Discussion in 'Tyres & Alloys' started by Chaos, Jun 1, 2010.
Soft compound tyres or hard compound tyres
For what it's worth, found this is in eLearn for Linea
In my understanding, the tyre compound doesn't have any input in deciding on the tyre pressure.
Shall we stick to the same psi level of normal when filling nitrogen as well? I read in a thread where it was mentioned to fill less psi when filling nitrogen.
This is exactly what is mentioned in my 2009 Linea Owners Manual as well.
Pressure is pressure. Nitrogen or "normal air".
Although i do not know if there's another myth associated with this as well.
What is mentioned in the manual is cold tire pressure for normal compressed air.
Normal air expands more than nitrogen, when the tyres get hot
So, if one fills 33 psi normal compressed air, when the tyre gets hot, it will likely go up by 3 to 4 psi.
However, if one fills nitrogen, then even after the tyre gets warm / hot, the pressure would at best go up by 1 psi
Ergo, if you are filling after a drive long enough to get the tyres warm, you will need to fill 36 or 37 psi of compressed air to get 33 psi cold tyre pressure. With nitrogen, you may need to fill only 33 psi, under same circumstances.
All of this is theory and I am yet to see any concrete proof of the benefits of using nitrogen. On the contrary, I have seen that the readings of TPMS for a car with 2 tyres filled with nitrogen and the other 2 with compressed air did not show any difference. Maybe the nitrogen was not pure. I don't know. I am sticking with compressed air.
No use of nitrogen,i feel normal air is better , also its free and freely available.I fill 34 psi in front and 32-33 rear
Hi Guys ...
Needed some advice on tyre pressure.I have a Punto 90hp with 195 tyres
Pals suggest what should be the pressure to be maintained for nitrogen.
The place where i got nitrogen filled suggested me to keep 40 for good mileage and tyre life.
The logic given by him was at high way the pressure of air increases to 40 from 32(when inflated with air )
Incase of nitrogen the pressure remains the same so its good to keep 40.
Currently i am using 32 pressure as per the chart.pls advice..thanks in advance.
40 is not the correct pressure for the tyres, 32 is perfect even with Nitrogen filled in. Over inflating tyres can cause the tyre damage
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