Tire Pressure
Thread Starter
Burning Brakes
Joined: Apr 2008
Posts: 1,190
Likes: 68
From: Woodland Hills California
Tire Pressure
My alignment guy said to run 34 psi cold pressure in the tires. I told him the manual calls for 30 psi cold. He claims that is why they wear the sides out. Any responses?
John
John
Racer
Joined: Jan 2001
Posts: 357
Likes: 2
From: San Diego ,CA, USA
I'm sick. I measure and record tire depth and keep track of it. It's a problem, I can't shake it, I'm an engineer.
I run 32 in front, 30-31 in back (cold of coarse)
My measurements show the fronts need more than 30 and 32 seems to be perfect for my alignment setup (-0.6 camber).
My guess is 34 in front would be to much for me.
32 in back is to much for mine, shows uneven wear. do what works for you.
I run 32 in front, 30-31 in back (cold of coarse)
My measurements show the fronts need more than 30 and 32 seems to be perfect for my alignment setup (-0.6 camber).
My guess is 34 in front would be to much for me.
32 in back is to much for mine, shows uneven wear. do what works for you.
Team Owner
Joined: Jun 2005
Posts: 46,295
Likes: 2,596
From: Northern, VA
St. Jude Donor '15
"In honor of jpee"
what alignment are you running that he recommends that? the 30 recommended is for the specs from the factory based on the tires, the car, the weight, etc. if you're running something different, I'd say maybe.
but as seen above, it has to do a little bit with your driving style, too. how have your tires been wearing across the tread, front and rear and tire by tire? feathering, cupping, even tread depth, etc.
but as seen above, it has to do a little bit with your driving style, too. how have your tires been wearing across the tread, front and rear and tire by tire? feathering, cupping, even tread depth, etc.
Team Owner
Joined: Oct 2004
Posts: 27,420
Likes: 64
From: San Clemente CA
30 in front works for me but not in the rear. 30 caused the center to wear faster than the edges so I lowered the rear to 28. So far it's working. I have 26,000 miles on the rears and should get another 5 or 10,000 out of them. 
Le Mans Master
Joined: Sep 2008
Posts: 8,022
Likes: 8
From: Stafford VA, home of our wolf den. No house break ins to date.
Run the O.E. pressure folks. A lot of testing went into that for a reason........ I will admit I add 2 psi to the front, but thats it. Tires wear for a reason...... that reason is they are doing their job........ if the crown edge wears, it means its grabbing in the corners..... if you over inflate.. you are not using the crown edge, henceforth, you are loosing performance from the car...... your front tires will break loose much quicker..your foot print is smaller.
In order to receive the performance you expect from a car such as a Corvette, or other high performance cars, there is a trade off.... the tire. The tire is the link to the pavement that transforms all that engineering from that auto to what it is....... and its going to wear.. if it didn't wear, then you won't receive the performance.... its like the line on your weedeater, the grip on your golf clubs, tennis racquet, the soles of your running shoes........
In order to receive the performance you expect from a car such as a Corvette, or other high performance cars, there is a trade off.... the tire. The tire is the link to the pavement that transforms all that engineering from that auto to what it is....... and its going to wear.. if it didn't wear, then you won't receive the performance.... its like the line on your weedeater, the grip on your golf clubs, tennis racquet, the soles of your running shoes........
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Thread Starter
Burning Brakes
Joined: Apr 2008
Posts: 1,190
Likes: 68
From: Woodland Hills California
Thanks for the responses. With the stock wheels, I ran 30 front and rear and got 36,000 out of all four tires. The fronts had cord showing on the inside edge when I removed to do the wide body mod. The rears probably have a few thousand left before reaching the tread wear indicators. I think I will stick with 30 all around, as that proved well with the original tires. I had the alignment done to factory stock specs.
John
John
Team Owner
Joined: Apr 2008
Posts: 31,867
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From: Middle TN by way of KY, OH, VA, IL, CA, FL, NY, SC, HI
Depends on the tires, the load, the temperature where you use them (including temp. gain under use) and the use (track, town, highway). 30 is a good cold nominal start. Going much above 30 will imporve mpg, but the difference may be eaten up in more frequent tire replacement costs. That said, low pressure is never good.
I too, am an engineer and measure my tires 2x year. I am getting over 42K miles out of my OEM GS2s rears, and the tread wear is within 1/64s across the tread.
So far they are wearing out pretty evenly across the entire tread. If I went to 34, they would be bald in the middle early.
Oh, and check that alignment.
I too, am an engineer and measure my tires 2x year. I am getting over 42K miles out of my OEM GS2s rears, and the tread wear is within 1/64s across the tread.
So far they are wearing out pretty evenly across the entire tread. If I went to 34, they would be bald in the middle early.
Oh, and check that alignment.
Instructor
Joined: Mar 2000
Posts: 134
Likes: 1
From: CA
I just upgraded my C4 to a C6 yesterday... All I can say is Wow!
The seller had just replaced the front tires with Ohtsu non runflats and pumped them up to 45 psi. Now I get an over pressure warning. 45 psi is way too high for these tires (50psi max rating). In any case, how should I determine the best psi or should I just start at 30 psi and see how it goes?
The seller had just replaced the front tires with Ohtsu non runflats and pumped them up to 45 psi. Now I get an over pressure warning. 45 psi is way too high for these tires (50psi max rating). In any case, how should I determine the best psi or should I just start at 30 psi and see how it goes?
Drifting
Joined: Jul 2009
Posts: 1,435
Likes: 19
From: Sioux Falls South Dakota
Run the O.E. pressure folks. A lot of testing went into that for a reason........ I will admit I add 2 psi to the front, but thats it. Tires wear for a reason...... that reason is they are doing their job........ if the crown edge wears, it means its grabbing in the corners..... if you over inflate.. you are not using the crown edge, henceforth, you are loosing performance from the car...... your front tires will break loose much quicker..your foot print is smaller.
In order to receive the performance you expect from a car such as a Corvette, or other high performance cars, there is a trade off.... the tire. The tire is the link to the pavement that transforms all that engineering from that auto to what it is....... and its going to wear.. if it didn't wear, then you won't receive the performance.... its like the line on your weedeater, the grip on your golf clubs, tennis racquet, the soles of your running shoes........
In order to receive the performance you expect from a car such as a Corvette, or other high performance cars, there is a trade off.... the tire. The tire is the link to the pavement that transforms all that engineering from that auto to what it is....... and its going to wear.. if it didn't wear, then you won't receive the performance.... its like the line on your weedeater, the grip on your golf clubs, tennis racquet, the soles of your running shoes........
Retired & lovin' it!
Joined: Mar 2005
Posts: 4,475
Likes: 549
From: Jackson NJ
Alignment I'm running is Front 7.85 degrees Caster; negative 0.45 degrees Camber; 0.02" Toe.... Rear negative 0.48 degrees Camber; 0.00" Toe. With this set up & Nitto Invo's, I'm running 32 lbs (cold) all around. Get great steering response, especially on turn-in & excellent tire wear.
Drifting
Joined: Sep 2009
Posts: 1,381
Likes: 1
From: Forestville CA
Run the O.E. pressure folks. A lot of testing went into that for a reason........ I will admit I add 2 psi to the front, but thats it. Tires wear for a reason...... that reason is they are doing their job........ if the crown edge wears, it means its grabbing in the corners..... if you over inflate.. you are not using the crown edge, henceforth, you are loosing performance from the car...... your front tires will break loose much quicker..your foot print is smaller.
In order to receive the performance you expect from a car such as a Corvette, or other high performance cars, there is a trade off.... the tire. The tire is the link to the pavement that transforms all that engineering from that auto to what it is....... and its going to wear.. if it didn't wear, then you won't receive the performance.... its like the line on your weedeater, the grip on your golf clubs, tennis racquet, the soles of your running shoes........
In order to receive the performance you expect from a car such as a Corvette, or other high performance cars, there is a trade off.... the tire. The tire is the link to the pavement that transforms all that engineering from that auto to what it is....... and its going to wear.. if it didn't wear, then you won't receive the performance.... its like the line on your weedeater, the grip on your golf clubs, tennis racquet, the soles of your running shoes........
Sage advice. Why do we think we can outsmart people who spent so much time and money to come up with a DOT approved rating and rec pressure? I think it is the "tinkerer" in all of us gearheads. It has taken me a long time to quit "F'ng" around with it and stick with stock. Now, if I were going to start tracking my car.......
Team Owner
Joined: Mar 2008
Posts: 21,502
Likes: 465
From: Southern Utah
I just upgraded my C4 to a C6 yesterday... All I can say is Wow!
The seller had just replaced the front tires with Ohtsu non runflats and pumped them up to 45 psi. Now I get an over pressure warning. 45 psi is way too high for these tires (50psi max rating). In any case, how should I determine the best psi or should I just start at 30 psi and see how it goes?
The seller had just replaced the front tires with Ohtsu non runflats and pumped them up to 45 psi. Now I get an over pressure warning. 45 psi is way too high for these tires (50psi max rating). In any case, how should I determine the best psi or should I just start at 30 psi and see how it goes?
Instructor
Joined: Mar 2000
Posts: 134
Likes: 1
From: CA
Le Mans Master
Joined: Sep 2008
Posts: 8,022
Likes: 8
From: Stafford VA, home of our wolf den. No house break ins to date.
