STLPCA

I've been happy w/34F - 36R (approx 2.3 - 2.4) for my 18" tires. Go higher if you prefer better gas mileage & tire life over better handling & ride quality.
Experiment to find out what you like for the way you drive - one size does not fit all.

BTW, thiis has been discussed many, many times.

gst

I just came back from different tyre pressure trials, perfect ride and handling for 18' turbo twist, 34 F, 36 R, both with tyres up to working temp.

OldGuy

As Dan says experiment find out what you like. I do this even in my truck. But in my TT with 18"
235s in front and 295s in back I found also that 34 in front and 36 in back gave me about
40psi after a 20-30 minute session on the track which is what I told is the best temps for the tires
I was using-PZeros aysmetricos.