To replace the Base Model 928, Porsche introduced a refreshed 928 S into the European market in the 1980 model year, and in 1983 for North America. Externally, the S wore new front and rear spoilers and sported wider wheels and tires than the older variant, but the main change for the 928 S was under the hood, where a revised 4.7L V8 engine was used. European versions debuted with 296 hp, and were upgraded to 306 hp for the 1984 model year. In 1985, North America received a new 5.0L 288hp 32-valve V8 engine equipped with Bosch LH-Jetronic injection. It became optional in other markets in 1986. Mid-year 1986 models (a/k/a 1986.5) incorporated the upgraded suspension and Brembo brakes found on later 928 S4 models. During its production, the 928S was available in either automatic or a 5-speed manual transmission. It evolved into the 928 S4 for model year 1987.