Speedometer correction..

In 2 miles of driving my odometer will gain 1/10 of a mile. Am I
correct in saying that my speedometer and odometer are 5% fast. If so if my speedometer says 50 I am actually doing 55, if it says 100 I am doing 110. Correct me if I am wrong.
Can a dealer correct the speedometer?
Thanks guys!

 

My speedo (in dash) reads 2mph fast according to my GPS. With the Scangauge II hooked up, it's actually accurate to the GPS. So - the dash output is calibrated slightly off.

I did a slow test mile and I think I was .02 mile off in one mile. Again - comparing my trip odometer with the GPS.

Not sure about the dealer making corrections - have you called them to ask?

You can make changes if you have a Scangauge II, but I'm not sure if that's only a 'Scangauge output' or if it changes the readings in the actual calculations within the computer. ???

Anyone?

 

Correcting through the Scangauge only corrects the scangauge. It has no controll over the output to the dash. However, if you are running a scangauge you still need to correct the speedo as it uses that data in some of it's other calculations.

My speedometer was dead on according to my GPS, and after I corrected the Scangauge all three devices (dash, Scangauge, and GPS) agreed.

 

You are right Phantom, thank you

I guess I thought 10% was easier to figure

 

If you odometer is saying you went 2.1 miles when you actually went 2 miles, then the speedometer is indicating you're going faster than you really are; when it says 55 you're only going 52.75 (55-5%). If it says 100, you're actually going 95.

rate = time * distance

If the distance is indicating too far (it shows 2.1 when it should show 2.0), the rate must be indicating too high (indicating 55 when it should indicate 52.75).

 

Johnson beat me to it. Yer arithmetic was bassackwards.

The interesting part is your warranty will expire with less than 36,000 actual miles. Neat huh?

 

Never thought about that. Good point.

 

on the other hand, put a nice set of 40 in. tires on it and you get a good sized extension on the warranty.