Honda first adopted the Si badge for the Japanese domestic market (JDM) third-generation Civic in November 1984. Mainly offered in hatchback form, the main aesthetic difference for the Si was a slight bulge in the hood, which accommodated the taller DOHC engine. A four-door sedan variant also existed in Japan, but was only produced in small numbers and is rare. Designated as ZC1 in Japan and D16A1 in Europe, the new engine put out , enabling the car to reach a top speed of and go from 0–60 mph in 8.9 seconds. This was fairly powerful at the time, on par with its hot hatch competitors.
