Stock tire pressure for GT500 - Ford Mustang Forum
 
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post #1 of 13 (permalink) Old 10-23-2008 Thread Starter
 
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Stock tire pressure for GT500

I recently bought a set of take-off GT500 wheels and tires for my 07 GT, and was wondering if anyone knows what the correct manufacturer's recommended tire pressure is for this tire/rim combo.

For the first two weeks, everything was fine, but now my "low tire pressure" warning light is going off. I am currently at 30 psi on all four tires, with no leakage since purchasing. Is this correct, or close?

Thanks in advance!

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post #2 of 13 (permalink) Old 10-23-2008
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Quote:
Originally Posted by XR7GTVIII View Post
I recently bought a set of take-off GT500 wheels and tires for my 07 GT, and was wondering if anyone knows what the correct manufacturer's recommended tire pressure is for this tire/rim combo.

For the first two weeks, everything was fine, but now my "low tire pressure" warning light is going off. I am currently at 30 psi on all four tires, with no leakage since purchasing. Is this correct, or close?

Thanks in advance!
There isn't a "stock" tire pressure recomendation from the car company. Each tire has it's own recommended air pressure range printed on the tire itself.

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post #3 of 13 (permalink) Old 10-23-2008
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The same tire can be used on a variety of vehicles, so the tire pressure molded into the tire is a general value. The manufacturer's specifications take into account the specific vehicle and the stock tires, and supersede the tire pressure listed on the tire. As I recall, the factory tire pressure is 35psi for all 4 tires on the Shelby GT500.

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post #4 of 13 (permalink) Old 10-23-2008
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For a starting point, find a GT500 and look at the door jamb sticker. It probably says 32 psi F/R.

I run a couple extra in front, above the couple extra I run all around, because I like the slight improvement in response and predictability.

At the drag strip, the tire sidewall maximum in front, what works (4-6 under normal) in the rear.

For more lessons in tire pressure, including high-performance use, go to TireRack.com and find the tech pages. They indicate how much added pressure is useful for sustained high speeds, with given car weights and tire designations.

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post #5 of 13 (permalink) Old 10-25-2008 Thread Starter
 
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Thanks for the replies.............

Checked out a GT500 at the dealership, and the sticker in the door jam states 35 psi.

I geuss I now know why my tire pressure light was on.............
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post #6 of 13 (permalink) Old 12-06-2008
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The 07's were the first year of the Mustangs to have the TPM system, and the your new rims and tires do not have the TPM module in them, you will have the low tire pressure warning,,,, If they did have the modules,,, you have to get the TPM monitoring system retrained to the new modules.

I have an 07 V6, and a month ago got a deal on some brand new 09 GT wheels, so my TPM flashes at me occasionally. Until i get the TPM system retrained, I'll be doing frequent pressure checks.

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post #7 of 13 (permalink) Old 12-07-2008
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The GT 500 sticker pressure is 35psi.


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post #8 of 13 (permalink) Old 12-14-2008 Thread Starter
 
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Quote:
Originally Posted by Mac The Knife View Post
The 07's were the first year of the Mustangs to have the TPM system, and the your new rims and tires do not have the TPM module in them, you will have the low tire pressure warning,,,, If they did have the modules,,, you have to get the TPM monitoring system retrained to the new modules.

I have an 07 V6, and a month ago got a deal on some brand new 09 GT wheels, so my TPM flashes at me occasionally. Until i get the TPM system retrained, I'll be doing frequent pressure checks.
The rims/tires I bought were 07's, and I have an 07. For the first couple of weeks I had no warning light, than it came on. Re-checked the pressure, filled to 35 psi, and the light went out.

For the past few weeks, the light has come back on, and will not go out. The pressure is fine. I've even had a "TPM fault" message flash for a few days during this ( it's now back to the "low tire pressure" message ). Kinda frustrating.

How does one go about "re-training" the TPM system?
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post #9 of 13 (permalink) Old 12-29-2008
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Quote:
Originally Posted by dakine858 View Post
There isn't a "stock" tire pressure recomendation from the car company. Each tire has it's own recommended air pressure range printed on the tire itself.
No, that's not true. Each tire has a maximum PSI which will allow you to drive on it safely. Your car has a recommended tire pressure (usually 30-35 PSI) which is based on the weight distribution of the car to help the tire wear evenly. On all of the '05+ Mustangs you should have 35PSI in your tire unless you have some after market wheels with a 35 sidewall or smaller (in which case you should use about 40-45PSI)

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Quote:
Originally Posted by XR7GTVIII View Post
The rims/tires I bought were 07's, and I have an 07. For the first couple of weeks I had no warning light, than it came on. Re-checked the pressure, filled to 35 psi, and the light went out.

For the past few weeks, the light has come back on, and will not go out. The pressure is fine. I've even had a "TPM fault" message flash for a few days during this ( it's now back to the "low tire pressure" message ). Kinda frustrating.

How does one go about "re-training" the TPM system?
Stop by your local Discount Tire store and simply ask them to reset your TPMS sensors and they will gladly do it free of charge.

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Quote:
Originally Posted by Mac The Knife View Post
The 07's were the first year of the Mustangs to have the TPM system, and the your new rims and tires do not have the TPM module in them, you will have the low tire pressure warning,,,, If they did have the modules,,, you have to get the TPM monitoring system retrained to the new modules.

I have an 07 V6, and a month ago got a deal on some brand new 09 GT wheels, so my TPM flashes at me occasionally. Until i get the TPM system retrained, I'll be doing frequent pressure checks.
When get new wheels for your car, if your old wheels had TPMS sensors in them they are supposed to take the sensors out and put them in the new wheels.

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Quote:
Originally Posted by Gary Paul View Post
The same tire can be used on a variety of vehicles, so the tire pressure molded into the tire is a general value. The manufacturer's specifications take into account the specific vehicle and the stock tires, and supersede the tire pressure listed on the tire. As I recall, the factory tire pressure is 35psi for all 4 tires on the Shelby GT500.
You're exactly right. Do you work on tires or do you just read up on them?

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Pressure varies

Quote:
Originally Posted by johnnshepherd View Post
No, that's not true. Each tire has a maximum PSI which will allow you to drive on it safely. Your car has a recommended tire pressure (usually 30-35 PSI) which is based on the weight distribution of the car to help the tire wear evenly. On all of the '05+ Mustangs you should have 35PSI in your tire unless you have some after market wheels with a 35 sidewall or smaller (in which case you should use about 40-45PSI)
Actually, the GT jamb sticker recommends 32psi cold. V6s are 35psi cold.
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