Jaguar XJR-9

Lore & Background

An evolution of the design for the XJR-8, the XJR-9 was designed by Tony Southgate, built by Tom Walkinshaw Racing (TWR) and featured a Jaguar 7.0-litre V12 engine based on the production 5.3-litre engine as used in the Jaguar XJS road car. A variant of the XJR-9, the XJR-9LM, would be developed specifically for the 24 Hours of Le Mans where the requirement for high straight line speeds on the Mulsanne Straight necessitated a low-drag aerodynamic package. In the United States, the Castrol sponsored XJR-9s debuted at the 24 Hours of Daytona, with the car taking the overall win. However, throughout the rest of the IMSA Camel GTP season the XJR-9 was unable to gain another win until the final race of the season, meaning the team had to settle for third in the constructor's championship. In the 1988 World Sports Prototype Championship, the XJR-9, running Silk Cut sponsorship, met with more success. The XJR-9 was able to take six victories, including the 24 Hours of Le Mans, over the eleven race series. Silk Cut Jaguar won the Teams Championship and Jaguar driver Martin Brundle won the Drivers title. Jaguar's success at Le Mans marked the first time since 1980 that Porsche had not won Le Mans, and the first Le Mans victory for Jaguar since 1957. For 1989, the XJR-9 was again entered in both IMSA Camel GTP and the World Sports Prototype Championship. However, the XJR-9 was by now dated, and in IMSA was being repeatedly beaten by Nissan, leaving the XJR-9 with only a single win on the season. This led to Jaguar introducing the XJR-10 midway through the season, which met with slightly better success having two wins on the season and usually placing higher than the XJR-9 it ran with. At the end of the season, Jaguar finished 2nd in the championship. A similar story occurred in the 1989 World Sports Prototype Championship, with Jaguar not winning a single race during the series. Midway through the championship, the XJR-11 was developed to replace the XJR-9, although both finished out the season. This disappointment led to Jaguar finishing fourth in the Teams Championship. Within months of Jaguar's 1988 Le Mans victory, TWR would use the XJR-9 chassis for the development of the R9R prototype which by 1990 had evolved into the XJR-15 sports car and spec-racer. In 2010, the car won the Le Mans Legend race.

In Their Own Story

The sun dipped below the horizon at the Mulsanne Straight, casting long shadows over the tarmac. Inside the cockpit, Johnny Dumfries gripped the wheel, the roar of the twin-turbo V12 vibrating through his gloves as he pushed the XJR-9 to its limit. The air was thick with the scent of burning rubber and high-octane fuel. A Porsche 962C flashed past in the mirror, but Dumfries held the line, knowing that endurance was a war of attrition. As the car thundered through the Esses, the engine's distinctive growl echoed off the grandstands, a sound that had been silent at Le Mans for too long, now roaring back to claim its throne.

Reader's Guide

The XJR-9 features a 60 degree SOHC 24 valve V12 engine, mid-mounted longitudinally. Displacement is 6,995 cc (427 cu in) for the World Sports Prototype Championship and 5,996 cc (366 cu in) for IMSA GTP. Bore is 94 mm (3.7 in), stroke 84 mm (3.3 in), compression 12:1. It uses Zytek fuel injection and is naturally aspirated, producing 750 hp (760 PS; 559 kW) at 7,200 rpm and 828 N⋅m (611 lb⋅ft) at 5,500 rpm. The body is carbon composite, the chassis is carbon fibre and Kevlar monocoque. Front suspension uses double wishbones with push-rod activated coil springs over dampers; rear suspension uses magnesium uprights with titanium coil springs over dampers. Steering is rack and pinion power steering. Brakes are TWR ventilated discs. Transmission is a March/TWR 5-speed manual. Layout is rear-wheel drive. Power to weight ratio is 0.85 bhp/kg. Top speed is 245 mph (394 km/h).

Did You Know?

• The XJR-9's engine is naturally aspirated, not twin-turbocharged.
• The XJR-9 won the 24 Hours of Le Mans only once, in 1988.
• The winning drivers at Le Mans in 1988 were Jan Lammers, Johnny Dumfries, and Andy Wallace.
• The XJR-9 debuted at the 24 Hours of Daytona in 1988 and won that race overall.