 This time, however, the rear wheels were additionally powered via the Torsen centre differential from the main engine compartment, which housed a 2.0-litre four-cylinder engine.Research and Development was advancing in the 1990s with projects such as the early BMW 5 Series (E34) CVT hybrid-electric vehicle  In 1992, Volvo ECC was developed by Volvo.The Volvo ECC was built on the Volvo 850 platform.