Start with what the Jaguar XJR-11 is: a 2-door Coupé with 3.5 L 90 degree Jaguar JRV-6 Twin-Turbocharged V6, built from 1989 to 1990, in the age of turbocharging and the first electronic engine management. What it meant takes a little longer. The shape is credited to Tony Southgate for TWR.
The story
The Jaguar XJR-11 was a sports-prototype racing car introduced for the 1989 World Sports Prototype Championship, while its sister car the XJR-10 was introduced to compete in IMSA series races.
What is underneath
The engine is 3.5 L 90 degree Jaguar JRV-6 Twin-Turbocharged V6. On the scales it comes to 900 kg. Drive goes through a TWR 5-speed manual. The layout matters: the engine sits behind the driver and ahead of the rear axle, which puts the mass in the middle of the car and is why mid-engined cars change direction the way they do. These are manufacturer figures carried by Wikipedia and Wikidata, not road-test measurements.
Its place in the line
In the Jaguar line-up the Jaguar XJR-11 has a clear place: it replaced the Jaguar XJR-9; it handed the line to the Jaguar XJR-12 / Jaguar XJR-14 / Jaguar XJR-16. The cars a buyer would have weighed it against include the Subaru Legacy, the Mazda MX-5, the Lexus LS. Nearby in the Jaguar catalogue sit the F-Type and the Vanden Plas.
Owning one today
EPA combined economy is 21 mpg, about $4,450 a year in fuel at the EPA's assumptions. Condition, mileage and specification move any single car a long way from a headline figure.