Hi guys

I have just fitted aset of new Dunlop SP 7000 d sport tyres on my A4 3.0 multi. I was advised to inflate with nitrogen to keep pressure constant and also to keep tyres cooler and get better mileage.

Any views

Thanks

Hi

I've been using Nitrogen in my A4 1.8T and my previous Golf 4 for about 2 years. Must admit that I haven't noticed any major difference, although the pressures did seem to stay constant for a bit longer. I think F1 teams inflate with nitrogen for what it's worth (could be wrong though), although considering that normal air is about 80% nitrogen anyway I doubt you'd notice a huge difference anyway...

Nitrogen being less reactive that Oxygen should keept he tires cooler.. but I dont think this effect would be noticible.. but why not...... Give it a try...

Nitrogen atoms are larger that oxygen. The don't seep through the tyre which is porous so your pressure stays the same for much longer.

I have them in my car and never adjusted the pressure.

F1, Planes, space shuttle all use them.

Because they are larger and heavier (Not that you would notice) they keep the tyre cooler by moving more heat away from the tyre.

So essentially your tyre lasts longer. One wheel spin or hard corner and all that theory is out the window

 

CP

 

Edited: I have just been told that they are smaller than oxygen. Maybe my whole theory (as was told) is a load of cr@p. (How do I make a blushing face?)

Nitrogen is an Inert gas and is colder than Oxygen...look at any high school periodic table.

Salim is right - it is an inert gas ie acording to boyles law pv=nrt , expansion under temp is minimal when compared to air or oxygen, hence truck tyres use them coz the heat produce often leads to type expansion under a 30 tonn load and blow outs , or so i assume

Technicalities!

I prefer Nitrogen because it makes the tyres more consistant at higher temperatures (ie. when I am misbehaving). Also I never have to 'top up' the tyres anymore, as they keep the pressure.

Not a clue, or much interest why this happens, just happy it does.

Guys I am not an Engineer but **** it's close.
80% of the air is N and the rest is other gasses. Does it really make a difference?

Hi guys

I found some info on the web. www.nitralife.com

Cheers

I like Nitrogen in Tyres myself, I own two trucks and have had blowouts on brand new General tyres with 800 km on them and my claims get rejected with Bull**** excuses by Continental... Changed tyres, fill with Nitrogen now I get 30-40000 kms on tyres. I never use retreads BTW. Also Jhb to CPT on 27th December 2003 9h32 min including bathroom breaks and petrol/food stops in my poor Honda Accord, running Nitrogen in tyres, no problems with tyres...

Btw, have been told by a number of dealers including an idiot at Mercedes that nitrogen is unsafe as it is explosive

Obviously idiots thought it was NOS that TW&T were filling tyres up with.

I like the green valve caps....

Andre'

Why dunlops, and how have you found them? I have the same fitted to my 1.9TDi, but find their roadholding to be appauling - maybe its the 400Nm and the 120kW after chipping, but that should be pretty close to what the 3.0 is putting out?

Would nitrogen make any difference wrt making the tyres stick to the road?

Rich

http://auto.howstuffworks.com/nascar5.htm

Nitrogen Instead of Air

Most of the teams remove the air from the tires and replace it with nitrogen. Compressed nitrogen contains less moisture than compressed air. When the tire heats up, moisture in the tire vaporizes and expands, causing the pressure inside the tire to increase. Even small changes in tire pressure can noticeably affect the handling of the car. By using nitrogen instead of air, the teams have more control over how much the pressure will increase when the tires heat up

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I think water is the key here, water expands to over 19 times its volume when it changes from a liquid to a gas.