What tire pressure are you running in the cooler weather, (5-15 Degrees C)?

Recommended pressure is 36 PSI front, 44 rear. Should I leave as is?

Thanks.

 

You need to add air as temps drop. Your TPMS should help you with this.

Figure about 1 PSI per 10 degree F outside temperature change, for dry air.

 

That seems to be the performance pressure setting. There's a comfort setting option (and you need to adjust the PCM for comfort if you go this route) - 32F / 34R. Not sure where you live or what the roads are like, but here in northern NJ, and also in NYC where the roads are less than optimal, comfort setting makes the ride much more bearable. In the colder weather I up this to 34f/36r.

 

With your sises you better keep to the performance settings.
Low Aspect ratio tires ( your 30 and 35 in the sises) are calculated to high in their maximum load by the tire-makers, and so when you calculate the needed pressure, the pressures will be to low.

To calculate a save lowest pressure I need to know the real loads on the seperate tires , but axle loads can do.
Also need the maximum speed you ever drive, and mostly for back tires the camber angle ( tires like this on the axle /=\ ).
If you can give empty weight of car and the way you load it ( persons and lugage) and if motor is in front or back ( probably front), I can estimate the axle loads .
If you want advice the car-maker gives I need the GAWR's ( gross axle weight ratings).

My prediction is that the advice-pressures will be high .

but for the cold weather the tires need the same measured pressure as when its warm outside. the temperature in the tire rises about 27 degr C when driving. Probably you measure lower becouse they where filled at a temperature of 18 dgr C and at 5 degrees the pressure dropped a little from 18 to 5 when you measure.

You can play with my pressurecalculationwithtemp-spreadsheet in next map, on my skydrive from hotmail adress with same username as here.
https://skydrive.live.com/?cid=a526e...E092E6DC%21793
To use it first download it by RIGHT-CLICKING and choose download.
After download and eventual virus check, open it in Excell or open office calc on your computer.
use part 2 for it and try some temperature differences out.

 

Been playing around with pressures lately, been running 35/38 and its a good balance.

 

Check the owner's manual. I suspect they went silly high for higher mileage ratings. As mentioned before, the manual has "comfort" settings which are muuuuch nicer in terms of ride quality with very little difference in handling. I ended up going up only slightly - ( 32/36 ) from the comfort settings.

 

I'm happy with the ride at 31 front and 34 rear. I tried higher pressures and didn't like it at all.

 

These are all quite a bit lower than mine. Dealer put 36 front/44 rear when I picked it up.

 

Good thread.

I just increased the pressure to 36/42 (reading the door sticker, I didn't want to go all the way to 44 on the rears) and find it a bit rough. The dealer had 2-4 PSI lower. Around 32/40. I think I will go back to something lower, even if it will result in excess wear on the tires. With the roads being what they are in S Florida, I am afraid the rougher ride will result in all kinds of interior items coming loose.

What mileage are we expecting from these tires? I can't wait to drive it to a track for a few laps (nothing crazy, just a few fun laps) once it will be time to replace them.

 

I would expect about 10,000 for the rears. Twice that for the front. No PDCC.

 

I ride with 32 front and 35 rear. The door sticker ratings are for safety if you are running with a full load and at high speeds. Makes for a terrible and darty ride. It is only in the manual that Porsche offers different inflation options.

 

I run 33 F, 36 R cold. They typically get to 35 F 38 R in normal driving, and a pound or two more when pushing. After 17k miles they are wearing well. The fronts should go another 5k, the rears another 3k. With winter approaching I might jump to Michelin SuperSport AS3if they are available. A friend with an AudiS6 finds them to be outstanding.

 

Lowest allowed according to European manual is 32 f and 39,5 b. I'm running 33 & 40.

 

I would expect that European manual would show higher pressure due to availability of higher speeds especially on the Autobahn. North American manual gives settings for the high mph possibility also. I use the comfort settings approx. 32# and 35#.

 

Once again, I am glad I've found this thread otherwise I would have never looked at the manual for pressure. I always just look at the door. So 36/44 is for full load. Good to know. I guess that would be 4 people? I doubt I can talk anyone into occupying those rear seats.

I dialed it down to 33/36. I don't think I will go above 165 mph anytime soon in the USA. Unfortunately…

edit: By the way, I use my own little gauge to measure the tire pressure, and have my own pump at home. So I went and set 33/36, but on the TPM it shows 30/36. Kind of weird. The rear TPM values agree with the gauge, but the front values don't.