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Hello,

When the tires are cold, they all read the same pressure. As I am driving and they heat up, the passenger's front tire reads 2 PSI higher than the others. Has anyone else noticed this? Anyone know why?

I thought maybe the hot exhaust went near the tire and created extra heat, causing the PSI to rise.

I searched and saw other things about TPM, but not this.
 

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Ours do vary a little as well.
I have never noticed a pattern but will watch for one now and post back.
 

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more heat....alignment might a tad off...could be the slope of the road.....2 psi is nothing to worried about though....have you actually measured it with a physical gauge?
 

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Ralfcom said:
Hello,

When the tires are cold, they all read the same pressure. As I am driving and they heat up, the passenger's front tire reads 2 PSI higher than the others. Has anyone else noticed this? Anyone know why?

I thought maybe the hot exhaust went near the tire and created extra heat, causing the PSI to rise.

I searched and saw other things about TPM, but not this.
As you know, pressure has a relationship with temperature and volume via gas laws. Either the temperature of the gas inside the passenger tire increased or the volume of the other three tires diminished.
 

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How does this Temperature monitoring work??

I run Nitrogen in an HHR, no Temp. monitoring, & not sure if can put Nitrogen in Terrain tires & have no effect on TPM??
 

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Longwait4Train said:
How does this Temperature monitoring work??

I run Nitrogen in an HHR, no Temp. monitoring, & not sure if can put Nitrogen in Terrain tires & have no effect on TPM??
What has been your experience with the Nitrogen? Can you feel or measure a difference?
 
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Ralfcom said:
Hello,

When the tires are cold, they all read the same pressure. As I am driving and they heat up, the passenger's front tire reads 2 PSI higher than the others. Has anyone else noticed this? Anyone know why?

I thought maybe the hot exhaust went near the tire and created extra heat, causing the PSI to rise.

I searched and saw other things about TPM, but not this.
First off the TPMS are never accurate..they are accurate within 10% at best. 2psi difference is nothing when driving. I have a 3psi difference with cold pressure on the system on my driver front, but equal pressure on a calibrated master air pressure gauge.
 

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wbassnp007 said:
What has been your experience with the Nitrogen? Can you feel or measure a difference?
Subjective assessment is that ride is slightly smoother.
HHR with low profile tires transmits bumps pretty solidly, did notice daily drive was not quite as bumpy after Nitrogen in.
 
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IceMan said:
We only run 78% nitrogen in our '08 HHR...for free...skipping the extra 22% imagination charge.
I love that :)

And if you follow complete theory, its actually more than 78% nitrogen, since they say air leaks faster, and nitrogen doesnt, if your replacing loss air, the nitrogen has a slower leak down, so the next time you add air its obviously a higher % of nitrogen now :)
 

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IceMan said:
We only run 78% nitrogen in our '08 HHR...for free...skipping the extra 22% imagination charge.
LMAO ;D
 

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Longwait4Train said:
Subjective assessment is that ride is slightly smoother.
HHR with low profile tires transmits bumps pretty solidly, did notice daily drive was not quite as bumpy after Nitrogen in.
Any idea of what might be the cause of your subjective feeling of a smoother ride? Have you heard similar reports from friends or professionals? Without any experience with Nitrogen, what exactly convinced you to put the gas in your tires? Just curious!
 

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wbassnp007 said:
Any idea of what might be the cause of your subjective feeling of a smoother ride? Have you heard similar reports from friends or professionals? Without any experience with Nitrogen, what exactly convinced you to put the gas in your tires? Just curious!
Don't know the science to support smoother ride feeling.

Have it because our service garage/tire people are straight up & enthusiasts & it was free.

Quite a bit for & questioning it on the Internet.

Suggest you Google it as apparently can't post links here.

Here is one extract:

Drexan, a distributor of Parker Hannifin equipment in Canada, has released results from a nitrogen tire inlation trial in a long haul truck fleet. This study was partially funded by Transport Canada, the government department responsible for developing regulations, policies and services in the transportation industry.

The results of this analysis were remarkable, and recently presented at the Clemson Tire Conference:

• When compared to historical data, nitrogen tire inflation provides a 6.1% improvement in fuel efficiency when compared to a fleet with no tire pressure maintenance program

• When compared to historical data and an in-trial control, nitrogen tire inflation provides a 3.3% improvement in fuel efficiency when compared to a fleet using air inflation and a tire pressure maintenance program.

• When compared to the in-trial air control, nitrogen filled tires provided an average tread life improvement of 86% when compared to a fleet using air inflation and a tire pressure maintenance program.

• The study infers that casing life improves (increasing retreadability) and tire failures decrease.

The economic implications of nitrogen tire inflation were also impressive:

• Saved 110,000 gallons of diesel over the 9 month period ($285,000 US)

• The value of the extended tire life was not monetized, but could be easily calculated for any fleet that knows their cost/mile for tires.

• Greenhouse gas emissions were reduced allowing them to be exchanged for revenue on carbon trading sites.

This study was conducted over a 9 month period in 2006 using a fleet comprising 70 long haul tractors and 117 trailers, providing 1988 wheel positions. It consisted of 6.1 million tractor miles and 110 million tread miles. It covered the coldest and hottest months of the year to minimize climate variances. The analysis isolated inflation gas as the primary basis for any change in the mean.
 
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Longwait4Train said:
Don't know the science to support smoother ride feeling.

Have it because our service garage/tire people are straight up & enthusiasts & it was free.

Quite a bit for & questioning it on the Internet.

Suggest you Google it as apparently can't post links here.

Here is one extract:

Drexan, a distributor of Parker Hannifin equipment in Canada, has released results from a nitrogen tire inlation trial in a long haul truck fleet. This study was partially funded by Transport Canada, the government department responsible for developing regulations, policies and services in the transportation industry.

The results of this analysis were remarkable, and recently presented at the Clemson Tire Conference:

• When compared to historical data, nitrogen tire inflation provides a 6.1% improvement in fuel efficiency when compared to a fleet with no tire pressure maintenance program

• When compared to historical data and an in-trial control, nitrogen tire inflation provides a 3.3% improvement in fuel efficiency when compared to a fleet using air inflation and a tire pressure maintenance program.

• When compared to the in-trial air control, nitrogen filled tires provided an average tread life improvement of 86% when compared to a fleet using air inflation and a tire pressure maintenance program.

• The study infers that casing life improves (increasing retreadability) and tire failures decrease.

The economic implications of nitrogen tire inflation were also impressive:

• Saved 110,000 gallons of diesel over the 9 month period ($285,000 US)

• The value of the extended tire life was not monetized, but could be easily calculated for any fleet that knows their cost/mile for tires.

• Greenhouse gas emissions were reduced allowing them to be exchanged for revenue on carbon trading sites.

This study was conducted over a 9 month period in 2006 using a fleet comprising 70 long haul tractors and 117 trailers, providing 1988 wheel positions. It consisted of 6.1 million tractor miles and 110 million tread miles. It covered the coldest and hottest months of the year to minimize climate variances. The analysis isolated inflation gas as the primary basis for any change in the mean.
Just a FYI on this study http://www.trucknews.com/issues/story.aspx?aid=1000221072&type=Print%20Archives
 

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Wow! We've even decided to get tanks and start breathing the dern stuff..for better miliage...wear..and even the whole invironment,too. The hell with that regular plain ole air! Just no telling what other benefits will be discovered in the process! I think we should all do it as a fleet..since some of us have those bigger spare tires and still put on tons of rough miles. Just as long as it doesn't make you talk like Donald Duck...I think it would be just the nuts..!!! Hey Ladies..I even heard it was excellent for a clear complextion...and,very good chance..erectile dyslexia ;D
 

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Longwait4Train said:
Don't know the science to support smoother ride feeling.

Have it because our service garage/tire people are straight up & enthusiasts & it was free.

Quite a bit for & questioning it on the Internet.

Suggest you Google it as apparently can't post links here.

Here is one extract:

Drexan, a distributor of Parker Hannifin equipment in Canada, has released results from a nitrogen tire inlation trial in a long haul truck fleet. This study was partially funded by Transport Canada, the government department responsible for developing regulations, policies and services in the transportation industry.

The results of this analysis were remarkable, and recently presented at the Clemson Tire Conference:

• When compared to historical data, nitrogen tire inflation provides a 6.1% improvement in fuel efficiency when compared to a fleet with no tire pressure maintenance program

• When compared to historical data and an in-trial control, nitrogen tire inflation provides a 3.3% improvement in fuel efficiency when compared to a fleet using air inflation and a tire pressure maintenance program.

• When compared to the in-trial air control, nitrogen filled tires provided an average tread life improvement of 86% when compared to a fleet using air inflation and a tire pressure maintenance program.

• The study infers that casing life improves (increasing retreadability) and tire failures decrease.

The economic implications of nitrogen tire inflation were also impressive:

• Saved 110,000 gallons of diesel over the 9 month period ($285,000 US)

• The value of the extended tire life was not monetized, but could be easily calculated for any fleet that knows their cost/mile for tires.

• Greenhouse gas emissions were reduced allowing them to be exchanged for revenue on carbon trading sites.

This study was conducted over a 9 month period in 2006 using a fleet comprising 70 long haul tractors and 117 trailers, providing 1988 wheel positions. It consisted of 6.1 million tractor miles and 110 million tread miles. It covered the coldest and hottest months of the year to minimize climate variances. The analysis isolated inflation gas as the primary basis for any change in the mean.
Thanks for the insightful and reliable information. You got it for free.
 
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IceMan said:
Wow! We've even decided to get tanks and start breathing the dern stuff..for better miliage...wear..and even the whole invironment,too. The hell with that regular plain ole air! Just no telling what other benefits will be discovered in the process! I think we should all do it as a fleet..since some of us have those bigger spare tires and still put on tons of rough miles. Just as long as it doesn't make you talk like Donald Duck...I think it would be just the nuts..!!! Hey Ladies..I even heard it was excellent for a clear complextion...and,very good chance..erectile dyslexia ;D
The funny part....THe exact fleet that did this study, re-evaulated it, and now runs REGULAR AIR provided by a dealer I have worked with before. Enjoy that extra 17% nitrogen
 

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I would have the dealer swap out the sensor. I have never had issues with my cars. For a new car costing over $25000 have GM replace the sensor.
 

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Nitrogen is better for rubber, long term (Classic cars) tends to leak out a bit slower than air causing more uniform tire pressures/better mileage/wear. Ride is same. Pressure is pressure. For free......go for it!

Do not pay for it unless needed for constant, rim leak problem as w/ some alloy rims.

The TPMS is always a couple pounds off! It was designed to transmit a pressure drop/delta of at least 7-10 lbs of air, to avoid a high speed blow out. Not the way to optimize tire setting/wear/handling. It can always be mixed w plain old air ;D

Love the anecdotes!

MM
 
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