The original MX5 came with a 1.6 L (98 cu in) dual overhead cam inline four-cylinder engine, producing 90 kW (120 bhp) at 6,500rpm, and 136 N·m (100 lbf·ft) of torque at 5,500rpm. The engine employs an electronic fuel injection system using a vane-type air flow meter and a camshaft angle sensor instead of a distributor. This engine, codename B61P, had been previously used in the 323 series. Standard transmission was 5-speed manual. Japan and the USA got an optional automatic transmission which proved unpopular; these markets also received an optional viscous limited slip rear differential, although were only available for cars with a manual transmission. To achieve the low introductory price, the base model was stripped. It had steel wheels, manual steering, roll-up windows, and no stereo or AC. Power steering, AC, and stereo were added as standard equipment in later years.
The NA could reach 60 mph (97 km/h) in 9.4 seconds and had a top speed of 190 km/h (120 mph). This first generation of Miata (often referred to as the NA) included a special edition in 1991, produced in British Racing Green with the first use of tan interior.
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