just saw this thread (was away o/s for 3 weeks lol)
ok, so just read first page so sorry if I have missed posts, a few scotch and cokes and cbf reading much now hehehehe
when I first bought my r33, it was 100% standard. I did a couple of track days in it, modded it, did more, modded it, did more!
I got to a point where it was nicely modded and I didnt want to leave it anywhere. it was my only car. I bought an r31 for 2k and kept the r33 in the garage. drove it on weekends. felt good.
by this time I had a fair amount of track time under my belt and wanted to get into more supersprints and eventually racing. i weighed it up, the r33 was just too costly to mod more and go quicker, so I sold it!
bought the mx5.
as others have said, they are lighter and underpowered and will teach you more.
the mx5 is registered, but also aasa and cams log booked. theres an mx5 racing series. fairly light which means a commodore v6 can tow it
cheap on tyres, fuel, spares, everything.
2009 I did 14 or so trackdays. my last race meet at OP GP I killed cyl 4.
I have a blueblird as my daily and within a month or two will be buying a VX berlina, so that will be the tow car to wakefield and maybe interstate rounds.
my advice now, do more track days in your n/a supra. Harry said to upgrade pads and suspension. TBH thats all you need to do to get out there! (and make sure the car is safe)
do that for a while and see where you want to go and race,
Cheers!