Recently we have been discussing the origins of the Citroën XM.
Here are as many of the influences I can find, not counting the aspects of the car that draw on Citroen’s own general heritage. The roll call is long and not exclusive. However, it begins with the 1974 Lotus Eclat which has a similar dropped window line, one of the XM’s signature features. Deschamp’s drawing looks like a saloon Eclat, if you compare the two. The 1979 Bertone Tundra offers the angular surface treatment which characterises the XM. The 1980 Lancia Medusa has a long wheel base and a very similar raked window screen and bonnet, another Citroen XM feature. The glazing is conventional though.
Two cars provide inspiration for the way the windscreen wraps to the side glass. First, the 1980 Ferrari Pinin shows the wraparound effect and, second, the 1982 GM Aero shows the small triangular glass panels needed to allow the side glass to wind down (later used on Buick and Oldsmobile C-platform models in 1991). In between is the overlooked 1981 Opel Tech concept car which has a floating roof which depends on glazed A, B and C-D pillars.
In the same year Bertone’s Mazda MX-81 (by Marc Deschamps) shows the same surface treatment as the Tundra and particularly the distinctive groove down the body side as it relates to the wheel arches. Marc Deschamp’s XM sketch is from October 1984. The 1985 Subaru XT appeared in February 1985 and it may only be a coincidence but it has many of the same elements as the XM. Its authorship is not clear: I suggest an uncredited Bertone project for an XM coupe, finalised in 1982. I have shown a 1986 car.
I am not aware of a car that has so many clear influences in its final form as the XM. The 1982 Citroen BX must be noted as direct influence in that it was this car the XM had to relate to in the Citroen portfolio. The BX is credited to Gandini. An abbreviated chain of influences runs from Bertone (the Tundra and MX-81), to Gandini (BX) and on to Deschamps at Bertone again. The final car was then polished by Olson and Abrahamson.
Perhaps the 1981 Talbot Tagora, on which Art Blakeslee worked might even be included?
1982 GM Aero concept car (YouTube.com)
1984 Citroen XM sketch by Marc Deschamps in Martinez, A., and Sauzay, M (1989) Citroen XM. EPA, Paris.