The BMW Z1 is a two-seat roadster produced from July 1988 to June 1991. The Z1 featured unusual doors which, instead of opening outward or upward, dropped down into the door sills. Only 8,000 copies of the Z1 were produced.
In 1988, however, BMW was quoted as saying that they had 35,000 orders for Z1s. The BMW Z1 was designed over a three-year period by an in-house division of BMW Technik GmbH. The development of the Z1 is attributed to Dr. Ulrich Bez, not to forget the core of his team at BMW Technik GmbH (Alexander Pregl, Rudolf Müller, Lutz Janssen, Wolf-Henryk Menke, Dieter Schaffner, Klaus Faust, Sabine Zemelka and Stephan Stark). Control of the project was turned over to Dr. Klaus Faust when Bez left for Porsche in October, 1988. BMW considered building an all-wheel drive model but this was later scrapped.
The BMW Z1 was used to develop and debut several technologies. Z1 designer Harm Lagaay mentioned that Z1 production helped generate patents for BMW's high-intensity discharge lamp, integrated roll-bar, door mechanism, and underbody tray.Source: Wikipedia.