Yesterday I found this video of an AA63 sedan racing on Suzuka circuit (west course). The engine is probably almost bone stock with a few small modifications like an open airfilter.

He does a quite good run but then runs into some slower (probably pit out) Hakosuka Skylines and then gets passed by a very quick 280ZX. Quite fun to see him trying to chase the 280ZX for some time but then he gets engine trouble.

You can hear around 4:12 some metal sound in the engine note and the driver probably broke something in the engine. Also in the comments it states that the engine broke, but it doesn’t say exactly what broke. He then tails the Ken-meri and another Hakosuka Skyline and when he enters the pit lane he immediately leaves the track.