Tire Pressure - Pontiac GTO Forum
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post #1 of 16 (permalink) Old 08-17-2011, 09:43 PM Thread Starter
 
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Tire Pressure

what are you guys running? For the Front oem tires, 235 18 40, and Rear 285 35 18?

what's the best psi for fuel economy, and then what would be the preferable psi for the traction/time?
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post #2 of 16 (permalink) Old 08-18-2011, 07:39 AM
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I run 35# with 245/45/17 & 285/40/17 all around. The firmer you run them the less rolling resistance. You just don't want to run them so high they wear just in the center or blow up . When I ran street tires at the track I ran 40# in the front and 25# in the rear.

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post #3 of 16 (permalink) Old 08-19-2011, 11:34 AM
 
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51 front 46 rear. No, it doesn't wear out the center patch, at least not on mine. I run max in the front to combat the slight camber wear, but mainly to keep wear even from hard cornering. A little less in the rear because there isn't as much weight back there. Same thing for both cars.

For grip I'd go almost all the way down to 20.
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post #4 of 16 (permalink) Old 08-19-2011, 11:49 AM
 
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51 front 46 rear. No, it doesn't wear out the center patch, at least not on mine. I run max in the front to combat the slight camber wear, but mainly to keep wear even from hard cornering. A little less in the rear because there isn't as much weight back there. Same thing for both cars.

For grip I'd go almost all the way down to 20.
I am supprised the middles don't wear on yours. Mine were at 42# when i bought the car and the center was wearing pretty noticably. But if it works for you more power to ya. Better gas milage. But i run mine usually around 34# and yeah 20# - 25# for grip.
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post #5 of 16 (permalink) Old 08-19-2011, 03:43 PM
 
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I run 32 on the street. The 265/35/18's on all four grip like crazy through the turns at that pressure. At the track 40 front 25 rear. I can see how anything below 25 on a radial tire can be beneficial in anyway.

<-- Guess which ones quicker?.....Nope! Not even close.
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post #6 of 16 (permalink) Old 09-07-2011, 10:38 AM Thread Starter
 
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for the fuel economy now that is getting colder, i run them at 35 in front and about 36.5 in the back
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post #7 of 16 (permalink) Old 09-07-2011, 11:27 AM
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I run the max listed on the side of the tires, also I fill all my customers tires to the max listed on their tires.
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post #8 of 16 (permalink) Old 09-07-2011, 12:07 PM
 
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I've always been curious: Let's say you have two vehicles, one that weighs 2700 lbs. and one that weighs 3500 lbs. but they both run the same size tire. Wouldn't they require different tire pressures based on their weight?

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post #9 of 16 (permalink) Old 09-07-2011, 12:31 PM
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I've always been curious: Let's say you have two vehicles, one that weighs 2700 lbs. and one that weighs 3500 lbs. but they both run the same size tire. Wouldn't they require different tire pressures based on their weight?
There are many different views on this. Some say to only use the tire clad in the door jam, but unless you replace the tires with the exact same brand and part # it's not going to be right, IMO.
I feel by filling to the max pressure listed on the tire`s sidewall that the tire itself will last the longest, give the best gas millage, and be able to handle the weight of the car. Remember, it's not the curb weight you need to concern yourself with, but at what weight the tire is handling say in an extreme cornering and braking condition. This is just my opinion~ and in 21+ years of service, have never had a tire issue by running the pressure listed on each tire.
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post #10 of 16 (permalink) Old 09-07-2011, 12:51 PM
 
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Fair enough. I have heard a few differing viewpoints on this from people that I would consider to be equally as credible.

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