i just went outside and checked my 2 front tires, it said one was running 50 lb of pressure, the other one was at like 25, i lowered the 50 down to about 25, but does that mean 25 psi? what do i want it at??

 

Stock tires? Stock rims? Stock door? Stock accessories and weight? Stock? Read the sticker on the door.

If not stock.... well you get the idea.

 

only thing i got is suspension and some ram air, everything else is stock

 

suspension changes things because that changes your camber and caster which changes your tire's contact patch with the ground.... so uless you have a camber kit you'll never get the pressure right because you'll never be able to make the contact patch relatively close to flat and therefore you're only using 20-70% of your tire anyway in which case you mayb be better off over inflating the tire to allow the tire to curve and thus gain a little bit more contact patch. breathe Then again deflating the tires a significant amount would also increase the contact patch... but ever hear of Bridgestone tires deflated on Ford Explorers..... yah. breathe

Anyway... maybe go with 32 in front and 28 in rear and see how that works for ya.

Or you could rub chalk all over your tires tread and drive in a straight line for say about 100' or so. Then look at the tire to see where the chalk has disappeared (transferred to the pavement) and if the chalk is still on the outside of the tire you've got too much pressure. If the chalk disappeared from the outside of the tire you don't have enough pressure. Basically the tires tends to become more round with increased psig of air. Then repeat. But again... with a modified suspension with improper alignment this test would be of little use. Also this test is more effective on bias ply tires... however the principle does still stand for regular radial tires as well... just not so much.... for instance a run-flat tire will not follow this principle very strictly.

Or read the door and do as it recommends.

edit: --- made a slight change ---

 

32 is stock in my rex, I use 45 though, for gas mileage, of course.

 

best advice i can give you if your not torchin the **** outa your tires is to run then between 30-35 psi all the way around.... preferably 32psi works great..... when all i did is mess with tires and crap at my last job you figure out what works and doesnt

 

I like 40psi except in really bad weather.