Rocketpencil posted some new racing videos on Youtube including this 1984 Suzuka 1000km endurance race! These endurance races were always the main event for the so called Granchan races (Grand Championship) where a lot of mixed groups were racing at the same event. The Super Silhouette (Group 5) races were mostly a (short) prequel to the main event.
In this video you can see some of the Super Silhouette cars at 0:46, the Nissan Silvia Turbo and a Mazda RX7.
During the main event you can also see a few cars from a different group riding along: some Nissan Sunny B210s, Toyota Corolla Levin AE86s, Honda Civics, Mazda RX7s, a Toyota Starlet KP61, a Honda Ballade CRX and a Honda Prelude SN!