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

User Tag List

 
LinkBack Thread Tools Display Modes
post #1 of 5 Old 10-07-2009, 10:33 AM Thread Starter
Compression Ignition Addict
 
schefft's Avatar
 
Join Date: Jan 2009
Location: San antonio
Posts: 178
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
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?


2003 F-250 CC SB FX4 Centennial Edition
SCT X3, Custom Street Tune by Innovative
4" SS Magnaflow, K&N Intake (Piece of $H!T)
ARP Studs, Zoodad, Homemade Center Console, Firestone Air Bags w/compressor, Sinister EGR delete
schefft is offline  
Sponsored Links
Advertisement
 
post #2 of 5 Old 10-07-2009, 02:32 PM
Compression Ignition Addict
 
pistolpete837's Avatar
 
Join Date: Sep 2006
Location: Bear Creek,NC
Posts: 929
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
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

Peter
2008 F-250 XLT FX4 SuperCab ShortBed
H&S Mini Maxx, DPF/DOC Delete, AFE Intake, Airdog, Terra Grappler
556 HP 1059 TQ

Farm Truck
2006 F-250 SD SC LB FX4, B&W turnover ball, Durabak liner, Cobra CB, cat delete
pistolpete837 is offline  
post #3 of 5 Old 10-07-2009, 03:44 PM
dc4
Powerstroke.org Fanatic
 
dc4's Avatar
 
Join Date: Aug 2009
Location: Silver Spring, MD
Posts: 134
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
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

Ford F350 6.4L Crew Cab
Long Bed
dc4 is offline  
post #4 of 5 Old 10-07-2009, 06:40 PM
Compression Ignition Addict
 
smotrs's Avatar
 
Join Date: Feb 2008
Location: Covina, Ca.
Posts: 2,709
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 0
Thanked 2 Times in 2 Posts
Feedback Score: 0 reviews
White grease pencil may be easier to see. But that's the procedure.

Shaun

'08 F250 6.4L Lariat 4x4 CC/SRW fully loaded, special ordered
6" Fabtech 2.25 dual shock lift w/18" AR wheels, 35" Toyo AT's
Avic-Z2 Nav/Stereo w/iPod, Bluetooth, XM NavTraffic
(2) Rear headrest mnt DVD entertainment systems
Line-X bedliner
Banks CAI, Dual Exhaust, Six-Gun, Speed Brake & iQ (test vehicle)
Bushwacker Fender Flares
Ravelco Anti Theft Device

Quote:
Originally Posted by Rick Santorum
We went into a recession in 2008 because of gasoline prices.
smotrs is offline  
post #5 of 5 Old 10-17-2009, 06:08 PM
Powerstroke.org Rookie
 
Join Date: Feb 2007
Location: Middletown, CT
Posts: 24
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
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.
firebill18 is offline  
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:
OR

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
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



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

 
For the best viewing experience please update your browser to Google Chrome