Pretty useful thread here. Here's a pic of me at my local kart track entering the tight hairpin-like coner near the spectator area. I'm not sure where my faster stuff is but if you look for "Aidan Kayrooz" in the sprints section of gazpix you should find the few I'm thinking about (this years stuff though as I've only stated doing the sprints this year).
At the time the car had 175\70 r13's and 185\70 13's with standard clapped out rear shocks and just the Stanza struts with standard replacement shocks and I'll call it "stage one" lowered king springs.
Now the rear end is sporting some shortened Hilux shocks or something and I'm in the search for some nice grippy 13's to go on the hustlers' as they're all worn pretty bad now(probly due to the shotty psi I had in them for years. I ended up lowering it from 38 to 30 to 26 psi all round but 23-5 would probly be better for them.

http://datsun1200.com/modules/myalbum/photo.php?lid=12885&full=1