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Old 09-05-2010, 09:11 AM   #1
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Tire Pressure Questions

Good Morning:

I have the OEM 20's and had a couple questions about the tire pressure/TPMS.

1. When I got the car the tire pressure was showing uniformly in the range of 32-35 psi but I wanted to know what the recommended tire pressure was from everyone and what it was from the manufacturer?

2. It seems like I will add air to the tires to the tune of 35 or so PSI and not too much time will pass and I'll get a warning that the tires are down to 31 or 32 and this is pretty uniform (not a trouble tire for example). Anyone else see the air drop kind of quickly?
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Old 09-05-2010, 09:22 AM   #2
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Its says in the drivers door 36 psi cold. I set mine at approx 38 cold. 32 is too low
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Old 09-05-2010, 09:35 AM   #3
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I set mine to about 40, in a couple of weeks it is at 36-37. Just easier for me to not have to add air every month.
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Old 09-05-2010, 11:17 AM   #4
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My TPMS seems to under report. My gauge says 38-40 but the sensors report 35 -37 I don't which is wrong. I need to try another gauge I guess.
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Old 09-05-2010, 11:37 AM   #5
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Quote:
Originally Posted by gr8daneh View Post
My TPMS seems to under report. My gauge says 38-40 but the sensors report 35 -37 I don't which is wrong. I need to try another gauge I guess.
Trust the gauge over the TPMS, or you'll be putting air in every week.
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Old 09-05-2010, 11:44 AM   #6
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Trust the gauge over the TPMS, or you'll be putting air in every week.
very true here. depending on temp change outside, expect to have to let air out when its warmer and add air when its cooler. my tire pressure stays pretty constant - i check it about 2x's a month. 36 psi is recommended, lower than that, decreased gas mileage, above that, may tire may wear unevenly.
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Old 09-07-2010, 08:40 PM   #7
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mine has dropped lately on the right side for whatever reason, got the compresser out and inflated them all to 37 going with the DIC reading. they were reading 32 or lower. the 18's I run have a max 44 psi so I go with something right in the middle between 32 and 44
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Old 09-07-2010, 10:16 PM   #8
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Quote:
Originally Posted by grip750 View Post
I set mine to about 40, in a couple of weeks it is at 36-37. Just easier for me to not have to add air every month.
Just a recommendation, but tire pressures should be checked at least once a week manually, and adjusted thereafter. Just a few psi off can increase load, fuel mileage, tire wear/longevity, and of course handling. Sometimes people (not you btw, just happened to quote your post!) forget that tires are the last thing that keeps your car on the road and are an important part of the suspension.

When taking your drivers license in Europe you are taught to check your tire pressure every time you fill up for gas, and they practice that routine quite well! Its a cheap insurance to spend 5 min a week checking pressures, instead of getting a flat tire and having an accident.

32 cold is way to low, as 40 is way to high! Tire pressures usually increase about 2-4 psi when hot, even more when driving hard. That barely gets the 32 up to the proper cold pressure, and almost to 44psi when starting at 40.

I drive an average of about 45k miles/year and have done so for the past 8 years and to this date never had a single flat tire. Although just because I wrote that I'll probably wake up to 2 flat tires tomorrow morning but you get the point
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Old 09-10-2010, 08:08 PM   #9
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My sensors have started to read low, about 3 to 4 lbs below what my guage says...I have two guages and use them both...got any ideas as to why I cannot get them read with the guages>>||?????
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Old 09-10-2010, 11:05 PM   #10
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I set mine to 38 psi cold. I just got my first oil change at a chevy dealer, and today I got an email from onstar telling me that all my tires are low. Apparently they lowered all 4 tires to a cold pressure of 32 psi. To tomorrow I get to go spend a half an hour with my bike pump putting them back to 38. Fun stuff.
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Old 09-10-2010, 11:14 PM   #11
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Quote:
Originally Posted by nalinc23 View Post
Good Morning:

I have the OEM 20's and had a couple questions about the tire pressure/TPMS.

1. When I got the car the tire pressure was showing uniformly in the range of 32-35 psi but I wanted to know what the recommended tire pressure was from everyone and what it was from the manufacturer?

2. It seems like I will add air to the tires to the tune of 35 or so PSI and not too much time will pass and I'll get a warning that the tires are down to 31 or 32 and this is pretty uniform (not a trouble tire for example). Anyone else see the air drop kind of quickly?
LOOK AT THE DRIVER DOOR , the manufacturer did some testes and has the best in mind when they tell you what to do!!!!
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Old 09-10-2010, 11:14 PM   #12
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LOOK AT THE DRIVER DOOR , the manufacturer did some testes and has the best in mind when they tell you what to do!!!!
I wish the service guys would do that.
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Old 09-11-2010, 03:31 PM   #13
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Yeah with my first oil change they were supposed to check the tires for me. I left with 32psi in all four. I have 35psi in them now.
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Old 09-11-2010, 03:32 PM   #14
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Oh and my gas mileage is better now as well.
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Old 09-11-2010, 06:38 PM   #15
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my fronts i run at 36 psi

my rears at 32 psi... this is because I have a wider tire in the rear, with the same aspect ratio. I lowered it so I would have an even contact patch across the tire. If I didn't, the center of my tire would wear faster than the outside
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Old 09-11-2010, 06:44 PM   #16
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Quote:
Originally Posted by danhr View Post
my fronts i run at 36 psi

my rears at 32 psi... this is because I have a wider tire in the rear, with the same aspect ratio. I lowered it so I would have an even contact patch across the tire. If I didn't, the center of my tire would wear faster than the outside
i just put all 4 of mine (19" stock) back to 37 psi. Compared to my last car, these tires are SIGNIFICANTLY less low-profile. So I'll go with the slightly harsher ride to get some better gas milage.
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Old 09-14-2010, 04:52 PM   #17
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The Door Sticker is the best place to start. Some spritied drivers add a couple of pounds for better handling but this will cause the ride to stiffen. Here is a link from Tire Rack regarding air pressue.
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Old 09-14-2010, 04:58 PM   #18
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Quote:
Originally Posted by danhr View Post
my fronts i run at 36 psi

my rears at 32 psi... this is because I have a wider tire in the rear, with the same aspect ratio. I lowered it so I would have an even contact patch across the tire. If I didn't, the center of my tire would wear faster than the outside
what tire/wheel set-up do you run? Typically the issue you mention above would be the result of a wrong size tire vs rim.

You may have more of an even contact patch, but the tire is not operating in the pressure/temperature it needs to give the best handling.

/Erik
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Old 09-14-2010, 05:56 PM   #19
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Ok, so related question: when driving on the track - not drag racing - should you increase the pressure or decrease? By how much?

When I ride my motorcycle on the track, I always remove 3-4 lbs per tire, then after the 1st session, recheck and fill or let more out.

I've seen some people add air when I think that's the opposite based on heat buildup. Some track classes have also said to increase pressure.

Thanks!
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Old 09-15-2010, 11:10 AM   #20
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Quote:
Originally Posted by Michael_Js View Post
Ok, so related question: when driving on the track - not drag racing - should you increase the pressure or decrease? By how much?

When I ride my motorcycle on the track, I always remove 3-4 lbs per tire, then after the 1st session, recheck and fill or let more out.

I've seen some people add air when I think that's the opposite based on heat buildup. Some track classes have also said to increase pressure.

Thanks!
Well, typically tire pressures raise quite a bit when at the track. Certain tires more then others though. Now certain tracks that have ovals and a high banking might require a little more pressure in the right front, but generally air needs to be removed.

With my Nitto's I usually start at 30/31, and adjust after a few laps depending on temps and pressure. My Toyo's get hotter so usually start about 29/30.

But everyday at the track is different, ambient temperature, humidity, driving style, suspension set-up, alignment etc all play a factor in it so where the final number is always the same for a certain tire, the starting pressure could be different every time.
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Old 09-15-2010, 12:57 PM   #21
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Thanks Erik...I'll start lower and check from there!
9/22 Willow Springs, CA!
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Old 09-15-2010, 01:18 PM   #22
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Quote:
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Thanks Erik...I'll start lower and check from there!
9/22 Willow Springs, CA!
No problem, let me know if you have any questions at all. You can always call if you need any help when on the track!

Let us know how you do!

/Erik
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