Filling tires with Nitrogen

MMamdouh · Post by **MMamdouh** » Sun Dec 10, 2006 10:37 pm

anyone tried this? is it going to do any good to the ride and handling?

MMamdouh

bluesheepbrian · Post by **bluesheepbrian** » Sun Dec 10, 2006 11:57 pm

Had my done, all four brand new tires. Honestly didn't find any difference specially in the winter.

Post by **PrecisionBoost** » Sun Dec 10, 2006 11:58 pm

Nitrogen filled tires last longer, get better fuel economy and I'm not sure about performance.

I'm pretty sure there are lots of race teams using nitrogen.... the pressure stays more consistant as the tire is being heated up.

So.... it means that you don't have to change the pressure of the tire as much as it moves from hot to cold to hot.

MMamdouh · Post by **MMamdouh** » Mon Dec 11, 2006 7:59 am

i am always under inflate my tires specially in the summer as the heat makes air expand more and the car feels like a rock... i guess with nitrogen i can set the pressure as per the manufacturer's recommendation (32psi) without having to worry about pressure difference.

also some reviews said that nitrogen filled tires doesn't leak as much as the air filled ones due to the bigger size molecules of nitrogen or so... can anyone confirm that?

MMamdouh

kinkyllama · Post by **kinkyllama** » Mon Dec 11, 2006 6:08 pm

chris@PrecisionBoost wrote:Nitrogen filled tires last longer, get better fuel economy and I'm not sure about performance.

I'm pretty sure there are lots of race teams using nitrogen.... the pressure stays more consistant as the tire is being heated up.

So.... it means that you don't have to change the pressure of the tire as much as it moves from hot to cold to hot.

How do they get better fuel economy and last longer?

It is ideal for tires that see the track as like you said they tempature doesn't change as much but allot of racers don't even bother with it cuz they know exactly how much the tire changes in tempature with regular air.

MMamdouh · Post by **MMamdouh** » Tue Dec 12, 2006 12:36 am

kinkyllama wrote:How do they last longer?

some people argue that the lack of oxygen in the tire prevent its deterioration or "rotting"... again some other people said that a tire will go bald way faster than it will actually rot.

will try to find that long debate i was reading about the subject.

MMamdouh

MMamdouh · Post by **MMamdouh** » Tue Dec 12, 2006 12:39 am

got it:

http://www.eng-tips.com/viewthread.cfm? ... 996&page=1

MMamdouh

Post by **PrecisionBoost** » Tue Dec 12, 2006 2:05 am

kinkyllama wrote: How do they get better fuel economy and last longer?

It is ideal for tires that see the track as like you said they tempature doesn't change as much but allot of racers don't even bother with it cuz they know exactly how much the tire changes in tempature with regular air.

If the tire pressure stays more consistent your fuel economy will be better.... and keep in mind that the geometry and thus contact patch changes with pressure as well.

I realize that most racers have a very good idea about where their pressure is going to be.... it's just that nitrogen is more consistant than regular compressed air.

I think it has something to do with the water vapor during heat cycling.... pure nitrogen contains zero water.... can't remember the details.... all I know is that nitrogen tires don't change pressure as much as ones filled with regular compressed air.... especially at the race track

Post by **PrecisionBoost** » Tue Dec 12, 2006 2:11 am

MMamdouh wrote:got it:

http://www.eng-tips.com/viewthread.cfm? ... 996&page=1

MMamdouh

I love eng-tips..... I just read the thread and there was a good statement to back up what I said.....

The biggest reason to use compressed nitrogen *in a racing tire* is that it's dry, compared to typical compressed air.

When a tire heats up, the air and any moisture inside it heats up as well. When the moisture inside the tire heats up, the water molecules move further apart, increasing the tire pressure. By removing this moisture, the pressure stays more consistent over the entire heat cycle of the tire.

On a racecar, a 1/4 psi difference can change the handling of a car significantly. The humidity inside a tire does not have to be zero, but if it is not at least kept consistent from one set of tires to another, to equal a 1/4 psi increase in the current set, a 1 psi change may need to be made in another set because of the differing humidities.

Is nitrogen completely necessary? No. Air can be dried using inline air dryers and such. However, it's much easier to keep tire humidity consistent when all the tires can be filled from the same 1500 psi bottle of nitrogen delivered to the shop.