Buick introduced the Grand National in 1982 as an appearance package for the Regal. By 1984, it had evolved into a more formidable vehicle with a black exterior, upgraded suspension, aluminum wheels, and a turbocharged V-6 engine. Buick’s chief engineer, Dave Sharpe, aimed to create a special car to mark the end of the Grand National line as it transitioned to a new front-wheel-drive design in 1988.
To develop the GNX (Grand National Experiment), Buick collaborated with ASC McLaren, known for their production of Buick’s turbocharged V-6 Indycar engines. The GNX featured a high-performance Garrett turbo, improved intercooler, revised engine management, enhanced transmission, and a free-flow exhaust system.
With over 275 horsepower, 360 pound-feet of torque, and additional aesthetic upgrades like black lace alloy wheels, larger tires, rear-axle torque arms with a Panhard bar, and functional front fender vents reminiscent of classic Buicks, the GNX combined performance enhancements with luxury amenities. Its popularity led Buick to produce 547 units, surpassing the original plan of 200 due to high demand.
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