As title suggests i am wondering what sort of tyre pressures i should be running with 17's and CEC on a trackday

20 all round as a starting point then go from there depending on over / under steer and which other factors can be adjusted easily....

Would those pressures still apply on bling wheels as in this case though Ben?

20psi may be Ok but Im not sure as most very low profile tyres require more pressure than something like a 60 profile tyre which will be a lot more compliant.