Goodyear F1 GS-D3 tires

[jedi]

Recently I purchased a full set of Goodyear F1 GS-D3 tires and had a alignment done. Great tires, My Vette just hugs the road. After I had them mounted and drove away one of the valve stems failed but I did not know it and drove the car about 200 miles. The car was pulling to the right so I took it back to the shop to have the alignment checked. They found the problem with the tire and fixed the valve stem, the tire pressure at this time was around 5psi. They took the tire off and checked the inside for damage, redid the alignment and rebalanced all the tires. My Vette drives great and I have recived at least 2.7 more MPG to around 19.7.

At $300 a tire should I be worried about tire failure down the road a few months or a year? These are not run flats so I am worried I caused some damage running around with a flat for so many miles. They also uped my PSI to around 40 with Nitrogen as this supposedly is better for the tires.

Comments?
Jedi

 

[Rain]

Pressure inside tires constantly seeks equilibrium with outside air pressure and over time cases tires to lose their pressure and deflate. Nitrogen has a slower rate or pressure loss.(compared to oxygen)
Tire stays inflated longer and grips the road better in all weather conditions.
You will see an increase in fuel economy.

Glad to hear you are running it in the new tires.. Did you get those thru Tire Rack.com or locally?

Rain

 

[Moonunit 451]

Pressure inside tires constantly seeks equilibrium with outside air pressure and over time cases tires to lose their pressure and deflate. Nitrogen has a slower rate or pressure loss.(compared to oxygen)
Tire stays inflated longer and grips the road better in all weather conditions.
You will see an increase in fuel economy.

Glad to hear you are running it in the new tires.. Did you get those thru Tire Rack.com or locally?

Rain

Slower rate of pressure loss, about 1 lb. a month with o2 apparenty, don't know about the other part. Rain, elaborate :confused

I run the D3's and have seen UGLY high speed failure. I would definately be concerned about damage to the tire from what you have described! Was this a front tire? Who is responsible for the stem failure?

If you are driving at high speeds valve stems are VERY important, and you should use non flexible anchored stems. Tire failure is the most common cause of high speed crashes in racing, and proper stems are critical for safety. I can post pics if neccesary.

 

[Rain]

more info I came across:

Nitrogen has been used on giant off-highway tires, on aircraft tires, and on racing tires for many years.

Air is about one-fifth oxygen, and oxygen, especially at high temperatures and pressures, is a very reactive element. When oxygen reacts with things, the process is called oxidation. When oxidation is extremely rapid, the process is called “burning.” That’s one reason nitrogen is used in off-highway and aircraft tires. These tires run so hot they can actually catch on fire. Nitrogen doesn’t support combustion, so nitrogen-filled tires don’t add fuel to the flames. And, nitrogen helps prevent slower forms of oxidation too.

Air migrates through rubber. Tires can lose 2 psi per month as a result of air passing through their sidewalls – like a balloon that shrivels up, but much slower. And, when oxygen passes through rubber, it can come into contact with steel cords, causing them to rust too. Between aging rubber and corroding steel cords, oxygen reduces retreadability.

While both nitrogen and oxygen can permeate rubber, nitrogen does it much more slowly. It might take six months to lose 2 psi with nitrogen, compared to just a month with air.

The air around us is full of water vapor. Water vapor in compressed air acts as a catalyst, accelerating rust and corrosion. Water vapor also absorbs and holds heat. And, when it changes from liquid to vapor, water expands tremendously in volume. So, tires inflated with wet air tend to run hotter and fluctuate in pressure more.

Hope this helps.

 

[Rain]

whew - and more than you EVER wanted to know -
Both FOR and AGAINST

The article can be found at this link:
http://www.trucktires.com/us_eng/library/publications/periodicals/RealAnswers/03v8iss3/ra8.asp

Some more links:
http://auto.howstuffworks.com/question594.htm
http://www.toyo.com.au/tech_info11.html
http://www.mtdealer.com/t_inside.cfm?action=art_det&storyID=1207
http://patft.uspto.gov/netacgi/nph-...,470,923.WKU.&OS=PN/6,470,923&RS=PN/6,470,923
http://www.tirelast.com/id5.html
http://www.prairiebizmag.com/article.asp?id=401

Your question has prompted me to search for a scientific explanation.

http://wine1.sb.fsu.edu/chm1045/notes/Gases/Diffuse/Gases09.htm
"The effusion rate, r, has been found to be inversely proportional to the square root of its molar mass and a lighter gas will effuse more rapidly than a heavy gas."

We know the molar mass for N2, air and O2 are 28, 29 and 32 respectively. So, N2 should actually effuse faster than air and O2.

http://www.trailerlife.com/cforum/i...ad/tid/14253029/gotomsg/14254472.cfm#14254472
"According to van der Waals equation for the behavior of non-ideal gasses, the a constant for N2 is 1.39 vs. 1.37 for N2/O2 mix (standard air). The b constant shows even less of a variation: 0.0391 for N2 vs. 0.0.0342 for the mix. It should be noted that the terms are both linear in the equation.
Also, plotting the PV/RT vs. pressure for 1 mole of gas shows that one must be in the pressure ranges of 100 atmospheres before appreciable differences in expansion behavior are noticed.

Given this, one would have to dismiss the arguments provided above, except perhaps the oxidizing effect provided by O2."

Some more opinions:
http://www.cartalk.com/content/columns/Archive/1997/September/05.html
"Their claim that nitrogen keeps your tire pressure more constant is actually correct. But their reasoning is wacko. It has nothing to do with diffusion of air through the rubber.

Seriously, you can keep your tire pressure constant enough for street and highway driving by simply checking it periodically."

http://www.trailerlife.com/cforum/index.cfm/fuseaction/thread/tid/14314827/srt/pa/pging/1/page/2.cfm
"Local tire store charges $6 a tire to fill with Nitrogen. Tech I know get a laugh every time someone goes for it. Says it the easiest money the store makes."

http://www.trailerlife.com/cforum/index.cfm/fuseaction/thread/tid/14397986/srt/pa/pging/1/page/2.cfm
"Unless you are racing, Nitrogen is just another scam. Industry site shows that a dealer must inflate approx. 100 tires a month to make the units pay for themselves.... read: sales pitch."

 

[jedi]

Glad to hear you are running it in the new tires.. Did you get those thru Tire Rack.com or locally?
Rain

Got them locally at Craven Tire and auto. Their great guys and most shops in the area send cars that need tires or wheel work to them. Thanks for the info BTW.
Jedi

 

[jedi]

whew - and more than you EVER wanted to know -
Both FOR and AGAINST

The article can be found at this link:
http://www.trucktires.com/us_eng/library/publications/periodicals/RealAnswers/03v8iss3/ra8.asp

Some more links:
http://auto.howstuffworks.com/question594.htm
http://www.toyo.com.au/tech_info11.html
http://www.mtdealer.com/t_inside.cfm?action=art_det&storyID=1207
http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=/netahtml/srchnum.htm&r=1&f=G&l=50&s1=6,470,923.WKU.&OS=PN/6,470,923&RS=PN/6,470,923
http://www.tirelast.com/id5.html
http://www.prairiebizmag.com/article.asp?id=401

Your question has prompted me to search for a scientific explanation.

http://wine1.sb.fsu.edu/chm1045/notes/Gases/Diffuse/Gases09.htm
"The effusion rate, r, has been found to be inversely proportional to the square root of its molar mass and a lighter gas will effuse more rapidly than a heavy gas."

We know the molar mass for N2, air and O2 are 28, 29 and 32 respectively. So, N2 should actually effuse faster than air and O2.

http://www.trailerlife.com/cforum/index.cfm/fuseaction/thread/tid/14253029/gotomsg/14254472.cfm#14254472
"According to van der Waals equation for the behavior of non-ideal gasses, the a constant for N2 is 1.39 vs. 1.37 for N2/O2 mix (standard air). The b constant shows even less of a variation: 0.0391 for N2 vs. 0.0.0342 for the mix. It should be noted that the terms are both linear in the equation.
Also, plotting the PV/RT vs. pressure for 1 mole of gas shows that one must be in the pressure ranges of 100 atmospheres before appreciable differences in expansion behavior are noticed.

Given this, one would have to dismiss the arguments provided above, except perhaps the oxidizing effect provided by O2."

Some more opinions:
http://www.cartalk.com/content/columns/Archive/1997/September/05.html
"Their claim that nitrogen keeps your tire pressure more constant is actually correct. But their reasoning is wacko. It has nothing to do with diffusion of air through the rubber.

Seriously, you can keep your tire pressure constant enough for street and highway driving by simply checking it periodically."

http://www.trailerlife.com/cforum/index.cfm/fuseaction/thread/tid/14314827/srt/pa/pging/1/page/2.cfm
"Local tire store charges $6 a tire to fill with Nitrogen. Tech I know get a laugh every time someone goes for it. Says it the easiest money the store makes."

http://www.trailerlife.com/cforum/index.cfm/fuseaction/thread/tid/14397986/srt/pa/pging/1/page/2.cfm
"Unless you are racing, Nitrogen is just another scam. Industry site shows that a dealer must inflate approx. 100 tires a month to make the units pay for themselves.... read: sales pitch."

Whoa! Umm...thanks??? Got a bit of time on your hands rain?

Jedi

 

[jedi]

I run the D3's and have seen UGLY high speed failure. I would definately be concerned about damage to the tire from what you have described! Was this a front tire? Who is responsible for the stem failure?

This was the back right tire. All I know is they said the valve stem failed and they replaced it. I had tire minders on it which are the visual indicators which show you when tire pressure is low by changing color. Apperently when they put the tire on they tightened the cap too tight and broke it the stem cap which lead to a slow(?) leak. To look at the tire you could not tell it was low as the side walls a very strong apperently and did not show the wear. Should I go back and have them replace the tire?
Jedi

 

[Rain]

Whoa! Umm...thanks??? Got a bit of time on your hands rain?

Jedi

Nah, not my original work. Found it in another forum discussion on whether it was a rip off or a good thing..