hmm, comparing the 'sports' models of the Nissans of the similar era...
I'll try and compare three models. The Pintara TR-X, the Skyline Silhouette, and the Pulsar Vector SSS, all 1990 models, all manuals, all stock.
Pintara:
2.4L
96kW
189Nm
12.88kg/kW
1236kg
Skyline:
3.0L
114kW
247Nm
12.19kg/kW
1390kg
Pulsar:
1.8L
79kW
151Nm
1030kg
13.04kg/kW
now, judging by those figures alone, the Skyline would be fastest. However, there are plenty other factors to consider:
traction: the Skyline is RWD, hence would have more power losses, yet harder to lose traction.
torque: the RB30 has more torque than the KA24 and the Family II (naturally)
However, the Pulsar has a higher diff ratio than the other two (4.167), so off the mark, it would probably be quicker than the other two, despite it's power/weight.
Of course, it depends on the driver, but I would think, to be fair, a Pulsar of similar era (N13), should be included, see which Nissan is fastest. I like the looks of the TR/X, I like the power of the R31, and the Pulsar ain't a bad little car either. I would prefer the R31 as a daily driver however, as I prefer larger cars.