Hello fellow Ford enthusiasts,

I’m looking for an advice for my speedometer issue…

I have a 2016 F150 2.7 ecoboost 4x4 and I have put bigger tires (275/70r18) on it. Now my speedometer is reading incorrectly. Is off by 1-3mph depending on speed. I know it doesn’t sound a lot but I would like to have accurate readings. I called bunch of dealers in my area and no one can adjust the reading. I bought a Rough Country speedometer calibrator (SKU#90020) and it won’t work with my truck. Called 4wheelparts store and they told me that for my year/engine size the speedometer can’t be adjusted through the computer.

How can I go about getting it correctly adjusted? I was thinking about going to a speed shop and getting done there…

Thank you for the advices!

 

Check out the Forscan sticky. You will be able to adjust for tire size and a hole lot more for under $50 bucks

 

If you're just wanting to affect the speedometer then just change the tire size in the BdyCM in Rows 59-63 here: https://docs.google.com/spreadsheets...730/edit#gid=0

After making the change then run a PCM relearn in the programming screen of FORScan (should be the first option at the top in the programming area).

That's from Livnitup - pretty much the guru on Forscan. If I were you, I'd invest in an adapter and get Forscan. It's scary at first but then you realize that there are a TON of things you can do for your $30 investment. Double-honk, speedo, lighting, etc. I just adjusted mine to reflect my move to 22's and it's spot on.

 

Thank you for the information!

 

Why did you replace with larger tires in the first place? Your speedo is off 5% if your OEM tires were 265/65/18 or +2.5 MPH at 50 MPH..