SCTx3 Adjusting Options for Bigger Tires - Ford Powerstroke Diesel Forum
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Old 12-26-2011, 06:16 PM
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SCTx3 Adjusting Options for Bigger Tires

What is the best way to adjust the options on my X3 to adjust for my 35" tires. I am starting to get sick of my spedo being so far off.

Thanks guys!
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Old 12-26-2011, 06:50 PM
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I think the settings on the X3 are just to get the tuner to adjust to work right. It won't change your speedo though.
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Old 12-27-2011, 05:35 AM
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Adjusts are for tranny shifting not the speedo.
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Old 12-27-2011, 08:56 AM
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Autoenginuity, Superlift Truspeed, or Ford I think are your only fixes for that.
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Old 12-27-2011, 10:15 AM
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Quote:
Originally Posted by HeavyAssault View Post
Adjusts are for tranny shifting not the speedo.
My SF3 will allow for me to adjust the Tire Size. This is something that only works on the 2005-2007 models with the updated software. I run 34.5's and it allowed me to set it and my speedo is dead on now.
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Old 12-27-2011, 01:00 PM
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Quote:
Originally Posted by MPTonyT View Post
My SF3 will allow for me to adjust the Tire Size. This is something that only works on the 2005-2007 models with the updated software. I run 34.5's and it allowed me to set it and my speedo is dead on now.
That's what I thought. I was going crazy with trying to remember why I thought this was possible. And looking at their software, I see there is an update than can be loaded. I wasnt going to deal with it but the tires measure over 35". It's significant to me!


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Old 12-27-2011, 01:13 PM
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Get your custom tuning person to fix it. I dont think the X3 has the capability. From what I understand the SF3 has the option built into the tuner and the X3 does not. But I think if you contact the person you got custom tunes from they can add that to your custom tune file.
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Old 12-27-2011, 10:27 PM
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both the x3 and sf3 allow you to adjust tires down to 600 rev/mile to adjust your speedo
it is only for the 05+ up trucks and you need to be at the latest firmware
of course with my 40's it still doesnt 'correct' mine all the way
i need 535 revs/mile
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