car based on the actual production XJ-S chassis and running gear. The team won the series' 1977 drivers' championship cup for Bob Tullius but missed winning the manufacturer's title by two points (only one Jaguar was competing in the Trans-Am series compared to many more Porsche entrants). In 1978, a purpose-built tube-frame "silhouette" style XJS race car was constructed which greatly reduced the weight compared to the full production chassis car campaigned in 1977. This silhouette car had only the production car's roof panel as the sole piece of factory XJS sheetmetal on the car. Group 44 succeeded in again capturing the driver's championship for Bob Tullius and also captured the manufacturer's title as well, by entering Brian Fuerstenau driving the 1977 car at some venues to gain additional manufacturer's points for Jaguar. The silhouette car survived and has surfaced recently in the SVRA historic sports race series. The 1977 factory chassis race car is believed to still be in the hands of Group 44's Bob Tullius. In April 1979 a Jaguar XJS driven by Dave Heinz and Dave Yarborough was entered into Cannonball Baker Sea-To-Shining-Sea Memorial Trophy Dash, widely known simply as the Cannonball Run. They completed the from New York to Los Angeles in a record time of 32 hours and 51 minutes, a record that stood for 4 years, until it was beaten by David Diem and Doug Turner in a Ferrari 308. Diem and Turner covered the same distance in 32 hours and 7 minutes on the US Express, an unofficial successor to the Cannonball Run. Tom Walkinshaw Racing In 1982 Tom Walkinshaw's TWR had entered a team of the V12 XJS' into the European Touring Car Championship, the cars built to the FIA's Group A touring car rules. The XJS won its first race that season when Walkinshaw and Chuck Nicholson won the XIV Grand Prix Brno, the cars simply proving too fast for their rival BMW 530/530i and Alfa Romeo GTV6 opposition with Walkinshaw qualifying 5.37 seconds faster than anyone else on the 10.925 km (6.789 mi) Brno Circuit. After more victories for the team's Jaguars in 1983 (including lapping the 20.81 km (12.93 mi) Nürburgring Nordschleife circuit in 7:56.00), the TWR Jaguars were the cars to beat in the ETCC, with Walkinshaw claiming the 1984 ETCC Drivers' Championship. During the championship season the TWR Jaguar team also won the prestigious Spa 24 Hours