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Speedometer correction..

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Old 03-06-2008, 11:27 AM   #1
Bill in Ky [OP] Bill in Ky is offline
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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!
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Old 03-06-2008, 12:02 PM   #2
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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?
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Old 03-06-2008, 12:13 PM   #3
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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.
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Old 03-06-2008, 03:34 PM   #4
Bill in Ky [OP] Bill in Ky is offline
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Red face

You are right Phantom, thank you

I guess I thought 10% was easier to figure
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Old 03-06-2008, 04:45 PM   #5
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mine was 2 mph fast according to my gps. now that i have the larger tires, the speedo is dead on, but the odo is off now.
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Old 03-06-2008, 04:55 PM   #6
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Quote:
Originally Posted by Bill in Ky View Post
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!
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).
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Old 03-06-2008, 06:59 PM   #7
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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?
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Old 03-06-2008, 07:34 PM   #8
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Quote:
Originally Posted by TacoTurd View Post
The interesting part is your warranty will expire with less than 36,000 actual miles. Neat huh?
Never thought about that. Good point.
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Old 03-06-2008, 08:04 PM   #9
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on the other hand, put a nice set of 40 in. tires on it and you get a good sized extension on the warranty.
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