coupe WRC

File:Acr2011 336.jpg|Mini John Cooper Works WRC

File:Delecour, Rally Germany 2002.jpg|Mitsubishi Lancer Evolution WRC

File:Gilles Panizzi.jpg|Mitsubishi Lancer WRC

File:2003 Acropolis Rally 24.jpg|Peugeot 206 WRC

File:Marcus Grönholm - 2004 Monte Carlo Rally.jpg|Peugeot 307 WRC

File:SEAT Cordoba WRC.jpg|SEAT Córdoba WRC

File:Sb skoda.jpg|Škoda Octavia WRC

File:Jan Kopecký-2007 Wales Rally GB 001.jpg|Škoda Fabia WRC

File:Jari Ketomaa - Rally Finland 2009.JPG|Subaru Impreza WRC

File:Toni Gardemeister - 2008 Rallye Deutschland 3.jpg|Suzuki SX4 WRC

File:2015 Rally Bohemia - Jirovec, Toyota Corolla WRC.JPG|Toyota Corolla WRC

File:Ott Tänak in Toyota Yaris WRC of Toyota Gazoo Racing WRC Rallye Deutschland 2018.jpg|Toyota Yaris WRC

File:Sebastien Ogier Baiao Rally de portugal 2016.jpg|Volkswagen Polo R WRC

{{Reflist}}

{{Commons category|World Rally Cars}}

• [https://www.storiedirally.it/mitsubishi-lancer-wrc05-lultimo-acuto/ Storie di Rally]

• [https://www.storiedirally.it/world-rally-car-idee-semplici-e-geniali/ World Rally Car story]

{{World Rally Championship results}}

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Category:Rally groups

Category:World Rally Championship