So I have read many of the posts regarding tire pressure for tracks, etc... but I have not read a post regarding the best tire pressure for street driving.

I want to know what the optimal pressure would be to increase the life of your tires and without increasing the chance of a blowout.

I have Nitto NT-555 -> 235/35/19 and 275/30/19 respectively.

Currently my TPMS shows 34F/34R when cold and goes up to around 40F/40R when warm during normal driving. Is this too high or is where it should be for what I want?

I've always heard run the max that the tire manufacturer specs for the tire - that's supposed to give you the best life...but it can be noisier, harsher ride, and not optimal for grip.

So do you think 40psi around (warm) is okay?

Any advice guys?

If you check the sticker in the drivers side door, it will give you the optimum tire pressure to have for everyday use. TPMS will fluctuate so that is more of a guideline. Always check your cold tire pressures with a hand held gauge and set it to the manufacture spec found in the door sill.

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Meet my Mistress...
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My Porsche Cars

2007 Cayman S
2006 Cayenne S Titanium Edition
1982 944 (Amoung first shipment to come to US; number 6 off the boat)

I haven't changed the tire pressure since picking mine up from the dealer, but I am curious to what others are using for street driving pressures.

Currently my tire pressure is setup as follows:

Cold
34 Front
36 Rear

after about 10 mins of spirited driving
Warm
36-38 Front
40-42 Rear

Also of note I have the Michelin Pilot Sports equipped on 19" wheels.

Cold
32 Front
35 Rear

after about 10 mins of spirited driving

Warm
34 Front
40 Rear

I have the Bridgestone RE050A equipped on 18" wheels.

I decreased the cold rear a bit (34 vs. 37) since I noticed it would goto 42-43 warm (probably due to the heat next to the engine back there?).

For the front I've been experimenting a bit to increase PSI to see if I feel a difference, but I haven't really felt anything. I'll probably go back to the 30 PSI cold and keep an eye on how the tire shoulders are wearing.

Interested in hearing other opinions and hopefully learning something!

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Pete

2008 Meteor Grey CS, PASM, Chrono, Sport Seats, Sport Shifter, Sport steering wheel, Xenon, Fire Extinguisher, Auto Climate and clear bra!

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In case the door sticker is like owners manuals the sticker on my '08 w/ 18" wheels states 30 front and 37 rear.

Not sure why but the TPC seems to consistently be about 2 psi lower then a manual gage reading. Supposedly the TPC is temp compenstated so maybe it's playing mind games.

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Les

Ya, I just got a gauge today and it the sensors show 2psi lower then the gauge. In any case, I feel comfortable running around 38psi F (warm) / 40psi R (warm)