Track day tyre pressures

[Piets94]

What is an appropriate cold tyre pressure front and rear to use on track with the stock PS2 tyres (or any other road tyres for that matter)? And what pressures should they be holding during the sessions?

Used to running r-spec tyres on previous cars (low cold pressure), first time tracking on road tyres, so thanks in advance for any input here.

[Splinterz88]

I think it depends on the ambient temperature, but they seem to like 35-36 psi hot.

[jadatis]

If you have found the ideal cold pressure for on the road , you first have to calculate what it would be warm normally.
Then take care that you fill cold such a pressure for the race, that it gets warm the same as warm roaduse temperature in the tire.

I made a spreadsheet for that in wich I give the normal cold 18dgrC/65dgrF.
And normal warm 45dgrC/112dgrF . Then it depends on what kind of race it is.
If you have many curves and have to brake often, the inside tire temperature gets about 90dgrC/190dgrF warm and I pre-fillled that in the spreadsheet.
https://onedrive.live.com/?cid=a526e...E092E6DC%21793
This link leads to my motorhome-tyre-pressure calculator map in wich 2 pressurecalculationwithtemp spreadsheets wich use degr F and PSI.
In part one a simple calculation of the needed pressure with the formula of ETRTO and then in part 2 the cold pressure to fill ,to get the same warn pressure as normal. Part 3 is to see the warm ( or cold) temperature when filled in 2 pressures and cold ( or warm) inside tire temperature.
Download it first to your computer by RIGHT-CLICKING and choose DOWNLOAD . After download and eventual virus-check open it in Excell programm on your computer, but Open office CALC can handle it too.
Dont leftclick goes wrong, also dont click open in Excell or WEB-app, to complicated or goes wrong too.

So play with my spreadsheet and get a better idea of what is important.

[MDORPHN]

I ran PS2 tires twice for the One Lap of America. Haven't dug up my notes, but recall they were happiest at 37-38 hot and that I'd pick up 7-8 psi on track.

That suggests to me starting at cold temps around 29-30 psi.

Neil

[Kgolf31]

Monitor your rollover and adjust pressures accordingly.

If you can, when you get off the track take pressures ASAP. Typically you'll see a 6 PSI Delta from Cold to Hot

[timbo_3101]

Rohan targets 37psi (hot), and is producing excellent results. Therefore, probably just aim higher and bleed air after the first couple of sessions.

The two power circuits (Sandown and Calder) will not generate much temperature or pressure increase.

The fastest circuit (Phillip Island) and slowest/technical circuit (Winton) will produce marked cornering stresses, particularly of the outside tyres - so effectively once you have achieved 37psi (hot), this might deflate back to 31psi (cold, inside) and 29psi (cold, outside), for example.

(As you probably already know, these stresses will be dependent on circuit layout, driving style and vehicle set up, etc)

[Piets94]

Thanks for all the advice guys. First time on track with this beast. Should be interesting/fun

[DooBs]

had the same question too 3 weeks ago at Buttonwillow.
Just winged it. Started with 25 cold was a bit low and bumped it to 28-29 cold afterwards