air pressure for GY Silent Armor load D?
#16
12-06-2011, 10:37 AM
Senior Member
#17
12-06-2011, 01:53 PM
but the shop uses nitrogen and I thought that nitrogen wasn't supposed the change that much with air temperature?
Anyway for giggles I took them down to 44 psi just to see what would happen on my 20 mile commute to work. Once I got to work they were just a shade under 50psi after the 20 mile hwy drive.
If used the calculations I think I would be in the mid 30's psi but this is very rough as I'm not sure of the weight of my truck let alone weight per axle. I think I feel more comfortable with a minimum of 40-45psi for an general air pressure with out needing to air up for loads as an air compressor isn't always easily accessible. This unless I see excess wear in the center.
Anyway for giggles I took them down to 44 psi just to see what would happen on my 20 mile commute to work. Once I got to work they were just a shade under 50psi after the 20 mile hwy drive.
If used the calculations I think I would be in the mid 30's psi but this is very rough as I'm not sure of the weight of my truck let alone weight per axle. I think I feel more comfortable with a minimum of 40-45psi for an general air pressure with out needing to air up for loads as an air compressor isn't always easily accessible. This unless I see excess wear in the center.
There was another thread on nitrogen not to long ago...lots of information but I'll summarize for you; not worth it.
#18
12-06-2011, 02:16 PM
Not really. On average, there's a 1 psi difference per 10 degrees. This is less aggrivated the bigger the tire.
From what you've said here, I'd be willing to wager your tire shop didn't use the nitrogen. Also, don't forget (now that you've aired your tires down) if you add air to pump them back up any, the benefits of the nitrogen are negated.
There was another thread on nitrogen not to long ago...lots of information but I'll summarize for you; not worth it.
From what you've said here, I'd be willing to wager your tire shop didn't use the nitrogen. Also, don't forget (now that you've aired your tires down) if you add air to pump them back up any, the benefits of the nitrogen are negated.
There was another thread on nitrogen not to long ago...lots of information but I'll summarize for you; not worth it.
#19
12-09-2011, 11:38 PM
To convert from absolute temperature to fahrenheit, you add 460 degrees. An example, pressure = 35 PSI at 70 degrees F, now what will it be (roughly) at 0 degrees? 35 * 460 / (460+70) = 30.3 PSI. Again, the pressure will change a little less due to the tire volume being a little larger at 35 PSI (less bulge at the ground).