Yes! that is the name! Thanks

 

That's what I'm here for

 

I run 42-45psi in my 20's. I prefer a little more air with ultra low profile tires, just to be on the safe side to hopefully reduce the chances of rim damage. Of course, if you hit something too hard, it doesn't really matter what your psi is. You're rims will be toast.

 

Thanks for the information guys. As long as it doesn't wear my tires unevenly I am fine with the crappy ride quality.

 

depending how much its overinflated, overinflation can wear your tires unevenly in the center of the tire tread, as well as lowered grip vs properly inflated tires

 

"cold" means @ 70 degrees, every 10 degrees hotter adds 1 psi every 10 degrees colder reduces 1 psi. driving causes friction between the road & the tires which heats the tire & increases psi.

 

No this is not what causes the heat build up. Carcass flex is what causes the heat build up. It's the internal friction of the rubber compound. Under racing conditions it's a combination of slipping on the surface and carcass flex which is why you typically raise pressure for the track - it lets the tire run cooler at the same load than it would with less pressure. This is also why tire pressure is critical at the track - if the tread compound is too cold, you don't get full grip (over pressure), if the tread compound is too hot, you get greasy and the tires slide easily (under pressure). Racers use tire pressure for fine adjustment to under/oversteer for this reason.

Dailiy drivers just need to balance even tire wear with their driving style by adjusting air pressure.

 

Just found out exactly why I gain MPG with 19s.

It is because it isn't the same stock diamater. Therefore, my speedometer shows 80 MPH but in reality it is actually going only about 76 MPH. I noticed this through my GPS on my 9500i. The speed is very accurate on the 9500i.

Is there anyway we can change this? Since my car is reading about 4-5 MPH above, that means when my car hits 100k, its actually maybe 90k.

 

I'm also interested. Something doesn't seem right about that statement.

 

what wheel did you get? did you get rid of the Linea Corse? I'm running 40psi cold

 

No, Smokey's pretty much right.

What he meant to say was Rolling Diameter of his wheels.

You can fix this by getting 18's =P

 

The owner's manual lists the correct higher psi for speeds over 100 mph, by the stock tire sizes.

 

Why isn't this right? It's actually true. I remembered my mechanic told me this couple years ago. But I actually remembered. Just remember when you put on some 19's or 20's. It will be off by 2-5 MPH.

 

if you leave 18's with a wider set or low profile does it throw off the MPH numbers?

 

THe car is not as mportant as what they do, some of it is dangerous.

Coasting
Drafting
Coasting into stop lights to avoid stopping
Turning off A/C, windows closed

get the idea?