Odometer accuracy - Ford Powerstroke Diesel Forum
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post #1 of 16 Old 11-22-2009, 08:28 PM Thread Starter
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Odometer accuracy

So, I know speedo is off by 10mph....do you think my odometer is off? I was next to my wife driving home in seperate cars and we clicked off a mile together. Once her Camry hit a mile my truck was at .09..... so I am guessing every 10 miles I go, I actually have gone 11.... so 100 miles I would have gone 110 and 200 is 220 and 300 is 330 and so on..... this must explain why I was thinking I should be getting more out of my 40 gallons then what the odometer was reading...thank god.... anybody have similar issues with thiers..

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post #2 of 16 Old 11-22-2009, 08:32 PM
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Yes it will be off. Mine is off, cant remember how bad though

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post #3 of 16 Old 11-23-2009, 12:13 AM
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mines off too. not sure how much. i have 315 tires (i think) and even with the sct rotations per mile thing, its still a little off

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post #4 of 16 Old 11-23-2009, 02:20 AM
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Everyone with over sized tirtes has this "issue". Mine was 7% off until I calibrated my odometer/speedometer with my AutoEnginuity scanner. Now it is dead on!

Before I knew I could do this I just compared my speed on the GPS with the speedometer and calculated the difference. Mine happened to be 7%. I would just add 7% to my miles logged before I divided by the gallons used. Now it is much better!

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post #5 of 16 Old 11-23-2009, 10:16 AM
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Quote:
Originally Posted by Hank View Post
Everyone with over sized tirtes has this "issue". Mine was 7% off until I calibrated my odometer/speedometer with my AutoEnginuity scanner. Now it is dead on!
OK silly question maybe but where in the heck is that option at? I've searched till I can't search no more and I havent found a place to recalibrate the speedo with my AE anywhere!

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post #6 of 16 Old 11-23-2009, 01:56 PM
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OK silly question maybe but where in the heck is that option at? I've searched till I can't search no more and I havent found a place to recalibrate the speedo with my AE anywhere!
PM sent. Call me tonight if you need to.

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(Late '99 Regular Cab Work Truck)


6.5" Pro Comp Lift ~ Traction Bars ~ Son-Built Sliders ~ 16" Pro Comp Xtreme Wheels with 35" BFG TA KM2s
4" Banks Exh.-Power Elbow ~ Wicked Wheel ~ DIY AMSOIL EaAU4090 Intake ~ PHP 6 Pos Chip ~ LowDown LED Upgrade
Stage 1 Injectors ~ HankDaddy Mod. ~ BUILT TRANNY! 352 HP Shootin' for 375!
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post #7 of 16 Old 11-23-2009, 02:03 PM
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Here it is for everyone:

In the Ford module, when you pick your model and year, you can go to the bottom where you pick "generic" or "enhanced", etc., you pick "anti-lock brakes" or something like that. Then when the program starts, you go over to the tabs on the right side where you can run a buzz test, etc., for the Powerstrokes and there will now be a pull down for "Tire Selection" or something like that. Each click of the "<" or ">" on the screen with the mouse (not the ones on your keyboard) will change your tire diameter by 1/2". I run 315 BFG ATs which are not a full 35" high. I put in 34.5" and my speedo is dead on with my GPS!

2001 F250 Lariat Crewcab, Automatic, 4X4

(Late '99 Regular Cab Work Truck)


6.5" Pro Comp Lift ~ Traction Bars ~ Son-Built Sliders ~ 16" Pro Comp Xtreme Wheels with 35" BFG TA KM2s
4" Banks Exh.-Power Elbow ~ Wicked Wheel ~ DIY AMSOIL EaAU4090 Intake ~ PHP 6 Pos Chip ~ LowDown LED Upgrade
Stage 1 Injectors ~ HankDaddy Mod. ~ BUILT TRANNY! 352 HP Shootin' for 375!
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post #8 of 16 Old 11-23-2009, 04:51 PM
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You da man Hank! Dont know how I missed that all these times but I sure managed it somehow.

Now if I could just get it to connect to my wife's truck like it used too....

David
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post #9 of 16 Old 11-23-2009, 05:03 PM
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Originally Posted by Davey~do View Post
You da man Hank! Dont know how I missed that all these times but I sure managed it somehow.

Now if I could just get it to connect to my wife's truck like it used too....
Glad it worked out! Someone showed me that trick a few weeks ago. Wish I had known about it 2 years ago!

2001 F250 Lariat Crewcab, Automatic, 4X4

(Late '99 Regular Cab Work Truck)


6.5" Pro Comp Lift ~ Traction Bars ~ Son-Built Sliders ~ 16" Pro Comp Xtreme Wheels with 35" BFG TA KM2s
4" Banks Exh.-Power Elbow ~ Wicked Wheel ~ DIY AMSOIL EaAU4090 Intake ~ PHP 6 Pos Chip ~ LowDown LED Upgrade
Stage 1 Injectors ~ HankDaddy Mod. ~ BUILT TRANNY! 352 HP Shootin' for 375!
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post #10 of 16 Old 11-24-2009, 03:35 PM
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3.5% off with my 35's.


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