i have them on 17" Z33 rims. 235/50 and 225/50 respectively. right now i'm running 36psi. should i be running them lower when it snows hard?

FYI, i have LM25 on, 225/40, 245/40, both 19", and i'm running 33psi front and 37 rear.

According to the owners manual, when using 17 inch rims, the pressure should be 30 psi.

I had been using 30 psi in my 17 inch Pirelli SnowSport 210s, and the center of the tires was wearing slightly faster than the edges. This year I'm using 28 psi. That should give slightly better traction in the bad weather, and the tires should wear evenly.

i think you can check on the manufacturers website for proper inflation

I ran 33psi front and rear in my Coupe with 17" winters. It was fine.
I wouldn't go harder than that because you'll lose contact patch.
G/L
C.