Goodwood

While at the CGI HPDE 2 wks ago, "someone" told us (me & my 2 kids) to raise our cold street tire pressures by 4 lbs, which we did. This eventually resulted in high pressure warning on my DIC. This is contradictory to what I just read on turnfast.com. They recommend going with about 5 less PSI cold as a starting point. It's expected to be 80 deg F on Mon, and I'm running KDW-2s in Novice class. fwiw, my sons both have FWD cars. Any tips/recommendations?

beerkat

I run the tire pressure that is recommended for the car. On my '01 Z it is 30/30 F/R. I have not had any issues with the way the car handles or the tires wear.. I run HPDE 3 with NASA-SE. I run the BF Goodrich KDWs in front and the KDW2s in the rear.

gkmccready

No matter what I start at I always have to bleed down a bit as the day goes on. I've been running 28/26 with the stock C6 Z51 runflats.

Goodwood

Sounds good, thanks!


So, you're are 28/26 cold? Once they're hot, where do you like them?

gkmccready

Yup. Mid-high 30s seems to work pretty well for the Supercars. First day out in the new car I wasn't paying enough attention and got the stupid over-inflation warning... put a little extra wear on the middle of the tire that day.

I'll have better information next weekend since I finally ordered a pyrometer...

Aardwolf

Last years setup liked 31.8 cold. It's going to change a lot, keep track of it.

Goodwood

I'll start low, work my way up.
Any recommendations for my Pfadts? Right now, and my 1st tiem at the track, I had them soft for the street at 4 frt/6rear.

Aardwolf

On mine I could watch the wear line, it was to high on the outside edge of the tire so I kept bringing the pressure down. There are small triangles on the shoulder that you can use to check the wear line.

I don't have pfadts, are those double or single adjustable? You'd probably want to start a new topic of that or try a search.

sperkins

The recommendation to raise cold tire pressure by 4-6psi is meant for non-experienced road course racers in order to save the sidewall of the tires during the learning process. There's no sense in chewing up a good set of tires until you really know what you're doing anyway. More air in the tires obviously makes them more slippery. A newbie driving under these conditions will learn the limits of the car much sooner and be able to run quicker times once the aire pressure is lowered to improve traction.

Goodwood

learned the limits of his car on the 1st session when he trashed his RF 5Zigen wheel and his Nitto Neogen tire. Cost me 400 bucks.

Aardwolf

What'd he do, make you a "deal" that you have to pay for any damages if he goes to the track with you?

Goodwood

that I'd spring for this 1st one, since his bro recently ran over a pothole on the street and did the same thing. But, from now on, it's his mistake on his nickel! Of course, expendable items like brakes and tires will always be my responsibility.

steve40th

these recommended pressure are for road racing, what about autocross?

beerkat

Not being an AutoX person I would think that you would raise your tire pressures when cold. I do not think that who would build the same amount of heat that road racer would.