Page "Porsche 928" Paragraph 20

Porsche introduced a refreshed 928 S into the European market in 1979 model year, although it was summer of 1982 and MY 1983 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 1984 model year, though it is rumored proven on chassis dynamometers that they typically made around 330 hp.

From 1984 to 1986, the ROW ( Rest of World ) S model was called S2 in UK.

These cars used Bosch LH-Jetronic fuel injection and purely electronic Bosch ignition, the same systems used on the later 32-valve cars, though without the pollution controls.

North American-spec 1983 and 1984 S models used, among other differences, smaller valves, milder camshafts, narrower intake manifolds, and additional pollution equipment in order to meet emissions regulations, and were limited to 234 hp ( 174 kW / 230 PS ) as a result.