air pressure, dirt roads - Ford Powerstroke Diesel Forum
Powerstroke Off Roading Pics, stories, vehicle recovery

 
LinkBack Thread Tools Display Modes
post #1 of 8 Old 08-14-2011, 11:06 PM Thread Starter
Serving Our Country!

 
Join Date: Sep 2009
Posts: 771
Thanks: 0
Thanked 1 Time in 1 Post
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
air pressure, dirt roads

Hey all. I am going to be running 37x12.5x20 nitto trail grapplers on my 350. Anyone play with tire pressures with them? I am trying to get a good starting point for fire roads etc...

There are a couple trails that are by my in laws that are about 15-20 miles into the hills that I would like to hit up...but I have a feeling the 60 psi I run on the street would not be ideal...

Suspension set up will be 4 wheel coil overs, not sure the spring rates yet, but probably 300 over 500 fronts and 250 over 400 rears. But maybe not...

2002 F-350, was a DRW, now a SRW (but kept the dana 80 ARB's front and back, 4.88 gears on 37's
AIS, 4 inch MBRP, 38R ww2, IHI bellowed up pipes
PHP 6 Pos Chip, swamps 140 volt mod
PMF coilovers and 4 link...front and back
2008 D60 up front, 2002 D80 out back
Psc hydro assist with ported hydroboost, p pump
fifty is offline  
post #2 of 8 Old 08-14-2011, 11:16 PM
Compression Ignition Addict
 
dazdillenger's Avatar
 
Join Date: Feb 2011
Location: upstate ny
Posts: 2,254
Thanks: 0
Thanked 3 Times in 3 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 7 reviews
Are the roads full of washboard sections? If so, good luck. I doubt anything you do will smooth them out while still keeping the truck streetable. Maybe throw 500lbs in the back-lol.



2005 Lariat CCSB F-350 SRW
300,000 miles and going strong

Exterior
12" fabtech lift with 40" Xterrain's on M/T classic locks, Adjustable track bar, Bilstein 7100 reservoir shocks

Performance
Edge juice/attitude CTS, SCT with ID tunes, Snow meth. injection, Diamond eye 4" exhaust, 03 turbo, ARP studs, Sinister coolant filter

Interior
2010 stone seats/console, pioneer avic d3 with backup camera/bluetooth

Misc.
Viair 450c compressor, dual 2.5 gallon tanks, air horns rated @115db
dazdillenger is offline  
post #3 of 8 Old 10-04-2011, 06:01 PM
Member
 
SmokeyAussie's Avatar
 
Join Date: Sep 2011
Location: Alberta, Canada
Posts: 75
Thanks: 7
Thanked 1 Time in 1 Post
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
just depends on how rocky the gravel road its...what speeds you will be doing and what weight you have in teh back.

i run mine at 30psi and it helps soak up a lot of the small stuff, and there is less risk of you getting a tire staked or torn on sharp rocks

it will be something that is personal prefferance to how low a psi you go, i had three or four trials with different pressures to see what one i thought was best. you will be suprised as to how big of a difference 5psi makes.
SmokeyAussie is offline  
post #4 of 8 Old 10-04-2011, 09:54 PM Thread Starter
Serving Our Country!

 
Join Date: Sep 2009
Posts: 771
Thanks: 0
Thanked 1 Time in 1 Post
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Thanks for the info guys. The trails will be assorted...I am sure there will be wash board on parts, washed out on others

As for weight, I have an ARE shell on the back, plus two dogs (thats 125 lbs right there) and gear for me and the missus for a few days...That might total out to be around 400 lbs or so.

As for speeds. well, controllable speeds on the long relatively clear cut roads, (40 or so) much much slower as things get cut up rocky and in need of 4wd...

2002 F-350, was a DRW, now a SRW (but kept the dana 80 ARB's front and back, 4.88 gears on 37's
AIS, 4 inch MBRP, 38R ww2, IHI bellowed up pipes
PHP 6 Pos Chip, swamps 140 volt mod
PMF coilovers and 4 link...front and back
2008 D60 up front, 2002 D80 out back
Psc hydro assist with ported hydroboost, p pump
fifty is offline  
post #5 of 8 Old 10-05-2011, 12:47 AM
DERAIL MOD!!!


 
351fifty's Avatar
 
Join Date: May 2011
Location: Canton and kennesaw
Posts: 23,180
Thanks: 34
Thanked 207 Times in 195 Posts
Mentioned: 1 Post(s)
Quoted: 3 Post(s)
Feedback Score: 4 reviews
Where are you stationed? And will you be able to air them back up when you get back on the beaten path when you return?

-Kris-
2000 excursion V10 2wd 230k
2000 Excursion 7.3 4x4 246k
1995 CCLB DRW 324K
2001 CCLB DRW 319K
Dp tuner infinity, exhaust, intake, chipped, tricked, and wrecked


Quote:
Originally Posted by marine5811
The stock downpipe in an OBS is flat because I'm a ginger.
Quote:
Originally Posted by alberta 7.3
Finding a decent woman is like shopping for a used truck. You spend most of your time picking through the money pits, wrecks, and basket cases until you find one that you can tolerate
Quote:
Originally Posted by JJFLASH
Well at least you caught the loose bolts before they cause any damage. Nothing worse than a sloppy hole
351fifty is offline  
post #6 of 8 Old 10-05-2011, 01:43 PM
Member
 
SmokeyAussie's Avatar
 
Join Date: Sep 2011
Location: Alberta, Canada
Posts: 75
Thanks: 7
Thanked 1 Time in 1 Post
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Quote:
Originally Posted by fifty View Post
Thanks for the info guys. The trails will be assorted...I am sure there will be wash board on parts, washed out on others

As for weight, I have an ARE shell on the back, plus two dogs (thats 125 lbs right there) and gear for me and the missus for a few days...That might total out to be around 400 lbs or so.

As for speeds. well, controllable speeds on the long relatively clear cut roads, (40 or so) much much slower as things get cut up rocky and in need of 4wd...
one other thing i thought of as i went bush lastnight and run a tire off the rim...dont corner too aggressively or to tight with a bit too much speed especially with lower tire pressure your tire will run straight off and you will be doing this like i did.

all you would want is a little bagging in the side walls, enough to soak up some of the rocks and other crap on the track and you should be sweet!
SmokeyAussie is offline  
post #7 of 8 Old 06-27-2012, 05:54 AM
Compression Ignition Addict
 
xjeeper's Avatar
 
Join Date: Jun 2008
Location: Naperville IL
Posts: 573
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
I run 25psi in mine on sand, 30 in mixed offroad, more for traction than ride.
xjeeper is offline  
post #8 of 8 Old 06-27-2012, 06:00 AM
Premium Member
 
Dan Lee's Avatar
 
Join Date: Oct 2008
Location: 89012
Posts: 131
Thanks: 0
Thanked 1 Time in 1 Post
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
You will notice an amazing difference, you will be fine at 20 psi running washboard roads. I didi a section that was really rough at street pressure in my other truck, drop it low to 20, stll handled great & absorbed so much of the bounce. An on board air compressor will be a good investment!
Dan Lee is offline  
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 Off
Trackbacks are On
Pingbacks are On
Refbacks are On

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