Tpms
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Le Mans Master
Joined: Nov 2001
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From: Kern County CA
Tpms
I'm wondering at what pressure will the DIC show a low pressure message? For the OEM runflats, I've seen the message come on, I checked the tires and they were anywhere from 20-22. So I assumed that GM programmed the DIC to display the low pressure warning when the pressure dropped to about 23.
Now that I have Nitto Invos tires (not runflats), I think they cannot be safely driven on at 20-22 psi. Is it possible to have the low pressure warning displayed at a higher reading, say about 25-26?
Thanks,
Now that I have Nitto Invos tires (not runflats), I think they cannot be safely driven on at 20-22 psi. Is it possible to have the low pressure warning displayed at a higher reading, say about 25-26?
Thanks,
Le Mans Master
Joined: Sep 2008
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From: Stafford VA, home of our wolf den. No house break ins to date.
NHTSA set the majic "notification number" at 25% inflation loss from o.e. pressure. Whether or not GM bumped that down you will have to find out from GM, they can not bump it up (30%...). You will also need to check with someone in gm on how to make it trigger sooner, my thinking is you will have to change the sensors, and those pups are not cheap...
of course, you should check your pressure before each "drive off", and im sure you do. if a tire begins to go down, you should be able to sense it being that its not a run flat... esp. on the front... because of the tread width, it will start to pull.
of course, you should check your pressure before each "drive off", and im sure you do. if a tire begins to go down, you should be able to sense it being that its not a run flat... esp. on the front... because of the tread width, it will start to pull.
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I'm wondering at what pressure will the DIC show a low pressure message? For the OEM runflats, I've seen the message come on, I checked the tires and they were anywhere from 20-22. So I assumed that GM programmed the DIC to display the low pressure warning when the pressure dropped to about 23.
Now that I have Nitto Invos tires (not runflats), I think they cannot be safely driven on at 20-22 psi. Is it possible to have the low pressure warning displayed at a higher reading, say about 25-26?
Thanks,
Now that I have Nitto Invos tires (not runflats), I think they cannot be safely driven on at 20-22 psi. Is it possible to have the low pressure warning displayed at a higher reading, say about 25-26?
Thanks,
The TPMS has a low pressure range of 24 psi and a high pressure range of 42 psi.
This range is not adjustable.
Tire pressure is not an absolute value. Tire pressure is a result of the size of the tire and the weight of the vehicle which results in a contact patch. This contact patch is supporting XX pounds per square inch of contact. The manufacturers recommendation for the vehicle with OEM size tires is 30 pounds per square inch (PSI.)
Tire pressure will also vary with temperature. If you are seeing cold tire pressures of 22-24 psi you need to add air to your tires, plain and simple. You will need to add more air as the temperature drops. Tire pressure is not a set it and forget it item. Tire pressure will vary approximately 1 psi for each 10 degree change in temperature.
Last edited by talon90; Nov 4, 2008 at 02:45 PM.
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.
The TPMS has a low pressure range of 24 psi and a high pressure range of 42 psi.
This range is not adjustable.
Tire pressure is not an absolute value. Tire pressure is a result of the size of the tire and the weight of the vehicle which results in a contact patch. This contact patch is supporting XX pounds per square inch of contact. The manufacturers recommendation for the vehicle with OEM size tires is 30 pounds per square inch (PSI.)
Tire pressure will also vary with temperature. If you are seeing cold tire pressures of 22-24 psi you need to add air to your tires, plain and simple. You will need to add more air as the temperature drops. Tire pressure is not a set it and forget it item. Tire pressure will vary approximately 1 psi for each 10 degree change in temperature.
This range is not adjustable.
Tire pressure is not an absolute value. Tire pressure is a result of the size of the tire and the weight of the vehicle which results in a contact patch. This contact patch is supporting XX pounds per square inch of contact. The manufacturers recommendation for the vehicle with OEM size tires is 30 pounds per square inch (PSI.)
Tire pressure will also vary with temperature. If you are seeing cold tire pressures of 22-24 psi you need to add air to your tires, plain and simple. You will need to add more air as the temperature drops. Tire pressure is not a set it and forget it item. Tire pressure will vary approximately 1 psi for each 10 degree change in temperature.
pressure is also a result of heat.
the one thing i like about the direct style tpms is that if you notice a particular tire running higher pressure than the others when all are set at cold then it can give you an indication that you may have some "unhappy components" in that tire allowing for more flex and generating the heat. This is something that the tpms wont kick a warning light for, but if you check the pressures on the dic while running on a regular basis, especially if you think you might have a tire problem developing, it can send an early warning signal.
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.
One other thing I would like to hit on in this thread is the O.E. tire pressure, and having read some of talon90's posts, I'm quite sure he knows these facts as well... I'm a tire testing engineer for the Govt, for longer than I care to admit..LOL... The tire is a very complex piece of equipment...all its components are designed to work in harmony to provide the best directional change input from the vehicle, best cornering stability, best water disbursement, and best traction, all while maintain a safe heat index. The O.E. pressure is there for a reason. It's been tested to the max by the vehicle manufacture along with the tire manufacture to make all this come together. Run the O.E. pressure. 
(at the drag strip, you can play with high pressure up front and low in the back..but set it to O.E. before you leave to drive home.)
(at the drag strip, you can play with high pressure up front and low in the back..but set it to O.E. before you leave to drive home.)
