The Buick Regal T-Type and Grand National models emerged as distinctive vehicles during their time, quickly recognized as future collectibles even when brand new. By 1987, the turbocharged 231 CI V6 engine within these machines was generating over 245 horsepower, significantly outpacing a contemporary stock 305 CI V8 in an automatic-equipped Camaro, which produced a mere 190 horsepower. The pinnacle of this performance lineage arrived in 1987 with the Grand National Experimental, or GNX—a limited-edition, meticulously engineered model that represented the ultimate iteration of the turbo Buick legacy.
Buick produced only 547 Grand National cars with specific interior features before sending them to American Specialty Cars (ASC) McLaren Performance Technologies for the transformative GNX enhancements. These upgrades included a Garrett T3 turbocharger equipped with a ceramic impeller and a dedicated GNX heat shield, a larger intercooler for improved cooling, and a recalibrated engine management system. Performance suspension enhancements, featuring a torque bar and a unique GNX rear differential cover, were also implemented. The 3.8L V6 engine in the GNX was conservatively rated at 276 horsepower at 4,400 RPM and 360 lb-ft of torque at 3,000 RPM, paired with a modified Turbo-HydraMatic 2004R transmission.
The GNX delivered impressive acceleration, launching from 0 to 60 MPH in under five seconds and completing a quarter-mile in the low 13-second range. Its menacing exterior was characterized by vented fenders, a deliberate absence of hood and fender emblems, and distinctive 16-inch aluminum mesh wheels. These black-out faced wheels, adorned with GNX center caps, were fitted with Goodyear Eagle Gatorback tires.
One particular unrestored GNX, identified as number 155 of the “Fourtunate Few” production run of 547 units, showcases an incredibly low 12 miles on its odometer, as indicated by its special instrumentation package. This vehicle is equipped with GNX-badged front carpet savers, a six-way power-adjustable driver’s seat, and the original ASC McLaren GNX window sticker, which itemizes all the exclusive features that define this turbocharged Buick as a Grand National Experimental.
In conclusion, the Grand National Buick GNX stands as a testament to Buick’s engineering prowess in the 1980s, representing the zenith of their turbocharged performance vehicles and solidifying its place as a highly sought-after collectible.
