Proper tire inflation

[maddie288]

I have a 2025 Turbo with all Michelin Pilot All Season 21" tires. The tire pressure plate on the door says 45/psi Front and Rear. However, in My Porsche app it shows at 45, the tires are over inflated by +2psi each. I know there is a partial load setting in the menu, but that didn't seem to make a difference. Any thoughts?

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[sloubere]

I believe the pressure on the door sticker is for full load. You can view the partial load recommended pressure in the user manual.

 

[RunningOnSolar]

Mine show 44 +3 psi each with exception of front left at 42 +3 psi. Apparently this indicates the amount over the recommended pressure. I would only worry if the pressures were considerably more out of tolerance and/or you were stressing the car such as heavy towing or using it on the track.

Pressures also tend to vary somewhat based on temperature. i don’t know if you’re in north, central or southern Ohio, but there has been quite a variation in temperature, at least in the southern part recently

 

[Doggo]

Use the pcm to tell you exactly what it should be. It takes amb temp into account. +- should be 0.

 

[Barry41561]

Use the pcm to tell you exactly what it should be. It takes amb temp into account. +- should be 0.

Thanks for this...

So, I'm now rather confused: I've always used the doorjam for proper pressure (for my 20' Summer tires it indicates 41 psi).
The Porsche app shows that the tire pressure should be 35 psi!

Am I truly to rely on the Porsche app?

 

[RunningOnSolar]

I asked the question of my dealer service and they told me they tend to slightly overfill tires to avoid tire pressure warnings, hence the +3 in my case. However, do what makes you most comfortable and consider the amount of temperature variation you exp to deal with

 

[Doggo]

Thanks for this...

So, I'm now rather confused: I've always used the doorjam for proper pressure (for my 20' Summer tires it indicates 41 psi).
The Porsche app shows that the tire pressure should be 35 psi!

Am I truly to rely on the Porsche app?

The manual also tells you, but will tell you it's for a static 22c or similar (forget exactly). Door jam doesn't have an amb temp

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