Adjust TPMS range
Thread Starter
Racer
Joined: Jan 2010
Posts: 324
Likes: 2
From: Moreno Valley CA
Adjust TPMS range
I did the cursory search and found plenty on getting the computer to recognize TPMS and that they can't be calibrated. Not what I need.
Is it possible to adjust what the computer sees as acceptable pressures? I have kumho ecsta tires (run flats) and according to the sidewall, max load can be carried at 51 psi. I have about 41 psi in them. The computer keeps giving me "high pressure" warnings. Can this be adjusted to allow 35-45 psi or something along those lines? If so, anyone know if I can do it or does it have to be done by a pro?
Thanks, in advance.
Is it possible to adjust what the computer sees as acceptable pressures? I have kumho ecsta tires (run flats) and according to the sidewall, max load can be carried at 51 psi. I have about 41 psi in them. The computer keeps giving me "high pressure" warnings. Can this be adjusted to allow 35-45 psi or something along those lines? If so, anyone know if I can do it or does it have to be done by a pro?
Thanks, in advance.
Melting Slicks
Joined: Feb 2007
Posts: 3,266
Likes: 8
From: Indian Rocks Beach FL
St. Jude Donor '08-'09-'10
No, it can't and you are using way too much pressure in your tires. 30-35 PSI (cold) maximum is all you need.
Last edited by Mark C5; Oct 7, 2010 at 04:01 PM.
Thread Starter
Racer
Joined: Jan 2010
Posts: 324
Likes: 2
From: Moreno Valley CA
According to who? I'd love to hear from an engineer that designs and tests tires that suggest running them that low. I have read this argument many times. So do tell....what is the advantage to running them that low?
I've never seen a tire that can run 15+ psi lower than what's listed (even though that's for max load) and not wear unevenly. I'm not racing so the traction advantage is moot. The gas mileage is minimal but there is still a difference. The ride isn't uncomfortable at current pressure. So what's the advantage to running even lower? ESPECIALLY on a run flat.
I've never seen a tire that can run 15+ psi lower than what's listed (even though that's for max load) and not wear unevenly. I'm not racing so the traction advantage is moot. The gas mileage is minimal but there is still a difference. The ride isn't uncomfortable at current pressure. So what's the advantage to running even lower? ESPECIALLY on a run flat.
Le Mans Master
Joined: Nov 2005
Posts: 6,993
Likes: 25
The tire pressure recommedations are on the door tag. Max pressure on the side is for max loading-almost no vehicle manufacturer recommends the max pressure on the tire for normal service.
Last edited by dougbfresh; Oct 7, 2010 at 04:26 PM.
Thread Starter
Racer
Joined: Jan 2010
Posts: 324
Likes: 2
From: Moreno Valley CA
Nor am I running max pressure. I'm just not running them THAT low. Additionally, not all tires are designed the same or to run at the same pressures (max or not). The door identifies recommended pressure for the tires it came with, correct?
Perhaps y'all can change my way of thinking but I would certainly need to know more than just assumptions. Sources of your opinions would be great!! Perhaps something from GM or another reputable auto information source that says running any tire on my car should be at the recommended pressure regardless of brand, size, etc.
Oh...and the psi on the side of the tires isn't max pressure, either. It's the pressure at which the tire is capable of bearing the largest load safely. Certainly you don't load up a tire at it's max pressure since that would obviously be more likely to cause a blowout, break a bead, cause a separation, etc.
Perhaps y'all can change my way of thinking but I would certainly need to know more than just assumptions. Sources of your opinions would be great!! Perhaps something from GM or another reputable auto information source that says running any tire on my car should be at the recommended pressure regardless of brand, size, etc.
Oh...and the psi on the side of the tires isn't max pressure, either. It's the pressure at which the tire is capable of bearing the largest load safely. Certainly you don't load up a tire at it's max pressure since that would obviously be more likely to cause a blowout, break a bead, cause a separation, etc.
Last edited by HD_2_C5; Oct 7, 2010 at 04:30 PM.
Melting Slicks
Joined: Apr 2008
Posts: 2,118
Likes: 2
From: Redding CA
ya know i have actually made a thread like this but then i was enlightened...i used to like running about 38 front and 35 rear psi (cold)...gas mileage was a tiny bit better and the car had a little more stability at higher speeds for not have as much sidewall flex... im lowered so the higher pressure made the ride a lot more rough especially with the 18 inch front and 20 inch rear rims...i run 32 front and 30 rear psi (cold) now and its great. hope this helps. there really isnt any advantage running the higher pressure
Last edited by memphis_vette; Oct 7, 2010 at 04:41 PM.
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Thread Starter
Racer
Joined: Jan 2010
Posts: 324
Likes: 2
From: Moreno Valley CA
Doug, thanks for the useful contribution.
The door tag also indicates the tire model and speed rating, both of which are different than current. I'll check to see what tires came with the 02 vert. I can use the max load pressure of those vs factory recommendation as a baseline I guess. Certainly be more informative than "live with it." LOL
The door tag also indicates the tire model and speed rating, both of which are different than current. I'll check to see what tires came with the 02 vert. I can use the max load pressure of those vs factory recommendation as a baseline I guess. Certainly be more informative than "live with it." LOL
Le Mans Master
Joined: Nov 2005
Posts: 6,993
Likes: 25
Doug, thanks for the useful contribution.
The door tag also indicates the tire model and speed rating, both of which are different than current. I'll check to see what tires came with the 02 vert. I can use the max load pressure of those vs factory recommendation as a baseline I guess. Certainly be more informative than "live with it." LOL
The door tag also indicates the tire model and speed rating, both of which are different than current. I'll check to see what tires came with the 02 vert. I can use the max load pressure of those vs factory recommendation as a baseline I guess. Certainly be more informative than "live with it." LOL
Just inflate them to the edge of what the TPMS system allows if you want the message to disappear if you think the higher pressure buys you something.
Last edited by dougbfresh; Oct 7, 2010 at 04:53 PM.
Racer
Joined: May 2001
Posts: 253
Likes: 3
From: The Woodlands Texas
From the 'Tire Rack' web site:
A tire's "maximum inflation pressure" may be different that the assigned tire pressure used to rate the tire's "maximum load." For example, while a P-metric sized standard load tire's maximum load is rated at 35 psi, many P-metric sized standard load performance and touring tires are designed to contain up to 44 psi (and are branded on their sidewalls accordingly). This additional range of inflation pressure (in this case, between 36 and 44 psi) has been provided to accommodate any unique handling, high speed and/or rolling resistance requirements determined by the tire and vehicle manufacturers. These unique tire pressures will be identified on the vehicle placard in the vehicle's owner's manual.
Melting Slicks
Joined: Feb 2007
Posts: 3,266
Likes: 8
From: Indian Rocks Beach FL
St. Jude Donor '08-'09-'10
Running a tire pressure greater than that specified will cause uneven wear with little or no offsetting benefit.
You demand qualifications from those advising you but seem to make your own decisions quite arbitrarily. Or is there some engineering data to support your choice of 41 PSI?
You may want to give this a read:
http://blog.tirerack.com/blog/ethans...re-pressure-is
Or this:
http://www.brighthub.com/diy/automot...les/74883.aspx
Last edited by Mark C5; Oct 7, 2010 at 05:33 PM.
Pro
Joined: Dec 2009
Posts: 719
Likes: 2
From: Columbia South Carolina
Why fight it, the OP asked a question, then gave his own answer and reason.
This is a
question it has been asked many times and answered many times.
Let them run the slightly less then max air pressure for normal street use.
When a blow out is caused, excessive wear is encountered or ride ability sucks,,,,,,,,,,simply sit back and say, " I TOLD YOU SO".
This is a
question it has been asked many times and answered many times. Let them run the slightly less then max air pressure for normal street use.
When a blow out is caused, excessive wear is encountered or ride ability sucks,,,,,,,,,,simply sit back and say, " I TOLD YOU SO".
Advanced
Joined: Jun 2010
Posts: 82
Likes: 1
From: Lebanon Tennessee
Doug, thanks for the useful contribution.
The door tag also indicates the tire model and speed rating, both of which are different than current. I'll check to see what tires came with the 02 vert. I can use the max load pressure of those vs factory recommendation as a baseline I guess. Certainly be more informative than "live with it." LOL
The door tag also indicates the tire model and speed rating, both of which are different than current. I'll check to see what tires came with the 02 vert. I can use the max load pressure of those vs factory recommendation as a baseline I guess. Certainly be more informative than "live with it." LOL
The tire sidewall says max pressure is 44psi
The tag on the DS door says 30 psi, the tag doesn't give a brand name or tire model only the size and speed rating.
So there is a difference of 14 psi (46%) between what the OEM tires say and what GM says....I'd go with GM who designed the car...I run 30psi in all four on mine.
Tech Contributor
Joined: Jan 2007
Posts: 19,246
Likes: 1,093
From: Dyer, IN
According to who? I'd love to hear from an engineer that designs and tests tires that suggest running them that low. I have read this argument many times. So do tell....what is the advantage to running them that low?
I've never seen a tire that can run 15+ psi lower than what's listed (even though that's for max load) and not wear unevenly. I'm not racing so the traction advantage is moot. The gas mileage is minimal but there is still a difference. The ride isn't uncomfortable at current pressure. So what's the advantage to running even lower? ESPECIALLY on a run flat.
I've never seen a tire that can run 15+ psi lower than what's listed (even though that's for max load) and not wear unevenly. I'm not racing so the traction advantage is moot. The gas mileage is minimal but there is still a difference. The ride isn't uncomfortable at current pressure. So what's the advantage to running even lower? ESPECIALLY on a run flat.
Racer
Joined: Feb 2004
Posts: 251
Likes: 0
From: De Pere WI
The tire manufacturer sets the max pressure of the tire. The car manufacture sets the tire pressure. If you run 41 and the center tread wears out faster than the edges you know the tire pressure is too high.
Melting Slicks
Joined: Jun 2010
Posts: 2,809
Likes: 3
From: Yorktown Virginia
When you inflate a tire above the cars manufacture recommended pressure the you will make the tread crown and you will wear the center of the tire and it will not wear evenly.
The pressure rating on the sidewall is for the maximum load that the tire can carry and will maintain maximum tread contact with the ground, gm has done the math and ~30 psi cold provides the largest contact patch which will give you the most traction and best tire wear characteristics.
The pressure rating on the sidewall is for the maximum load that the tire can carry and will maintain maximum tread contact with the ground, gm has done the math and ~30 psi cold provides the largest contact patch which will give you the most traction and best tire wear characteristics.
Race Director
Joined: Apr 2007
Posts: 11,150
Likes: 890
From: South Western Ontario
You're insisting a tire engineer tells you why you should run a lower pressure yet you have no real reason why you are running 41psi. Good luck with that one.
Youi can prove it to yourself. Run them until you hit the wear bars. If you wore the center out long before the edges then you had too much pressure in them.
Peter
PS, I'm running my rear tires which spec a max pressure of 50psi down around 27 to 28 psi cold since the last pair at 30psi wore out in the center first (a lot). They are not the factory tire or the factory size. So far at over 20k miles which is a lot for this tire they have been wearing very evenly.
Youi can prove it to yourself. Run them until you hit the wear bars. If you wore the center out long before the edges then you had too much pressure in them.
Peter
PS, I'm running my rear tires which spec a max pressure of 50psi down around 27 to 28 psi cold since the last pair at 30psi wore out in the center first (a lot). They are not the factory tire or the factory size. So far at over 20k miles which is a lot for this tire they have been wearing very evenly.
Melting Slicks
Joined: Jun 2010
Posts: 2,809
Likes: 3
From: Yorktown Virginia
You're insisting a tire engineer tells you why you should run a lower pressure yet you have no real reason why you are running 41psi. Good luck with that one.
Youi can prove it to yourself. Run them until you hit the wear bars. If you wore the center out long before the edges then you had too much pressure in them.
Peter
PS, I'm running my rear tires which spec a max pressure of 50psi down around 27 to 28 psi cold since the last pair at 30psi wore out in the center first (a lot). They are not the factory tire or the factory size. So far at over 20k miles which is a lot for this tire they have been wearing very evenly.
Youi can prove it to yourself. Run them until you hit the wear bars. If you wore the center out long before the edges then you had too much pressure in them.
Peter
PS, I'm running my rear tires which spec a max pressure of 50psi down around 27 to 28 psi cold since the last pair at 30psi wore out in the center first (a lot). They are not the factory tire or the factory size. So far at over 20k miles which is a lot for this tire they have been wearing very evenly.