How does about 30-31 front and 39 rear sound?

 

Back down the rears.

 

There is a sticker on the inside of your drivers door with tire inflation guidelines. Start there.

 

It says 38 front, 46 rear

So I’m about 7-8 psi down on both!

 

29/32 is comfort spec. I generally set mine to 31/34 and put air in when it drops under 29/32.

 

33 Front / 38 Rear with the original Goodyear F1's on my C2S.

 

That's the MAXIUM recommended tire pressure, it's not the tire pressure that is best for: comfort, handling and/or durability.

 

What mine says. And as far as the “it’s a maximum” comment. Make sure you got the temperature reference correct too.

 

Here is how my PCM Shows the Tire Pressure selections that the program will track for functioning of the TPMS.
My Door Jamb Label only lists the absolute maximum pressure. Perhaps, different markets may require different labeling and driver options?
.

 

..

 

Having just gone 137 mph an hour ago, my 31/32 and 39 are a reasonable middle ground between comfort and speed

 

Tupper - I'm with you. My TT says 38 / 48 and I've been running 34 / 42 the last 500 miles. Its near brutal. Thinking of dropping down to 32 / 40 or 32 / 38.

 

Just remember if you change tires from stock to another tire, like P Zero s to MSC2, you can
forget the recommended tire pressures.

 

I think I need to lower mine to the comfort specs. Just got it from the dealer on Friday and didn't drive it much but with SPASM and our somewhat crappy roads every bump it felt worse than my 997 with PASM set to normal. I suspect they are too high and lowering will help.