1986 Porsche 928 Factory Custom 4-door Sedan

By the early 1970s, Porsche management decided that the 911 model would eventually have to be replaced by a more modern design. The new model would feature a water-cooled V8 front-mounted engine with its transmission and differential combined in a rearmounted transaxle for excellent weight distribution. The chassis featured all independent suspension and four-wheel disc brakes. The near equal weight distribution meant that the 928 would theoretically have far better straight-line stability than the 911 with its engine overhanging the rear axle.
In 1986 Porsche and AMG built the prototype pictured here-a custom 928 four-door sedan. One cannot help but conjecture that this variant may have been a prototype for a new 928 that would have created a completely new market niche, further distancing it from the 911.
According to current Porsche designer Harm LaGaay, this rare and unusual car was delivered to Heinz Prechter, founder and CEO of ASC (American Sunroof Corporation), whose large automotive aftermarket firm headquartered just south of Detroit enjoyed a close relationship with the factory. The workmanship of this conversion is impeccable, being the equal or better of the legendary fit and finish of a new Porsche. The entire cabin, for instance, is lined in sumptuous burgundy leather to match the exterior paintwork. Having recently enjoyed a tune-up and recharge of the air conditioning system, this intriguing 928 runs like a new car-as it should, since the odometer shows only 5,520 documented original miles.
The question is: Is this a sports car, a family sedan, or the world’s fastest limousine? Judging by its unique appearance and specifications, it likely qualifies as all of the above. What a marvelous way to elicit a double-take from all those snooty hotel concierges who think they know the world’s exotic cars.

Jim Schrager

Jim Schrager - SCM Contributor

Jim wrote for the 356 Registry and SCM for over a decade, was a Contributing Editor for Porsche Panorama (the magazine of the Porsche Club of America), and wrote for Excellence and the Porsche Market Letter. He has written two popular books on vintage Porsches: Buying, Driving, and Enjoying the Porsche 356; and Buying, Driving, and Enjoying the Early Porsche 911. He owns about 20 vintage Porsches, which he attempts to keep on the road through all kinds of weather. He is a clinical professor at the University of Chicago Booth School of Business, where he teaches a popular course on strategy. He actively races his family’s 41-foot sailboat with his two boys on Lake Michigan.

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