Tire Pressure

I read in the Driver' Manual for my 82 SC that the tire pressure [cold tires] should be: front, 29 psi and rear, 43 psi.
Is this the general consensus of opinion?
If yes, what would the recommended pressure be assuming the SAME tires are used for club Supersprints and Time Trials?
Thanks for any input
Jack K

With our 1987 Turbo, the pressures are 29/44 for the stock size and I have them about 4# higher so my wife can steer the car a little easier. The wear seems to be pretty even. For the track, I have different tires and run the pressure about 2# lower than the book, but I also check the temps across the tread to make sure they are pretty even. This is with 1.25 degrees neg camber and 0.25 inch toe in on the front. Check with others when you autocross as I have found most owers are willing to share the info on tires.

John
Thanks for your reply - it highlighted the fact that I misread my Driver's Manual [which covers the 911 Turbo as well as the SC. I was looking at the pressures for the Turbo. The recommended pressure for the SC is 29/34 - makes more sense to me.
Maybe someone can still let me know the 2nd part of my question ...

With regards to sporting event tire pressure, the best way to figure out tire pressure is to use white shoe polish, make marks in several places on the tire sidewall and tread area, drive several laps at speed, then read the marks. The white marks will show you how much the tire is rolling over on itself. Be sure the tire is using all of its tread - lower or raise the tire pressure until the whole tread surface is being used. Many of my friends, and I have used this method very successfully. BFGoodwrich recommends such a method as well. I hope this helps you adjust your tire pressures, as the ideal pressure is different depending on car weight, tire and air temperatures, etc., therefore this method of marking the sidewalls is very effective.

Garrett,
I will experiment as you suggested.
Thanks for the advice.
J

I talked to several other autocross fanatics and they said the shoe polish is good, but if possible read the tire temps too. If a pyrometer is not available, you can look real close at the tread right after a run to see where the scuffing or melted rubber forming across the surface of the tire. Some street tires have soft side walls even though they are Z rated and will roll on you real easy if the pressure is too low.

The thing that instigated my original post is that I am a complete novice and on my maiden Supersprint my ignorance was emphasised when I spun my SC twice in the first two rounds. I didn't feel I was going all that quick. As you said - owner's are willing to share information - and it emerged that my tires were hopelessly under inflated. After the morning sessions I put more air in - I still didn't know how much so it was a nominal choice - and immediately felt more comfortable and confident and kept to the track pretty well with vast improvement on my first few attempts.
Thanks to the responses I've received, when I go back I can experiment knowing a lot more than before.