Porsche introduced a refreshed 928 S into the European market in 1980, although it was summer of 1982 and 1983 model year before the model reached 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 4.7 L engine was used. European versions debuted with 300 PS (221 kW/297 hp), and were upgraded to 310 PS (228 kW/306 hp) for the 1984 model year. From 1984 to 1986 ROW (Rest Of the World) S model was officially called S2 in UK. North American spec 1983 and 1984 S models used, among other differences, milder camshafts and additional emissions regulation equipment, and were limited to 239 hp (174 kW/242 PS) as a result.
As the faster S model was not available in the USA and Canada during the first three years of its existence, a "Competition Group" option was created to allow North American customers to have an S model lookalike with spoilers, 16" flat disc wheels, sport seats, sport springs and Bilstein shocks. Customers could specify paint and interior colors the same way as on a normal 928. The package was available in the 1981 and 1982 model years and was cancelled in 1983 when the S model became available for these markets. Many cars have had S features added by subsequent owners, making original "Competition Group" cars difficult to distinguish without checking option codes.
In 1982, two special models were available for different markets. 205 "Weissach Edition" cars were sold in North America. Unusual features were champagne gold metallic paint, matching brushed gold flat disc wheels, two-tone leather interior, a plaque containing the production number on the dash and the extremely collectible three-piece Porsche luggage set. It's believed these cars were not made with S spoilers even though these were available in USA during this time period as part of the "Competition Group" option. The "Weissach Edition" option was also available for the US market 911 in 1980 and 924 in 1981 model years.
140 special "50th Jubilee" 928 S models were available outside the USA and Canada to celebrate the company's 50 year existence as a car manufacturer. This model is also sometimes referred to as the "Ferry Porsche Edition" because his signature was embroidered into the front seats. It was painted meteor metallic and fitted with flat disc wheels, wine red leather and special striped fabric seat centers. Similar 911 and 924 specials were also made for ROW markets.
Porsche updated the North American 928 S for 1985, replacing the 4.7 L, SOHC engine with a new 5.0 L, DOHC unit sporting four valves per cylinder and producing 288 hp (215 kW/292 PS). Seats were also updated to a new style. These cars are sometimes unofficially called S3 to distinguish them from 16-valve S models. European models kept a 4.7 L engine, which was slightly more powerful, as standard; a little detuned 32-valve engine together with catalytic converters became an option in some European countries and Australia for 1986. That same year, revised suspension settings, larger brakes with 4-piston calipers and modified exhaust was installed on the 928 S, marking the final changes to old body style cars. ROW models received these changes at beginning of model year while North American cars got them only after close to 900 cars were made, starting from VIN 1001. North American version of this late 1986 model is sometimes referred as S3.5 or S3½ because of these changes. The name is little misleading as more than 2/3 of 1986 North American model production had these updates.
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