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In 1984 the Grand National returned in all black paint. The turbocharged 3.8 L became standard and was refined with sequential fuel injection, distributor-less computer controlled ignition, and boasted 200 hp (150 kW) at 4400 rpm and 300 lb·ft (407 N·m) of torque at 2400 rpm. Only 5,204 Turbo Regals were produced that year, only 2000 of which were Grand Nationals. Because this was the first year production of the computer controlled Sequential Fuel Injection and Distributor-less ignition, this is often considered the year/model that started the development of the legendary intercooled Grand Nationals. The performance of this package was well ahead of its time and the “Little V6” easily kept up with the bigger V8’s.
Quarter mile (~400 m) performance was listed at 15.9 seconds at stock boost levels of 15 psi (1.0 bar), while for the same year, the Chevrolet Camaro was listed at 17.0 and the Chevrolet Corvette at 15.1 seconds. Soon, performance enthusiasts determined the modifications that worked and the Grand Nationals easily broke into the 13-second territory. All Grand Nationals for this year had the Lear Siegler-made cloth/leather interior which was only available for this year. An estimated 200 of the 1984 Grand Nationals were produced with the T-Top option which makes these the rarest of the Grand Nationals.
Source: Wikipedia (original)