Go Back   EcoModder Forum > EcoModding > EcoModding Central
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 07-05-2015, 04:13 PM   #1 (permalink)
aero guerrilla
 
Piwoslaw's Avatar
 
Join Date: Oct 2008
Location: Warsaw, Poland
Posts: 3,541

Svietlana II - '13 Peugeot 308SW e-HDI 6sp
90 day: 58.1 mpg (US)
Thanks: 1,056
Thanked 630 Times in 396 Posts
Tire pressure vs temperature

I always check my tires' pressure before a trip, in the morning, before the sun warms them up. I keep them at the max sidewall of 51psi.

A few weeks ago I checked the pressure and noticed that all 4 tires are close to 60psi! Is it possible that if I pumped to 50psi on a cool morning (+5 to +10 C), then it would be 60psi on a warm morning (+15 C)? Or maybe I pumped to 60psi by accident (I often pump our bikes' tires to 65psi)?

__________________
e·co·mod·ding: the art of turning vehicles into what they should be

What matters is where you're going, not how fast.

"... we humans tend to screw up everything that's good enough as it is...or everything that we're attracted to, we love to go and defile it." - Chris Cornell

Piwoslaw's Peugeot 307sw modding thread

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 07-05-2015, 05:38 PM   #2 (permalink)
Master EcoModder
 
Join Date: Apr 2013
Location: World
Posts: 385
Thanks: 82
Thanked 82 Times in 67 Posts
Maybe model the air in the tire as the difference in volume between two cylinders and use P.V = m.R.T. Plug in the numbers and see what the difference in pressure works out to be.
  Reply With Quote
The Following User Says Thank You to Occasionally6 For This Useful Post:
Joggernot (07-06-2015)
Old 07-06-2015, 01:20 PM   #3 (permalink)
EcoModding Lurker
 
Join Date: Jul 2015
Location: NC
Posts: 38

Red Bean - '01 Chevrolet Metro
90 day: 34.44 mpg (US)
Thanks: 20
Thanked 3 Times in 2 Posts
I've never personally had this issue (as I'm almost always asleep in the morning lol), however I have been to a few service station air pumps that have faulty air gauges. Not sure how you pump your tires up but it's a good investment to have a good air gauge to check your tires. I've never had good readings from cheap gauges.
  Reply With Quote
Old 07-06-2015, 01:32 PM   #4 (permalink)
aero guerrilla
 
Piwoslaw's Avatar
 
Join Date: Oct 2008
Location: Warsaw, Poland
Posts: 3,541

Svietlana II - '13 Peugeot 308SW e-HDI 6sp
90 day: 58.1 mpg (US)
Thanks: 1,056
Thanked 630 Times in 396 Posts
The pressure gauge is integrated with the pump I use at home, and this is the only pump I use for the car and bike tires, so this rules out any variations between pumps/gauges.
__________________
e·co·mod·ding: the art of turning vehicles into what they should be

What matters is where you're going, not how fast.

"... we humans tend to screw up everything that's good enough as it is...or everything that we're attracted to, we love to go and defile it." - Chris Cornell

Piwoslaw's Peugeot 307sw modding thread

  Reply With Quote
Old 07-06-2015, 02:47 PM   #5 (permalink)
...beats walking...
 
Join Date: Jul 2009
Location: .
Posts: 6,191
Thanks: 179
Thanked 1,521 Times in 1,122 Posts
Our local Firestone Tire dealership has been kind enough to "check" all my pocket air-pressure gauges for me...checked against their *master* pressure regulator which they have checked/measured/calibrated every six months. They have a "T" shaped fitting that chucks onto their line while my gauge(s) connect onto one of the other two fittings...and we compare the numbers.
  Reply With Quote
Old 07-06-2015, 05:07 PM   #6 (permalink)
EcoModding Lurker
 
Join Date: Aug 2013
Location: United Kingdom
Posts: 29

Astra 1.7cdti - '03 Opel/Vauxhall Astra Eco4 cdti
Thanks: 32
Thanked 4 Times in 4 Posts
Quote:
Originally Posted by Piwoslaw View Post
I always check my tires' pressure before a trip, in the morning, before the sun warms them up. I keep them at the max sidewall of 51psi.

A few weeks ago I checked the pressure and noticed that all 4 tires are close to 60psi! Is it possible that if I pumped to 50psi on a cool morning (+5 to +10 C), then it would be 60psi on a warm morning (+15 C)? Or maybe I pumped to 60psi by accident (I often pump our bikes' tires to 65psi)?
I'd say this is normal, i find my tyre pressures rise with ambient temperature.
  Reply With Quote
Old 07-06-2015, 05:42 PM   #7 (permalink)
Cyborg ECU
 
California98Civic's Avatar
 
Join Date: Mar 2011
Location: Coastal Southern California
Posts: 6,092

Black and Green - '98 Honda Civic DX Coupe
Team Honda
90 day: 66.42 mpg (US)

Black and Red - '00 Nashbar Custom built eBike
90 day: 3671.43 mpg (US)
Thanks: 2,307
Thanked 2,025 Times in 1,380 Posts
Quote:
Originally Posted by Old Tele man View Post
Our local Firestone Tire dealership has been kind enough to "check" all my pocket air-pressure gauges for me...checked against their *master* pressure regulator which they have checked/measured/calibrated every six months. They have a "T" shaped fitting that chucks onto their line while my gauge(s) connect onto one of the other two fittings...and we compare the numbers.
... and what were your results? Were your gauges worth the (little) money you spent on them?
__________________
See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.



  Reply With Quote
Old 07-06-2015, 09:35 PM   #8 (permalink)
...beats walking...
 
Join Date: Jul 2009
Location: .
Posts: 6,191
Thanks: 179
Thanked 1,521 Times in 1,122 Posts
Quote:
Originally Posted by California98Civic View Post
... and what were your results? Were your gauges worth the (little) money you spent on them?
Two (dial gauge) were high at 40 psi...one read 41 psi, other read 42 psi.
One (pencil gauge) was low at 40 psi...it read 38 psi.

I've noted their errors on each gauge and am keeping records to see if those errors are getting worse or staying the same.


Last edited by gone-ot; 07-06-2015 at 09:41 PM..
  Reply With Quote
The Following User Says Thank You to gone-ot For This Useful Post:
California98Civic (07-06-2015)
Reply  Post New Thread


Thread Tools




Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com