Tyre pressures for track day?

I'm doing a track day on Monday at Mallala in SA.
I'm looking for advice on what tyre pressures are recommended for the track.
My SW20 is totally stock, with standard 15x6 & 15x7 wheels and 195 & 225/50 tyres.
Any help is appreciated.

I've got Falken ZE912 tyre's. Its hard to get much in stock sizes these days. They have to do until i can afford new 17" wheels.

The day will be hard on your tyres and if you are pushing hard you could easily kill a set at a track day, particularly if the tread is new and deep. Keep the pressures up. Try 35/40 F/R as a start - set cold before you leave home. Check again after 5-10 laps and see what the pressures have come up by. More than 4-5 psi increase hot and you may be a little low. If it rises by less than 4psi you are a little high.
To save the tyres stay a little high on the pressures- it may not be the fastest lap time but it will save the tyres and also make the handling a little more predictable.
If you have got time to get a wheel alignment before the track day, add some negative camber - saves the outside edge of the tyres and helps the car turn in.
Avoid really long sessions where the tyres overheat - do 5 to 10 laps then let the car cool down - saves the car a bit too.
Smashing out 30 laps at maximum effort will kill a standard road car.

Pete.

I just did my first track day at queensland raceway with 15x6 15x7 +45 offset stock 5 star rims with 205 50 15 / 225 50 15 kumho ecsta's / bridgestone grid III's (old tyres). Started running 40 psi front and back. Just got a wheel alignment done and balance done and thats what they set the tyres to.
Car handled really taily initially but once up to temp and after a few laps and getting to know the track ended up running 32psi 34psi front to back. Was very predictable. Hope this helps!

I've used those tyres before. If you have plenty of negative camber and stiffer suspension, you can get away with lower pressures.

For a stock standard car I'd use something like 38 psi front, 40 psi rear (hot). Start out with 35, 37 cold and drop them back down to 38, 40 as they heat up after each session. Keep an eye on the outside shoulders. If they're getting smashed, add another 2 psi and check again. But with standard suspension the shoulders are always going to cop it a bit more. If the shoulders are doing ok you can drop one or two psi out to try and get some more grip.

Do your pressure checks and adjustments as soon as you come in from a session while they are still hot!

You can play around with the pressures a bit to alter the handling but if it's your first track day I wouldn't bother. Better off just getting a feel for the car and learning it rather than changing it every session.

I had a great day at Mallala, the car was faultless, even totally stock with cheap road tyres.
Although i had the back slide out a couple of times, i managed to catch it without the car spinning :)
I managed a best of 1:34.97, which i think is pretty good for a stock NA MR2.
I wonder if Carmikey or another SA member can confirm if this a reasonable lap time for a first time at a track?
I think i'm addicted lol. Pity i live 800km's away from the nearest track!

I did find the pressures varied a bit after the first couple of sessions and had to drop them a few psi.
The brakes held up without a problem, we only did 10 min sessions which was enough for 5 flying laps.
I did a total of 8 sessions across the day which was great. I was low on fuel by then lol.
I was really happy with the car, i drove 800kms to get there, did the track day and drove 800kms home (across 3 days) and the car was faultless. Engine temps stayed good and i was faster than the NA Supra and Skyline in my group (they were holding me up in the corners, but pulled away slightly on the longer straight (actually a long sweeper - when i was in front of them i managed to leave them behind after a few laps)
I've thought of a way to reduce the weight by 20kg's without touching it - I need to go on a diet lol.
I might need to check my timing later, the engine seems to be overrunning slightly when i lift off the accelerator to change gears. Other than that my arms and shoulders were getting a bit sore by the end of the day.....might need to exercise before the MTC (might help with the weight reduction too lol)
 

Vid from my track day... thanks everyone for your help :)
 
https://www.youtube.com/watch?v=tloX-d2ekFA