I went on a great Roads and Rails trip with PCA last weekend and while pushing it a little on the dragon and some other twisties I noticed some slight tire squealing. Someone in the group recommended lowering the tire pressure slightly, and I wondered if any of you knew the optimum front and rear pressures for nb 19in Super Sports. Thanks in advanced for any help.

 

Subscribed.
Many thanks,
=L=

 

My experience is to keep the pressure in the rear around below 44 PSI hot.

What I usually do, set the pressure in the morning to 33/39 before drive to the track, as soon as I get there, lower it to 33/39, and then monitor during the day to keep the pressure hot, between 33/39 and 37/44... I think that's the sweet spot.

 

I keep my cold pressures at 33/37 and that seems to allow for some serious back road twisty fun before the pressures become a problem. For the track is tart of even lower.

Do a search as this topic has had sereval in depth discussions already.

 

+1 to alexb76. That happens to be the Porsche recommendation numbers for half load and full load.

 

I have the same tires and keep the PSI at recommended levels by Porsche. My Indy says lower each by 2 PSI and tires will last longer.

 

You have to keep the factory setting goals in mind. They are setting pressures for the adverage driver in the adverage conditions and maximize fuel economy numbers. If you drive more aggressively and on more twisty roads than adverage than you will want to get a more aggressive alignment and run lower pressures to maximize grip.

 

Many of us that use these tires on the track find that they lose maximum grip quickly above 40 psi, especially in the rear. On my GT3 I shoot for 35F/37R hot, +/-1 psi. That seems to be the sweet spot. I start out with cold pressures of 29F/30R and they will quickly come up to hot pressures with a few laps on the track. For the street, you won't get the tires hot enough to get the pressures up there, so you can start out with considerably higher cold temperatures.

 

see also another thread about the same topic here:
http://www.6speedonline.com/forums/9...chelin-ss.html

 

I set street pressures as 33/37 cold and even at that my rears were at 44 after this mornings spirited drive.

 

100% on the spot

 

That makes sense to me, I will definitely be adjusting the pressure because this car is my weekend car (primarily used for "spirited" driving). Although I think I was pushing it a bit harder then I normally would last weekend, because I've never seen a picture of my car with this much lean.

 

Just checked the pressures set by the dealership they were 36F 41R Cold this seems to explain the squealing. Thanks for the tips.

 

The dealers love to shove air in there. Mine knows how I like it and leave it alone but I get the feeling that they think I'm crazy ;-)

 

No kidding, I get the same impression every time I leave my local P-dealer.

Thanks for sharing your experience!
Luke