I noticed today, as I fixed a flat on my Mark, that the Max tire pressure on my General Tires is 44psi. I've always run my tires at 32psi. Is there a right and wrong psi based on max tire pressure stated on the tire?::uh::
Tha max listed on the tire is the pressure you would use if the tire was carrying the maximum weight it could. Since the weight of the Mark VIII on 4 tires is substantially less that what the tires could actually carry at maximum load, the pressure is reduced proportionally. 30-32 pounds is correct. The correct pressure results in the most even wear.
What your tire pressure should be is listed on a sticker on the door jam as is most cars. For the Mark I can't remember if it is on the drivers side or passenger side. 30 PSI cold is the recommendation.
I'm currently running 35 PSI in my new BFG 235/60/16s. They have a high load index, though, and I lost over 4 MPG when I ran them at 28-30 PSI (as compared to the old stock Michelins). Now, I've only lost about 2 MPG.
Your driving habits should determine what pressure to run your tires at. If you inflate them more, you get better cornering ability, if they're a little softer, you might get a softer ride. If your tires are wearing evenly across the tread, the pressure is good. If it's wearing in the center more than at the edges, it's too high. If it's wearing at the edges more than at the center, it's too low.
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I usually run closer to 40 psi.Your driving habits should determine what pressure to run your tires at. If you inflate them more, you get better cornering ability, if they're a little softer, you might get a softer ride. If your tires are wearing evenly across the tread, the pressure is good. If it's wearing in the center more than at the edges, it's too high. If it's wearing at the edges more than at the center, it's too low.
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More pressure gives better cornering? I would have thought that balooning the tires would put less of a tire patch on the ground thus leading to poorer cornering.
Handling and feedback are improved with slightly higher tire pressures. If you ever go to an autocross you will see people airing up their tires to make the car more responsive. For drag racing lower pressures on the drive tires can be helpful, but for cornering, you want higher pressures.
If there's one thing I learned from my shop teach in high school, it was don't over inflate your tires for daily driving. Bad for the wheels, especially mark viii aluminum ones, and the struts! We learned that and, "Dammit, get me the PB blaster!" I dont know why he used that crap.
1965 Mustang in primer
1995 Mark VIII http://memimage.cardomain.net/member_images/3/web/771000-771999/771311_5_full.jpg