Odometer Accuracy?

[Rogue]

Today (Sat.) I went to the Tennessee Aquarium...a good 100 mile drive from where I live. (I saw a blue MP3 on I-75 SB, about 1:30...and of you?) On the way back I was checking my odometer against the mile markers. I was doing about 80-85 mph and I noticed that my odometer was changing faster than the markers.

I had it on TRIP A, which gives reads to the 10th of a mile. When I first watched it, the mile marker would come up right at xxx.9. Then after a while, it marker would come up at xxx.0. Even further down it started coming up at xxx.1.

I thought it may be because I was in the fast lane and the markers are measured off on the right side, so I moved over to the 'slow' lane...and still the odomoeter was rolling faster than the markers where coming.

C&D had an article about speedometer accuracies. That's what got me thinking about it.

Anyway...ya'll may want to check yours...

 

[Sir Nuke]

this brings up another question.....that goes hand in hand with this....

tire sizes...between the MP3, the P-5, and the MSP...

well the mp3s were/are stock at 205/45/17....which are 24.3 inches in diameter...

the p-5's are 195/50/16's which are 23.7 inches in diameter....

and the MSPs are 215/45/17....which are 24.6 inches in diameter....


HMMMMM.....do all three cars have the same guage cluster? or are they calibrated differently and just LOOK the same?

makes you wonder......

 

[Gyre]

A friend of mine has done some work on his Ford Thunderbird including tire and final gear ratio changes. On the Thunderbird, at least, there is some fine tuning that can be done on the speedometer. I hope that is synchronized with the odometer. When he did the final gear ratio change, he had to replace a gear or two for the change.