tire size calibration
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Mountain Pass
Joined: Feb 2002
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From: Canada
tire size calibration
Waiting on my 2012 S-crew ecoboost 4x4 which will have a levelling kit and larger tires (approx. 33"). Can the dealership re-program the speedo/odometer for the larger tire size? Dealer doesn't think so but I'm surprised with all the technological capabilities they have. Anyone have any experience with this?
Pilgrim
Pilgrim
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Joined: Nov 2009
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From: NC
The dealer's ability (or lack of) to re-program the PCM for the larger tires depends on what factory tire sizes were available for the VIN. If the factory didn't offer 33" tires, then no. If they did, then yes.
Senior User
Joined: Oct 2010
Posts: 131
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From: Great Falls, MT. USA
Ditto.
On my truck (2011 F150), the factory size was 275/65R/18......I replaced them with 275/70R/18s.....and the dealership COULD NOT reprogram for the tires because they were not a "factory" size. It messed enough with my truck that I purchased another set of tires in the original factory size.
I would highly encourage you to speak with your dealer's service manager BEFORE you do ANY mods....no matter how simply they seem. These trucks are very sensitive to changes, and sometime what might seem very minor, will grossly impact the truck.
Just a word of caution for somebody who's already learned the hard way.
On my truck (2011 F150), the factory size was 275/65R/18......I replaced them with 275/70R/18s.....and the dealership COULD NOT reprogram for the tires because they were not a "factory" size. It messed enough with my truck that I purchased another set of tires in the original factory size.
I would highly encourage you to speak with your dealer's service manager BEFORE you do ANY mods....no matter how simply they seem. These trucks are very sensitive to changes, and sometime what might seem very minor, will grossly impact the truck.
Just a word of caution for somebody who's already learned the hard way.
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Mountain Pass
Joined: Feb 2002
Posts: 229
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From: Canada
Thanks for all the input.
Pilgrim
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Joined: Nov 2009
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From: NC
Without reprogramming the PCM, the larger diameter tire is going to affect your truck's performance by 'messing with' your shift points, even if they weigh exactly the same as the stock tires.
I can't confirm this with the 2012s (larger tires did affect the 2009s and 2010s), but they might also mess with your traction control system.
I can't confirm this with the 2012s (larger tires did affect the 2009s and 2010s), but they might also mess with your traction control system.
Postmaster
Joined: Jul 2008
Posts: 2,565
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If the tire size is much different than what the PCM is programmed for, it definately will mess with traction control and most other things controlled by the PCM. It can also cause premature transmission failure due to excessive heat. When increasing the tire size by an inch or more, you need to change gear ratios to keep the engine in its proper power band. Otherwise, you'll make your truck a real slug.
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