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Author Topic: What tire pressure?  (Read 14136 times, 15 Replies)
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Blackstallion
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« on: September 18, 2011, 09:34:16 AM »

My 2011 Acadia came from the dealer with 35 psi in the tires, however the tires say max pressure 44 psi (OEM Goodyear RS-A's). Any reason behind 35 psi, seems a bit low.

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« Reply #1 on: September 18, 2011, 10:31:14 AM »

44 is merely the max pressure. Go with roughly what the manufacturer recommends which is probably 35+/-  I keep mine around 38 or so warm.
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« Reply #2 on: September 18, 2011, 10:43:33 AM »

44 is merely the max pressure. Go with roughly what the manufacturer recommends which is probably 35+/-  I keep mine around 38 or so warm.

Agreed


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« Reply #3 on: September 18, 2011, 01:53:24 PM »

My 2011 Acadia came from the dealer with 35 psi in the tires, however the tires say max pressure 44 psi (OEM Goodyear RS-A's). Any reason behind 35 psi, seems a bit low.

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The sticker on the driver's door panel gives the mfg recommended pressure which is probably the 35 psi.

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« Reply #4 on: September 18, 2011, 05:15:58 PM »

Exactly the placard on the driver side door says 35 psi cold pressure and when they reach optimal temp after driving it is more like 37 or so.  The reason you go based on the manufacturer recommendations is that it is the "true, tried and tested" pressure by which they determine optimal ride comfort, MPG and other "test driven" reasons.  I have nitrogen filled tires, straight from the dealer, and with the cold weather creeping in Chicago I have started to notice that the pressure in the tires has started to drop but not drastically.  I really don't think there is much difference between "air" and nitrogen filled tires now that I have experience with them.  Today, I just filled them with a bit of "regular" air since the dealer is not open on Sundays and they were all around 32-33 psi.  I also keep my tire pressure at about +2 psi (cold) above the recommended during the fall and winter season as it prevents me from losing significant pressure due to the huge temperature fluctuations.
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« Reply #5 on: September 18, 2011, 06:03:44 PM »

So much for nitrogen. Mr free air filled tires have only dropped about 3 psi after the significant temp decline in the NE last few days. I think they say 1lb for every 10 degree change.
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« Reply #6 on: September 19, 2011, 03:15:33 AM »

The large pressure fluctuations with changing tire temperatures have more to do with moisture in the air, as opposed to percentage of oxygen vs nitrogen.
Nitrogen delivery systems, by design, are highly processed so there is little if any moisture in it at all, while almost all compressed air systems except for refrigeration dried systems will have water in it.
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« Reply #7 on: September 19, 2011, 09:02:48 AM »

I am a 38-40 psi, cold, for years.  Always got even tire wear....etc.  Good gas mileage, but a little tougher/rougher ride.   Winter time, better bite in snow with more opening in tread for grabbing.    I check the tires first week of the month and let it go until the next month using Milton's manual metal slide gauge.   Some things never change over the years.   wink
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« Reply #8 on: September 19, 2011, 09:24:47 AM »

I am a 38-40 psi, cold, for years.  Always got even tire wear....etc.  Good gas mileage, but a little tougher/rougher ride.   Winter time, better bite in snow with more opening in tread for grabbing.    I check the tires first week of the month and let it go until the next month using Milton's manual metal slide gauge.   Some things never change over the years.   wink
I like your approach as well.  I got decent life out of the Forteras keeping them close to 40psi year round.  Doing the same now with the Toyos.
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« Reply #9 on: September 19, 2011, 12:39:31 PM »

I always adjust my COLD tire pressure (pressure measured in the AM- when its the coldest) and set them to 35.
I especially do this when the seasons change.
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« Reply #10 on: September 19, 2011, 02:42:07 PM »

I always adjust my COLD tire pressure (pressure measured in the AM- when its the coldest) and set them to 35.
I especially do this when the seasons change.

Presume they increase a bit as you drive and the tires heat up.
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« Reply #11 on: September 19, 2011, 03:22:59 PM »

yes- set them to 35 in the cold- so they remain at 35 every morning as long as temps remain at that 'cold' temp.
Once driven- the PSI will go up. But regardless during the night- they will hit 35 once cold.

Now if you live in super cold where its 20 one night- and -10 a few days later--- youll have to adjust your pressure accordingly to your cold temps.
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« Reply #12 on: September 19, 2011, 03:41:31 PM »

yes- set them to 35 in the cold- so they remain at 35 every morning as long as temps remain at that 'cold' temp.
Once driven- the PSI will go up. But regardless during the night- they will hit 35 once cold.

Now if you live in super cold where its 20 one night- and -10 a few days later--- youll have to adjust your pressure accordingly to your cold temps.
Can't wait for winter -hope it's not as bad as last year.  Of course, you have nothing to worry about in that regard.
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« Reply #13 on: September 19, 2011, 04:52:21 PM »

youre right-- our coldest temp we may see is about 32. but mostly in the 35-45s for winter.
lucky for us.
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« Reply #14 on: September 19, 2011, 07:08:34 PM »

youre right-- our coldest temp we may see is about 32. but mostly in the 35-45s for winter.
lucky for us.
32 was a heat wave in NE last winter.
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« Reply #15 on: September 19, 2011, 07:14:10 PM »

I haven't actually tried checking the temp. on my tires last winter which went from -20deg. C to the coldest of -40deg. C which is really a pain when doing it. I will definitely give this a try this coming winter just to see if it really does fluctuates.
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