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Old 07-10-2008
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Icon2 tire pressure

I hear lots of complaints on fuel economy, but how many and how often do you folks check your tire pressure?
To throw some gas onto the fire... what pressure are you running?
I'm running my 31-10.5-15's at 42psi on the hwy and drop down to 30 offroad. As part of my hypermiling I'm averaging 24mpg in a mix of city/hwy driving. I take a fair hit offroad but that's the price I pay playing.
All this is done in a Mazda B-4000 SE X-cab 4x4 w/ 182.xxxmi. on it.
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Old 07-10-2008
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Haha like never. I checked them a week ago and they were the same pressure that I set them at 3 months ago.
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Old 07-10-2008
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I check mine every month or two. 38psi front 36psi rear.
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Old 07-10-2008
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Icon10

I check about once a month. I run 40psi all around
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  #5  
Old 07-10-2008
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I check mine every week. 35 psi all the way around. I'm running 265/70/16 BFG Long Trails.
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  #6  
Old 07-10-2008
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lol mine are at 32psi because they were wearing in the center.

I got 255/70/15 general grabber at2s
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  #7  
Old 07-10-2008
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i keep mine at 35psi
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Old 07-10-2008
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i run mine at 30 all the time, because it isn't unusual for me to just randomly decide to go hit some trails. also because i don't want to just wear out the centers.
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  #9  
Old 07-11-2008
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31psi all the way around. These are my new 30's (BFG T/A's).

Want even wear, so I stuck with 31psi to see how it works out.
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  #10  
Old 07-11-2008
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30 psi here thats what the door tag says to run so thats what i run
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Old 07-11-2008
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I've a good book at work. It's "fundimentals of vehicle dynamics" and the class is taught at UofM.

In it the writer says that once a properly sized (stock tire) is at 31-32psi the rolling resistance with increased pressures only goes down a very very small amount. Unfortunately there is a whole lot of math and circumstances that go into figuring out how much PSI to run in a particular tire/car situation.

Just know this. If an aftermarket tire on a ranger is rated at a load higher than the stock tire was? The running psi needs to be lower.

As a basis take my stock 265 goodyears when at 33 psi and the truck loaded down towing a boat. The tire sidewall tempature is in the 20F more than ambient range. (pull over into a rest stop and measured with a infared gun)

Use that as a "standard". If your say.. 32x11.5 tires are running hotter than that? You need to increase the psi a little. If they are lower than that? Your most likely prematurely wearing out the center of the tread.

Increasing psi more than 33-34 and you really are not gaining a "cost save" because wearing the tires out sooner is way more expensive than the little extra gas you burned.

Rich
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Old 07-11-2008
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Good call on the pressure guide! I like it... although not everyone has a thermo gun
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Old 07-11-2008
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Wanna know when i check it? When i'm airing down to 15 or 20, and when i'm airing back up to 35-40.



I can tell you......i forgot to air up after wheelin' last week. I was averaging 16-17 mpg on the highway, after i aired back up, was back to 21-22 mpg.
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Old 07-11-2008
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Quote:
Originally Posted by Zeppelinx View Post
Good call on the pressure guide! I like it... although not everyone has a thermo gun
LOL.. you know it really hurt me to spend the $90 when I bought it. But sakes alive! You can use it to check all sorts of stuff. Fridge temp, car stuff, RC engines, ect.. I actually keep it in the truck 24/7

Rich
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Old 07-11-2008
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thirty-five pounds per square inch.
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Old 07-11-2008
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Quote:
Originally Posted by Fx4wannabe01 View Post
Wanna know when i check it? When i'm airing down to 15 or 20, and when i'm airing back up to 35-40.



I can tell you......i forgot to air up after wheelin' last week. I was averaging 16-17 mpg on the highway, after i aired back up, was back to 21-22 mpg.
your mtrs are only rated to hold 35 MAX....


I run 22 PSI all the way around on the road and 8-10 off the road. anyone running over 35 on a ranger IMO is just wearing out tires and possibly causing unsafe driving because the contact patch is less.
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Old 07-11-2008
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32 PSI and I check them every time I change the oil. Don't forget to check the spare.
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Old 07-11-2008
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Quote:
Originally Posted by zabeard View Post
your mtrs are only rated to hold 35 MAX....


I run 22 PSI all the way around on the road and 8-10 off the road. anyone running over 35 on a ranger IMO is just wearing out tires and possibly causing unsafe driving because the contact patch is less.
Agreed. I run 32/30
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  #19  
Old 07-11-2008
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I just went down to 30 psi today because I think its still wearing int he centers a little.
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Old 07-11-2008
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Quote:
Originally Posted by zabeard View Post
your mtrs are only rated to hold 35 MAX....


I run 22 PSI all the way around on the road and 8-10 off the road. anyone running over 35 on a ranger IMO is just wearing out tires and possibly causing unsafe driving because the contact patch is less.
36 max cold. The gauge I use shows about 5psi over. So i forgot t mention that.
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  #21  
Old 07-11-2008
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I run 40 up front an 35 in the rear tires on my FX4, They wear flat and it works well for me.
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  #22  
Old 07-15-2008
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http://www.officer.com/article/artic...on=19&id=27281
Here is the source and reason for running my tires "overinflated"
The sidewall says 50psi max.
The wear on the center isn't something I've seen but the wear on the outer tread has been dramatically reduced and my mpg has gone up. Seems like a win/win situation to me.
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  #23  
Old 07-15-2008
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Never ever ever over inflate your tire to more then 5 PSI over the manufacturers recommendation. Also never ever over inflate them past the numbers on the tire. If you over inflate you can loose the handling characteristics of your vehicle. Also your tires are a vital part of your suspension system. Your tires are what cushion you from all the little bumps on the road, not your shocks/springs.

Also if anyone ever tells you that nitrogen makes it ride better or gets you better gas milage, you can be rest assured that they are lying. The only thing nitrogen does is help slow down the leaking that happens naturally with tires. Also since nitrogen expands at a slower rate it will help prevent your tire pressure from fluctuating.

This is comming from a Michelin Certified tire installer.

Oh also on the '04 rangers the placard and the owners manual says the recommended PSI is 30. This was changed later in the year to be 35 PSI. I know this is true for the 04s I dont know about other years.

Last edited by malydeen; 07-15-2008 at 05:32 PM.
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  #24  
Old 07-19-2008
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question. my girlfriends tires on her jeep say that they have a max of 80psi. Now i know that that is WAY to high, but what is a good psi to set them? Its a 4banger with 33's.. Shes gettng ****TY gas mileage... i put them up to around 45 today.. they were all below 28..lol.
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  #25  
Old 07-20-2008
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Quote:
Originally Posted by God,Country,FORD View Post
question. my girlfriends tires on her jeep say that they have a max of 80psi. Now i know that that is WAY to high, but what is a good psi to set them? Its a 4banger with 33's.. Shes gettng ****TY gas mileage... i put them up to around 45 today.. they were all below 28..lol.

IMO I'd try them in the 30psi area.

You might try slowly crossing some sand or dirt to see the pattern it leaves at different pressures.

Rich
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