The late 1980s witnessed a renaissance in American automotive performance, and leading the charge were the Buick Regal T-Type and Grand National. These turbocharged marvels quickly became recognized as future classics, even while still available fresh from the dealership. In 1987, Buick’s turbocharged 231 cubic inch V6 engine was producing over 245 horsepower, significantly outperforming the era’s standard 305 cubic inch V8 found in automatic Camaros, which delivered a mere 190 horsepower. However, the pinnacle of this turbocharged lineage arrived in 1987 with the Grand National Experimental, better known as the Gnx Car. This limited-edition vehicle represented the ultimate evolution and a fitting finale, embodying everything that made the turbo Buicks so exceptional.
Buick produced only 547 vehicles with Grand National interiors, specifically for transformation into the GNX. These cars were then shipped to American Specialty Cars (ASC) McLaren Performance Technologies to undergo the extensive GNX modifications. The enhancements were substantial, including a Garrett T3 turbocharger equipped with a ceramic impeller and a unique GNX heat shield, a larger, more efficient intercooler, recalibrated engine management systems, and a performance-tuned suspension featuring a torque bar and a GNX-exclusive rear differential cover. Despite these significant upgrades, the 3.8L V6 engine in the gnx car was conservatively rated at 276 horsepower at 4,400 RPM and a robust 360 lb-ft of torque at 3,000 RPM. This power was channeled through a meticulously prepared Turbo-HydraMatic 2004R transmission, ensuring optimal performance.
The result of these modifications was breathtaking performance. The GNX car could accelerate from 0 to 60 MPH in under five seconds and conquer the quarter-mile in the low 13-second range, figures that were remarkable for the time and remain impressive today. Visually, the GNX was just as striking as its performance. The exterior featured distinctive vented fenders, a deliberate absence of hood and fender emblems, 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, completing the aggressive stance.
One particular gnx car, number 155 of the limited run of 547, stands as a testament to the model’s exclusivity and desirability. This unrestored example boasts an incredibly low 12 miles on its odometer, showcased by its special instrumentation package. The vehicle is also equipped with GNX-badged front carpet savers, a six-way power-adjustable driver’s seat, and the original ASC McLaren GNX window sticker. This window sticker details all the unique features that distinguish this turbo Buick as a true Grand National Experimental, solidifying its place as a highly sought-after collectible and a true icon in automotive history.
