Is anyone can tell me what would be calling
Solo II and Track days or HPDE but in Japan? Do they have a similar competition events?

Thank you

Closest thing I've seen is gymkhana...

http://c-racing.web.infoseek.co.jp/index2.html

Fairly similar, though they tend to use fewer cones and more 180degree+ turns :)

Japanese gymkhana's are much tighter then our AX's ... which is why they use stiffer springs in front then in back ... because they do very late braking and handbrake turns ... stiffer springs in back makes the rear end skip instead of only slide ... this according to the japanese U.S. Tein development engineer

... he couldn't understand why we wanted stiffer springs in back until he saw one of our SCCA Solo2 events ...

Thanks for info guys. Anybody has any idea about HPDE/ OPen Track