Lindenwood
New member
Can you confirm that the odo gets its data from the same sensors?
Speedometer incorrect on 265/70/17 tires
- Thread starter mckennar
- Start date
mckennar
New member
There's an SAE standard out there about these variances. Something about a 4% or 5% allowance across the full range of the speedometer is allowed, caveat being that it's just an SAE standard and not a regulation/law in the US and it doesn't have teeth.
I'm spot on under 40 mph, but see 5% at 75 mph. Between 0 and 75 it's probably less than 4% average. I can't test beyond 75 mph, so there's no telling how far off it is north of there, and no real point in testing anyway because I'll never have any need/desire to go faster than 75 in this thing.
Standard for anyone interested:
J1226: Electric Speedometer Specification--On Road - SAE International
Really the more important question is why did you put OEM Duelers on your truck?
My OEM Duelers were off by 2 mph. My Revos were dead nuts. Looks like my new Michelins are off by 1-2.
Haha it is a long story, but a few weeks back I was going through some issues with two local dealers ref: a bad driver's front wheel bearing growling north of 30 mph. The dealers kept saying it was tires, I had bald (sub-20k mile) Dunlop AT20s that were 2/32 - 3/32 already and figured what the hell.
So I had the dealer replace the tires themselves (so they couldn't point at 3rd-party purchased/installed tires) as a troubleshooting step. TL;DR it didn't fix the noise, the wheel bearing was the issue, and they eventually replaced it under warranty after much gnashing of teeth. I also got a 20% discount on the tires, free mount, balance and alignment because they were wrong. I mean, they still cost more than the set of K02s I just bought for my 3rd gen, but this is just the wifemobile.
Plus, if they wear anything like the AT20s (read: awfully)... I'll be replacing them in 8 - 10 months anyway.
Hadelson
New member
My two cents: Have owned numerous various model Toyota's. With exception of the T4R, found the speedo to be accurate with stock tires/wheels compared to GPS tracking. (Camry's, Highlander and Rav4's)
Both my 4th gen and 5th gen T4R's found the speedo to indicate 2MPH faster then GPS tracking.
Do know that a few years back, there was a class action suit about this same issue related to deliberate speedo settings allowing for faster then actual speed that also resulted in vehicle coming off warranty a couple of hundred miles before actual travelling miles
Both my 4th gen and 5th gen T4R's found the speedo to indicate 2MPH faster then GPS tracking.
Do know that a few years back, there was a class action suit about this same issue related to deliberate speedo settings allowing for faster then actual speed that also resulted in vehicle coming off warranty a couple of hundred miles before actual travelling miles
BlackWorksInc
New member
Yes, all the newer Toyotas use the average between all 4 wheel speed sensors to determine "Vehicle Speed" that is then output from the ABS module via typically a dedicated "VSS (Vehicle Speed Signal" wire to the combination meter where modules like the ECM and Navigation will ask for that data from the Combination Meter.
As far as I am aware there is no calibration mode or adjustment to the Combination Meter.
chris_1001
New member
Speedometers always read high. I did not check out your link. But years ago I had done some research and the thing with speedometers is on a stock tire size, the car should NEVER read slower than the car is going. As mentioned its a percentage error biased on the high side.
This helps to prevent "accidental speeding" (and allows for a margin of error)
Cop cars have calibrated speedometers.
As for my 4R, its dead nuts.
On a side note, If I was to get pulled over for speeding and asked how fast was I going, I could have said, no clue, speedometers read high. Now I can't.....
