Jack F

As others have said, when you pick comfort 20” summer, then go into differential screen, it will tell you what to set at. That would be a good place to start.

mangu

+1

991.2 Targa GTS, drove 3 summer & 3 winters, at dealer pressures 35F/45R, before learning about tire pressure and testing to my taste.

Totally different car now. Ultimately, Run comfort setting w/ cold pressures 29/33. Even on my winter PA4 tires (no comfort setting on winter tires, just partial load, but still at comfort pressures).

Even when keeping comfort setting on, I do inflate to cold pressures of 32/36 (in both summer and winter), when I will have my teenage passenger and 2 smaller children in the back seat (which is more inline with the partial load PSI).

thesaintusa

Like @Big Swole and @mangu

I like how my 991.2 GTS drives/feels with cold temps of 29/32. Operating temps settle around 32-33 F and 35-36 rears. EVEN wear. But this is for the P Zeros.

mangu

I run my Michelin Summer and Winter tires the same way.

991_T

I'll try these pressures net time out for a cruise and Track Day, on a cold morning at the Track I started out with 32F & 38R did five laps and then checked pressures 44F & 48R lowered pressure to 36F & 38R while hot, next session 5 laps mid morning came in checked 48F & 51R after power sliding on all 4's in the hair pins LOL

Big Swole

Yup!! lol. For the track, you have to start quite low for sure!

thesaintusa

I was starting in high 20s and settling out at 33/35 and required bleeding of air for sessions.

I can imagine the car wanting to slide with pressures in mid 40s
.

991_T

It was my first Time Trial weekend solo so I'd had no baseline to start from or anyone else to make recommendations, now I know lol.
I will say that coming years of a dirt surface experience and then hitting asphalt the sliding part came natural and was a blast but really put a toll on the tires

eidde

If I run comfort settings I get an error at high speeds, car wants 36/44. half load setting

asellus

What error, and what speeds?

Big Swole

If you don't know, you are going fast enough! lol

It's an audible message and display "Low Tire Pressure" or something similar at very high speeds. I get it on the drag strip during a 130-140 mph pass due to lowering pressure for grip.

asellus

Aha, makes sense. I err on the side of not committing felonies.

Big Swole

Yes, unless you’re going to the strip and track, you probably won’t ever see it then.