Egan, Jaguar chairman, was keen to put Jaguar back on the map after Jaguar was privatised in 1984 and felt that a return to sports-car racing would give Jaguar a much needed boost in international markets. As Bob Tullius' Group 44 initially ran Jaguar powered cars in IMSA, Jaguar partnered with both Group 44 (for IMSA) and TWR (for WSCC). However, it soon became clear that a single partner could successfully run in both WSCC and IMSA and so by 1988 TWR had secured the contract to run in both series. TWR Jaguar cars won the WSCC outright in 1987, 1988 and 1991 and won the prestigious 24 Hours of Le Mans and the 24 Hours of Daytona in 1988 and 1990. The series started in 1985 with XJR-6 (Group 44 used the XJR-5 and XJR-7), designed by Tony Southgate, with a chassis built from carbon-fibre and power provided by a highly tuned Jaguar V12 engine. This was followed by XJR-8, which won the WSCC Team's Championship in 1987, then XJR-9 which won the WSCC Team's Championship in 1988 and also secured victory at Le Mans the same year, returning in much the same form as the XJR-12 to win Le Mans again in 1990. TWR developed its own engine for the next series of cars, the XJR-10 (for IMSA) and XJR-11 (for WSCC) of 1989 and 1990, employing a 3.5 litre twin-turbocharged V6, which was capable of far more power than the V12 but was less suited to 24 hour racing (hence the XJR-12 being deployed at Le Mans and the 24 hours of Daytona). However, rule changes made the 3.5-litre turbocharged cars defunct within just one season of the WSCC and so TWR developed the all-new XJR-14 for 1991 – the first full car designed by Ross Brawn – for the final year of Jaguar racing in WSCC. Although this car won both the WSCC Drivers' and Teams' championship, Jaguar (along with almost all other manufacturers) decided that it no longer had any interest in WSCC due to unfair rule changes. For IMSA in 1991, TWR ran the XJR-16, a development of the XJR-10. In spite of six wins in fourteen races, TWR-Jaguar was placed second overall to the more consistent Nissan team. For IMSA in 1992, Jaguar's last season in sportscar racing, XJR-14 was brought to America, but lack of development to deal with tighter, bumpier US