TCS &/or VDC systems stays "On"; the only times to turn it off, I would say, is to purposely loose traction & do a quick spin burnout during test & tune or drift. I lost at-least .1 & 1-2 mph with it "Off" during my passes, my tires just didn't hook. My best times have been with TCS "On" & it includes in speed as well. You would probably need unholy skill or drag tires, in order to turn traction off & do better than with TCS "On". TCS/VDC is consistent for sport driving & is needed. You can turn it off, but you are going to need tires, or a major drop in tire pressure to compensate. The best track times with Z's are "On" & the Z will be consistently faster, which translates to staying in the race & finishing the race. Don't crash out.
I read somewhere that a magazine tester turned it off & scored .2 faster, but he probably rolled it out; I don't even mess with it off as passes require launching, not rolling. Maybe someone else might have more insight. Drive safe.
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