The Jaguar R4 was used during the 2003 Formula One season and driven by Mark Antônio Pizzonia and Justin Wilson.

At the end of the 2002 season, Eddie Irvine was out of contract and took the opportunity to retire from Formula One. Pedro de la Rosa was negotiated out of his standing contract. New drivers were added and the who management team was restructured.

The R4 was a new design and was completely restructured when compared to the old R3. It was given a stiffer chassis and much testing on the track and in the laboratories was done to weed out any potential problems.

The car was powered by a Cosworth CR5 V10 engine and mated to a Jaguar seven-speed magnesium-cased semi-automatic gearbox.

The R4 earned 18 points and gave the Jaguar team a seventh place finish in the World Constructors Championship.

by Dan Vaughan