Please can some one give me an indication on tyre pressures on a track day.

Car is a MK Indy Aprilia (approx 475kg) running 13 inch wheels. I've just bought some Dunlop slicks.
I was running Toyo R888 at 16 PSI. Front tyres 185/60/13 and rear 205/60/13.
Just wondered if I should be running lower pressures on slicks?

Thanks

Rob

Mine gain around 4psi when hot, so I start at around 12psi before venturing out.