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Modèles Jaguar

 Jaguar XJR 5


(1980-1984)




La Jaguar  XJR 5 fut produite de 1980 à 1984
1 motorisation est sur Histomobile d'une cylindrée de 5.3L présentant une puissance de 530ch.


Jaguar XJR 5 

From 1984 through 1993, Jaguar backed teams in both the World Sportscar Championship Group C and the IMSA Camel GTP competition with their Jaguar XJR Sportscar. The history of the project dates back to the early 1980s with Bob Tullius. He formed the Group 44 racing team in the early 1960s with partner Brian Feurstenau and campaigned his Jaguar E-Types for the following two decades. He also played a part with the Howmet gas turbine-engined LeMans car of 1968, which he drove in the 24-Hour race.

The Jaguar XJR-5 was designed primarily for competition in the IMSA's GTP class. Tullius was able to persuade Mike Dale of Jaguar Cars Inc. in New Jersey to fund this project. Designer Lee Dykstra was tasked with creating a car that could accept a Jaguar V12 racing engine. Group 44's previous four cars were the XJR 1 through 4. This new prototype racer was called the Jaguar XJR-5.
Dykstra used the twelve-cylinder engine as a stressed member of the chassis and bolted it directly to the aluminum monocoque. Four stiffening struts were bolted to the racers firewall and the rear suspension completed the ensemble. The monocoque chassis had honeycomb floor sections and tubular-reinforced steel bulkheads. Underneath the car was reserved for aerodynamics, of which Dykstra was an expert at designing and incorporating. Venturi tunnels extended from the flat-bottomed cockpit to the rear and exited beneath the full-width rear wing. The body was constructed of carbon fiber and Kevlar composite.
Aerodynamics and ground effects had gained in popularity. Lotus was one of the first to prove the benefits of ground effects and reducing the air pressure under the car. Low air-pressure was used to keep the car planted firmly on the track. The resulting design of the JXR-5 was put through tremendous testing in the Williams wind tunnel. After fine-tuning the design, two cars were produced. The first was a car that was intended for high speeds track, and had low drag and low downforce. The second car had high downforce and aimed at slower tracks. Testing at Summit Point began as early as June of 1982. A few months later, the car made its racing debut at Road America and was driven by Bob Tullius and Bill Adams. Two Porsche 935's secured the first two positions, but the XJR-5 manage to crack the top three and a class win the GTP class. The following races were not as fruitful for the car. Its first race victory came the following year, at the Road Atlanta 500km race. The car continued to compete, but was never a major contender for the championship.

Dykstra had continued the development of the XJR Sport Cars design. By 1985, a completely new car had been drawn. The 5.3-liter engine had grown in 1984 to a full six-liters and the twelve-cylinder engine was now using Lucas/Micos engine management systems.
Derek Bell tested one of the Group 44 team's XJR-5 car at Silverstone in 1983. Bell was pleased with the car and excited for its potential. This report stimulated Jaguar to back the Group 44's effort in competing at the LeMans 24 Hour endurance race. It had been twenty-two years since Jaguar competed at LeMans. Lancia and Porsche were too fast; the two Jaguar XJR 5s ran for fourteen hours before retiring from the race. They had been sitting in sixth and seventh position. The cars would return to LeMans, but a 13th overall and a win the GTP Category would be their best showing. 1985 would be Tullius's final racing appearance at LeMans.

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