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Tire PSI?

Xcfool

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My dealer installed accessories included Nitrogen filled tires @ 30psi for all four.
I was out of town for a week and the car wasn't driven. Now they've dropped to 28 which triggered the TPMS sensor.
Looking at the manual shows the 18" ContiPros should be 35 front, 33 rear. Which has me wondering why the dealer had them at 30.
What are ya'll running the PSI at on the stock 18's?
 
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Integra23

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I'm running 38 in fronts and 36 in rear.
 

RB2490

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Mine are at 34/33 cold. When they heat it up I see 38/37
 
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Xcfool

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Thx guys.
I was annoyed I had to get nitrogen to begin with and now pissed off they only put 30 psi.
Mad at myself that I didn't check the inflation specs from day one!
I could just add straight air myself instead of the hassle of driving 30 miles to the dealer for nitrogen.
 

RB2490

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Thx guys.
I was annoyed I had to get nitrogen to begin with and now pissed off they only put 30 psi.
Mad at myself that I didn't check the inflation specs from day one!
I could just add straight air myself instead of the hassle of driving 30 miles to the dealer for nitrogen.
They just do that to make a little extra money. It's super annoying. They tried that with me when I got my Nissan Juke and I said I'm walking. And then they chased in the parking lot to say okay they won't do the nitrogen
 
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Xcfool

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Yeah I normally would have fought them on the expensive ProPkg but at least it had a few decent accessories and they weren't marking up the MSRP.

A friend just told me all Costco have free Nitrogen inflation machines in their parking lot. I must have been living under a rock.
 

Integra23

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Yeah I normally would have fought them on the expensive ProPkg but at least it had a few decent accessories and they weren't marking up the MSRP.

A friend just told me all Costco have free Nitrogen inflation machines in their parking lot. I must have been living under a rock.
I didn't know that..
Also air contains 78% nitrogen...
 

solman

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I was out of town for a week and the car wasn't driven. Now they've dropped to 28 which triggered the TPMS sensor.
I thought the purpose of nitrogen filled tires is that the pressure does not change with temperature variations. Your tires started out low psi and dropped after sitting makes me wonder what it's all about.
 

Integra23

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I thought the purpose of nitrogen filled tires is that the pressure does not change with temperature variations. Your tires started out low psi and dropped after sitting makes me wonder what it's all about.
That's the idea but are they really filling it with 100% nitrogen? What about installing the tire? Unless it's installed in a vacuum or ambient air is evacuated you still have normal air in it. Lots of marketing.
 
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Xcfool

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Up to 95% nitrogen and I too originally assumed it was for less PSI fluctuation with temperature changes but I've since read something to the affect that Nitro molecules are larger therefore seep out more slowly through the tires pores than straight atmospheric air. Seems plausible but...
 
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