Ford developed the Escort RS Cosworth around the chassis and mechanicals of the Sierra Cosworth, adapting the larger engine and transmission into the Escort bodyshell. Only the front doors and roof are interchangeable with a standard fifth-generation Escort; the rest of the bodyshell was substantially different. The floor pan of the regular Escort was designed for front-wheel drive only, requiring extensive reworking to accommodate permanent four-wheel drive with a 34/66 front-rear torque split via an uprated five-speed gearbox from the Sierra Cosworth.
The project was guided by Rod Mansfield and John Wheeler of Ford's SVO department. Styling was completed in 1989 by Stephen Harper at MGA Developments in Coventry, a year before the standard Escort launched. The aerokit — front and rear spoilers — was also designed by MGA with Wheeler's oversight, while chassis tuning was handled by John Bull and Mick Kelly. Production took place at Karmann's facility in Rheine, Germany.
Two main turbocharger configurations were used across production. The first 2,500 units — completed by January 1993 to fulfil FIA Group A homologation requirements — used a Garrett T3/T04B hybrid turbocharger with an air-water intercooler. These cars also included a non-functioning water injection system fitted beneath the rear passenger seat, required to demonstrate water injection capability under Group A regulations.
Due to high consumer demand Ford continued building the large-turbo specification until June 1994, well beyond the homologation threshold. From June 1994 a revised model entered production using a smaller Garrett T25 turbocharger, a Ford EEC IV engine management system replacing the original Weber-Marelli IAW P8, and individual coil-on-plug ignition. Peak power was reduced by 5 PS but drivability improved for road use. Standard top speed was 150 mph, comparable to the Audi Coupe S2, BMW M3, Nissan 300ZX, and Toyota Supra. Tuning companies have subsequently extracted over 1,000 bhp from the platform.
Three trim levels were available: Motorsport Base (stripped for easy competition preparation, 40 kg lighter, including the 937 seam-welded Motorsport Shell 909 variants), Standard, and Lux (adding air conditioning, leather seats, and electric sunroof). Production ended in early 1996 when the model could not meet new EU drive-by noise regulations.
The Escort RS Cosworth made its World Championship debut at the 1993 Monte Carlo Rally. Francois Delecour and Miki Biasion ran first and second until the final night, when Didier Auriol's Toyota Celica overtook them to win. Ford won at Portugal — Delecour leading from the start — and again in Corsica and Greece (Biasion's first win in three years), putting both drivers at the top of the standings and Ford level in the manufacturers' championship. Toyota ultimately won the manufacturers' title through Juha Kankkunen's victories in the second half of the season. Privately entered Italian driver Franco Cunico won the San Remo Rally in an Escort RS Cosworth, the first privateer to win at WRC level in several years, outpacing the works Lancia Delta Integrale of reigning World Champion Carlos Sainz.
Delecour won the Monte Carlo Rally but retired in Portugal with engine failure and was then injured in a road accident, missing four rounds. The works team filled with a succession of substitute drivers; results were indifferent except when Tommi Makinen won the 1000 Lakes Rally on a one-off drive. Biasion, whose relationship with the team had deteriorated, finished third in Portugal before departing at season's end. Budgetary pressure from simultaneous Formula One and BTCC commitments led Ford to close its Boreham works team at the end of 1994.
The programme was handed to Belgian team RAS Sport, with a shortened calendar and more limited service support. Group A cars also ran with a smaller turbo restrictor that disadvantaged the Escort's seven-speed gearbox. Delecour finished second at Monte Carlo; Bruno Thiry led the Corsica Rally before a wheel bearing failure — which mechanics could not repair under the new service rules — removed him. Ford finished at the bottom of the manufacturers' championship.
Ford took the rally operation back in-house for 1996, with Carlos Sainz replacing Delecour. Sainz won in Indonesia and took second in Sweden and Italy, finishing third in the drivers' championship. The Escort was by then outclassed by Mitsubishi and Makinen, and development attention shifted to incoming World Rally Car regulations.
Ford obtained special dispensation to convert the Escort to World Rally Car specification for 1997, serving as a stopgap before a purpose-built WRC car. The semi-trailing-arm rear suspension was replaced with MacPherson struts, bodywork was modified, and the programme was transferred to Malcolm Wilson's operation, now known as M-Sport. Sainz won two further rallies under WRC rules in 1997 and 1998. The Escort name bowed out of works rallying after a double podium at the 1998 Rally of Great Britain, with Sainz and Juha Kankkunen taking the final works results.
The car won numerous national and European championships throughout its career, including Belgian, British, Italian, German, French, Portuguese, Austrian, and other national titles across 1993 to 1998. Pierre-Cesar Baroni won the 1993 European Rally Championship and Patrick Snijers took the 1994 title, both in Escort RS Cosworths.
The Escort RS Cosworth was also campaigned in rallycross, where competition versions were frequently tuned beyond 600 bhp and capable of 0-60 mph in roughly 2.5 to 3 seconds. It appeared in circuit racing in events including the Belcar Historic Cup and the Nurburgring. In 1992, before its homologation was complete, the car was used as a Formula One Safety Car in two Grands Prix to trial the concept that would be formally introduced in 1993.
The Escort RS Cosworth sits alongside the Subaru Impreza and Mitsubishi Lancer Evolution as one of the definitive turbocharged all-wheel-drive performance cars of the 1990s. Though it never won the World Championship for manufacturers, its ten WRC victories, private success at national and European level, and status as a class-leading road car make it one of the most celebrated products of the Ford Motorsport programme. Its influence on subsequent road car performance engineering — particularly in turbocharged all-wheel-drive packaging — remains substantial.
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