how much psi? - Ranger-Forums - The Ultimate Ford Ranger Resource


Wheels & Tires Semi-Tech General discussion of wheels and tires for the Ford Ranger.
Sponsored by:
Sponsored by:

Reply
 
LinkBack Thread Tools Search this Thread
  #1  
Old 02-05-2008
Member
Thread Starter
 
Join Date: Dec 2007
Location: Cypress, CA
Posts: 30
how much psi?

i have 31/10.5 bfg a/ts and was wonderin what psi you guys think i should be filling. As of now i have 32 psi and i do pretty much all on road driving so i dont need to know the best for off roading but i know that i should air down some if i do. The stock psi was 25. Any help would be appreciated.
Reply With Quote
  #2  
Old 02-05-2008
Member
 
Join Date: Mar 2005
Location: Wichita, KS
Posts: 1,301
What does it say on the tire? My revos say the max is 80psi and I'm running them at 60psi. I don't offroad very often so I usually don't air down when I'm out there.
Reply With Quote
  #3  
Old 02-05-2008
Fx4wannabe01's Avatar
RF Veteran
iTrader: (23)
 
Join Date: May 2005
Location: Boring, Oregon
Posts: 21,721
Here's a good test to figure out just the right pressure.....

(stolen from lifted97ranger)

It went along the lines of driving through a puddle and seeing what type of tread you are leaving on the dry ground....then adjusting from there. The rear pressure should be lower than the front pressure. What you want, is a proper "footprint"......so your tires wear evenly.......if the outside is heavy and middle is light, add air. If the inside is heavy and outside is light, take a lil out.

The side of the tire will tell you max psi when the tire is cold. When I air down off road...I'm usually airing down to anywhere from 13-20psi. But I play in snow, rocks, and mud.
Reply With Quote
  #4  
Old 02-08-2008
wydopnthrtl's Avatar
Member
iTrader: (2)
 
Join Date: Dec 2005
Location: SE, Mi
Posts: 2,342
I'd say go with 32 and just look at the wear patterns for your particular style of driving. If you see the center getting thin in the next 1000 miles then drop it 3psi and go another 1000.

btw, once you get over 32-33 psi (on a typical pass car tire), the rolling resistance from sidewall flex and tread distortion is next to nothing.
Source = Fundamentals of Vehicle Dynamics by Thomas D. Gillespie


Rich
Reply With Quote
  #5  
Old 02-08-2008
jtslmn720's Avatar
RF Veteran
iTrader: (1)
 
Join Date: Oct 2004
Location: Kent State, Kent Ohio
Posts: 7,367
just remember that the max written on the tire does not factor in the weight of the vehicle...
Reply With Quote
  #6  
Old 02-08-2008
DaGGer's Avatar
Member
 
Join Date: Mar 2006
Location: East Windsor, CT
Posts: 919
look on your door and thats the max that ford factory puts in there tires.
Reply With Quote
  #7  
Old 02-08-2008
Member
Thread Starter
 
Join Date: Dec 2007
Location: Cypress, CA
Posts: 30
ford puts it up to 25psi but me and my brother(a mechanic for Toyota) thought that to be a little low and there is no uneven wear except on the outside of my tires cause i used to drive like a maniac, and by maniac i was taking this one corner near my house at around 30 to 35 getting completely sideways and counter steering. i think i will just keep it at 32psi and see if i start to notice any uneven wear. thanks for the input.
Reply With Quote
  #8  
Old 02-08-2008
99ranger4x4's Avatar
RF Veteran
iTrader: (3)
 
Join Date: Jun 2006
Location: Austin, TX
Posts: 12,198
i run about 30.. probably needs to be taken down though

12 on the trail
Reply With Quote
  #9  
Old 02-09-2008
jimehat112's Avatar
Member
 
Join Date: Aug 2006
Location: Amarillo, Texas
Posts: 41
Quote:
Originally Posted by wydopnthrtl View Post
I'd say go with 32 and just look at the wear patterns for your particular style of driving. If you see the center getting thin in the next 1000 miles then drop it 3psi and go another 1000.

btw, once you get over 32-33 psi (on a typical pass car tire), the rolling resistance from sidewall flex and tread distortion is next to nothing.
Source = Fundamentals of Vehicle Dynamics by Thomas D. Gillespie


Rich
I agree here, I ran my Yokohama a/t's at the recommended 32psi for most of their life and they are just about smooth in the center and have plenty of tread at the edge. When you go to larger than stock tires, like I did, you need to realize that most are made for heavier trucks than rangers. The lighter weight doesnít make the tread flatten out as it would on a full size truck at the same pressure. I have dropped mine to 25psi and had a more even tread wear, BUT you should keep an eye on yours (different tire brands/ rubber compounds wear at different rates) and see how they wear, it doesnít take long (4-5k miles) for the center to wear allot if they arenít right.
Reply With Quote
  #10  
Old 02-09-2008
04lvl2's Avatar
RF Veteran
 
Join Date: Jun 2004
Location: Palm Bay, FL
Posts: 5,600
On my stock BFG A/Ts in 31x10.50R15 alcoas i ran 40 psi. BFGs dont wear right unless you run high psi. The dealer dropped the psi in my dads 07 and they are all chopped to hell right now. I have 30k on my stockers when I sold them and they where a little less than half worn.
Reply With Quote
  #11  
Old 02-09-2008
04 EDGE
Unregistered User
 
Posts: n/a
Quote:
Originally Posted by soccerjohn View Post
What does it say on the tire? My revos say the max is 80psi and I'm running them at 60psi. I don't offroad very often so I usually don't air down when I'm out there.
wow so you got 10 ply tires on a compact truck, sweet!
your tire salesman laughed all the way home that night!

lame!

take them back and make them give you the proper tires !

6 ply is more then enough for any ranger!!!!!

and even with those you should only run them at 30-35 PSI !
Reply With Quote
  #12  
Old 02-09-2008
gatorblue92's Avatar
RF Veteran
 
Join Date: Jun 2004
Location: Delaware
Posts: 8,238
i run 35 psi in my BFG tires
Reply With Quote
  #13  
Old 02-10-2008
ns_red7's Avatar
Member
 
Join Date: May 2007
Location: Coldbrook, Nova Scotia, C
Posts: 558
35 psi. The higher the psi the less bulge there is as the portion of the tread that is rotating into the road squashes against the pavement. That's what causes the majority of the resistance / friction / heat.
Reply With Quote
  #14  
Old 02-10-2008
Machine090767's Avatar
RF Veteran
 
Join Date: May 2006
Location: Minnesota
Posts: 6,410
on my goodyear at/s i run them at 35 psi
Reply With Quote
  #15  
Old 02-10-2008
Rolldogg's Avatar
Member
 
Join Date: Jan 2006
Location: Ottawa, Ontario
Posts: 3,424
31x10.5x15 BFG All-Terrains , I run mine around 34 psi. Any less and they bulge out at the bottom.
Reply With Quote
  #16  
Old 02-10-2008
pehlke1985
Unregistered User
 
Posts: n/a
Quote:
Originally Posted by soccerjohn View Post
What does it say on the tire? My revos say the max is 80psi and I'm running them at 60psi. I don't offroad very often so I usually don't air down when I'm out there.

Dude man your running yours at 60???? A ranger is not a 3/4 ton i run like 30 in the front and 28 in the rear and the centers still went faster than the sides 60 is wayyyy to high for a ranger and its suspension componants!
Reply With Quote
  #17  
Old 02-11-2008
99ranger4x4's Avatar
RF Veteran
iTrader: (3)
 
Join Date: Jun 2006
Location: Austin, TX
Posts: 12,198
12...
Reply With Quote
  #18  
Old 02-11-2008
WowMike2001's Avatar
Member
 
Join Date: Oct 2007
Location: Stevenson, WA
Posts: 2,583
I uhh.. air mine up to 92 PSI o.O

Nah, actually, im sitting at 34-36 roughly on mine.. tires tell me roughly 45 on cold, and I usually put all my tires at 34/35/36 ish anyway.
Reply With Quote
  #19  
Old 02-11-2008
5speedin2.3's Avatar
Member
 
Join Date: May 2005
Location: Livonia, Mi
Posts: 12
i run 28-31 with my bfg at's.

im running 28 right now because of the snow/ice.
it seems to grip a little better in the snow with the lower psi.

i think the lvl2's come from the factory with 30 or 31psi, its on the door sticker.

im running 8" wide rims, so who knows.



and to the guy running 60 psi and thinking the side wall pressure is what you should run... : :

Last edited by 5speedin2.3; 02-11-2008 at 03:20 AM.
Reply With Quote
  #20  
Old 02-11-2008
99ranger4x4's Avatar
RF Veteran
iTrader: (3)
 
Join Date: Jun 2006
Location: Austin, TX
Posts: 12,198
aka he should run 12psi
Name:  longs003-1.jpg
Views: 14
Size:  70.7 KB
Name:  longs004-1.jpg
Views: 13
Size:  74.7 KB


seriously!

if nothing else it looks sweet
Reply With Quote
  #21  
Old 02-12-2008
levelIIrdneck's Avatar
Member
 
Join Date: Mar 2007
Location: shelbyville,tn
Posts: 196
32 is about right for what your running
Reply With Quote
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
how much psi can stock manifold take? tenacious006 2.9L & 3.0L V6 Tech 0 03-11-2011 04:11 AM
PSI redranger04g Wheels & Tires Semi-Tech 17 09-02-2009 05:43 AM
what psi are you running? God,Country,FORD Wheels & Tires Semi-Tech 8 03-02-2009 07:00 PM
bigger tires, whats your PSI? FMD Wheels & Tires Semi-Tech 22 02-26-2007 06:33 PM
PSI/Water Temp Gauge HighRollerII General Technical & Electrical 16 07-19-2006 05:02 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -6. The time now is 06:46 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.