Nissan Skyline R31

The R31 Skyline introduced many new technologies and features. The HR31 was the first Skyline to be equipped with the new RB-series of engines. The R31 RB engines are often referred to as "Red Top" engines because of the red cam covers. There were three variants. The earliest series of DOHC RB engines used the NICS (Nissan Induction Control System) injection system with 12 very small intake runners, and a butterfly system to divide the intake ports in half for better low RPM performance. Later versions used ECCS (Electronically Concentrated Control System) engine management, discarded the twelve tiny runners for six much larger ones (though they retained twelve ports on the head, so there was a splitter plate), and received a slightly larger turbocharger. Nissan's RD28, a 2.8 straight-6 engine, featured for a diesel option. Another technological first for the R31 was the introduction of Nissan's proprietary 4-wheel steering system, dubbed HICAS (High Capacity Active Steering). The R31 series were also the only models in the Skyline family to feature a 4-door hardtop variation. These models were generally badged as the Passage GT.

The R31 Skyline was also produced in Australia, with a 3.0 L motor (RB30E) available in sedan or wagon form, as well as a four-cylinder version called the Nissan Pintara. The wagon had the same front style as the coupe and sedan—the only difference being that it lacked the four round brake lights that had been a consistent element of Skyline design (except for the R31 series one/two which had rectangular taillights with a solid bar through the centre which was also shared by the Pintara). These cars were manufactured in Australia due to the heavy import laws which made it expensive to bring cars into Australia.

Also called	7th SKYLINE(1985–1987)
Production	1985–1989 309,716 units sold
Assembly	Musashimurayama, Japan
Body style	4-door sedan 4-door hardtop 2-door coupe 4-door station wagon
Layout	FR layout
Engine	1.8 L CA18I I4 2.0 L CA20E I4 2.0 L RB20E I6 2.0 L RB20ET I6 2.0 L RB20DE I6 2.0 L RB20DET I6 2.0 L RB20DET-R I6 3.0 L RB30E I6 2.8 L Diesel RD28 I6

Source: Wikipedia