just as the title says. I searched, albeit, briefly and didn't have luck. Can you adjust the speedometer after you go bigger on tires?
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just as the title says. I searched, albeit, briefly and didn't have luck. Can you adjust the speedometer after you go bigger on tires?
^^^^I don't have the stock Navi but I was under the impression the Navi tire settings was only for dead reckoning for Navi purposes, like going into a tunnel or garage. You're saying it corrects the speedometer needle and odometer on your instrument cluster?
Are you not running 5.29 gears with your 38's? That would correct your speedometer right there.
On my 2004 LX470, I used the nav screen or the screen under settings. There is a button you could push to calibrate with new/bigger tires. I have 38x15.5 and my speedometer is dead on. No additional install or cost.
The first box in setup is calibration. Click the change on that. It gives you a new tires calibration click that and it says it's calibrating. I have not had an opportunity to get on the interstate but at 45 my speed app says I was going 46. I only knew what my speed was on the interstate so I'll keep you posted
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I love for it to be that simple, but as stated above, I suspect this is for Nav distance estimation on a weak/missing GPS signal, not (dash) speedometer correction.
It's easy enough to test your theory on the drive home, but I am skeptical.
3-5mph off at what speed? Generally, your speedo would be off by a percentage. Mine is off ~5.1%. For me at least, in town it is pretty much insignificant. At freeway speeds, it may start becoming significant at 85, it's up to ~+4.25mph
Was off 3-5 between 45-60, the higher the speed the more is off. Remember your speedo is no longer analog it may look analog but it's solely control by a computer. I have pulled my nav in my car, completely removed the nav brain, stereo brain, and amp. As it stand I retained the Lexus nav screen so I can control the AC. Remember these cars ac is controlled by the same screen as the nav but my trip info is still functional on the same screen. This tells me speed and mileage/speed information is independent from the navigation.
This is what I done with nav and stereo:
Successfully Moved Navigation Screen To Make Room Pioneer AVIC-8200
Why is it that I'm hearing Bruce Campbell's voice as Ash (Army of Darkness) directed at me, in the back of my mind as I read the above...
Ash: Don't touch that please, your primitive intellect wouldn't understand alloys and compositions and things with... molecular structures.
After hitting the Nav "setup" --> "calibrate" --> "tire change" and traveling ~15mi at speeds from 30-70mph, I am not seeing any difference in speedometer error.
Yes, I'm pretty familiar with how the speedometer works after chasing it through the EWD to install my son's yellow box. The sensor on the drivetrain sends pulses to the ECU, the speed is determined/calculated by the frequency of the pulses. The typical speedometer adjustment boxes take the original pulses as input, and applies a "multiplier" to generate a modified output signal to correct the error.
Yes, I've seen the SAS thread, and the MFD relocation threads for your vehicle.
Yes, I am aware of the different systems controlled through the MFD.
So your explaining that, a screen that you can no longer reach (because of the equipment that you yanked), somehow automagically reprogrammed a the tire size in the ECU, (or some other part that you didn't yank), and strangely enough, this parameter doesn't seem to appear anywhere in Techstream?
I don't be think it fixed mine. I will be able to tell for sure tomorrow after I get on the freeway.
JLB, how hard was it to install and calibrate the yellow box?
At the end of the day. My speedometer was off after the SAS and tire size increase, it was a concern of mine before the swap. All I did was calibrate the system through the nav/setup. As it stands my speedo is dead on when approaching those radar controlled signs as well as verifying with my wife's car next to me, tested at various speed. Not sure what the deatails are but I have no issues with speedometer. I was skeptical initially but it's been over 2 years and still no issues even with the equipment yanked out. The only thing I could think of is the parameter value is stored some where only a computer is the only thing that could change it, lack of power or other variables cannot effect it. Maybe is similar to the way new computers can keep track of license keys ( once entered you don't have to re-enter even if you change hdd or reinstall Windows. As a preventive for piracy.). I'm not saying I'm right or wrong but it worked for me. Last time I checked there not many LX470 running 38 x15.5 and to have no issues with speedometer is even better.
If the 100 is anything like 80 there are more than 1 VSS. On an 80 series the VSS for the gauge cluster does not talk to the ECU for it has its own VSS.