How much tire pressure do you use?
#1
Member
Thread Starter
Join Date: 11-24-05
Location: Florida
Posts: 211
Likes: 0
Received 0 Likes
on
0 Posts
How much tire pressure do you use?
My tires say that the absolute max for the tires is 44 PSI, so I was wondering what a good amount of air would be for that. The dealer told me I need at least 28 pounds of pressure in there, but I think 28 is kind of low if 44 is the absolute max. In the end, I ended up going with around 39-41 PSI for each tire.
What PSI do you all use and on what max do your tires say? I'm trying to determine if I'm overinflating my tires or not. Thanks.
-Aleckor
What PSI do you all use and on what max do your tires say? I'm trying to determine if I'm overinflating my tires or not. Thanks.
-Aleckor
#2
Senior Member
Join Date: 10-19-06
Location: Currituck, NC
Posts: 907
Likes: 0
Received 0 Likes
on
0 Posts
My tires say that the absolute max for the tires is 44 PSI, so I was wondering what a good amount of air would be for that. The dealer told me I need at least 28 pounds of pressure in there, but I think 28 is kind of low if 44 is the absolute max. In the end, I ended up going with around 39-41 PSI for each tire.
What PSI do you all use and on what max do your tires say? I'm trying to determine if I'm overinflating my tires or not. Thanks.
-Aleckor
What PSI do you all use and on what max do your tires say? I'm trying to determine if I'm overinflating my tires or not. Thanks.
-Aleckor
#8
Senior Member
dude.... 32... thats just about what every manual and every shop teacher will ever teach you. just the max is 44 doesn't mean you want to be anywhere near that
#9
Member
Thread Starter
Join Date: 11-24-05
Location: Florida
Posts: 211
Likes: 0
Received 0 Likes
on
0 Posts
So 40 is overinflated then? or is it still alright at 40? That's what I'm trying to determine. Some of you are saying 32, some of you say 35, which is it?
-Aleckor
-Aleckor
#11
Member
Thread Starter
Join Date: 11-24-05
Location: Florida
Posts: 211
Likes: 0
Received 0 Likes
on
0 Posts
As for whether or not 44 PSI is overinflated is something I'm wondering myself. I have 40 PSI in my 44 PSI tires, and I'm curious if my tires are overinflated or not. Most of the guys here are saying that 32-35 PSI is optimum for 44 PSI tires (or any tires I guess?)
-Aleckor
#13
Senior Member
Join Date: 07-01-05
Location: Northeastern New York
Posts: 1,847
Likes: 0
Received 0 Likes
on
0 Posts
is there really hard and fast (no pun intended) rule about expansion with temperature. What I mean, cold inflation is 32psi, but when that tire is driven, does it really vary what the pressure increases to?
Scott
Scott
#14
Senior Member
Join Date: 03-17-06
Location: Moncton Newbrunswick Can.
Posts: 17,268
Likes: 0
Received 0 Likes
on
0 Posts
don,t forget in hotter tempatures your tire pressure expands more,I usually drop it 2psi in the hotter months and yes over inflation will cause the center of the tire to wear more quickly
#15
Senior Member
Your car rolls off the lot at 32-33, every time you get it checked, they reset it to 32-33, when you bring it to any mechanics shop for anything... they reset it to 32-33. If you get new tires they.....
well you get the idea. 40 is WAY overinflated
well you get the idea. 40 is WAY overinflated
#16
Senior Member
Join Date: 03-17-06
Location: Moncton Newbrunswick Can.
Posts: 17,268
Likes: 0
Received 0 Likes
on
0 Posts
wonder why it says 35 on the inside of the door then?
#17
Senior Member
Join Date: 04-02-06
Location: Harker Heights, TX
Posts: 3,507
Likes: 0
Received 0 Likes
on
0 Posts
I suggest you study up on this site http://www.carbibles.com/
Specifically this section http://www.carbibles.com/tyre_bible.html
With a 44psi max, I would recommend ~39psi. Take a MPG rating and also see how it handles there. Your MPG should go up, handling increase, slight rise in ride stiffness, and any weird tire wear should go away.
32psi is from 1990's tech tires. Car companies have not changed their recommendations since then, although tires have advanced significantly. Try google, should help you out.
Specifically this section http://www.carbibles.com/tyre_bible.html
With a 44psi max, I would recommend ~39psi. Take a MPG rating and also see how it handles there. Your MPG should go up, handling increase, slight rise in ride stiffness, and any weird tire wear should go away.
32psi is from 1990's tech tires. Car companies have not changed their recommendations since then, although tires have advanced significantly. Try google, should help you out.
#18
Junior Member
Join Date: 04-19-07
Location: Kemptville, Ontario
Posts: 457
Likes: 0
Received 0 Likes
on
0 Posts
32-35lbs.. MAX
#19
Senior Member
mine says 32, both in manual, and inside of door.
could possibly be your particular tire/rim setup in the pontiac?
Either way, that "max pressure" rating, is telling you the following:
Hey buddy, inflate me to this psi, and give the tire a good kick, and it may just blow your leg off.
just stick to around 30-35.
could possibly be your particular tire/rim setup in the pontiac?
Either way, that "max pressure" rating, is telling you the following:
Hey buddy, inflate me to this psi, and give the tire a good kick, and it may just blow your leg off.
just stick to around 30-35.
#20
Senior Member
Join Date: 04-02-06
Location: Harker Heights, TX
Posts: 3,507
Likes: 0
Received 0 Likes
on
0 Posts
Actually the max psi is cold. Tires are designed to handle 6 to 10psi over that, which is what will happen if you drive for a long time or drive really really hard.
#21
Member
Thread Starter
Join Date: 11-24-05
Location: Florida
Posts: 211
Likes: 0
Received 0 Likes
on
0 Posts
How long does it usually take for tires to lose their pressure? In other words, am I safe to just leave it around 40 PSI with a 44 PSI max? because inevitably eventually it'll drop back down to the 35-39 range which seems to be okay with most of you, though a lot of you think 32 is better.
Am I correct to assume it'll be okay or should I be letting the air out of my tires right now?
-Aleckor
Am I correct to assume it'll be okay or should I be letting the air out of my tires right now?
-Aleckor
#23
Senior Member
Join Date: 11-23-06
Location: Texas boy stuck in an Iowa Cornfield
Posts: 2,855
Received 0 Likes
on
0 Posts
Too much air, the middle area will wear faster
Too little air, the outside edges wear faster.
Side of the door is OEM perfered setting.
Too little air, the outside edges wear faster.
Side of the door is OEM perfered setting.
#24
Member
Thread Starter
Join Date: 11-24-05
Location: Florida
Posts: 211
Likes: 0
Received 0 Likes
on
0 Posts
http://www.sportcompactcarweb.com/te...ressure_guide/
I found a pretty good formula to use but I don't know how much the Cobalt weighs. How much does a Cobalt LS 2.2L weigh? Is it in my manual somewhere?
Anyway the formula is:
Vehicle Weight in lb/100) + 2 psi at heavier end + 2 psi all around if suspension and alignment are stock.
Example: Stock 911, 3,000 lb.
(3000/100) = 30 psi
Add 2 psi all around = 32 psi
Add 2 psi to heavy end = 34 psi at rear
With modified suspension, the result is 30 psi front, 32 psi rear.
I found a pretty good formula to use but I don't know how much the Cobalt weighs. How much does a Cobalt LS 2.2L weigh? Is it in my manual somewhere?
Anyway the formula is:
Vehicle Weight in lb/100) + 2 psi at heavier end + 2 psi all around if suspension and alignment are stock.
Example: Stock 911, 3,000 lb.
(3000/100) = 30 psi
Add 2 psi all around = 32 psi
Add 2 psi to heavy end = 34 psi at rear
With modified suspension, the result is 30 psi front, 32 psi rear.