[Chillis]

I don’t believe that’s correct… I haven’t seen a single person actually correct their speedo, much less without DTC errors. If you have please post a link

Which part is not believed to be correct?

Someone posted about the shop by Lake Tahoe that fixed their Speedo after the larger tires.

The dealer I'm visiting tomorrow seems confident about fixing mine.

 

[dhagberg]

waiting for news with anticipation...

 

[dinocarsfast]

I don’t believe that’s correct… I haven’t seen a single person actually correct their speedo, much less without DTC errors. If you have please post a link

I adjusted my Speedo for my winter tires, 225/75R16 but that’s only about a 6% adjustment.
As for my 245/75R16 AT tires I haven’t been able to find a way to adjust it that much.

 

[ArgonautVans]

Which part is not believed to be correct?

Someone posted about the shop by Lake Tahoe that fixed their Speedo after the larger tires.

The dealer I'm visiting tomorrow seems confident about fixing mine.

Someone posted? Link?

@dino - was that you? Did you make a post about it? What method did you use to adjust?

my speed naturally is fast it seems, with 245/75r16 tires it’s only 4mph slow at 70mph without doing anything. So my speedo was about 3% faster than actually with stock tires, now 6% slow with bigger ones. Not enough to really worry about, but it’d be nice to correct it.

My dashcam has gps speed which has proven very accurate.

 

[Chillis]

Someone posted? Link?

@dino - was that you? Did you make a post about it? What method did you use to adjust?

my speed naturally is fast it seems, with 245/75r16 tires it’s only 4mph slow at 70mph without doing anything. So my speedo was about 3% faster than actually with stock tires, now 6% slow with bigger ones. Not enough to really worry about, but it’d be nice to correct it.

My dashcam has gps speed which has proven very accurate.

Speedometer recalibration - it helped more than I expected!

So I took my van for an alignment check at the same shop who installed my lift kit and larger tires last year. The guy offered to adjust my speedometer with Ford Scan at the same time. I am really glad he did it! In addition to having a more proper readout, it seems like it helped with the...

www.fordtransitusaforum.com

 

[ArgonautVans]

Huh. That’s a first. I pass through Truckee all the time, maybe I’ll see if they can do mine sometime and watch what exactly they do. Encouraging at least that someone claims they’ve done it successfully

 

[dinocarsfast]

@dino - was that you? Did you make a post about it? What method did you use to adjust?

I did it a long time ago I cant remember the details but if I have time I'll look into what I changed, possibly the next couple of weeks when I'm back in the US

 

[Chillis]

I posted to the other thread that the dealer was not able to fix my 2018 speedometer even though they said they could repeatedly. Took up a few hours and more than a few gallons of fuel to fail.

I'll be pursuing the HP Tuner route.

 

[OldMadBrit]

It is now a known quantity that '20 and newer can have the tire diameter adjusted to correct the speedometer.

How has Quigley and Quadvan fixed theirs?

Mine with 31.7 or .8 tires is reading 12% lower than actual and I've regeared to 3.73:1. Not sure what size tires the 4wd conversions use but after spending that type of money I can't imagine it being acceptable to have a 12% error in speedometer and odometer.

They didn't, they supply vehicles with OEM tires, changing up is considered a user modification. My Quigley's ODO and Speedo has always been ~9% out.
Many of us have tried, and tried, and tried again to re-calibrate. Most dealers think they can - right up to where they fail. AFAIK the ODO and Speedo calibration is locked in every Transit.
I'm pretty sure it's because Transits are intended primarily for uses as commercial vehicles and there are even more serious restrictions on tampering with ODO and Speedo calibrations on commercial vehicles.
I suspect that just because Transit Trails are calibrated for 245/75 x 16 tires, it probably doesn't mean that their ODO and Speedo calibrations and those of '23 and up are not also locked.

 

[Chainman1]

Huh. That’s a first. I pass through Truckee all the time, maybe I’ll see if they can do mine sometime and watch what exactly they do. Encouraging at least that someone claims they’ve done it successfully

I went there with my 2016 and he couldn't do it. brought out all the expensive Snap On computers but no luck.
He said he had success with the post 2020 models, so hopefully he can calibrate yours

 

[istone]

I have access to a Transit Trail if there’s anything useful we can pull from it to correct this. Just bought the extended license for ForScan.

 

[asdrew]

I have access to a Transit Trail if there’s anything useful we can pull from it to correct this. Just bought the extended license for ForScan.

That would be great info to have!

 

[istone]

Just let me know what I need to grab from it.

 

[asdrew]

These are some of the settings I've experimented with:

 

[ArgonautVans]

I have an appointment with Sierra Adventure Vehicles in Tahoe next week, supposedly he says he can recalibrate my 2020 so we’ll see how it goes! I’ll have to try to ask him what exactly he’s doing

 

[Chillis]

The Ford dealer said they can change 2020 and newer models. It's us vintage owners that are not having the luck.

The guy that is supposed to help me tune mine has not been active for mine yet.

 

[ArgonautVans]

Well, unfortunately Sierra Adventure Vehicles was not able to recalibrate my Speedo on my 2020 AWD HR EXT Cargo van. He said the TCM programming seemed to take though, which should help shift points (preliminarily shifting seems a little better up and down, but it was pretty good before).

he’s not sure why some transits seem to take the programming and actually fix the speedo, and some don’t. Maybe passenger vans have worked better than cargo? Doesn’t appear he was keeping track. Said he Has hasn’t had any luck with 2023 vans either though, and it appears that 2020 vans have different bcm programming than 21 and 22. @syncocrock from the other thread also has a 2020 cargo van though so who knows.

 

[Chillis]

Well, unfortunately Sierra Adventure Vehicles was not able to recalibrate my Speedo on my 2020 AWD HR EXT Cargo van. He said the TCM programming seemed to take though, which should help shift points (preliminarily shifting seems a little better up and down, but it was pretty good before).

he’s not sure why some transits seem to take the programming and actually fix the speedo, and some don’t. Maybe passenger vans have worked better than cargo? Doesn’t appear he was keeping track. Said he Has hasn’t had any luck with 2023 vans either though, and it appears that 2020 vans have different bcm programming than 21 and 22. @syncocrock from the other thread also has a 2020 cargo van though so who knows.

Did you try the dealer?

 

[ArgonautVans]

No, and I’m not going to try. No one has definitively been successful with these vans, and I’m skeptical of claims otherwise

my guess is my post (#2 in this thread) is correct, and there is a max value that has to be changed, and Forscan is unable to. HP Tuners might be the answer. But it appears that didn’t fix your problem either, but maybe there’s more tinkering to be done with the HP Tuner.

From some quick google searching, you may need to get a HP Tuner to change the max tire size limit in the PCM

How to use FORScan to adjust tire size - Page 6 - FORScan forum

 

[tonymorr]

I have access to a Transit Trail if there’s anything useful we can pull from it to correct this. Just bought the extended license for ForScan.

Is the speedometer correct? My 2023 Trail reads 65mph when I'm actually doing 70. Dealer looked at it and confirmed. They are waiting for Ford to come up with something. The good news is that I can go ~ 87 mph actual