I think the correct pressure should be 29psi all round if you are running standard 16inch wheels. I have a 2.8 and run the 225/50/16 tyres at 30 Front 32 Rear which seems to work.Cheers Tony and Slam,
Did the tyres yesterday and put 32 psi front and 34 psi rear - this was just what the previous owner had scrawled on the manual.
The recommended tyre pressure will be shown on the drivers door frame.