I think it's about 20-25 in rain for me, and 25-30 in the dry for simple power oversteer, no clutch kicking/slipping. :

: My front tires are pretty good but my rears are oooold. Not bald but old, so it's pretty easy to get them to slide. This is just my experience.
**edit** this is for fairly sharp corners though, not wide ones. I'm talking autocross style corners**