In August 1980 (for the 1981 model year), the Supra received an upgrade in displacement with the 2,759 cc (2.759 L; 168.4 cu in) 5M-E engine. It was still a 12-valve SOHC engine, but made 116 hp (87 kW) and 145 lb·ft (197 N·m) of torque. The car's automatic transmission was changed to the revised Toyota A43D and it gained a revised final drive gearing. Because of the change in engine and transmission they dubbed a new chassis code of MA47. In the final year of the Mark I Supra, it achieved a 0–60 mph time of 10.24 seconds and finished the 1/4 mile in 17.5 seconds at 77.7 mph (125.0 km/h).
Also in 1980 (for the 1981 model year), a new Sports Performance Package became an option, which included sport suspension, raised white letter tires, and front and rear spoilers. This also marked the last year that an 8-track tape player was offered in any Supra.
Source: Wikipedia, 2014