Correcting the speedometer

Reply Subscribe

Thread Tools

Search this Thread

Aug 29, 2018 | 03:19 PM

eyoung14

Thread Starter

New User

Joined: Dec 2017

Posts: 21

Likes: 0

Correcting the speedometer

For all of you guys with bigger tires. I just put 37's on my 6.7. How did you correct the speedometer. I have the ezlynk tuner but it only lets you go up to 34.5" tires. Any other way to do it?

Thanks

Aug 29, 2018 | 03:27 PM

Tricon

Logistics Pro

Joined: Apr 2017

Posts: 3,674

Likes: 51

From: SoCal

FORscan, search for the thread, there's a million posts about it.

Aug 29, 2018 | 03:35 PM

eyoung14

Thread Starter

New User

Joined: Dec 2017

Posts: 21

Likes: 0

Quote:

Originally Posted by Tricon

FORscan, search for the thread, there's a million posts about it.

It says that it will set of a CEL due to the difference in factory settings. Id like to not drive around with the light on all the time haha

Aug 29, 2018 | 03:41 PM

jonathanjr1

Senior User

Joined: Oct 2017

Posts: 152

Likes: 8

Quote:

Originally Posted by eyoung14

It says that it will set of a CEL due to the difference in factory settings. Id like to not drive around with the light on all the time haha

this thread has the way with no cel.
https://www.ford-trucks.com/forums/1540527-calibration-for-large-tires-with-forscan-no-cel.html

Aug 29, 2018 | 04:34 PM

Tricon

Logistics Pro

Joined: Apr 2017

Posts: 3,674

Likes: 51

From: SoCal

Keep reading, they figured out how to do it without the CEL.

Aug 29, 2018 | 04:52 PM

Dockmaster1

Senior User

Joined: Sep 2017

Posts: 118

Likes: 0

There is a whole thread about how to do this using gear ratio input to correct for tire size. This allows you to make the correction without getting the CEL. Trying to simply input anything larger than 35" tires apparently results in a CEL. I have not tried this yet but plan to in an effort to correct for my 37's.