So here's the story. I bought new Dunlop SP Sport A2's on Tirerack, went to a local tire shop and had them swapped with my winter tires. Tonight I decided to check the pressure in the tires and found my front drivers side tire to be 52psi (44 is MAX on this tire). The other front tire was running about 44, while the back were set at about 40. Is this a big problem? I've put about 500 Miles on them since I had them put on. Also, I dropped the pressure down to about 32 all around now. Is this a good level? Thanks for the input.

 

500 miles at that high pressure shouldn't be a problem. Glad you caught it early. 32 psi should be good, I always go 2-3 psi above stock pressure to get better gas mileage.

 

If these are stock sized tires (205/65-15) don't second guess Nissan and just set pressure to 29 lbs front/rear. The tire pressure should be written on a big sticker inside the center console lid between the front seats.

Unless you habitually drive like a maniac, overinflation will just worsen ride and exacerbate wear in the center of the tire.

EDIT: but yes, as GreenMax said you may help economy slightly by increasing pressure (harder tires -> less rolling resistance) It's a tradeoff of other things though, so no free lunch.

 

I've had a set of Goodyear Eagle HPs set at 60psi. Held up fine at speeds well over 100mph. Since they were high profile (215/60), I used the pressure to keep them stiff. I still run 215/60s, but I only run 45psi since the side walls are stiffer(Bridgestone RE950). I think as long as you have a good rated tire you can set the pressure to whatever you need for your type of driving. I prefer stiff.

Gene

 

Check your tire pressure when they are cold (best time is in the morning before the car has been driven). If the tires have been in the heat or you have been driving on them, then the tire pressure will be higher. As for outside temperature, tire will pressure go up approximately 1 psi for every 10 degrees above "normal", and likewise for cold except it goes down approximately 1 psi for every negative 10 degrees.