they went up to late 1993 or early 1994 from memory. There were 3 series' which ended with the RB25DE model. Pretty much followed the same lineage as the R32 skyline, which isn't surprising. All A31's almost have an equivalent R32 model, drivetrain and engine wise.
Wait till I get back to melb and I'll do you a writeup of all the different models, features and shizzle.