Tyre pressures on track days

[55jnj]

What's the general view ref tyre pressure adjustments for track days ?

Most will pump up about 10% over normal to avoid side wall flexing etc but then some argue that the pressures will go up substantially anyway due to the extra workload the tyre is getting generating heat etc etc.

[GreenV8S]

I run mine at round about road pressure, more in grippier conditions and if the tread is worn, less in more slippery conditions or when I have more tread. This often means I have to let air out during the day and then pump the tyres back up after they have cooled down. Whatever pressure you run at, it is important to keep an eye on tyres and brakes during the day.

[F1sh]

All depends on your driving style. I often used to go out, do a couple of laps then come in and check them. Leaving them about 4-6 psi over normal.

Fish

[Guillotine]

your chim tyres will gain 6-8psi over a session if worked hard. if you've already put 10% over, you will be at 30+psi during your session. seriously over inflated and making the car VERY skittish!

as pete says a couple of lb over (road tyre std walls ie goodyear/bridgie etc) watched during the day and with the prssure maintained as the tyre heats will give you good grip all day and also substantially increase longevity as the tyre won't be sliding anywhere near as much.

track photographers are a good source of info. look at the car, tyres etc and see how its behaving.

make sure you reset pressure before the ride home, as the tyre cools on the M-way you could go back down to 16psi!!

you up for the Monster then?
hows the chim...better now?

andy

[seandudding]

Andy

Have you ever made it out on track to realise that your tyre pressures need changing

Cheers Sean

[Guillotine]

teething trouble...thats all...RIGHT!

[55jnj]

Thanks guys - very useful stuff.

Andy, yes I think I will attend Monster but will see how my diary pans out in the next couple of weeks. Car not yet fully repaired/sorted from the Magny Cours trip although performed well at Oulton today - no new problems. Think it's getting time for another rebuild although will probably eave it a couple of months until the season starts to go quiet.

Cheers
R

>> Edited by 55jnj on Tuesday 2nd August 22:08