I own a Fiat 500 Abarth, they are front heavy cars and the stock tires are (Pirelli Pzero) 205/40/17. The door sticker recommends 38psi front and 32 psi rear. I recently started doing track days and the stock setup was completely useless. Those tires are crap and I just couldn't hold my line.
I got rid of that junk and got myself some Enkei RPF1 wheels with some Hankook RS3 tires size 225/45/15 and the improvement was huge and instantly. I shaved off 10 lbs per wheel and the grip is excellent, but could improve some.
Not knowing where to start with tire pressures, I used 30psi front and 32 psi rear. It worked out good but after 10 minutes the front started to get hot and greasy. After the 20-minute track session i immediately checked tire pressures again. The rear went up maybe 10% to 35psi but the front had gone up to 43psi. I'm told that the RS3's need to be no more than 38psi for optimal grip.
Where should I start next time? Some guys tell me I should start with 34psi front to end up at 38psi. Others tell me that I should start at around 25-26psi which seems awfully low to me, especially with the manufacturer's reccomendations to use 6psi more in the front vs rear. What do you experts think?