Tire Pressure - Ford Powerstroke Diesel Forum
General Diesel Discussion Discuss everything else pertaining to Diesel Pickups.

Powerstroke.org is the premier Diesel Truck Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 10-07-2009, 10:33 AM
Compression Ignition Addict
 

Join Date: Jan 2009
Location: San antonio
Posts: 178
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Tire Pressure

Anyone know how to figure out exactly what tire pressure you should be using when you are using larger than factory spec tires?
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2  
Old 10-07-2009, 02:32 PM
Compression Ignition Addict
 

Join Date: Sep 2006
Location: Bear Creek,NC
Posts: 929
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Send a message via AIM to pistolpete837
i usually start at the psi on the side of the tire and adjust if the tires start wearing uneven
Reply With Quote Quick reply to this message
  #3  
Old 10-07-2009, 03:44 PM
dc4 dc4 is offline
Powerstroke.org Fanatic
 

Join Date: Aug 2009
Location: Silver Spring, MD
Posts: 134
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
theres a good link on here somewhere that shows you how to determine if you have the right tp. Basically you draw a chalk line across your tire and drive about 20 feet, check where the chalk line wore. If it wore on the outside then your tire is underinflated, if it wears in the middle then they are over inflated, I think you just want to have a happy medium
Reply With Quote Quick reply to this message
  #4  
Old 10-07-2009, 06:40 PM
Compression Ignition Addict
 

Join Date: Feb 2008
Location: Covina, Ca.
Posts: 2,709
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
White grease pencil may be easier to see. But that's the procedure.
Reply With Quote Quick reply to this message
  #5  
Old 10-17-2009, 06:08 PM
Powerstroke.org Rookie
 

Join Date: Feb 2007
Location: Middletown, CT
Posts: 24
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Its a percentage of the load. My Factory size is 265/75R16E. The tire is rated at 3415lbs @ 80 psi. I currently run 285/75R16D at 55 psi. The way i figured it is divide your Gross axle weight by 2 to get the load for on tire then divide that into the max load to get the percentage of that then multiple that number by the max psi for the tire. Here is my break down. Also here is the pressure if you have the 5200lb axle.
Front: 4800/2=2400lbs 2400/3305=.73 .73x65=48psi
Rear: 6000/2=3000lbs 3000/3305=.90 .90x65=55psi
Front: 5200/2=2600lbs 2600/3305=.79 .79x65=52psi
I run all my tires at about 50psi. If you know your empty weight front and rear you can reduce by more pressure. All manufactures spec their vehicles to run fully loaded its just easier than give an empty and loaded pressure because if you forget to inflate them before you load you will destroy the tires. Hope that helps.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Ford Powerstroke Diesel Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Display Modes

Posting Rules
You may post new threads
You may 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 On
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -8. The time now is 10:09 PM.


Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.6.1
Garage Plus, Vendor Tools vBulletin Plugins by Drive Thru Online, Inc.

vB.Sponsors