Speedometer Calibration With Larger / Bigger Tires?

[MattH88]

I've seen this tossed around before on the boards, but haven't actually seen if anyone has had their speedometer re-calibrated after getting some bigger shoes.

If you've done it, would you mind explaining how that process went for you? Service dept out here closed on Sunday, so I'm hoping one of you can share some wisdom on whether or not it's a quick/easy fix. Thanks!

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[Zolutar]

to recalibrate, it would have to be done at the dealer at this point.
Forscan has not cracked the BdyCM Central configuration yet, once they do, it can be DIY.

 

[DakotaTimber]

to recalibrate, it would have to be done at the dealer at this point.
Forscan has not cracked the BdyCM Central configuration yet, once they do, it can be DIY.

I doubt they will let that get cracked for DIY. Basically it lets you alter the miles on the car you get a marked title.

 

[Zolutar]

I doubt they will let that get cracked for DIY. Basically it lets you alter the miles on the car you get a marked title.

Well, it is a configurable option for other Ford models, and thus likely, but will be awhile

 

[MattH88]

to recalibrate, it would have to be done at the dealer at this point.
Forscan has not cracked the BdyCM Central configuration yet, once they do, it can be DIY.

My dealer actually said they couldn’t do it, and referred me to a commercial spot.

 

[Central Jersey]

My dealer actually said they couldn’t do it, and referred me to a commercial spot.

Mine said Ford does not allow it.

 

[Zolutar]

I can see where abuse of this setting could lead to fraud and thus not something Ford would admit to being able to do.

 

[Mike_L]

What about a separate module? When I increased tire size on my Taco, the Toyota Custom Shop installed a separate module to correct the speedometer.

 

[Osco]

From 225 65R17 to my new 235 65R17 per calculators I found through google at exactly 60 mph on the 225 I’ll be doing 61.1 on the 235. I looked up the 245 65R17 and it was I think 61.7 mph..
Not enough to worry with.
These small increases won’t mess up suspension geometry or cause antilock braking timing problems.
And should not increase strain on the suspension or throw off transmission gear ratios enough to cause problems.
I’m only going up to 235 because I’ve got the 1.5L engine and I don’t want to give up any acceleration rates from a stop.
I think my small increase adds 4 pounds to each tire as it is.
So 4 pounds each tire x 4
16 pounds of additional rotational mass has the same effect on acceleration and deceleration as 32 pounds of static ( unsprung ) mass.
https://www.broncosportforum.com/forum/threads/yokohama-geolandar-a-t-g015.4229/post-72625

 

[rdc17]

I'm going to give this a try this weekend

How to use FORScan to adjust tire size - FORScan forum

 

[rdc17]

I'm going to give this a try this weekend

How to use FORScan to adjust tire size - FORScan forum

Getting this gain security access failed message whenever I try writing the change to the BCM

 

[E229Lt]

It was easy on my '69 Olds.

 

[rdc17]

Has anyone tried this with Forscan 2.4.4 beta?

 

[Rgill]

From 225 65R17 to my new 235 65R17 per calculators I found through google at exactly 60 mph on the 225 I’ll be doing 61.1 on the 235. I looked up the 245 65R17 and it was I think 61.7 mph..
Not enough to worry with.
These small increases won’t mess up suspension geometry or cause antilock braking timing problems.
And should not increase strain on the suspension or throw off transmission gear ratios enough to cause problems.
I’m only going up to 235 because I’ve got the 1.5L engine and I don’t want to give up any acceleration rates from a stop.
I think my small increase adds 4 pounds to each tire as it is.
So 4 pounds each tire x 4
16 pounds of additional rotational mass has the same effect on acceleration and deceleration as 32 pounds of static ( unsprung ) mass.
https://www.broncosportforum.com/forum/threads/yokohama-geolandar-a-t-g015.4229/post-72625

Have you thought about teaching math, physics or engineering?

 

[RSH]

I'm running 245/65/17 tires on my Badlands, the speedo is off a couple mph, not a big deal.

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