Is your bike stretched or does it have any serious power adders?
Stock wheel base, you probably wont need to play around much with the pressure just because its more likely that the bike will wheelie than it will spin.
Stretched will depend on track prep. The better the prep, the more air you can run. At my local 1/8mi the prep is pretty good and I had no problem hooking up with my 190/55 Pilot Power @35psi when I was stretched 6" over, -1/+5 gearing and lowered/strapped.
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