track day tyre pressures

[rolla91]

hey guys, im going on another track day in a couple of weeks and im wanting your opinion on what tyre pressures to run, i know there are lots of variables that i need to consider on the day but just a rough figure would be a good start.

the car is a zre and the suspension is stock except for a rear swaybar and a front strut brace. last time i was on the factory tyres (which are crap imo) and ran i think 42 psi front and 40 psi rear.

im now running some good falken tyres and added camber bolts. what would you recommend trying this time? was i close with the pressures i ran last time or way off?

any help will be greatly apprciated

cheers

[jeffy]

are they semis ?

[rolla91]

no they arent unfortunately. they are just 'normal' street tyres but high performance so iv been told

[jeffy]

30-35

[rolla91]

cool good starting point. should i run the same front and back? also is it best to up the pressure when they tyre is at operating temperature or cold?

cheers for helping.

[jeffy]

erm, im not that great with these set ups as im a newb as well,

when i went track, i kept it at 35 warm, and when it becomes cold it drops down to 32, all around

a friend told me that tyre pressures dont play a huge difference when it comes to street tyres.

[rolla91]

ok thanks mate, appreciate the help. ill give that a go for my next track day. i had a feeling the pressures last time may have been a little high.

only thing i was thinking even though they are street tyres higher pressure would make the side wall stiffer to prevent tyre flex?

[SuperDave]

Just be careful of low tyre pressures allowing the bead to be peeled off of the rim. It happens.

30PSI hot is far too low for a street tyre, I run my semis at that pressure. Keep it above 36PSI and should be fine.

[rollaurion]

You really need to experiment with your car, tyres and the track you are on. 40+ is to high for street tyres, you will end up with less surface area on the track. As a general rule I'd go with 38 +1/-2...

[runxz]

I normally start at 36 psi all round and go from there.

[rolla91]

cheers guys. i think ill try about 38 psi next time and see how that goes. i realise i need to see what works for me on the day and the track im at as i stated above i just wanted to see if the pressures i ran last time were close too what i should run, turns out they were a bit high.

is 32 psi good for street driving?