maybe I did

what is recommended track tire pressure for the stock pirelli?

 

Also looks to me possibly overinflated.

Auto Motor und Sport for their 991.2 C2S Supertest here with OEM PZero N1 used F/R 2.0/2.2 bar (warm) on Nürburgring and 2.0/2.3 bar (warm) on Hockenheim short course. These are about 29/32 psi and 29/33 psi. I am using these for both autocross and backroads on my 991.2 C2 MT. So far seems OK wear and handling wise.

 

yes, that was the problem

i was running 35/40 cold

what do they mean by warm?

 

When measured coming off the track presumably after a short cool-down.

 

Well, there's the problem

"Warm" as in pressure when the tires are at track temps - you can try and measure this as soon as you come off from a session. I leave the pits around 26/27psi cold, target 31-32psi hot, and bleed down throughout the day to maintain target pressure.

I would go with street tires like the michelin ps4s until you get to the point where you're really melting the tires. MPSC2 will cost more and wear faster than street tires if you don't have a good handle on your alignment and tire pressures....

 

Thanks for all the help, that was the problem

last question, can I flip the tires, from left to right?

as most of the turns on the track I run are to the right, and only the left tires got that uneven wear

thanks for the info

 

Yep you can flip the Pzero's side to side to even wear.
They have an inside and outside but are not directional.

Agree too high a pressure, wear should be worse on the outside edge rather than on a internal band.

 

thanks to all of you

should have checked here about the track tire pressure before heading to the track

 

I've been wondering about this topic as well but more from a what are the best street tires offering a combination of grip and longevity.

A PZero Trofeo R will offer a ton of grip but it isn't really considered a street tire despite being street legal.

Apparently the new PZero Corsa is great choice for the street.

 

Wow..way too much pressure even for street use cold psi. Hot,psi,you want to be around 32 front 35 rear max Hot psi for a street tire at the track.

 

I'd love to read this test...but it's in German. Anyway you know of to transcribe to English?

Thanks!

 

Porsche 911 Carrera S (991.2) im Supertest - AUTO MOTOR UND SPORT English

 

Car control & autocross today. 991.2 C2 MT, factory alignment, OEM PZero N1. My target was 29 psi warm, but my mistake I let it get to 33 psi.

 

Guys - unless you are using a tire pyrometer and measuring your tire temps coming off the track - you're just guessing at pressures and anyone that has a lot of track time knows it.

Here's how you do it :

 

I agree that street Michelins tend to wear better. I ran 2 track days - a total of 4.5 hours of track time - and only scrubbed maybe 20% of my tire tread.

I also had to bleed 10 psi of pressure throughout the day due to temps increasing after every event. I'd set pressures to 2psi below stock and then come in after 30 mins and check pressures, which showed +1 or +2. By not bleeding pressures, besides overinflation, you risk getting pressures up to the max recommended tire pressure - nearly 50 psi on many tire brands, which could actually be a safety issue.