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Speedometer correction with tuner / programmer?

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Can a tuner calibrate for changing tire sizes? I'm used to obd1 cars.
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L8apex

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A tuner should definitely be able to. But I'm hoping someone that has Mike Levine's ear on twitter can ask if this feature is available through the cluster?
 

Rick Astley

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Can a tuner calibrate for changing tire sizes? I'm used to obd1 cars.
My understanding is that with speed sensors on the hub instead of rotating mass, that modern cars are self-correcting ECU's now. There are too many other metrics that rely on vehicle speed such as stability control to have to manually adjust them anymore.

You kids and your fancy OBDI! I have to have speedo gears made for the transmission housing to get my classics adjusted for different wheel sizes. (Ultimately that being a waste of time, I just eyeball it or disconnect the speedo entirely)
 

Spooled

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Making it adjustable on the dash would be a liability issue.

Now if they could somehow tie it to GPS and auto correct the speedometer that way... that would be cool.
 

HoosierDaddy

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Third thread, same question.

Ford systems the I am familiar with derive the vehicle speed from the braking system, which monitors the tires rotation all the time. The computer needs to know how many "Revolutions per Mile" the tire has/ It is listed under the specs for any given tire size. Check the manufactirers web site.
In the ABS system , there is an parameter that can be changed for the tires RPM(mile).
Ford techs can do it in a few minutes.
I have no idea about tuners etc.
 

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rtaylor

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Can a tuner calibrate for changing tire sizes? I'm used to obd1 cars.
Yes. If you order a custom tune, you can specify the diff ratio and tire size. Generic tuner products usually support this as well. You can also take it to a Ford dealer and have them change it (for a fee).
 

Austin26

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Has any new information come out since this thread was active? I may change the tires and gear ratio and would like advice on how best to go about recalibrating the speedometer. I'm also not planning on getting a performance tune for what it's worth.
 

ZackDanger

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Has any new information come out since this thread was active? I may change the tires and gear ratio and would like advice on how best to go about recalibrating the speedometer. I'm also not planning on getting a performance tune for what it's worth.
There should absolutely be a field within the ecu to tell the computer what diff gearing and tire size is on the vehicle.

In the very least, I would think a Ford dealer could adjust it for you if an aftermarket device isn’t available by that time.

https://performanceparts.ford.com/part/M-12655-F
 

Austin26

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There should absolutely be a field within the ecu to tell the computer what diff gearing and tire size is on the vehicle.

In the very least, I would think a Ford dealer could adjust it for you if an aftermarket device isn’t available by that time.

https://performanceparts.ford.com/part/M-12655-F
Yikes, that's $450. May as well buy a performance tune if that was the case! Thank you for the reply. So no matter what it'll be expensive to recalibrate?
 

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ZackDanger

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Yikes, that's $450. May as well buy a performance tune if that was the case! Thank you for the reply. So no matter what it'll be expensive to recalibrate?
No, that’s the dealer tool to do multiple vehicles. I only shared the link to show that they *do* have the capacity to edit those parameters in your car.

Paying a dealer to do it would probably be maybe an hour of shop time, tops.

On the Jeep side you can buy a small “tuner” for under <$200 that lets you edit all those things as well as change throttle response, comfort settings, TPMS, etc. You usually buy a license which is locked to a VIN, so a single car unit is relatively inexpensive (compared to the linked device which is unlimited vehicles).

I imagine people will be working hark to get something like that up and running (ForSCAN) but our Bronco’s will be Sync4... so I presume there may be some time before it gets sorted.

Here are these:

https://superchips.com/ford-f-150-performance-tuner-intake-exhaust/
 

Blksn955.o

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I run a TweeceR/T in the 94 mustang. It is ODB1 and ancient compared to modern eec's. Odb1 still had a gear in the trans to account for the speedo but the gen after mine (96-98) started using an electronic setup some would buy a speed cal. others a tune. So for the last 20+ years it has been done via computer.

Weather that signal is from an abs pickup or something else the eec probably still has its hands in it and can me adjusted to account for tires and gear changes beyond a certain margin. That is one reason I really hope Ford offers a factory tune with their handheld tuner/reader. You should be able to account for tires and gears as well as reset codes and scan for those codes on top of installing your factory blessed performance tune.
 

XCR440

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With the new SYNC4 there are a lot of questions about what the aftermarket will be able to do with PCM tuning. Time will tell, my bet is they'll be able to crack it, but since its "connected" Ford will know right away if you have a tune installed so warranty's likely to become more difficult.

That said, I'm betting that for just tire size the dealer will be able to change it. We can now on current vehicles using IDS so I'm betting that option remains.
 

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Thank you @ZackDange and others. I was going to be surprised if it was more than $100-$150 as I bought a primitive speed calibrator for my 2000 Mustang that worked well for $150-$200 and that was 20 years ago.

Cars have changed a lot over the past 20 years. I feel old saying that but it's true.
 

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I use an SCT X4 tuner with a 93 Octane Performance tune from 5startuning.com for my 3.5 Ecoboost. The SCT X4 tuner can change a ton of things through the OBD port. You can calibrate the speedo, tire size, account for bolt-on upgrades (though you really should send these types of upgrades to your tuner so they can account for it when they are designing your custom tune), plus a ton more. You're still looking at $400 though for the programmer. Like Zack said, you can go to a dealership and they can recalibrate the speedo for you for probably $75 max (I would hope anyway).
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