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Old 08-15-2011, 07:48 PM
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Speedo not reading correctly! Need help.

Dont know if this is the right section but I have a question. I just bought a 03 f350 and the speedo is off a few mph. I have checked it with 2 different gps units. It has the factory tire size but the speedo reads slow. at highway speeds it is off as much as 6 mph. Around town its off about 2-3 mph.


Is this normal or what can I do?
Also how much is this affecting my mileage on the odometer?

Last edited by one5oh2nv; 08-15-2011 at 08:00 PM.
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Old 08-15-2011, 07:49 PM
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that title........




anyway

what tire size are you running?
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Old 08-15-2011, 07:53 PM
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265/75/16

Whats wrong with the title?
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Old 08-15-2011, 09:12 PM
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Quote:
Originally Posted by one5oh2nv View Post
265/75/16

Whats wrong with the title?
Lol nothing.


Stock size huh? Then someone musta change the computer tire cal.
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Old 08-18-2011, 12:20 AM
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Almost all speedos will be off from the factory. Most will read that your going faster then you really are. the speedo if im correct is controled by the ABS i know they make aftermarket modules to correct them for larger tires but i have never messed with them to see how they work.
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