Speedo calibration - Ford Powerstroke Diesel Forum
 
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post #1 of 6 Old 01-10-2013, 05:25 AM Thread Starter
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Speedo calibration

Hello,

I'm having problems getting my speedo calibrated since going to 35's. I know it's done through the ABS system and you have to change the revs per mile reading. I have tried several places, two independent(both using Snap-on scanners), and one dealer. No one can get into the ABS system to change the reading. I personally know the people that have tried so I know they aren't just blowing me off.

It's not a huge deal, but it bugs me. It's 7.5% off as per GPS.
The truck is a 00' F-250 7.3(obviously) Auto trans. 4x4

Suggestions??
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post #2 of 6 Old 01-10-2013, 05:53 AM
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I thought it couldn't be calibrated on the 7.3's????

I just live with it being 2.5 MPH off.

Mitch

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post #3 of 6 Old 01-10-2013, 06:39 AM
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I did it to mine with the AutoEnginuity scanner. You don't get infinite choices, just select from a list to one that's closest to your tire. It made a difference, I'm now just like 2mph off at 40mph (according to those "radar signs").
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post #4 of 6 Old 01-10-2013, 06:58 AM
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Quote:
Originally Posted by NoRalPh View Post
I did it to mine with the AutoEnginuity scanner. You don't get infinite choices, just select from a list to one that's closest to your tire. It made a difference, I'm now just like 2mph off at 40mph (according to those "radar signs").
This. I did mine and a buddies with my AE scan tool. They are worth the money if you plan on keeping the truck for any amount of time.
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post #5 of 6 Old 01-10-2013, 02:21 PM
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Quote:
Originally Posted by NoRalPh View Post
I did it to mine with the AutoEnginuity scanner. You don't get infinite choices, just select from a list to one that's closest to your tire. It made a difference, I'm now just like 2mph off at 40mph (according to those "radar signs").
I did this to my ex, it was about 3 mph off. I had to fudge the numbers smaller than my actual tire size by a couple inches to get closer to accurate reading according to my gps.

SM


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post #6 of 6 Old 01-10-2013, 05:07 PM
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Get a speed wizard. Limitless calibration. Works wonderful and easy to adjust with a GPS.

Belz
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