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Discussion Starter #1
What numbers do you feel are optimal (regardless of factory setting)??

35psi all around?
36psi all around?
higher/lower?
 

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17 XTS Platinum V-Sport; 17 Buick Envision AWD Turbo; 10 Lincoln MKS AWD Twin Turbo
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I used to run 32/34 F/R.
 

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17 XTS Platinum V-Sport; 17 Buick Envision AWD Turbo; 10 Lincoln MKS AWD Twin Turbo
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Interesting. I am pretty sure the factory specs for my 18's were higher pressure rear, lower pressure front.
 

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Cadillac Eldorado ETC Collector Series
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31 Posts
32 all around..manufacturer says 30... unless driving at sustained speeds over 100, it said 35psi
 

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91 Allante (gone), 06 SRX (gone)
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I shoot for 33 all-around when cold. I notice that these tires (17" factory) are more sensitive to temperature / pressure changes than others.
 

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'04 SRX
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32 PSI cold on 17" Continentals. Picks up to about 38 PSI after a 1/2 hour in FL highway driving. I like the higher pressure for gas miles... and the Continentals are designed for it. I tend to run 1-2 PSI higher in the rear tires... just the feel I like.
 

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I go with the factory spec 32/30 filled with Nitrogen. From what I understand, the nitrogen won't expand when hot, so my PSI is always the same.
 

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I go with the factory spec 32/30 filled with Nitrogen. From what I understand, the nitrogen won't expand when hot, so my PSI is always the same.
What did it cost and who did it for you! Any other benefits(better ride, better mileage, cooler running, any variance between cold and hot pressure)?
 

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I have a buddy who works for a fire protection company and they use the nitrogen to purge the water systems in buildings, so he has big bottles of the stuff. So it was free.

As far as benefits go, I think the ride and wear on the tire are the greatest. When you drive the car and the tires get warm, the air expands and thus "over-inflates" your tires and makes the tread wear towards the middle and not along the sides. With nitrogen the air pressure is always the same since it doesn't expand, and the car is getting the most traction out of the tire.

Most tire shops now are putting in nitrogen into new tires, because of these benefits.
 

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Just put on 4 new Goodyear tires. The shop set them at 30f 32r. Everything worked great. Then I asked my buddy the dentist to fill them with nitrious oxide which he did. Now it rides funny.
 
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