Been there too, 39 PSI for 17....Do I need more?

I think a lot of it is down to preference once you are set around the optimal pressure for a given situation (eg track or road driving). It depends on the tyre, its profile, the car and also your preference! Like Kato said, changing the differene between front and rear CAN yeild different results in terms of how the rear end feels. It's all about finding the results you want.

Personally I have run around 36 in both tyres for the road (i have Fuldar 225/35/R18). When it's time for hard slogs, it goes to about 40 in F+R. I still need to expeiment with the difference in changig the front and rear pressures. But i do know that lower pressures on the back for our AWD Subies can make them slide out more than if they were more the same pressure.

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Sliding, ooo...kinda miss the old days when the back keep sliding. That is 1 interesting setup. Anyone else care to share their setup experience?

I've always run mine on 36-38 for street use, tends to want to slide out & gets too much sidewall flex on fast corners on 32psi but mine are Bridgie 205/50/16.

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Beaten up old 98 Gen 2 Liberty, 13.0, stock V3 STI running gear.
07 Transit motor home
69 VF & 70 VG Valiants needing full restoration
Yamaha Zooma 50cc rocket hopefully going with the Transit.