when is it neccesary 2 put in more air into tha tires??

 

When they are flat ?

Seriously, you should check them periodically, like once a week, when cold.
They will loose a little air all the time.

 

I was kinda wanting a definitive answer on this too. Tires have a max PSI printed. I usually inflate to max PSI or a lb or two under. Or are you supposed to put half of max PSI for the average? Just curious...any definite answers, or good bs:D. Thanks

 

how do you want your car too ride???more air=harder ride=better mpg and the reverse..maybe you should consider this...

 

as a general rule...tires loose 1psi a month.
check it every other month or at least every time you change your oil (should be 3 months....)

 

Why do you fill them to the max number stamped on the tire? Thats very high for normal use. Use the pressures provided on the drivers side door jam. And check the air pressure once a month or so.

 

To clarify frogbox's comment.

Check them once a week, check them when they are cold (not driven for three hours). He wasn't saying to only check them once a week when it's cold out.

In addition to dgHotLava's comment about 1psi a month they also will loose about 1psi for every 10 degree F drop in air temp you will need to add as the weather gets colder and could possibly (althought it's rare) need to let some out as the weather warms.

The max is the most the tire manufacturer says the tire can safely hold, this includes a large margin of safety I'm sure. The door jamb numbers are what Toyota has determined to be the correct psi for the vehicle based on weight, tire size/style, handling requirements, etc.

 

crap, i removed the sticker on the door jam. What shall i inflate mine? I got the 18" enkei.

 

why would u do a thing like that?

 

dont you know stickers add 10hp? now you only have 150 hp. jk it should probably be somewhere around 30-32 psi.

 

xB is 29psiFront and back tires per Toyota. I usually add air when the gauge reads 30-30.5(digital). What do people use to add air? I use an air compressor instead of driving to the gas station (increases tire air pressure= incorrect reading).
Guage type used/ better accuracy: needle or digital?

For All tC owners with Bridgestone RE92's: RE92's significantly reduces tire air pressure fast in the cold especially during winter. I had them on my former Camry. I started checking mine every week when I had the camry.

 

I run around 32psi and check it once a month. SCCA-Solo2 events require you to come in with at least 40psi to stiffen the sidewall, so high psi=better mpg,better grip, but too high and pot-holes will eat up your suspension.And lower psi = less mpg,softer ride,and more wear on the sides of your tires.

 

More PSI doesn't mean better grip. It will actually reduce grip because the tread surface will bow out which will shrink the contact patch.

I have 17"s and run 32 PSI and have normal even wear.

 

more wear = more grip.. doh

 

this is wrong...
you should check the pressure in warm tires. after you have driven for a few miles, the temp in the tires will go up.
if you filled the tire up to the max pressure, after a few miles the pressure could be 5-10 psi over the safe max psi.

 

The tires should be checked cold ( before being driven more thwn 3 miles), read the tires themselves, they always say Cold tire pressure.Even on the sticker on the inside or the door. The expantion factor is already figured into this.

Example: the pressure suggested on the sticker on my door says
cold tire pressure
29 psi front
29 psi rear

The stock tires read 44 psi max pressure @ max load ( 1102 lbs, thats the amount of weight in the car)

The suggested cold tire pressure is set so as to not excede the max pressure after driving.

These figures are for the stock steelies and tires, yours may differ with after market.

My 16" rims with 205x50/16 need 35 psi cold for proper wear, traction, and load carring capacity.

 

I think if you do some research on this you will find that the marked max inflation value is always stated at cold temp, ie, before any driving. It is understood that the hot reading will go up above this value, but it is factored in when the safety is considered.
Personally, I check mine about once a month. If I got lower readings after only a few days to a week I would be looking for a slow leak somewhere.

Walt

 

low pressure will adversely affect mileage as well.

 

the max load is the weight for that tire, not the weight in the car.
that tire should not have more that 1102 pounds on it.
four tires= 4408 pounds for the total car weight max.

and the second point is good to remember...

 

I betcha we got a 10 second car if it was that light .