nav owners - you can change the tire sizes in the computer
03-25-2002, 03:16 PM
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The Doctor
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nav owners - you can change the tire sizes in the computer
if you get new wheels you don't have to worry about staying within the factory spec on overall diameter. In the nav diagnostic menu you can actually select the tire size so that your speedo will be calibrated with your selection. cool huh
03-25-2002, 03:41 PM
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Ok...this really interests me...my wheels are coming in a few days. Is there any way you could post how?? Because I never remembered seeing anything like that in there. 
03-25-2002, 06:42 PM
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start up procedure:
1. turn the ignition switch ON (II), then press and hold the keys in this order: 1) MENU key, 2) MAP/GUIDE key, 3) CANCEL key, and keep them pressed simultaneously
2. After the display changes to the diagnosis menu screen, touch the item you want to check.
3. Touch tire-calibrate
'00 model:
The AUTO TUNING is factory set to ON
The TIRE-CAL TUNING is used when you want to change your setup
99' model:
pretty much the same
above is from the Helm's manual
1. turn the ignition switch ON (II), then press and hold the keys in this order: 1) MENU key, 2) MAP/GUIDE key, 3) CANCEL key, and keep them pressed simultaneously
2. After the display changes to the diagnosis menu screen, touch the item you want to check.
3. Touch tire-calibrate
'00 model:
The AUTO TUNING is factory set to ON
The TIRE-CAL TUNING is used when you want to change your setup
99' model:
pretty much the same
above is from the Helm's manual
03-25-2002, 06:49 PM
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This is very interesting. I went to the tire calibration screen and found that my -1.8% standard had gone up to -2.3%. There is also a button to enable/disable the automatic adjustment (don't know why you'd want to disable it).
However, I tend to believe that these systems (speedo and navi) are not able to talk to each other. I think that screen is probably just to help the navi track and show your vehicle where it's supposed to be on the map.
I did a search and found that Daverman made an in-depth post on this diagnostic screen and it's adjustments... Any more news since mid last year, Daverman?
Here's a link to his old post:
Post
However, I tend to believe that these systems (speedo and navi) are not able to talk to each other. I think that screen is probably just to help the navi track and show your vehicle where it's supposed to be on the map.
I did a search and found that Daverman made an in-depth post on this diagnostic screen and it's adjustments... Any more news since mid last year, Daverman?
Here's a link to his old post:
Post
03-25-2002, 07:06 PM
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hmm.. you might be right.. 
Originally posted by fla-tls
This is very interesting. I went to the tire calibration screen and found that my -1.8% standard had gone up to -2.3%. There is also a button to enable/disable the automatic adjustment (don't know why you'd want to disable it).
However, I tend to believe that these systems (speedo and navi) are not able to talk to each other. I think that screen is probably just to help the navi track and show your vehicle where it's supposed to be on the map.
I did a search and found that Daverman made an in-depth post on this diagnostic screen and it's adjustments... Any more news since mid last year, Daverman?
Here's a link to his old post:
Post
This is very interesting. I went to the tire calibration screen and found that my -1.8% standard had gone up to -2.3%. There is also a button to enable/disable the automatic adjustment (don't know why you'd want to disable it).
However, I tend to believe that these systems (speedo and navi) are not able to talk to each other. I think that screen is probably just to help the navi track and show your vehicle where it's supposed to be on the map.
I did a search and found that Daverman made an in-depth post on this diagnostic screen and it's adjustments... Any more news since mid last year, Daverman?
Here's a link to his old post:
Post
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03-25-2002, 07:08 PM
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OK...this is extremely interesting and very new to me. This is one thing Daverman said:
I need to know this for sure...i have a few days left until my wheels are here and mounted. Do I need to change it or will it really calibrate itself after time??
Man I am DUMB on this stuff. In the AM i'm gonna go out there and check some of this stuff out without changing anything. Perhaps Daverman can confirm for us that no changing is necessary with the aftermarket 19's??
The only time that you need to change your tire calibration is when you change the size of your wheel. But even then the Navi will eventually catch up with you, so just leave it alone
Man I am DUMB on this stuff. In the AM i'm gonna go out there and check some of this stuff out without changing anything. Perhaps Daverman can confirm for us that no changing is necessary with the aftermarket 19's??
03-25-2002, 07:12 PM
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Originally posted by ken2000ac
Do I need to change it or will it really calibrate itself after time??
Do I need to change it or will it really calibrate itself after time??
Again - I presume it's probably a navi-only adjustment, independent of the speedo.
03-25-2002, 11:44 PM
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OK, fla-tls, here I am 
The tire calibration is very simple: it basically correlates the VSS (vehicle speed sensor) pulses with distance travelled. I believe the VSS signal is the same one used by the ECU to compute vehicle speeds.
ken2000ac: my suggestion: leave it alone, and leave the automatic adjustment on. As you've seen already, the Navi will eventually calibrate the adjustment automatically (it compares the VSS pulses against the GPS distance travelled and compensates slowly). It will probably be fully compensated within 3-5 days of driving.
And yes, it is navi-only. The speedo is a separate deal altogether.
I haven't been fooling around with the Navi lately--it's been working fine for me. I've never found a way to make the colors stick either.
But I have discovered that the Navi DVD is readable on a DVD-ROM drive. Its files can be easily viewed and read on a Windows machine, and the file contents don't seem to be encrypted at all. The files are in some database format. I've discovered that the data uses a very old (but good) compression scheme: it tokenizes commonly-used strings and stores them in a dictionary.
With some snooping around we may be able to find where the sound waves and color settings are stored. Does anyone have a DVD writer?
The tire calibration is very simple: it basically correlates the VSS (vehicle speed sensor) pulses with distance travelled. I believe the VSS signal is the same one used by the ECU to compute vehicle speeds.
ken2000ac: my suggestion: leave it alone, and leave the automatic adjustment on. As you've seen already, the Navi will eventually calibrate the adjustment automatically (it compares the VSS pulses against the GPS distance travelled and compensates slowly). It will probably be fully compensated within 3-5 days of driving.
And yes, it is navi-only. The speedo is a separate deal altogether.
I haven't been fooling around with the Navi lately--it's been working fine for me. I've never found a way to make the colors stick either.
But I have discovered that the Navi DVD is readable on a DVD-ROM drive. Its files can be easily viewed and read on a Windows machine, and the file contents don't seem to be encrypted at all. The files are in some database format. I've discovered that the data uses a very old (but good) compression scheme: it tokenizes commonly-used strings and stores them in a dictionary.
With some snooping around we may be able to find where the sound waves and color settings are stored. Does anyone have a DVD writer?
03-26-2002, 06:10 PM
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Originally posted by ken2000ac
Dude I really appreciate it!! I'll be checking this thread to see what the deal is!
Thanx!!!!!
Dude I really appreciate it!! I'll be checking this thread to see what the deal is!
Thanx!!!!!
Apparently, it's pretty quick to adjust.
03-26-2002, 06:38 PM
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Originally posted by daverman
But I have discovered that the Navi DVD is readable on a DVD-ROM drive. Its files can be easily viewed and read on a Windows machine, and the file contents don't seem to be encrypted at all. The files are in some database format. I've discovered that the data uses a very old (but good) compression scheme: it tokenizes commonly-used strings and stores them in a dictionary.
With some snooping around we may be able to find where the sound waves and color settings are stored. Does anyone have a DVD writer?
But I have discovered that the Navi DVD is readable on a DVD-ROM drive. Its files can be easily viewed and read on a Windows machine, and the file contents don't seem to be encrypted at all. The files are in some database format. I've discovered that the data uses a very old (but good) compression scheme: it tokenizes commonly-used strings and stores them in a dictionary.
With some snooping around we may be able to find where the sound waves and color settings are stored. Does anyone have a DVD writer?
Startup mod link
Too bad... Any more info would be great! I'd love to edit the voice with my own custom messages...
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