Adjust TPMS range
Drifting
Joined: Oct 2004
Posts: 1,975
Likes: 9
From: "Philly" Pennsylvania
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.
All computer software programs (code) can be edited, the question is how to get access and then re-enter the altered program it. Call Chuck @ Corvettes of Westchester (CoW), he is deep into our computers and might be your best shot at doing it.
Last edited by tsts; Oct 9, 2010 at 01:36 AM.
Instructor
Joined: Mar 2010
Posts: 126
Likes: 0
From: CORPUS CHRISTI TEXAS
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.
However, I purchased a set of Pirelli tires, and was told the psi rating on the tires are min/max. They say the car mfg sets the accepted PSI, not the tire mfg.
http://www.us.pirelli.com/web/techno...l/default.page
Race Director
Joined: Apr 2007
Posts: 11,150
Likes: 890
From: South Western Ontario
If the BCM was hacked then we'd be able to also do other fun things like make the fog lights stay on with the high beams or have a custom start up message on the DIC.
It's not lacking any "thinking outside the box". It's a lacking of any programming tools to do the change. If you have the right skills and tools you could likely pull the chip from the BCM and read the program and then de-compile it and figure it out but that's well above the technical ability of most on this site. Besides a lot of work it's also dumb since the simple and correct solution is to lower the pressure to match what the door sticker says.
Peter
Last edited by lionelhutz; Oct 9, 2010 at 01:29 PM.
Melting Slicks
Joined: Jun 2010
Posts: 2,809
Likes: 3
From: Yorktown Virginia
It's done in the BCM which appears to have never been hacked (well you might be able to open and un-solder and replace chips to do something with it) so no-one does custom programming of it. The only thing that can be done is tthat the TPMS system can be turned off in the 2001 and newer C5's, the option was added so Z06's could have the TPMS off and is one of a number of options which can be changed using a TechII.
If the BCM was hacked then we'd be able to also do other fun things like make the fog lights stay on with the high beams or have a custom start up message on the DIC.
It's not lacking any "thinking outside the box". It's a lacking of any programming tools to do the change. If you have the right skills and tools you could likely pull the chip from the BCM and read the program and then de-compile it and figure it out but that's well above the technical ability of most on this site. Besides a lot of work it's also dumb since the simple and correct solution is to lower the pressure to match what the door sticker says.
Peter
If the BCM was hacked then we'd be able to also do other fun things like make the fog lights stay on with the high beams or have a custom start up message on the DIC.
It's not lacking any "thinking outside the box". It's a lacking of any programming tools to do the change. If you have the right skills and tools you could likely pull the chip from the BCM and read the program and then de-compile it and figure it out but that's well above the technical ability of most on this site. Besides a lot of work it's also dumb since the simple and correct solution is to lower the pressure to match what the door sticker says.
Peter
Most likely there are only a few guys who know exactly what to do and how to reprogram the BCM and 90% of them are going to be ones who designed it. So yes its possible but GM put a lot of money into R&D and Im sure they know what pressure you should run in your tires for everyday driving on the street.
Tech Contributor
Joined: Dec 2003
Posts: 19,384
Likes: 87
From: Horncastle Lincolnshire, England
2023 C5 of the Year Finalist - Unmodified
The OEM tires were designed with a stiff sidewall to give 200 miles when deflated. That gives a very hard ride and, even at the Corvette design pressure of 30 psi cold, I used to suffer from "tram-lining".
I fitted Michelin AS ZPs at 21k miles which have a softer sidewall (but can only run 50 miles deflated). I run them at 28 psi cold which gives about 32 hot. My wear has been even over the tread depth over about 22k miles. Those that have run at 30 psi cold have reported excessive center wear which is symptomatic of over inflation.
I just can't imagine how harsh the ride is at 40 psi plus. I also can't imagine any Corvette engineer who knows anything about this car changing the TPS values to unsafe figures. Its just not safe to run at the max rating.
BTW the over pressure warning cuts in at 46psi
I fitted Michelin AS ZPs at 21k miles which have a softer sidewall (but can only run 50 miles deflated). I run them at 28 psi cold which gives about 32 hot. My wear has been even over the tread depth over about 22k miles. Those that have run at 30 psi cold have reported excessive center wear which is symptomatic of over inflation.
I just can't imagine how harsh the ride is at 40 psi plus. I also can't imagine any Corvette engineer who knows anything about this car changing the TPS values to unsafe figures. Its just not safe to run at the max rating.
BTW the over pressure warning cuts in at 46psi
Last edited by DeeGee; Oct 9, 2010 at 05:13 PM.
Drifting
Joined: Oct 2004
Posts: 1,975
Likes: 9
From: "Philly" Pennsylvania
It's done in the BCM which appears to have never been hacked (well you might be able to open and un-solder and replace chips to do something with it) so no-one does custom programming of it. The only thing that can be done is tthat the TPMS system can be turned off in the 2001 and newer C5's, the option was added so Z06's could have the TPMS off and is one of a number of options which can be changed using a TechII.
If the BCM was hacked then we'd be able to also do other fun things like make the fog lights stay on with the high beams or have a custom start up message on the DIC.
It's not lacking any "thinking outside the box". It's a lacking of any programming tools to do the change. If you have the right skills and tools you could likely pull the chip from the BCM and read the program and then de-compile it and figure it out but that's well above the technical ability of most on this site. Besides a lot of work it's also dumb since the simple and correct solution is to lower the pressure to match what the door sticker says.
Peter
If the BCM was hacked then we'd be able to also do other fun things like make the fog lights stay on with the high beams or have a custom start up message on the DIC.
It's not lacking any "thinking outside the box". It's a lacking of any programming tools to do the change. If you have the right skills and tools you could likely pull the chip from the BCM and read the program and then de-compile it and figure it out but that's well above the technical ability of most on this site. Besides a lot of work it's also dumb since the simple and correct solution is to lower the pressure to match what the door sticker says.
Peter
Wanna guess what Chuck from Corvettes of Westchester studied when he went to college before he got into corvettes?
Its worth a shot to ask if he can/would do it.
Chuck - let 'em spin - Tim S.
Race Director
Joined: Apr 2007
Posts: 11,150
Likes: 890
From: South Western Ontario
Well there might be some people with knowledge about it but they're not sharing. I recall some guys that demo'd how they could steal a C6 by turning off the need for the fob (which is in the C6 BCM, and that is not a C5 BCM).
There was a thread here at one time with lots of good ideas that could be done with BCM programming software, so lots of owners are dreaming about it. But, no realization of the dream.
Peter
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Former Vendor
Joined: Nov 2005
Posts: 11,792
Likes: 255
From: Ossining New York
St. Jude Donor '07-'08-'09-'10-'12-'13-'14
I'm quite confident.....
If a member wants to think a little different, I'm O.K. with that - we might learn something new - or not. I'm not saying I agree or disagree with his reasoning or goals but he can be allowed to explore.
Wanna guess what Chuck from Corvettes of Westchester studied when he went to college before he got into corvettes?
Its worth a shot to ask if he can/would do it.
Chuck - let 'em spin - Tim S.
Wanna guess what Chuck from Corvettes of Westchester studied when he went to college before he got into corvettes?
Its worth a shot to ask if he can/would do it.
Chuck - let 'em spin - Tim S.
Sort of in the same way they modify the MAF SENSORS....
That's where I would start.
Chuck CoW
Drifting
Joined: Oct 2004
Posts: 1,975
Likes: 9
From: "Philly" Pennsylvania
[QUOTE=lionelhutz;1575573870]Sure, however the BCM hasn't been hacked to the point there is programming software available so you can think outside of the box
(How do you come by this fact/knowledge?)
Well there might be some people with knowledge about it but they're not sharing.
I would not feel that I would have to share such knowledge if I could do it or had done it! The requests to do that type of work would be endless and I certainly would not want to target my business on that type of work. Mainly because some people might get upset at the thought of doing this and try to take advantage or cause problems (legal or business).
(How do you come by this fact/knowledge?)
Well there might be some people with knowledge about it but they're not sharing.
I would not feel that I would have to share such knowledge if I could do it or had done it! The requests to do that type of work would be endless and I certainly would not want to target my business on that type of work. Mainly because some people might get upset at the thought of doing this and try to take advantage or cause problems (legal or business).
Melting Slicks
Joined: Feb 2007
Posts: 3,266
Likes: 8
From: Indian Rocks Beach FL
St. Jude Donor '08-'09-'10
While you may (or may not) be able to indemnify yourself against a customer you performed this service for, that indemnification would not apply to any third party injured as a result of your actions. If you performed this service for yourself and a third party was injured as the result of an accident again you would be liable.
In other words, good luck with that.
In other words, good luck with that.
Drifting
Joined: Oct 2004
Posts: 1,975
Likes: 9
From: "Philly" Pennsylvania
While you may (or may not) be able to indemnify yourself against a customer you performed this service for, that indemnification would not apply to any third party injured as a result of your actions. If you performed this service for yourself and a third party was injured as the result of an accident again you would be liable.
In other words, good luck with that.
In other words, good luck with that.
You do realize that by enabling the vehicle operator to read & understand his tire pressures by altering the code range, the person who changes the code is not promoting or encouraging higher tire pressures - just the ability to understand them better. In fact, one could argue that this in fact promotes tire safety by permitting to operator the ability to better understand the conditions he has created.
Last edited by tsts; Oct 10, 2010 at 10:06 PM.
Race Director
Joined: Apr 2007
Posts: 11,150
Likes: 890
From: South Western Ontario
Originally Posted by tsts;1575581153
[COLOR="Red"
[COLOR="Red"
(How do you come by this fact/knowledge?)[/COLOR]
OK, I'm not really waiting, I being facetious.
Peter
Drifting
Joined: Oct 2004
Posts: 1,975
Likes: 9
From: "Philly" Pennsylvania
Besides, I believed you when you said "the BCM hasn't been hacked to the point there is programming software available".
Last edited by tsts; Oct 10, 2010 at 10:20 PM.
