Hi there. Can someone explain how to recalibrate the speedometer after a gear change?
Thanks!
Thanks!
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Ahhhh good to know. Thanks!Pretty sure speedo is based on wheel speed sensors...not the transmission.
So...tire diameter (rotations per mile, etc) creates the speed reading and nothing else. Problem is, there is no simple way to adjust the speedo (that I know of) except in your head.
If it drives you crazy, download one of a zillion GPS-based speedometers on your phone long enough to get a sense for it. With a decent sky view, they are pretty dang accurate.
Pretty sure speedo is based on wheel speed sensors...not the transmission.
So...tire diameter (rotations per mile, etc) creates the speed reading and nothing else. Problem is, there is no simple way to adjust the speedo (that I know of) except in your head.
If it drives you crazy, download one of a zillion GPS-based speedometers on your phone long enough to get a sense for it. With a decent sky view, they are pretty dang accurate.
There is a way to adapt a Hypertech speedometer calibrator. I did short write-up in a previous thread HERE.
Took more time to research than install.
Yeller Yellow Box
Official home page of the Yellow Box Speedo Recalibrator
YellR manufactures the Yellow Box; World's best Speedometer Recalibrator for motorcycles, cars and trucksyellr.com
Thanks for the research and info!
Am I understanding that this mod only effects the dash speedometer readout? And it does not rectify the speed within the various ECUs?
As I'm on 35s now, the speedo reads about 10% low. No big deal but it does impact several of the auxiliary systems such as AHC. AHC lowers the suspension at highway speeds, ~60mph. This is useful for gas savings but also when I tow as it has the dynamic effect of increasing hitch weight distribution tension for more high speed stability. Or things like the range miles to empty (which this may fix as it's in the gauge cluster?).
I heard about these years ago because my buddy @Higgin told me about them way-back-when he had his 80. I have never used one, but I do own the device for a 200 still sitting in the packaging. Since I was only 1-2 MGP off with my 285/65/18 tires I never felt the need to install it. I am gearing up for some major upgrades over the winter, which will include some 35s and I'll definitely want to get the Yellr installed. I'm happy make a video or post up feedback.@Eric Sarjeant
Hey Eric,
Would be interested in any info re installing these on 200’s if you guys have done it... Info on their site seems a little vague on vehicle specifics.
Yeller Yellow Box
Official home page of the Yellow Box Speedo Recalibrator
YellR manufactures the Yellow Box; World's best Speedometer Recalibrator for motorcycles, cars and trucksyellr.com
I had one of these on the 80 years ago. Super simple to install. It did affect the cruise control as I understand.
No experience with the 200 I would imagine a little more involved with everything being computer controlled and "by wire".
Correct, unlike the old days the speed is calculated as an average of the wheel speed sensors, not by the drivetrain. So gearing changes don't affect it.So 4.88 gears are installed in my rig and I haven't seen any issues with the speedo. My speedo is off because of my tire size (34's), just a few MPH over what the speedometer shows. Not a big deal to me.
i don't think this is a toyota feature. big 35s I run 9% fast on speedo.I know other manufactures dealer can usually change the REV's Per Mile usually up to a 315 tire size , anyone know if the dealer or Tech Steam is there any REV Per mile adjustment ?