How to: Recalibrate Speedometer with Forscan for 2021 Bronco

[HypebeastDad]

https://tiresize.com/calculator/

This the same one I used.

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[HypebeastDad]

Tarikh, most 35s aren’t exactly 35.0” in diameter. For example, Sasquatch tires (LT315/70 R17) are 34.4” diameter, so the circumference for that tire would be 2741 mm. Not a big difference between 2741 and 2791, but it’s still smaller. So be sure to use your exact tire diameter, and not the nominal diameter marketed by the tire maker. Might as well be exact, if you can.

Source: 2021 Bronco Factory Tire Size & Wheel Size Comparisons (Circumference, Diameter, Height, Width, Bolt Pattern, Center Bore)

Thanks fam I’m going to check the manufacture I’m running ko2s. Glad to have you guys to run ideas by.

 

[Bronc-Itus]

Awesome thanks for sharing! If you get time can you check to see if there’s an option to enable a fog light button?

We found out the wiring is there for the fogs (even when they’re missing like on the mod bumper). If it can be enabled on Forscan then all that would be needed is a switch and some aftermarket lights

Don’t want to give the impression that this is my video. I’m not brave enough to try this myself at this point. I am just happy to see a shade tree up-fitter can accomplish this so easily. As far as the fog lights.... I would think forscan would be unnecessary. If wires are there I would think a simple switch to connect them should do the trick. But I’ve only worked on 80’s and 90’s vehicles.

 

[evilletruck]

My tires are 35/12.5R17 I got 2791 for the circumference. Am I right guys?
I’m going from base tires.

That’s what I started at , but after driving it it had went the other direction and speedometer said I was going faster than GPS.

Dialed it back a little at a time until I ended up at 2600mm which is less than actual tire circumference but what gets everything synced up.

 

[HypebeastDad]

That’s what I started at , but after driving it it had went the other direction and speedometer said I was going faster than GPS.

Dialed it back a little at a time until I ended up at 2600mm which is less than actual tire circumference but what gets everything synced up.

Thank you. I’m on YouTube thanking you also.

 

[Coloradonatives]

My forescan was deleted just after I was borned, y'all

 

[Bee Bop]

@Bronc-Itus unfortunately modern cars don't use the direct from switch to relay wiring like the old cars used to. Now everything is controlled by the computer. all turning on you headlight switch does is sends a command to the BCM which actually turns on the lights. It is the same with the windows and just about every other function. To add fogs using the factory headlight switch would require enabling that option using Forscan, the proper wiring being present in the harness, and the connection being present in the fuse block. Luckily we have the up-fitter switches that we can use.

 

[BaseBD]

@evilletruck did the step through to do this work smooth for you? Any other gremlins jump out during the process?

 

[JB’S BRONCO]

• 1

Just wondering if anybody has tried to calibrate there speedo with Forscan. I did mine and when I changed my tire circumference to proper size i went from reading under to over my actual speed and lost my cruise control. I have the 2.3L with a manual transmission so I’m just wondering if anyone has a solution for this.

 

[evilletruck]

• 1

Just wondering if anybody has tried to calibrate there speedo with Forscan. I did mine and when I changed my tire circumference to proper size i went from reading under to over my actual speed and lost my cruise control. I have the 2.3L with a manual transmission so I’m just wondering if anyone has a solution for this.

Same happened to me, had to dial the number back incrementally ( did @ 100 mm ) each time until it all synced up, started at 2792 went to 2691, and then 2600 which was right on.

 

[evilletruck]

@evilletruck did the step through to do this work smooth for you? Any other gremlins jump out during the process?

Went smoothly did get some codes but once I ran PCM and AWD relearn and cleared DTC. they stayed away.

 

[Broncolli]

• 1

Just wondering if anybody has tried to calibrate there speedo with Forscan. I did mine and when I changed my tire circumference to proper size i went from reading under to over my actual speed and lost my cruise control. I have the 2.3L with a manual transmission so I’m just wondering if anyone has a solution for this.

I always had a question about this - how does cruise control work with a manual ? If you are in 6th going 55 on the highway using Cruise control - and suddenly traffic slows to 40, I guess you are responsible for downshifting - but what happens if you have ACC ? I guess ACC does not exist for manuals ?

 

[JB’S BRONCO]

Same happened to me, had to dial the number back incrementally ( did @ 100 mm ) each time until it all synced up, started at 2792 went to 2691, and then 2600 which was right on.

Aft

Same happened to me, had to dial the number back incrementally ( did @ 100 mm ) each time until it all synced up, started at 2792 went to 2691, and then 2600 which was right on.

After you found the right number was your cruise still working fine or did you have to do anything else.

 

[evilletruck]

Aft

After you found the right number was your cruise still working fine or did you have to do anything else.

It's been working fine, didn't try it at all as I was adjusting it, but since its been set I haven't had any issues.

 

[Contact]

Just curious about the video as far as the original tire size he had for the 265/70r17s. It showed 2440 as the circ. I use the tire size calc and it shows 2520 to be the correct setting for these tires. I wonder why the initial setting was so different.

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