High Tire Pressure!!
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Joined: Apr 2005
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From: Northern NYs Adirondack Mountains,http://www.visitsacandaga.com.
MAX means MAX, put them at 30. At that high pressure the middles will wear out real fast, and it will be a very harsh ride
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Why are you running 40 psi in the first place? Pressure should be much lower - like about 30 psi hot. And as far as I know there is no way to reset the threshhold as to when the high pressure warning comes on.
Team Owner
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From: Virginia
St. Jude Donor '11
...I say 30-31 lbs HOT is the correct pressure and that means 27-28 cold in the summer and a little more when its cold out(winter)...actually needs to be adjusted for the seasons.....ie.>>>if you put 30 cold in the summer it can reach 36+ on the highway and thats too much....
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Max pressure is just that - the maximum inflation as recommended by the tire manufacturer. It has absolutely nothing to do with the recommended tire pressures by the vehicle manufacturer.
I'll say this again - the engineers spend a lot of time analyzing data to determine the optimal inflation for the vehicle, in the interest of optimal ride, handling and treadwear.
The tire manufacturer has no idea on the application of the tire, meaning that they don't know what kind of car the tire is going to be mounted on, so they are in no position to recommend optimal inflation on the car.
But the ultimate responsibility rests with the consumer. Applying a blanket correct answer for every single application is impossible. The correct inflation for a C5 used in cold weather is different than one used in hot weather. The sticker on the door jamb states "recommended cold inflation". But 30psi cold in my tires will result in 36 - 38 psi hot, because of the high ambient temperatures in my region of the country and the resulting high temperatures of the pavement.
I adjust my inflation winter vs. summer - in the summer I run about 26psi cold, and the tires get up to about 32psi hot. In the winter I run about 29 psi cold and end up with about 32psi hot. Is that the answer for everyone here on the CF - most emphatically NO!
The summer temperatures in some parts of the country are dramatically cooler than they are in the Desert Southwest. Ever watched a NASCAR race? The crew chiefs are having the tire pressures adjusted by the team's tire guy to fit track temperatures, and desired longevity of the tire, without sacrificing too much on the handling.
So adjust your inflation to suit your needs and check it often. But inflating the tires to the maximum allowable as stated on the sidewall is not ever going to be the right answer for a C5.
I'll say this again - the engineers spend a lot of time analyzing data to determine the optimal inflation for the vehicle, in the interest of optimal ride, handling and treadwear.
The tire manufacturer has no idea on the application of the tire, meaning that they don't know what kind of car the tire is going to be mounted on, so they are in no position to recommend optimal inflation on the car.
But the ultimate responsibility rests with the consumer. Applying a blanket correct answer for every single application is impossible. The correct inflation for a C5 used in cold weather is different than one used in hot weather. The sticker on the door jamb states "recommended cold inflation". But 30psi cold in my tires will result in 36 - 38 psi hot, because of the high ambient temperatures in my region of the country and the resulting high temperatures of the pavement.
I adjust my inflation winter vs. summer - in the summer I run about 26psi cold, and the tires get up to about 32psi hot. In the winter I run about 29 psi cold and end up with about 32psi hot. Is that the answer for everyone here on the CF - most emphatically NO!
The summer temperatures in some parts of the country are dramatically cooler than they are in the Desert Southwest. Ever watched a NASCAR race? The crew chiefs are having the tire pressures adjusted by the team's tire guy to fit track temperatures, and desired longevity of the tire, without sacrificing too much on the handling.
So adjust your inflation to suit your needs and check it often. But inflating the tires to the maximum allowable as stated on the sidewall is not ever going to be the right answer for a C5.
Last edited by blacksedan87; Oct 6, 2007 at 01:07 AM.
Team Owner
Joined: May 2001
Posts: 36,836
Likes: 244
From: Dear Karma, I have a list of people you missed.
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16
Max pressure is just that - the maximum inflation as recommended by the tire manufacturer. It has absolutely nothing to do with the recommended tire pressures by the vehicle manufacturer.
I'll say this again - the engineers spend a lot of time analyzing data to determine the optimal inflation for the vehicle, in the interest of optimal ride, handling and treadwear.
The tire manufacturer has no idea on the application of the tire, meaning that they don't know what kind of car the tire is going to be mounted on, so they are in no position to recommend optimal inflation on the car.
But the ultimate responsibility rests with the consumer. Applying a blanket correct answer for every single application is impossible. The correct inflation for a C5 used in cold weather is different than one used in hot weather. The sticker on the door jamb states "recommended cold inflation". But 30psi cold in my tires will result in 36 - 38 psi hot, because of the high ambient temperatures in my region of the country and the resulting high temperatures of the pavement.
I adjust my inflation winter vs. summer - in the summer I run about 26psi cold, and the tires get up to about 32psi hot. In the winter I run about 29 psi cold and end up with about 32psi hot. Is that the answer for everyone here on the CF - most emphatically NO!
The summer temperatures in some parts of the country are dramatically cooler than they are in the Desert Southwest. Ever watched a NASCAR race? The crew chiefs are having the tire pressures adjusted by the team's tire guy to fit track temperatures, and desired longevity of the tire, without sacrificing too much on the handling.
So adjust your inflation to suit your needs and check it often. But inflating the tires to the maximum allowable as stated on the sidewall is not ever going to be the right answer for a C5.
I'll say this again - the engineers spend a lot of time analyzing data to determine the optimal inflation for the vehicle, in the interest of optimal ride, handling and treadwear.
The tire manufacturer has no idea on the application of the tire, meaning that they don't know what kind of car the tire is going to be mounted on, so they are in no position to recommend optimal inflation on the car.
But the ultimate responsibility rests with the consumer. Applying a blanket correct answer for every single application is impossible. The correct inflation for a C5 used in cold weather is different than one used in hot weather. The sticker on the door jamb states "recommended cold inflation". But 30psi cold in my tires will result in 36 - 38 psi hot, because of the high ambient temperatures in my region of the country and the resulting high temperatures of the pavement.
I adjust my inflation winter vs. summer - in the summer I run about 26psi cold, and the tires get up to about 32psi hot. In the winter I run about 29 psi cold and end up with about 32psi hot. Is that the answer for everyone here on the CF - most emphatically NO!
The summer temperatures in some parts of the country are dramatically cooler than they are in the Desert Southwest. Ever watched a NASCAR race? The crew chiefs are having the tire pressures adjusted by the team's tire guy to fit track temperatures, and desired longevity of the tire, without sacrificing too much on the handling.
So adjust your inflation to suit your needs and check it often. But inflating the tires to the maximum allowable as stated on the sidewall is not ever going to be the right answer for a C5.
Attaboy Randy! 
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Verdad Gallardo
Tech Contributor
Joined: Dec 2003
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From: Horncastle Lincolnshire, England
2023 C5 of the Year Finalist - Unmodified
Good advice from RandyI despair of so called professionals who put 40 psi in a runflat tire which already has stiff sidewalls; and on a performance car to boot. What are they thinking?
Le Mans Master
Joined: Feb 2006
Posts: 5,267
Likes: 40
From: Phoenix AZ
The wider your tires the more it will affect how much the center rises with high pressures.
With my Z06 sized Kumho MX's I run 29-30 cold on the rears and 33 cold in the fronts. Since I like to corner hard all the time, I had to run the fronts a little more.
After 8 months, the tire wear is dead even. Well except the rears will need replacing soon.:o
With my Z06 sized Kumho MX's I run 29-30 cold on the rears and 33 cold in the fronts. Since I like to corner hard all the time, I had to run the fronts a little more.
After 8 months, the tire wear is dead even. Well except the rears will need replacing soon.:o
