page_title: Ford Sierra RS Cosworth
section_title: Sierra RS500 Cosworth
hierarchical_section_title: Ford Sierra RS Cosworth / Sierra RS500 Cosworth
caption_attribution_description: English: Image showing 1987 Ford Sierra RS 500 Cosworth number (337 of 500) in the Trough of Bowland, Lancashire, England. Photo taken by Rupert C Kent and released into the Public Domain.
context_page_description: The Ford Sierra RS Cosworth is a high-performance version of the Ford Sierra that was built by Ford Europe from 1986 to 1992. It was the result of a Ford Motorsport project with the purpose of producing an outright winner for Group A racing in Europe.
context_section_description: Mike Moreton was head of the team that planned to develop an evolution edition aimed at making the car unbeatable on the race tracks. In March 1987, Aston Martin Tickford was signed for the job of converting the 500 cars.
  The Cosworth RS500 was announced in July 1987, and was homologated in August 1987.
  The main difference to the Sierra three-door Cosworth was Cosworth's uprated competition engine. Its new features were:
  The Inline-four engine had a thicker walled cylinder block to cope with the rigours of the track
  Bore X Stroke of 90.8 mm (3.57 in) X 77 mm (3.03 in)
  Displacement of 1,993 cc (2.0 L; 121.6 cu in)
  A larger Garrett AiResearch T04 turbocharger
  A larger air-air intercooler
  A second set of four Weber IW025 "yellow" fuel injectors and a second fuel rail (not activated in the roadgoing version)
  An uprated fuel pump
  A reworked induction system to allow higher power outputs to be realised
  An uprated oil and cooling system
  The rear semi-trailing arm beam had extended but unused mounting points
  Engine output increased to 227 PS (224 hp; 167 kW) at 6000 rpm
  Max. torque of 277 N⋅m (204 lb⋅ft) at 4500 rpm.
  The RS500 also had minor external cosmetic differences to its parent the Sierra three-door Cosworth:
  The rear tailgate had a lower spoiler in addition to the upper "whale tail"
  Discreet RS500 badges on the rear tailgate and front wings
  A redesigned front bumper and spoiler to aid cooling and air flow, including the removal of the fog lamps and their replacement with intake grilles to supplement brake cooling
  Exactly 500 RS500s were produced, all of them RHD for sale in the UK only - the biggest market for this kind of Ford car.  It was originally intended that all 500 would be black, but in actuality 56 white and 52 moonstone blue cars were produced.
  Some European tuners, missing a LHD RS500 version, have set up some elaborate versions of the Sierra RS Cosworth for private customers, replicating some of the RS500's specs. The most famous tuner dedicated to this project was Wolf Racing, who was already racing and winning as official team with the Sierra from 1986 through 1989 in the German touring car championship Deutsche Tourenwagen Masters.
  The official tuning kit for the engine included:
  Racing pistons
  Green injectors
  Bigger petrol pump
  Racing wastegate
  Electronic control chip
  Steel exhaust
  Concerning the aesthetics:
  Lowered sport suspensions
  16" wheels with gold alloys (BTTC racing version)
  RS500 original aero kit
  RS500 decals
  Tinting films on rear windows
  RS500 instrumentation with 300 km/h full-scale
  Additional integrated instrumentation in the central console
  Racing gear knob
  Sport pedals
  The declared power was 260 PS, although some owners claim at least 40 PS more. From 1986 through 1989 (nearly two years after the end of production of the first series), 10 street-legal RS500 replicas -in Ford's moonstone blue colour- were manufactured.
caption: Ford Sierra RS500 Cosworth
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