i set a goal for the year time wise for a particular track, but i work on 1 thing at a time and 1 turn at a time,
1 session ill dedicate to braking as late as possible 1 turn at a time,
then another session ill dedicate to putting on as much power as possible as early as posibble during track out
then another for proper turn in points etc etc
then the last couple of sessions ill try and tie it all together and usually im a bit faster...
next year ill be working on cornerspeed, i really need cornerspeed, one of my buds is a racer, and hes followed me around and told me that i have about 2-3 seconds safely in cornerspeed ( in otherwords im a bitch in the corners),
which would put me at a decent 1:58 at tws
But i would still not say you need a system right away , because just riding around the fast guys and getting lots of seat time will make you faster by itself,