51psi? - Page 2 - Focus Fanatics
Ford Focus Forum
HomeContact UsAbout UsGalleryDiscussion ForumsMarketplace



Go Back   Focus Fanatics > Ford Focus Tech Discussions > Wheels & Tires - Sponsored By Tire Rack

Wheels & Tires - Sponsored By Tire Rack The place to go for answers on wheel types, tire sizes, offset, wheel patterns and more.
Sponsored By:
Tire Rack


Search This Forum | Image Search | Advanced Search    
FocusFest Ford Focus Tire & Wheels FocusFanatics Merchandise

Reply
 
Thread Tools Display Modes
Old 05-02-2013, 08:47 PM   #11
Elizabeth
Focus Fanatic
 
Elizabeth's Avatar
 
Join Date: Aug 2011
Fan#: 89280
Location: SouthEast, WI
What I Drive: '12 Yellow Focus SE stick, 17"rims

Posts: 2,697
FF Reputation: 14 Elizabeth Great Standing Member
Buy-Sell-Trade Rating: (0)
It is true going up to the max cold PSi rated for the tire is not a good idea.

IMO the tire pressure on the car door is all about compromise.
Ride quality, wear, and safety.

Ride quality is a biggie in the equation. Lower than optimum tire pressures for handling are great for ride comfort.

I really have to laugh at the idea some guy claims he sees 'overinflation' problems all the time. BS. I call BS.
90% of the time tires are underinflated. And the few folks who bother to raise the PSI ARE paying attention to thier tires.

My Focus is supposed to be at 35psi. I keep the rear ar 40 PSi and front at 45psi.
Elizabeth is online now  
    Reply With Quote
Sponsored Links
Advertisement
 
Old 05-02-2013, 08:59 PM   #12
jsr72
Focus Enthusiast
 
Join Date: Apr 2012
Fan#: 97393
Location: n/a, United States
What I Drive: 2012 Focus SE

Posts: 242
FF Reputation: 4 jsr72 Good Standing Member
Buy-Sell-Trade Rating: (0)
Quote:
Originally Posted by AZfocus2012 View Post
To me the door jam number is a bottom number not to go below, because it is so close to being under inflated anything less would be dangerous.
Sometimes, but not always. My 91H rated factory tires are good to carry 595kg each at the 240kPa/35psi door sticker. The maximum front gross axle load according to my label is 940kg, So there an extra 125kg of reserve per tire when the car is loaded to its max.

That being said, it is a very good idea to follow the sticker, at minimum, as it represents an optimum of the tradeoffs as deemed by the manufacturer.
jsr72 is offline  
    Reply With Quote
Old 05-02-2013, 09:04 PM   #13
Creative
Focus Enthusiast
 
Join Date: Jan 2013
Fan#: 108024
Location: N/A, NJ
What I Drive: 2013 Ford Focus

Posts: 427
FF Reputation: 3 Creative Good Standing Member
Buy-Sell-Trade Rating: (5)
I recomend 40-45 psi but I autoX and honestly don't care about my tires duration that much.
__________________
Quote:
Originally Posted by Dialed View Post
Let's be honest guys, car modding is not synonymous with warranty-covered cars.

As the old saying goes, you have to pay to play.
Creative is offline  
    Reply With Quote
Old 05-02-2013, 09:07 PM   #14
bringler26
FUBARCUS
 
bringler26's Avatar
 
Join Date: Oct 2008
Fan#: 59705
Location: Mentor, OH
What I Drive: 03 ZX3 & 07 Impreza 2.5i

Posts: 5,657
FF Reputation: 29 bringler26 Great Standing Member
Buy-Sell-Trade Rating: (5)
I usually run 3-4 PSI more depending on the tire. I notice with some that they are under inflated with a super soft sidewall. I like a little bit firmer ride as well so the small bump firms it slightly. Never had wear issues.
__________________
2003 Ford Focus ZX3("FUBARCUS" was "Brokus") - old and still busted
2007 Subaru Impreza 2.5i - current DD
Quote:
Originally Posted by zetecDon View Post
I always moderate naked!
bringler26 is offline  
    Reply With Quote
Old 05-02-2013, 09:18 PM   #15
AZfocus2012
Focus Addict
 
AZfocus2012's Avatar
 
Join Date: Dec 2011
Fan#: 92484
Location: Apache Junction, AZ
What I Drive: 2012 White Platinum SEL 303A Focus

Posts: 658
FF Reputation: 2 AZfocus2012 Good Standing Member
Buy-Sell-Trade Rating: (0)
It is pretty simple. Don't go below the number in the door jam and don't go over the max psi number on the tire. Anywhere in between and you will be ok. Don't let anyone make you fear running 40psi or even 48psi. The ride comfort will be better near 35 but it will suck for aggressive cornering. Set your inflation in accordance with how you drive and what you want from the tire.
AZfocus2012 is offline  
    Reply With Quote
Old 05-02-2013, 09:20 PM   #16
2012silversel
Focus Addict
 
2012silversel's Avatar
 
Join Date: Mar 2011
Fan#: 83969
Location: Mpls., MN
What I Drive: 2014 C-Max Energi, Sterling Gray

Posts: 785
FF Reputation: 1 2012silversel Good Standing Member
Buy-Sell-Trade Rating: (1)
Quote:
Originally Posted by Juicedz View Post
I didn't set it there but what I observed On the tire. I set it slightly over 40 psi. Temps get hot in Florida so I worried about the increase in pressure from heat. Sounds like I should take it a little lower though.
Exactly, psi increases 1 lb for every 10 degree rise in temp. Lets say you set your pressure today at 41 psi and the temp is 70, you drive and the tire heats up 30 degrees and now your at 43, in a week the temp is 90, the road is hotter and you tire heats up 40 degrees, now add 6 more psi and your rolling psi is at 47. Like what's already been said, the trade off for 1-2 mpg's isn't worth early tire replacement or a possible blow out. People with big brains and smart calculators have designed and determined the tire should be inflated to 35psi for safe, efficient and long life, I stick with the recommended pressure on the door sticker.
2012silversel is offline  
    Reply With Quote
Old 05-02-2013, 09:26 PM   #17
bringler26
FUBARCUS
 
bringler26's Avatar
 
Join Date: Oct 2008
Fan#: 59705
Location: Mentor, OH
What I Drive: 03 ZX3 & 07 Impreza 2.5i

Posts: 5,657
FF Reputation: 29 bringler26 Great Standing Member
Buy-Sell-Trade Rating: (5)
Quote:
Originally Posted by 2012silversel View Post
Exactly, psi increases 1 lb for every 10 degree rise in temp. Lets say you set your pressure today at 41 psi and the temp is 70, you drive and the tire heats up 30 degrees and now your at 43, in a week the temp is 90, the road is hotter and you tire heats up 40 degrees, now add 6 more psi and your rolling psi is at 47. Like what's already been said, the trade off for 1-2 mpg's isn't worth early tire replacement or a possible blow out. People with big brains and smart calculators have designed and determined the tire should be inflated to 35psi for safe, efficient and long life, I stick with the recommended pressure on the door sticker.
Does the explorer ring a bell Ford originally said to only inflate to 29psi against Firestone's recommendation and had blow out problems. Not every tire is the same so some may be better with a little more or less. 35psi works great for the factory equipment. It is really a combination of preference and safety.


In general(just as discussion really) Over and under inflation can both cause blowouts. Under inflation can over heat the plys and cause separation.
__________________
2003 Ford Focus ZX3("FUBARCUS" was "Brokus") - old and still busted
2007 Subaru Impreza 2.5i - current DD
Quote:
Originally Posted by zetecDon View Post
I always moderate naked!
bringler26 is offline  
    Reply With Quote
Old 05-02-2013, 09:31 PM   #18
Joeywhat
Strichmädchen & Koks
 
Joeywhat's Avatar
 
Join Date: Apr 2011
Fan#: 85247
Location: Brighton, MI
What I Drive: 2014 Mustang 3.7L SGM

Posts: 2,610
FF Reputation: 9 Joeywhat Good Standing Member
Buy-Sell-Trade Rating: (1)
Unless RACECAR, I would keep it close to recommended pressures.

High pressures are nice for better "feel" from the tires in terms of "dynamic driving" and such, but it also makes you feel every pebble in the road that much more, and can increase chance of punctures.

I typically put mine a few PSI above recommended by the manufacture. With my newer (lower profile) tires I do inflate them a few more above that. Anything more and it's like riding on steel rollers.
__________________
Hatch Nation #29
Joeywhat is offline  
    Reply With Quote
Old 05-02-2013, 09:43 PM   #19
bringler26
FUBARCUS
 
bringler26's Avatar
 
Join Date: Oct 2008
Fan#: 59705
Location: Mentor, OH
What I Drive: 03 ZX3 & 07 Impreza 2.5i

Posts: 5,657
FF Reputation: 29 bringler26 Great Standing Member
Buy-Sell-Trade Rating: (5)
I went to an autox and bumped my pressures about 10 psi higher than normal and I forgot to drop them to normal after and man did it ride rough took me a while to figure out why small cracks felt like mountains.
__________________
2003 Ford Focus ZX3("FUBARCUS" was "Brokus") - old and still busted
2007 Subaru Impreza 2.5i - current DD
Quote:
Originally Posted by zetecDon View Post
I always moderate naked!
bringler26 is offline  
    Reply With Quote
Old 05-02-2013, 10:04 PM   #20
AZfocus2012
Focus Addict
 
AZfocus2012's Avatar
 
Join Date: Dec 2011
Fan#: 92484
Location: Apache Junction, AZ
What I Drive: 2012 White Platinum SEL 303A Focus

Posts: 658
FF Reputation: 2 AZfocus2012 Good Standing Member
Buy-Sell-Trade Rating: (0)
Here is a link to an article by someone who may have some knowledge of tires and psi's. Some good info, backing up and debunking some of what has been said here.

http://www.popularmechanics.com/cars...unked-10031440
AZfocus2012 is offline  
    Reply With Quote
Reply

Bookmarks & Social Networks

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

Forum Jump


All times are GMT -5. The time now is 07:35 AM.


Copyright 2002-2014 FocusFanatics.com. All Rights Reserved : Terms of Use : Privacy Policy : Advertise Information : Site Map

Focus Fanatics Ford Focus Forum offers many fun ways for you to engage with other Ford Focus Owners from across the world. Whether it be about the aftermarket performance modifications, technical how-to's, European tuned suspension or awesome fuel economy similar to the Acura TLX or Fiesta ST. You can find all Ford Focus and Focus ST related information here. Join our Ford Focus discussion forums and chat with local Focus enthusiasts in your area.