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Tire pressure

KK

KK

Lifer
Do you go by the pressure listed on the tires or whats written on the sticker inside the door. Tires say 40 or 45 psi, while sticker says 35 psi. What should i go for?
 
My friend followed what was said on the tires until I pointed out that it was reporting the 'maximum PSI' which may not equal the recommended PSI.
 
I'd go with the max on the tire, you will get better gas mileage. I used to run my tires at 55 PSI when I was autocrossing, great response, but I was always worried they would explode so I would bleed off the extra air after each event.
 
Correct pressure maintains best footprint. Too high lifts the corners off and wears the center faster and increases risk of road hazards. Too low deflects the center away from the pavement and wears the outer edges of the tread faster. Increased deflection results in greater heating and risk of failure. Fuel efficiency also plummets. Always adhere to vehicle manufacturer recommendations!
 
Originally posted by: Captain_Howdy
I'd go with the max on the tire, you will get better gas mileage. I used to run my tires at 55 PSI when I was autocrossing, great response, but I was always worried they would explode so I would bleed off the extra air after each event.
Click to expand...

I would worry if he was doing alot of freeway driving, especially in the heat of the day.
 
Well, I'll have to pump them up alittle more. Ever since I've gotten new tires last year, my mpg has sucked. The pressure I've been running has been right around 35psi, which was the same I had on the old tires, but the new tires have a higher max pressure listed on them.
 
Stick with the recommended tire pressures (as indicated in your owner's manual or on your door jamb). They were chosen for a reason. As you increase your pressures towards the maximum pressure you're going to make the ride much more harsh and possibly cause poor handling. Yes, you will get better gas mileage by a few percent. But you need to understand the tradeoffs.

Mark
 
Originally posted by: illusion88
Originally posted by: Captain_Howdy
I'd go with the max on the tire, you will get better gas mileage. I used to run my tires at 55 PSI when I was autocrossing, great response, but I was always worried they would explode so I would bleed off the extra air after each event.
Click to expand...

I would worry if he was doing alot of freeway driving, especially in the heat of the day.
Click to expand...


No need to worry Autocrossing events are held in closed parking lots, and like I said I would bleed off the extra pressure before getting on the freeway and heading home. As for the vehicle sticker, how do they know what kind of tire is going to be installed after the factory ones wear out? You will be perfectly safe following the max on the tire, just remember to check while your tires are cold. Leaving a few PSI for expansion after the air heats up is a good idea, but the tires also exhibit some more give when they get warm from driving. Checking often is good to get an idea about how your particular tire/wheel combo behaves between temperature changes.
 
My understanding it that the vehicle recommended tire pressures are the ones at which you get optimal handling and which the suspension is tuned to...my 323 sticker says 29 for the fronts, and 26-28 depending on load for the rears...
 
Umm, if you fill your tires to what it says on the tire itseld you are a dumbass. That number is the MAXIMUM tire pressure it can have to be safe. If you fill it to that and then get in the car, you just went over that. Add another passenger or some cargoa dn now you're way over it. You should always use the numebr that's on the sticker inside the door or glove box or wherever your sticker is. You can go a bit up from there but you shoudl enver fill them up to the number that's actually on the tire. That's what it shouldn't go over ever, like when your car is jam packed to the top full of stuff.

And it's different for every car so check your sticker. My car says 30, truck says 35, etc.
 
hmm.. I need to fill my tire. I noticed the other day it was almost completely flat.
If i go to the gas station to fill it up do they have the pressure guages on the air hose or do i have to bring my own?
 
Originally posted by: TwinkleToes77
hmm.. I need to fill my tire. I noticed the other day it was almost completely flat.
If i go to the gas station to fill it up do they have the pressure guages on the air hose or do i have to bring my own?
Click to expand...

Some do, some don't. I keep a guage in my glove box. They're usually only a few dollars at a truckstop or auto parts store.
 
Originally posted by: Captain_Howdy
Originally posted by: illusion88
Originally posted by: Captain_Howdy
I'd go with the max on the tire, you will get better gas mileage. I used to run my tires at 55 PSI when I was autocrossing, great response, but I was always worried they would explode so I would bleed off the extra air after each event.
Click to expand...

I would worry if he was doing alot of freeway driving, especially in the heat of the day.
Click to expand...


No need to worry Autocrossing events are held in closed parking lots, and like I said I would bleed off the extra pressure before getting on the freeway and heading home. As for the vehicle sticker, how do they know what kind of tire is going to be installed after the factory ones wear out? You will be perfectly safe following the max on the tire, just remember to check while your tires are cold. Leaving a few PSI for expansion after the air heats up is a good idea, but the tires also exhibit some more give when they get warm from driving. Checking often is good to get an idea about how your particular tire/wheel combo behaves between temperature changes.
Click to expand...

If you have the cr's handook, you will find recommended pressure for every size of tire allowed.
What is written on the tire is the maximum safe pressure the tire can contain. If you are to load the car a lot, it would be wise to increase pressure. If you are going with the car empty, stay close to the minimum pressures recommended
 
why in the world would you just blindly max out the tires... every car is different.. start w/ what's recommended, adjust from there.
 
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