Opel chose to name its 1986 replacement car in this segment Omega rather than Rekord. Vauxhall stayed with the Carlton name. On its launch at the end of 1986 the Vauxhall Carlton / Opel Omega saloon and estate range earned itself the accolade of European Car of the Year.
In 1990, Vauxhall launched a high performance 377 bhp (281 kW) Lotus Carlton in collaboration with Lotus Cars. (An Opel version was also produced as the Lotus Omega.) It was built with a 3615 cc six-cylinder twin-turbo engine (designated C36GET) capable of over 176 mph (283 km/h), making it officially (for the time) the fastest full four-seater that had ever been made. It cost £48,000 – well over double the price of a standard Carlton. As a result, Vauxhall's original plans to sell about 1,000 in the UK ended in 440 UK cars being sold. For those with less money there was the 3000GSi 24v, with a top speed of 146 mph (235 km/h).
Source: Wikipedia (original)