Setting arbitrary tire sizes for speedometer calibration

Testing new functions
litian520
Posts: 4
Joined: Tue Sep 03, 2019 5:23 pm
Vehicle: EcoBoost2.0T/204ps

Re: Setting arbitrary tire sizes for speedometer calibration

Post by litian520 » Fri Oct 11, 2019 1:40 am

very good

Vale5799
Posts: 1
Joined: Sat Jul 13, 2019 10:53 pm
Vehicle: F150 5.0/2019

Re: Setting arbitrary tire sizes for speedometer calibration

Post by Vale5799 » Sun Oct 27, 2019 10:52 pm

I am trying to correct the speedo on my 2019 F150 5.0. I have changed the rims and tyres but apart from being wider they are equal the the factory size (orignals 275/55/20 now 305/55/20). I used the settings from the calculator spread sheet but I still have an error. Any suggestions on how to resolve this? Thanks

Dordogne
Posts: 15
Joined: Fri Aug 12, 2016 6:21 pm
Vehicle: Mustang 5.0 2017

Re: Setting arbitrary tire sizes for speedometer calibration

Post by Dordogne » Sun Oct 27, 2019 10:59 pm

What do you mean by “error” - like a DTC or a speedo error?

Djack
Posts: 2
Joined: Wed Nov 13, 2019 11:29 pm
Vehicle: 2012 F250 Super Duty 6.2L gas

Re: Setting arbitrary tire sizes for speedometer calibration

Post by Djack » Sat Nov 16, 2019 6:41 pm

Trying to calibrate speedometer on 2012 F250. Not sure what block to program into. Any help would be greatly appreciated!

lenko
Posts: 238
Joined: Sat Dec 24, 2016 6:40 pm
Vehicle: 2015 Lincoln MKC, 2006 Mustang GT, Saleen 530 HP

Re: Setting arbitrary tire sizes for speedometer calibration

Post by lenko » Sun Nov 17, 2019 3:51 pm

Djack wrote:
Sat Nov 16, 2019 6:41 pm
Trying to calibrate speedometer on 2012 F250. Not sure what block to program into. Any help would be greatly appreciated!
Could be the middle 4 numbers of 726-45-01 (BCM). Just checked Grandson's 2012 Ford F 150 and his 726-45-1 is xxxx 0988 xxxx, which shows the 0988 definitely denotes his tire size and this is what you have to determine is yours according to the spreadsheets in this thread.

black150
Posts: 4
Joined: Tue Nov 19, 2019 1:32 am
Vehicle: 213 Ford F-150 5.0

Re: Setting arbitrary tire sizes for speedometer calibration

Post by black150 » Sun Nov 24, 2019 7:33 am

I did this and didn’t work !
CombatDork wrote:
Fri Dec 22, 2017 8:14 pm
Ok.

1. Launch Forscan and connect to truck while running.
2. Click on the Chip icon, aka the "Configuration and Programming" tab.
3. Click on "BdyCM (AS BUILT format)"
4. Click on the Play icon, aka the "Run Service Procedure" button, on the bottom.
5. Read pop-up window and hit "Ok"
6. Click on the "Safe All" button at the bottom and save the stock data.
7. Click on the stop button, aka "Stop Service Procedure" button.
8. Click on the "Configuration and Programming" tab up top.
9. Click on the "BdyCM" line
10. Click on the Play icon, aka the "Run Service Procedure" button, on the bottom.
11. Click on the "Tire Size" line.
12. Click on the "Edit Selected" button near the bottom left.
13. Select other tire size and click ok.
14. Click on the stop button, aka "Stop Service Procedure" button

Repeat steps 1 through 5 and compare line by line and you should be able to find what the service procedure changed. That will be the tire size field.

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