speedometer calibration

hudu · Apr 11, 2015

I've got a 11 job 1,it came with 18" wheels,I put 20" wheels on. I need to calabrate the speedo,I searched and no results,any help would be apreceated

josh@thedieselcartel · Apr 11, 2015

Dealer should be able to do that for you as long as they are factory size tires.

You can only adjust these trucks up to 34.1 inches.

charles henson · Apr 11, 2015

The dealer cant/wont tune ove a 34" or no one will,i have a set of 35"toyo M /T's on the way & need to correct mine as well,but i also have a tuner coming,i see folks with more then 34's quite often.
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josh@thedieselcartel · Apr 11, 2015

charles henson said:
The dealer cant/wont tune ove a 34" or no one will,i have a set of 35"toyo M /T's on the way & need to correct mine as well,but i also have a tuner coming,i see folks with more then 34's quite often.
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You can run any size tire but the dealer, as well as aftermarket tuners can not compensate for anything larger than 34" in the speedometer.

Raptorgabe · Apr 11, 2015

I have a mini maxx and set at 34.1 and when my speedo is at 80 im actually only going 78 or so

charles henson · Apr 12, 2015

Thx raptorgabe,appreciate the input,that doesn't sound to bad,may actually help keep me out of trouble lol.

CurtisF · Apr 12, 2015

hudu said:
I've got a 11 job 1,it came with 18" wheels,I put 20" wheels on. I need to calabrate the speedo,I searched and no results,any help would be apreceated

Why do you have to calibrate for wheels? :look around:

Have you compared the tire sizes to see if you actually need to change anything?

Jassman · Apr 12, 2015

Here is what I use to re-calibrate tire size..the 20 is the size that comes from the factory..not sure on the 18...but see the speedo difference on far right.

http://tire-size-conversion.com/tire-size-comparison/

Ford can not adjust above the largest tire size..so the 34.1 is the largest.
I used this on my 15...
http://www.autoanything.com/performance-chips/61A3757A0A0.aspx

if you hold out you will be able to get it around 179.00 after they know you are looking for it... It will not be accurate until you mearsure the new tire on level ground and use that figure. I had 34.1.. 20's..and went to 37x12.5x20...After measuring vs using 37" and on the 3rd time finally figured out what I was doing wrong.. I used 35.75" after compression at the outside edge and she is accurate. This will save you many steps. Good Luck.

Arconalloy · Apr 12, 2015

I've never heard of anyone having to adjust for only stepping up in rim size I mean I've been wrong before but… lol

DSL_PWR · Apr 12, 2015

Hyper tech has a speedometer calibrator

CUZICAN · Apr 12, 2015

Jassman said:
Here is what I use to re-calibrate tire size..the 20 is the size that comes from the factory..not sure on the 18...but see the speedo difference on far right.

http://tire-size-conversion.com/tire-size-comparison/

Ford can not adjust above the largest tire size..so the 34.1 is the largest.
I used this on my 15...
http://www.autoanything.com/performance-chips/61A3757A0A0.aspx

if you hold out you will be able to get it around 179.00 after they know you are looking for it... It will not be accurate until you mearsure the new tire on level ground and use that figure. I had 34.1.. 20's..and went to 37x12.5x20...After measuring vs using 37" and on the 3rd time finally figured out what I was doing wrong.. I used 35.75" after compression at the outside edge and she is accurate. This will save you many steps. Good Luck.

The link is showing 2 options, one for an in-line module, and one that plugs into the obd port, which did you use?

gfulton · Apr 12, 2015

Wheel size doesn't make any difference it's tire size that does....lol

psduser1 · Apr 12, 2015

gfulton said:
Wheel size doesn't make any difference it's tire size that does....lol

*overall tire size* top of tire to the ground, mounted on the truck, to be clear

hudu · Apr 12, 2015

the wheels and tires were off a platinum so I thought there might be a factory setting I could access. I have 17" winter tires so I was hoping I could switch easily myself. I have a mini-max , just have to figure out how to use it.

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Jassman · Apr 13, 2015

CUZICAN said:
The link is showing 2 options, one for an in-line module, and one that plugs into the obd port, which did you use?

The one that plugs in and stays in behind the dash.

ftast350 · Apr 14, 2015

hudu said:
I've got a 11 job 1,it came with 18" wheels,I put 20" wheels on. I need to calabrate the speedo,I searched and no results,any help would be apreceated

You will only require a recalibration if you change the height of the tires (ex. from 33" to 35") if you change your rim size and purchase tires that are the same size as stock but with a larger or smaller rim diameter you will not have to re-cal.

Forget about the rim size, what is the tire size? If they are stock size tires on platinum rims then you do not need a re-cal. 17" 18" 20" 22" 24" all these rim sizes dont matter to the computer as long as the physical height of the tire is unchanged.

Ford Junky · Apr 20, 2015

Will the Hypertech unit correct for the screwed up GPS after I put my 3rd on today?

cbf9703 · Apr 21, 2015

Ford Junky said:
Will the Hypertech unit correct for the screwed up GPS after I put my 3rd on today?

What?

throttlejocky316 · Apr 21, 2015

I got the in-line speedo module plugged in behind my dash. I left the usb cable plugged into it and ran the excess cable to the bottom of my dash. I can now just plug in my laptop and make corrections to fine tune my speedo without having to take the dash apart.