From July 1981, the XJ-S was renamed the XJ-S HE and received the new High-Efficiency V12 engine for much better fuel economy. In 1983, the new 3.6-litre Jaguar AJ6 straight-six (I6) engine was introduced along with a new convertible model called the XJ-SC. The coupé's rather small rear seats were removed in order to make space for the removable soft top, making it a 2-seat car. In 1988 a special high performance XJR-S version equipped with the 5.3 litres (5,344 cc) HE V12 engine was produced by the newly formed JaguarSport.