alex_c

Yesterday I got my Porsche Connect code added to my Carrera T at the dealer, and all the remote services are working fine, BUT one of the screens is a little confusing.

I verified that the tire pressure was correct according to the door sticker, at 35 PSI front and 45 PSI back. Then drove around and the PCM displayed the exact same values on the screen.

BUT, when checking the status of the vehicle using the app, it shows like they are overinflated by +3 in the front and +7 in the back. Why is that? What PSI value was the app expecting to see on the tires?
My gauge matches what is on the PCM which matches what is on the door. Also I checked and the tire size is correct on the PCM Settings screen. I also DE-selected the "Comfort Press" (comfort pressure setting, which should be lower) and also de-selected the "Max Load" option. Shouldn't that selection match the door sticker?

Here is the screenshot from the app:

Al.Fresco

Door sticker recommendation is non-comfort, max load.

seanhaus

OKB

the pressure goes up when the tires get hot

Penn4S

If you have 245's and 295's the pressure you are running is too high. I run 31 f and 35 r on my TTS with 245 and 305. In the warm weather under driving conditions they will heat up and gain 3-5 lbs of pressure.
The car will ride and handle better with the lower pressures.

ipse dixit

Is this thread a reverse Mensa test in disguise?

alex_c

Thank you all!

I do have 245 / 305 on the T.

I'll be trying 31/35 as suggested and report back. That seems to be the recommended pressure on the manual for partial load.

fueledbymetal

Negative Ghost Rider - you want 31 37 cold on stock summer tires on the T. It's in the owners manual.

alex_c

Since the owners manual indicates that the cold pressure is at around 68 degrees, and it was about 80 in Houston, I adjusted to 33 / 39 to test.

During my drive to the airport this morning it felt A LOT smoother than before. And either the lack of traffic and ambient noise at 4 am made a difference or the tires were less noisy.

I'm glad I asked. For some reason I didn't realize that the user's manual has two sections about the tires. One on page 269 where it says to follow the door sticker for tire pressure, BUT there is also a full table of fire pressure options on page 360. I haven't seen that one, hence my question.

And looks like I'm a 0 now (well, all but one soon to be adjusted...)




Thank you for tour feedback!

chuckbdc

Tire pressure readings are a major entertainment center on today's 911s. Porsche will soon have charts that correlate display live and analyze after individual tire pressures to ambient air temperature, G forces, MPH, transmission mode, fuel load, PSE mode, time of day, attitude and longitude, weather and traffic conditions, daylight savings time and Rennlist participation.

Homeles

fueledbymetal

I didn't realize that at first either. I too am used the info being on the door placard, but when I saw how high the values were there I knew they couldn't be right.

GrantG

chuckbdc

Thanks for the links GrantG.

That is way better that a bud with a pyrometer in the pits. My serious track days are over, but, like PDK, SPASM, and PSE, this technology looks indespensable!

Integrate some more of the bits from sensors already on board and we are on the way!