The Buick Regal T-Type and Grand National were recognized early on as future collectible cars, especially during a time when they were still rolling off production lines. By 1987, Buick had refined its turbocharged 231 cubic inch V6 engine to produce over 245 horsepower, a significant figure when compared to the era’s performance benchmarks. For context, a contemporary Chevrolet Camaro with a 305 cubic inch V8 and automatic transmission only managed a modest 190 horsepower. At the peak of this turbocharged lineage emerged the 1987 Buick Grand National Experimental, or GNX. This limited-edition model represented the zenith of the Turbo Buick development, embodying everything that made these cars exceptional and marking a fitting finale to the series.
The Making of a Legend: ASC McLaren and GNX Transformation
Buick produced a mere 547 Grand Nationals with specific interior features, then shipped them to American Specialty Cars (ASC) McLaren Performance Technologies for the exclusive GNX conversion. This transformation was extensive, involving a series of performance and handling upgrades designed to elevate the Grand National to an entirely new level.
The enhancements began with the engine, incorporating a Garrett T3 turbocharger featuring a ceramic impeller, complemented by a distinctive GNX heat shield. To improve cooling and power output, a larger capacity intercooler was installed. The engine management system was recalibrated to optimize performance with these new components. Handling was also a key focus, with the GNX receiving a performance suspension system that included a torque bar and a unique GNX-specific rear differential cover, all contributing to improved power delivery and road holding.
Performance Unleashed: Engine Specs and Acceleration
The heart of the GNX was its modified 3.8-liter V6 engine. While Buick conservatively rated it at 276 horsepower at 4,400 RPM and 360 lb-ft of torque at 3,000 RPM, independent tests often showed even higher figures. This power was channeled through a specially prepared Turbo-HydraMatic 2004R transmission, known for its robustness and performance capabilities.
This potent combination allowed the GNX to achieve remarkable acceleration for its time. It could launch from 0 to 60 MPH in under five seconds, and complete a quarter-mile sprint in the low 13-second range, figures that rivaled many contemporary sports cars and cemented its place in muscle car history.
Sinister Style and Rarity: Exterior and Collectibility
The GNX’s exterior styling was as distinctive as its performance. It featured functional vented fenders, a deliberate absence of hood and fender emblems for a cleaner, more aggressive look, and unique 16-inch aluminum mesh wheels with blacked-out faces and GNX center caps. These wheels were paired with high-performance Goodyear Eagle Gatorback tires, further enhancing its handling and visual appeal.
The example mentioned, GNX number 155 of only 547 produced, exemplifies the car’s collectibility. With an incredibly low 12 miles on the odometer and featuring original GNX-badged front carpet savers, a six-way power-adjustable driver’s seat, and the original ASC McLaren GNX window sticker, it represents a pristine piece of automotive history. This window sticker detailed all the exclusive features that distinguished this Turbo Buick as a Grand National Experimental, solidifying its status as a truly special and sought-after vehicle for collectors and enthusiasts alike. The Buick Grand National Gnx remains an icon, representing the pinnacle of Buick performance and a true testament to the muscle car era, reborn in the age of turbocharging.
