Proper tire pressure
Team Owner
Joined: Oct 2004
Posts: 27,420
Likes: 64
From: San Clemente CA
I have run 30 front and rear for 8500 miles. I am very easy on the car, no burn outs and the rear tires have worn 1/32 more in the centers. I have changed the rear pressure to 28 and see if that helps. There is a disagreement on this forum about the pressure for this condition. Some say with run-flats you should increase the pressure for this condition and others say decrease it. I will see what happens. I am hoping for 25 to 30,000 from these tires.
Last edited by VET4LES; Jun 5, 2006 at 07:41 AM.
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Thread Starter
Instructor
Joined: Apr 2006
Posts: 178
Likes: 0
From: Rochester New York
Originally Posted by VET4LES
I have run 30 front and rear for 8500 miles. I am very easy on the car, not burn outs and the rear tires have worn 1/32 more in the centers. I have changed the rear pressure to 28 and see if that helps. There is a disagreement on this forum about the pressure for this condition. Some say with run-flats you should increase the pressure for this condition and others say decrease it. I will see what happens. I am hoping for 25 to 30,000 from these tires.
I guess If I go with 29/30 I should be ok.
Don't expect that many miles on those tires... I just hit 12,000 and it's time for new ones.
Although, I do drive it a little hard at times.
Instructor
Joined: Apr 2006
Posts: 206
Likes: 0
Originally Posted by GooseyGoose
Getting my new Supercar tires installed this week.
What is the best tire pressure to run for street use?
I drive it pretty hard at times.
Thanks
What is the best tire pressure to run for street use?
I drive it pretty hard at times.
Thanks
Le Mans Master
Joined: Aug 2000
Posts: 5,529
Likes: 1,943
From: Austin Texas
//pendanic mode = on
The right tire pressure is between 38-40 PSI HOT. So after you get the new tires fitted, start with 32 PSI in them, go out and find that raod where you can drive the snot out of the car SAFELY for at least 10 minutes. Then get out and measure the HOT pressures and write these down. Then take the car home and let it sit overnight and measure the pressures in the morning. This is the pressure you should use when you are going to run the snot out of the car (safely).
//pendanic mode = off
At other times you should set the pressure in the 30-32 PSI range. 30 PSI for gentle cruising, 32 PSI for faster steering response at the cost of some ride quality.
The right tire pressure is between 38-40 PSI HOT. So after you get the new tires fitted, start with 32 PSI in them, go out and find that raod where you can drive the snot out of the car SAFELY for at least 10 minutes. Then get out and measure the HOT pressures and write these down. Then take the car home and let it sit overnight and measure the pressures in the morning. This is the pressure you should use when you are going to run the snot out of the car (safely).
//pendanic mode = off
At other times you should set the pressure in the 30-32 PSI range. 30 PSI for gentle cruising, 32 PSI for faster steering response at the cost of some ride quality.
Team Owner
Joined: Dec 2002
Posts: 32,074
Likes: 296
From: San Francisco CA
Originally Posted by MitchAlsup
//pendanic mode = on
The right tire pressure is between 38-40 PSI HOT. So after you get the new tires fitted, start with 32 PSI in them, go out and find that raod where you can drive the snot out of the car SAFELY for at least 10 minutes. Then get out and measure the HOT pressures and write these down. Then take the car home and let it sit overnight and measure the pressures in the morning. This is the pressure you should use when you are going to run the snot out of the car (safely).
//pendanic mode = off
At other times you should set the pressure in the 30-32 PSI range. 30 PSI for gentle cruising, 32 PSI for faster steering response at the cost of some ride quality.
The right tire pressure is between 38-40 PSI HOT. So after you get the new tires fitted, start with 32 PSI in them, go out and find that raod where you can drive the snot out of the car SAFELY for at least 10 minutes. Then get out and measure the HOT pressures and write these down. Then take the car home and let it sit overnight and measure the pressures in the morning. This is the pressure you should use when you are going to run the snot out of the car (safely).
//pendanic mode = off
At other times you should set the pressure in the 30-32 PSI range. 30 PSI for gentle cruising, 32 PSI for faster steering response at the cost of some ride quality.
Burning Brakes
Joined: Aug 2000
Posts: 887
Likes: 10
From: Ontario New York
Originally Posted by MitchAlsup
//pendanic mode = on
The right tire pressure is between 38-40 PSI HOT. So after you get the new tires fitted, start with 32 PSI in them, go out and find that raod where you can drive the snot out of the car SAFELY for at least 10 minutes. Then get out and measure the HOT pressures and write these down. Then take the car home and let it sit overnight and measure the pressures in the morning. This is the pressure you should use when you are going to run the snot out of the car (safely).
//pendanic mode = off
At other times you should set the pressure in the 30-32 PSI range. 30 PSI for gentle cruising, 32 PSI for faster steering response at the cost of some ride quality.
The right tire pressure is between 38-40 PSI HOT. So after you get the new tires fitted, start with 32 PSI in them, go out and find that raod where you can drive the snot out of the car SAFELY for at least 10 minutes. Then get out and measure the HOT pressures and write these down. Then take the car home and let it sit overnight and measure the pressures in the morning. This is the pressure you should use when you are going to run the snot out of the car (safely).
//pendanic mode = off
At other times you should set the pressure in the 30-32 PSI range. 30 PSI for gentle cruising, 32 PSI for faster steering response at the cost of some ride quality.
28 to 29 psig cold will end up being 30 to 31 psig on the road on a 80 F day with air. Nitrogen is best at 30 psig.
Le Mans Master
Joined: Nov 2004
Posts: 6,566
Likes: 2
From: Goleta CA
Cruise-In VIII Veteran
Originally Posted by C6RAPTOR
We found out at the Putnam Park NCM HPDE that the Supercar tires do not perform well at 38 psig. One of the GM engineers that was at the event told me that at 38 psig you will damage the center of the tire.
28 to 29 psig cold will end up being 30 to 31 psig on the road on a 80 F day with air. Nitrogen is best at 30 psig.
28 to 29 psig cold will end up being 30 to 31 psig on the road on a 80 F day with air. Nitrogen is best at 30 psig.
I learned that the hard way
Drifting
Joined: Nov 2005
Posts: 1,322
Likes: 3
From: Hugetown Texas
St. Jude Donor '06-'07
Originally Posted by MitchAlsup
//pendanic mode = on
The right tire pressure is between 38-40 PSI HOT. So after you get the new tires fitted, start with 32 PSI in them, go out and find that raod where you can drive the snot out of the car SAFELY for at least 10 minutes. Then get out and measure the HOT pressures and write these down. Then take the car home and let it sit overnight and measure the pressures in the morning. This is the pressure you should use when you are going to run the snot out of the car (safely).
//pendanic mode = off
At other times you should set the pressure in the 30-32 PSI range. 30 PSI for gentle cruising, 32 PSI for faster steering response at the cost of some ride quality.
The right tire pressure is between 38-40 PSI HOT. So after you get the new tires fitted, start with 32 PSI in them, go out and find that raod where you can drive the snot out of the car SAFELY for at least 10 minutes. Then get out and measure the HOT pressures and write these down. Then take the car home and let it sit overnight and measure the pressures in the morning. This is the pressure you should use when you are going to run the snot out of the car (safely).
//pendanic mode = off
At other times you should set the pressure in the 30-32 PSI range. 30 PSI for gentle cruising, 32 PSI for faster steering response at the cost of some ride quality.
Le Mans Master
Joined: Nov 1999
Posts: 7,695
Likes: 51
From: Imperial Beach CA
Originally Posted by VET4LES
I have run 30 front and rear for 8500 miles. I am very easy on the car, no burn outs and the rear tires have worn 1/32 more in the centers. I have changed the rear pressure to 28 and see if that helps. There is a disagreement on this forum about the pressure for this condition. Some say with run-flats you should increase the pressure for this condition and others say decrease it. I will see what happens. I am hoping for 25 to 30,000 from these tires.