can anyone tell what the tire presure is on a 1986 iroc is , i got 245/50/r16 on them.the door label is missing. someone told me 36 psi another said 40 psi , i have them set at 33 psi . help

 

I believe its 36 psi on Z rated tires for the car.

 

36 front, 33 rear works well. That's what I've been doing since the early 90's.

Add 5 PSI to the front for autocrossing or road course work.

Also set the alignment to as much negative camber as you can get, typically -0.5 degrees. It'll help road manners and help tire life.

 

Depends on the tire, some are 32psi, 35psi and 40psi...and I believe some even at 44psi(Bridgstones?)
Tires have recommended pressures stamped into them.

 

32/35 PSI is a good range for those tires.

 

I don't think so.....tires have MAX inflation PSI.

No one tire is made for just one car---so how could they put a PSI inflation on?

The door sticker, if it has one says the PSI the car manufacture specifies for that model. Of course you can run almost what ever you like---just don't under inflate it.