Tire Size - Speedometer Calibration? - Ford Powerstroke Diesel Forum
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Old 08-26-2013, 01:43 PM
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Tire Size - Speedometer Calibration?

What devices out there will recalibrate the speedo of my 2012 F250 after adding a 35" tire?
I am not opposed to a tuner/programmer as well, but the speedo function is #1.

I see the Hypertech unit, but it only advertises correcting up to a 33" tire. The stock tire is more like 34".
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Old 08-26-2013, 02:26 PM
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Ok, leaning more toward NO tuning function. I'm really just not sure I want to risk effing up this truck for more power I can't say that I need.

Thinking about looking deeper into the Hypertech Speedo Calibrator.
Speedometer Calibrator - Hypertech
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Old 08-26-2013, 07:46 PM
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there is nothing out that works fords are to complex speed sensors go through the body control module. that includes the abs,traction control, navigation and hill decent.
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Old 08-26-2013, 07:55 PM
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So the two Hypertech options don't work?
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Old 08-26-2013, 09:20 PM
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I went from 275/70r18s(33.2" tall) to 325/65r18s (34.6" tall) and my speedo is only out by about half a mph without adjustment. There is a guy on here, cant remember his name, has 38" tires and a hypertech in-line module and he says his speedo is correct
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Old 08-27-2013, 06:22 AM
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The Hypertech does work. I have one and it works fine. The install and programming is pretty easy to do too. I would recommend it to you.
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Old 08-27-2013, 07:26 AM
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Ok I just got off the phone with hypertech was told buy tech support that it will not work on a 2013 sd but its in the works. 2013 is different than the 2012
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