42 psi, Goodyear OEM Tires

3963 Views 16 Replies 13 Participants Last post by imanjunk1963, Jul 9, 2017

Rickoshay

Discussion Starter · Jul 8, 2017

I run 42 psi in the Goodyear OEM tires. Gauged when cold. It is so hot in this area, ambient temps 108/111 degrees fahrenheit, that the DIC tells me the pressures are 46/49 psi after 10 miles of 65 mph freeway driving. When cold the DIC reading is fairly accurate when checked against an electronic pressure gauge.
What pressure would you run in these conditions when checked with the tires at 72 degrees?

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jcramer

· #2 · Jul 8, 2017

The maximum pressure for the Goodyear OEM tires is 51 psi, so you are not exceeding that. However, the DIC units on my Volt read about 1.5 psi lower than the gauge pressure, so you may be pushing it. If it were me, I'd probably reduce the DIC-indicated pressure to about 44 psi.

I read somewhere that filling the tires with pure nitrogen, as they do at Costco, reduces the pressure variation with temperature because water vapor, which has a larger expansion coefficient, is excluded.

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jcramer

· #11 · Jul 8, 2017 (Edited)

hpleog: Have a look at http://www.popularmechanics.com/cars/how-to/a3894/4302788/ .

This Popular Mechanics article says that (a) nitrogen diffuses through rubber more slowly than does oxygen and (b) it suppresses moisture that leads to big pressure variations with temperature. These are both good things to have.

The video you referenced seems to assume that if you get your tires filled with nitrogen, you must never put in your own air and you have to keep coming back for more. It also seems to assume that if you put in nitrogen, you never do a pressure check. That isn't at all how I would do it. Adding a psi or so of ambient air to a 42 psi tire will not change the gas inside much, so I'd feel free to do so. All Volt owners have their own air pump.

That being said, I don't think I would pay for a nitrogen fill, but if Costco or some other place does it for free, I'd certainly go for it.

This brings up an interesting idea, though. Why not have an in-line chemical dryer that connects between the air pump and the tire, so that one can reduce the moisture inside the tires? I see that one can buy an in-line dessicant dryer that goes up to 60 psi for $4.59 on eBay.

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