What Tire Pressures Do You Run? - Page 3 - Jeep Garage - Jeep Forum

Go Back   Jeep Garage - Jeep Forum > Jeep Platform Discussion > Grand Cherokee - WK2 - > Suspension/Driveline/Brakes/Wheels/Tires

Join Jeep Garage Today
Reply
 
Thread Tools Display Modes
 
  #25  
Old 08-30-2015, 11:26 AM
billt's Avatar
Senior Member
My Jeep: 2015 5.7L WK2
 
Join Date: Mar 2015
Location: Glendale, Arizona
Posts: 1,348
Thanks: 321
Thanked 263 Times in 183 Posts
Rep Power: 2031
billt is on a distinguished road
Re: What Tire Pressures Do You Run?

Quote:
Originally Posted by JTS97Z28 View Post
Just curious, since you are in such a hot location, what do your tires end up going up to with them set at 44/45 psi cold? Those things have to see 50psi eventually right? assuming you aren't running nitrogen.
I can say I've honestly never checked after driving. I always check cold, before I start out. It's just a habit I've gotten into, since every tire I've ever purchased mentions cold inflation pressure. I'm sure they climb up a little after driving, especially in the hotter Summer months.

As I mentioned, the manufacturer sets the Maximum cold inflation pressure right on the sidewall. I'm sure they've engineered fluctuation into that figure when they derived it, concerning heat buildup. So I can say I really don't worry about it.

If, for example, they come up with 44 PSI as a maximum cold inflation pressure, it stands to reason they expect the tire to go up in pressure from that figure when it heats up. Just as the mid range door jam figure will do the same. In that regard the maximum cold inflation pressure is not the maximum overall pressure the tire is capable of being run at safely. And correct me if I'm wrong, but I have never heard of a tire being run at different pressures, that are governed by different temperature climates. So based on that, maximum "cold" inflation pressure could have a very large range if someone ran it in Fairbanks in January, or Phoenix in June.

Reply With Quote
Sponsored Links
Advertisement
 
  #26  
Old 08-30-2015, 11:56 AM
MDBones's Avatar
OVERLAND HIGH ALTITUDE
My Jeep: 2016 3.6L WK2
 
Join Date: Mar 2014
Location: Wisconsin's West Coast
Posts: 3,592
Thanks: 630
Thanked 613 Times in 503 Posts
Rep Power: 10616
MDBones has a reputation beyond reputeMDBones has a reputation beyond reputeMDBones has a reputation beyond reputeMDBones has a reputation beyond reputeMDBones has a reputation beyond reputeMDBones has a reputation beyond reputeMDBones has a reputation beyond reputeMDBones has a reputation beyond reputeMDBones has a reputation beyond reputeMDBones has a reputation beyond reputeMDBones has a reputation beyond repute
Garage
Re: What Tire Pressures Do You Run?

I run mine at the vehicle manufacturer's recommended inflation. That's what the tire manufacturer recommends as well.
__________________
http://www.jeepgarage.org/members/54562-albums357-picture4289.png
Reply With Quote
  #27  
Old 08-30-2015, 11:57 AM
JTS97Z28's Avatar
Premium Member
My Jeep: 2015 3.6L WK2
 
Join Date: Jan 2011
Location: Plainfield, IL
Posts: 3,868
Thanks: 90
Thanked 620 Times in 456 Posts
Rep Power: 28715
JTS97Z28 has a reputation beyond reputeJTS97Z28 has a reputation beyond reputeJTS97Z28 has a reputation beyond reputeJTS97Z28 has a reputation beyond reputeJTS97Z28 has a reputation beyond reputeJTS97Z28 has a reputation beyond reputeJTS97Z28 has a reputation beyond reputeJTS97Z28 has a reputation beyond reputeJTS97Z28 has a reputation beyond reputeJTS97Z28 has a reputation beyond reputeJTS97Z28 has a reputation beyond repute
Re: What Tire Pressures Do You Run?

Since we are on topic monitor your pressures and see what they go up to. On a hot summer day with cold pressures set to 38psi mine will get up to 41psi. I know it doesn't matter, but gives you something to watch next time you drive :-)
Looks like My OCD self has to fine tune my pressures later lol.

__________________
2015 Jeep Grand Cherokee High Altitude, Bright White, V6, HK audio
Reply With Quote
The Following User Says Thank You to JTS97Z28 For This Useful Post:
  #28  
Old 08-30-2015, 12:07 PM
billt's Avatar
Senior Member
My Jeep: 2015 5.7L WK2
 
Join Date: Mar 2015
Location: Glendale, Arizona
Posts: 1,348
Thanks: 321
Thanked 263 Times in 183 Posts
Rep Power: 2031
billt is on a distinguished road
Re: What Tire Pressures Do You Run?

Quote:
Originally Posted by JTS97Z28 View Post
Since we are on topic monitor your pressures and see what they go up to. On a hot summer day with cold pressures set to 38psi mine will get up to 41psi. I know it doesn't matter, but gives you something to watch next time you drive :-)
Looks like My OCD self has to fine tune my pressures later lol.

That's a good idea. I'll have watch mine the next time I go out. I'll just pull it up on the screen in the garage, and leave it up to see if they increase, and by how much. It will be interesting to do it in cooler weather, then again in hot, to see how much difference there is. The screen makes it easy.
Reply With Quote
  #29  
Old 08-30-2015, 05:36 PM
Member
My Jeep: 2015 3.6L WK2
 
Join Date: Jun 2015
Location: Los Angeles
Posts: 60
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 658
GeminiRam has disabled reputation
My stock 20" has a standard 36 PSI on door panel. It was delivered to me at 38 PSI when cold, goes up to 41 in hot drives in LA that reaches 100 degrees. I just left it at that as it's in normal range.

I always thought running at standard within range is the best. Of course there are underdeflated tires but people have to check routinely. I'm surprised to see that running at 44 PSI cold is good for the tire. Can only imagine it wld be around 48 PSI in hot days. Wonder if that's more prone to tire pop going 80+ mph in highway at 100 degrees pavement. More of a safety issue.

Do we have a tire specialist/pro to confirm?
Reply With Quote
  #30  
Old 08-30-2015, 08:18 PM
billt's Avatar
Senior Member
My Jeep: 2015 5.7L WK2
 
Join Date: Mar 2015
Location: Glendale, Arizona
Posts: 1,348
Thanks: 321
Thanked 263 Times in 183 Posts
Rep Power: 2031
billt is on a distinguished road
Re: What Tire Pressures Do You Run?

I'm just not understanding this relationship everyone seems to have with tires "popping" at higher pressures? Then there is this:

http://www.cartalk.com/content/it-po...ssure-find-out

"Bill spent his career as a tire engineer, and now runs a company called TFI: Tire Forensics Investigation -- which we expect to see on CBS next fall.

Bill says that over-inflation almost never causes tire failure. The standard tire is inflated to about 30 to 35 pounds per square inch. Under hot weather and highway conditions, the temperature of the air inside the tire rises about 50 degrees. That increases the pressure inside the tire about 5 psi. The burst pressure of a tire is about 200 psi. So unless you had your tires pumped up to 195 psi (trust us, you didn't), you didn't come anywhere near bursting the tire from too much internal pressure.

Bill says if you're going to make a mistake in inflating your tires, it's much better to over-inflate them a bit than under-inflate them. There are really no horrible ramifications of over-inflating the tires by 10 or 15 psi......
Reply With Quote
  #31  
Old 08-30-2015, 10:01 PM
Member
 
Join Date: Aug 2010
Posts: 415
Thanks: 5
Thanked 50 Times in 45 Posts
Rep Power: 2762
Nonstop is on a distinguished road
Re: What Tire Pressures Do You Run?

Tires are designed with proper inflation pressures for contact patch and structural efficiency, exceeding or failing to meet these pressure will alter a tires performance,safety and more.
Regardless if I can overinflate a tire to achieve a desired ride characteristic or if I won't blow them up until 200psi. The braking, handling and safety of the vehicle are significantly altered by improper inflation, not saying door sticker or tires max are right, don't use the tire rated max pressure for daily it's wrong period. The same tires are on many different vehicles so no the same rated pressure might not be perfect for you but over inflating a tire is bad for more than the tire. Think loosing 5 feet of braking distance over a proper inflation press, and significant loss in the wet.
__________________
2011 X 3.6
2000 WJ 5.2
Reply With Quote
  #32  
Old 08-31-2015, 03:05 AM
08Hemi's Avatar
Senior Member
My Jeep: 2014 6.4L WK2
 
Join Date: Jun 2009
Location: Santa Barbara, CA
Posts: 4,963
Thanks: 140
Thanked 166 Times in 141 Posts
Rep Power: 368925
08Hemi has a reputation beyond repute08Hemi has a reputation beyond repute08Hemi has a reputation beyond repute08Hemi has a reputation beyond repute08Hemi has a reputation beyond repute08Hemi has a reputation beyond repute08Hemi has a reputation beyond repute08Hemi has a reputation beyond repute08Hemi has a reputation beyond repute08Hemi has a reputation beyond repute08Hemi has a reputation beyond repute
Garage
Re: What Tire Pressures Do You Run?

Use the PSI off of the tire...plain and simple. I just put 295/45r20 Toyo ST II's on the SRT (non-run flats)...max is 50 PSI, I am running them at 35 cold...with them up to 40 PSI this weekend in 110 degree weather. I plan to add 3-4 PSI for a 39-40 PSI cold. Filled with Nitrogen FYI
__________________


2014 WK2 SRT aka "Jack" aFe Pro Dry-S, Corsa Cat-back, BT Goodies, Full LED's, Tint and mostly blacked-out
2008 WK 5.7L Limited aka "Jill" (Sold)
Reply With Quote
  #33  
Old 08-31-2015, 05:44 AM
bob r's Avatar
Member
My Jeep: 2014 3.0L WK2
 
Join Date: Feb 2014
Location: Melbourne, Australia
Posts: 60
Thanks: 8
Thanked 1 Time in 1 Post
Rep Power: 1137
bob r is on a distinguished road
Re: What Tire Pressures Do You Run?

I hv had tyre issues wearing out in the middle and both jeep and a tyre supplier hv told me I am running them at too high a pressure
Told never exceed 2 psi over recommended cold inflation


Sent from my iPhone using JeepGarage
Reply With Quote
  #34  
Old 08-31-2015, 08:20 AM
Member
 
Join Date: Aug 2010
Posts: 415
Thanks: 5
Thanked 50 Times in 45 Posts
Rep Power: 2762
Nonstop is on a distinguished road
Re: What Tire Pressures Do You Run?

This is again fun to watch and a total shame. The loss of money, performance, and safety is measurable right here. Safety, read safety. It's all about the contact patch.
__________________
2011 X 3.6
2000 WJ 5.2
Reply With Quote
  #35  
Old 08-31-2015, 09:28 AM
Mozzie's Avatar
Member
My Jeep: 2014 3.6L WK2
 
Join Date: Jan 2014
Location: Sydney, Australia
Posts: 477
Thanks: 23
Thanked 107 Times in 82 Posts
Rep Power: 1585
Mozzie is on a distinguished road
Re: What Tire Pressures Do You Run?

The maximum pressure rating is at maximum weight for that tyre. Over-pressure will minimise stopping distance due to over-inflation. The guide is 2-3 psi above the door sticker to get best results. The sticker is slightly lower to produce a softer comfortable ride. I my years I found this lower pressure will also produce an uneven wear.

See this document from Cooper tyres for more details.
Attached Files
File Type: pdf Cooper_tire_pressure.pdf (840.1 KB, 8 views)
Reply With Quote
  #36  
Old 08-31-2015, 11:37 AM
08Hemi's Avatar
Senior Member
My Jeep: 2014 6.4L WK2
 
Join Date: Jun 2009
Location: Santa Barbara, CA
Posts: 4,963
Thanks: 140
Thanked 166 Times in 141 Posts
Rep Power: 368925
08Hemi has a reputation beyond repute08Hemi has a reputation beyond repute08Hemi has a reputation beyond repute08Hemi has a reputation beyond repute08Hemi has a reputation beyond repute08Hemi has a reputation beyond repute08Hemi has a reputation beyond repute08Hemi has a reputation beyond repute08Hemi has a reputation beyond repute08Hemi has a reputation beyond repute08Hemi has a reputation beyond repute
Garage
Re: What Tire Pressures Do You Run?

Quote:
Originally Posted by bob r View Post
I hv had tyre issues wearing out in the middle and both jeep and a tyre supplier hv told me I am running them at too high a pressure
Told never exceed 2 psi over recommended cold inflation


Sent from my iPhone using JeepGarage

That uneven wear is exactly what happened with my run flats (OEM Pirelli's, SRT)...I had them at 34 PSI (cold, door recommendation w/ regular air) and the inner tread was GONE, almost like slicks down the middle...outters were fine (had 3-5k miles left), replaced with less than 12k miles of use . Maybe they needed more PSI? I did buy it used so who knows what happened to the tires in the first 3k miles; I do know that I was HARD on them for 8k miles !!

Am I correct in saying that the door PSI recommendation is for the OEM tires for that specific vehicle? To me, since I have switched to non-run flats, that recommendation does not apply. Am I totally off? Thoughts? I know you never want to be at max (on tire recommendation) PSI, hot or cold...but want to make sure that I am approaching this correctly...

I plan to rotate my Toyo's often and re-balance (Road Force)/align when needed as it is all covered in the plan I got from Big Brand. I have no shimmy @ +80mph so right now the tires are setup great and no pull on the wheel L or R. MPG's are up (+2 mpg's @ 75 mph, full Jeep w/ A/C on) and the ride is great, so I am going to stick with this PSI...then see what they say at Big Brand after a couple hundred more miles. Will go in within the next month to see how everything is looking and adjust accordingly.
Reply With Quote
Reply

Thread Tools
Display Modes

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Temps and Pressures Grand Cherokee MMAG4X4 Engine Performance/Intakes/Exhausts 2 08-21-2014 03:17 PM
EVIC tire pressures 46er Trouble Shooting/Problems/Service 5 07-26-2014 06:48 PM
Recommended Tire Pressures mswlogo Grand Cherokee - WK2 - 34 12-13-2013 04:37 AM
18" Tire pressures? SW03ES Suspension/Driveline/Brakes/Wheels/Tires 13 12-18-2011 07:17 PM
Tire pressures holding scittb Trouble Shooting/Problems/Service 5 07-18-2011 08:06 PM

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 02:50 PM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Copyright 2012 - JeepGarage.Org
The Jeep Grand Cherokee Owners Community

JeepGarage.org is in no way associated with or endorsed by FCA US LLC. Chrysler, Dodge, Jeep, Ram, Mopar and SRT are registered trademarks of FCA US LLC.