Can dealerships calibrate speedo yet?

[iwantabasebronco]

I’m wondering if anyone has had their dealership update their speedo for larger tires yet? When I got larger tires two years ago they didn’t have that capability yet, so I just used forscan. Thinking of going even larger and would prefer to have dealer update speedo rather using forscan (and not pay for that for performance ECU tool).

Thanks!

Sponsored

 

[Ducati1098]

No, and they never will be able to again most likely. Ford took that away a while ago.

 

[RagnarKon]

No, and they never will be able to again most likely. Ford took that away a while ago.

Random side question:

Did they take it out of IDS too? Someone at work is working on an old Ranger/F-150 frankenbuild project and wanted help, but if you can’t do it IDS either that changes things…

 

[Ducati1098]

Random side question:

Did they take it out of IDS too? Someone at work is working on an old Ranger/F-150 frankenbuild project and wanted help, but if you can’t do it IDS either that changes things…

I believe so. I haven’t personally looked for it in IDS for a while, but I do remember someone mentioning to me that it was no longer there either. I can check tomorrow though.

 

[RagnarKon]

I believe so. I haven’t personally looked for it in IDS for a while, but I do remember someone mentioning to me that it was no longer there either.

My only question is “why, Ford, why do this?”.

 

[Ducati1098]

My only question is “why, Ford, why do this?”.

Yeah it’s stupid. Especially when they’re making off road vehicles and know their customer base is going to be changing tire sizes.
I’ve got to assume there was a reasoning behind it though. They may have had their hands tied due to some type of regulation or something, who knows

 

[Brian_B]

My only question is “why, Ford, why do this?”.

Liability I’m sure.

“Did you know you were going 15 over the speed limit?”

“Really!? I had no idea - my speedometer read exactly at the speed limit and I just had it calibrated by the dealer after they installed these awesome tires!”

It did get me out a ticket the week after I picked up my Bronco… so it does work, at least in limited circumstances

 

[NYtoCALI]

Saw the thread, and had to ask.

Revolution question without having to recalibrate.
255 series on OB is 629 revs. Looking to put wider tires on…..revs could be up to 10 revs +\- either way. At what point would I notice speedometer off dramatically?
I deal with 4 x 4 and 6 x 6 class 7/8 trucks knowing that 5 to 8 revs either way is acceptable by Engineering. Sometimes you just can’t match it up. Just curious what the experience of has been with Broncos.

 

[Twister22]

Mine is off like 5 mph. I can live with that, not a big deal!!

 

[RobWTX]

Mine is off like 5 mph. I can live with that, not a big deal!!

Depends which way it is off. You may be getting more miles on the Bronco than driven (or opposite, and fewer than driven ).

 

[BadlandsA51]

I’m wondering if anyone has had their dealership update their speedo for larger tires yet? When I got larger tires two years ago they didn’t have that capability yet, so I just used forscan. Thinking of going even larger and would prefer to have dealer update speedo rather using forscan (and not pay for that for performance ECU tool).

Thanks!

It’s actually illegal to do that. Ford scan tools no longer have the option to change tire size or gear ratios. I think the Ford Racing tuner may be able to do it, but comes with the “Off Road Use Only” disclaimer. Forscan can do it without much trouble.

 

[BadlandsA51]

My only question is “why, Ford, why do this?”.

EPA regulations, we’re no longer able to legally do anything that changes the original build “calibration “ for emissions and fuel economy ratings reasons.

 

[Twister22]

Depends which way it is off. You may be getting more miles on the Bronco than driven (or opposite, and fewer than driven ).

I guess I'm good then! It will read fewer miles!!

 

[Beach_Bum]

Saw the thread, and had to ask.

Revolution question without having to recalibrate.
255 series on OB is 629 revs. Looking to put wider tires on…..revs could be up to 10 revs +\- either way. At what point would I notice speedometer off dramatically?
I deal with 4 x 4 and 6 x 6 class 7/8 trucks knowing that 5 to 8 revs either way is acceptable by Engineering. Sometimes you just can’t match it up. Just curious what the experience of has been with Broncos.

The difference in revolutions affecting the speedometer is greater the faster you go. Something that is only 10 revs off (+/-) will be negligible. You can plug in tire comparisons at Tire Size Calculator.

As an example, take the scenario that an OBX (255/70R18) swaps wheels/tires with a Black Diamond (265/70R17). Two wheels/tires that are very similar but highlights the revolution discrepancy which is +9/mile. At 50mph reading, the actual speed is 49.2mph. At 70mph reading, the actual speed is 68.8mph.

 

[ksdon]

@BadlandsA51 Our dealer said it's EPA emissions rules so thay can't touch it.

Sponsored