Tires
E-Ray, 3LZ, ZER, LIFT
Joined: Sep 2007
Posts: 34,939
Likes: 12,351
From: NE South Carolina
and if you forget and don't have the manual when ready to adjust it's also on a sticker on the drivers door panel as it is in most cars!Just be sure the tires are a room temp or called cold. The pressure increases to 32 to 33 psi after driving a short while in normal driving.
Le Mans Master
Joined: Sep 2003
Posts: 8,847
Likes: 795
From: Longview Texas
Believe it or not, there was a news story reporting that an unusual number of people have had tire failures due to the record heat.
It might be worth noting what the temperature (and pressure) swings are for extreme conditions... so max. tire pressures are not exceeded.
It might be worth noting what the temperature (and pressure) swings are for extreme conditions... so max. tire pressures are not exceeded.
E-Ray, 3LZ, ZER, LIFT
Joined: Sep 2007
Posts: 34,939
Likes: 12,351
From: NE South Carolina
Believe it or not, there was a news story reporting that an unusual number of people have had tire failures due to the record heat.
It might be worth noting what the temperature (and pressure) swings are for extreme conditions... so max. tire pressures are not exceeded.
It might be worth noting what the temperature (and pressure) swings are for extreme conditions... so max. tire pressures are not exceeded.
Safety Car
Joined: Jan 2015
Posts: 3,941
Likes: 499
From: Northern Virginia
Check the tire
inflation pressure when the tires
are cold, meaning the vehicle
has not been driven for at least
three hours or no more than
1.6 km (1 mi).
inflation pressure when the tires
are cold, meaning the vehicle
has not been driven for at least
three hours or no more than
1.6 km (1 mi).
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Safety Car
Joined: Jan 2015
Posts: 3,941
Likes: 499
From: Northern Virginia
Team Owner
Joined: Jun 2005
Posts: 46,295
Likes: 2,596
From: Northern, VA
St. Jude Donor '15
"In honor of jpee"
I think it depends on where you live and the climate at the time. Yes, to 30 lbs. cold, but just driving around the block can raise pressure by a pound sometimes. Don't forget that about every 10 degree swing in outside temp will change your tire pressure about 1 lb., up or down. That means, depending on where OP lives, you could have 30 lbs. cold one month and be under or over in a couple more. Keep an eye on your tire pressures. 
Melting Slicks
Joined: Sep 2013
Posts: 2,299
Likes: 466
From: Long Island New York
I can't be bothered constantly adjusting tire pressures, so mine are set to 30 psi at 70 degrees - which is what my climate controlled garage is usually at. I will deal with the tires being 32 psi on an 90 degree summer afternoon and 28 psi when it is 50 degrees out in the spring and fall.
Team Owner
Joined: Apr 2013
Posts: 26,227
Likes: 4,353
From: Chirper Island
At first, you should use both so you can see how accurate your DIC is reading. Once you know it's reading accurately , you can rely on the DIC for tire pressure when driving, BUT you should always use a hand-held when adding air, or releasing, because the DIC will NOT be accurate when the car is not moving--it doesn't sample the tire pressure often enough to give you an accurate moment to stop adding or releasing air.
, you can rely on the DIC for tire pressure when driving, BUT you should always use a hand-held when adding air, or releasing, because the DIC will NOT be accurate when the car is not moving--it doesn't sample the tire pressure often enough to give you an accurate moment to stop adding or releasing air.
Last edited by owc6; Jul 23, 2015 at 11:04 AM.
Burning Brakes
Joined: Jan 2004
Posts: 1,009
Likes: 54
From: slower lower DE
Seems to me this is being made way too complicated. Maintain air pressure per the manufacturer's instruction. Over and under inflation affects tread wear and tire performance. Check the max pressure on the tire side wall. You will not get there in normal driving. Your tires will not explode. With all due respect, the suggestions on what pressure to run (other than the manufacturer's spec) are not based on any measured testing under controlled conditions (as GM and Michelin would do).
Racer
Joined: Oct 2014
Posts: 450
Likes: 122
From: Mount Airy MD
When I did the Museum delivery in late February, the weather was pretty darn cold. Tires were at 30 psi all around. I've checked a few times since with a quality tire gauge (cold, of course), at various ambient temps. All four still read 30 psi to date, a bit of a surprise to me, (but I like it).
If one were to plan a road trip of approximately 800 miles, is it prudent to slightly elevate the psi to, say, 33-34 psi before starting the trip? The issue here is flex, which builds heat a bit more than a tire that flexes less. Would the higher starting psi result in less heat buildup?
Similar question: Would the amount of the rise in psi be more, less, or the same if starting at 30 psi on the road trip, compared to starting at 34 psi?
Counting on the collective wisdom of Forum members to help me sort this one out. Thanks, in advance.
If one were to plan a road trip of approximately 800 miles, is it prudent to slightly elevate the psi to, say, 33-34 psi before starting the trip? The issue here is flex, which builds heat a bit more than a tire that flexes less. Would the higher starting psi result in less heat buildup?
Similar question: Would the amount of the rise in psi be more, less, or the same if starting at 30 psi on the road trip, compared to starting at 34 psi?
Counting on the collective wisdom of Forum members to help me sort this one out. Thanks, in advance.
Drifting
Joined: Sep 2012
Posts: 1,443
Likes: 116
From: No Longer in CA! NV
Seems to me this is being made way too complicated. Maintain air pressure per the manufacturer's instruction. Over and under inflation affects tread wear and tire performance. Check the max pressure on the tire side wall. You will not get there in normal driving. Your tires will not explode. With all due respect, the suggestions on what pressure to run (other than the manufacturer's spec) are not based on any measured testing under controlled conditions (as GM and Michelin would do).
^^^THIS^^^ Best to follow manufacturer's instructions for street and track use.