The Ford Sierra RS Cosworth which was introduced in 1986 was
a created as a homologation
special to allow the car to compete in the Group A rally series.
The Sierra RS Cosworth shared little with the standard Sierra.
Under the heavily modified body Ford's performance division
had replaced the drivetrain from end to end. Powering the RS
Cosworth was a 2.0 litre, turbocharged, four-cylinder
engine which made 204 horsepower - with the potential to develop
many more. This was coupled to a 5-speed, close-ratio manual
transmission driving the rear wheels through a limited slip
differential. To bring the Sierra RS Cosworth to a stop it employed
anti-lock brakes with massive discs and four piston calipers.
The handling of the Ford Sierra RS Cosworth was superb thanks
to stiff suspension, sturdy anti-roll bars, large alloy wheels
and of course the limited slip differential. The massive downforce
generated by the 'whale tail' rear spoiler further aided the
In total just over 6,000 Ford Sierra RS Cosworths were produced.
There were also 500 special edition Sierra Cosworth Evolution
RS500 models manufactured. These were fitted with an even larger
rear wing, and an engine developing 20 horsepower more.