Tire Pressures
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kurtatx (09-12-2018)
09-12-2018, 01:59 PM
#3
People have noted that their tires come overinflated when they first purchased the car, that might be the case of your vehicle.
09-12-2018, 02:01 PM
#4
Burning Brakes
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justnspace (09-12-2018)
01-11-2019, 08:04 AM
#7
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My PSI was set at 36 front and rear and I wasn't real happy with the feel of my RDX. It wasn't bad but it felt more like a sports car rather than a soft ride. The dealer suggested lowering the PSI to 34 and so far I see a huge improvement.
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02-23-2019, 02:50 PM
#8
Our ASpec tires showed 39 psi (cold) when we picked up from the dealer. Ambient temp 55 degrees outside. Definitely hard ride! I will lower pressure for sure...especially because summer asphalt temperatures here in Tucson frequently can be 150 degrees! I will do nitrogen fill soon. I did this in last car. Has anyone used nitrogen in their RDX?
02-23-2019, 03:24 PM
#9
Our ASpec tires showed 39 psi (cold) when we picked up from the dealer. Ambient temp 55 degrees outside. Definitely hard ride! I will lower pressure for sure...especially because summer asphalt temperatures here in Tucson frequently can be 150 degrees! I will do nitrogen fill soon. I did this in last car. Has anyone used nitrogen in their RDX?
I bought mine in Tucson also, and they have green caps, and were filled to 40 lbs. which seems highly unlikely if they are filled with nitrogen....especially considering the high number of owners who have reported them being at 39-40 lbs on delivery.
02-23-2019, 03:38 PM
#10
Yup...had green caps....which I have already changed. Since we have this cold spell, I will see if pressure has dropped. If not, I will assume a nitrogen fill. Once I lower ... say to 35 lbs, I will just have to keep an eye on the pressures. Thanks for the tip about the green caps!
02-23-2019, 04:17 PM
#11
Burning Brakes
Nitrogen is a gas and is still affected by changes in ambient temperature (about one psi for every 10° Fahrenheit). Nitrogen filled tires will require pressure be added during the fall/winter months as ambient temperatures and tire pressures drop. Nitrogen is good but can't change the laws of physics.
02-23-2019, 06:31 PM
#13
Burning Brakes
My aspec was at 40 today after it warmed up and the driving was definitely rougher and firmer, I brought it down to 36 and the ride was great then in my aspec
01-13-2020, 12:06 AM
#14
Not a valid gauge at all since nitrogen will expand/contract with temperature.
From: https://m.tirerack.com/tires/tiretec...jsp?techid=191
From: https://m.tirerack.com/tires/tiretec...jsp?techid=191
However, this benefit is negligible or tiny when weighed in the real world. My opinion is that if someone offers you nitrogen of course take it. But don’t go out of your way to get it. Also, no one has mentioned the idea “why” hot tires increase in pressures.... => normal compressed air causes condensed gas water vapors to solidify into water in the bottom of storage tanks which gets into your tires. This creates heat and friction and expansion later when the water heats back into gas and expands as the tires performs. Not an issue with nitrogen.
Cooler running temperatures: When air is pressurized, the humidity in it condenses to a liquid and collects in the air storage tank you use at the local gas station. When you add compressed air to the tire, the water comes along for the ride. As the tire heats up during driving, that water changes to a gas, which then expands, increasing tire pressure. Because nitrogen is dry, there is no water vapor in the tire to contribute to pressure fluctuations.
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