Depending on where you look you will find many different 'stock quater mile times'. They simply vary so much, but from looking at a number of different sites, what I have below seems about right to me.
Generally speaking though, the 300zx is usually low 14's high 13's, with the r33 getting low to mid 14's. The 180 generally gets mid 14's and both the s14 and s15 usually get about mid to high 14's.
‘About the only thing that you could say is "better" about some is that the lighter ones (180SX, Silvia) will get more bang per buck from performance mods, because of lesser weight. The 300ZX being the heaviest obviously gets the least value from its mods, with the Skylines somewhere in the middle’
Yes, this is true but you are not factoring in engine size. Generally speaking a 2.5lt engine will produce more power per mod than a 2.0lt. So even though 300zx, skylines etc. are heavier than s13’s they would produce more power per mod and to an extent that would balance out the weight difference. The lighter car might still have the advantage, but it is more complicated than just weight…
Even if an s13 does respond better to mods than a 300zx, if you go mod for mod, it will take a lot of money for the s13 to catch the 300zx. So yeah, it may have better potential if you want to spend a lot of money, but most people do not modify their cars to those extremes. If you just go with the normal basic bolt ons the 300zx will remain faster.
Also, of course a 200sx is going to be more reliable than a r32. Think about it… a basically brand new car vs a car that will be reaching its 15th birthday soon. No matter how well the gtr was made, 10-15 years of thrashing will have a very large effect on a car.