Tire Size - Speedometer Calibration? - Ford Powerstroke Diesel Forum

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post #1 of 7 Old 08-26-2013, 12:43 PM Thread Starter
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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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post #2 of 7 Old 08-26-2013, 01:26 PM Thread Starter
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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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post #3 of 7 Old 08-26-2013, 06:46 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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post #4 of 7 Old 08-26-2013, 06:55 PM Thread Starter
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So the two Hypertech options don't work?
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post #5 of 7 Old 08-26-2013, 08:20 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

2011 F350 Lariat FX4, CCSB, 6.7, 3.55s, 325/65R18 Duratracs, Carli 4.5" Pintop, Flo-Pro, S&B intake, H&S w/ SPE tuning.
2011 Explorer Limited 4WD on 17x7.5s Core Racing Diablo 2s with 245/70R17 Duratracs
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post #6 of 7 Old 08-27-2013, 05:22 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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post #7 of 7 Old 08-27-2013, 06:26 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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