Joined
·
19 Posts
Searching for speedometer recalibration fixes I came across Forscan software which enable editing BCM as built data. If you search for Forscan guides on google, you will find other Ford models are successfully being recalibrated for larger tires/ gear ratios (the lists go on) using Forscan.
I have only come across one other post on the transit forum where someone used Forscan to enable the trailer tow module in the BCM seen here:
http://www.fordtransitusaforum.com/towing/10274-installing-tow-trailer-hitch-wiring-harness-23.html
This is all foreign to me, but I like tinker.. I downloaded Forscan and bought the adapter off Amazon.. cost $30. It would be nice to have a dedicated thread to start comparing Transit as built data.
Getting back to tires.. larger tires.. I have read several posts over time that mention swapping gears or if already have 3.73 changing the gear ratio in the BCM to recalibrate the speedo.
I believe I found the gear ratio address.. mine is listed as:
726-02-01 0175 A6
Where X175 is your listed axle ratio... which in my case is 3.73.. (the last 2 digits A6 are a checksum?)
14B = 3.31
175 = 3.73
19A = 4.10
Using Forscan I have changed my ratio to 3.31 in the BCM, but it does not effect the speedo... which calculates speed of wheel sensors? Anyway I wanted to start a thread to discuss as built data mods for the Transit.. specifically dealing with tire swapping and speedo calibration
A good tutorial:
https://docs.google.com/document/d/1-8dKaS_Spu4Zw4hV_CrKC4tLoP9G8yejqegF1wxIqxY/edit
I have only come across one other post on the transit forum where someone used Forscan to enable the trailer tow module in the BCM seen here:
http://www.fordtransitusaforum.com/towing/10274-installing-tow-trailer-hitch-wiring-harness-23.html
This is all foreign to me, but I like tinker.. I downloaded Forscan and bought the adapter off Amazon.. cost $30. It would be nice to have a dedicated thread to start comparing Transit as built data.
Getting back to tires.. larger tires.. I have read several posts over time that mention swapping gears or if already have 3.73 changing the gear ratio in the BCM to recalibrate the speedo.
I believe I found the gear ratio address.. mine is listed as:
726-02-01 0175 A6
Where X175 is your listed axle ratio... which in my case is 3.73.. (the last 2 digits A6 are a checksum?)
14B = 3.31
175 = 3.73
19A = 4.10
Using Forscan I have changed my ratio to 3.31 in the BCM, but it does not effect the speedo... which calculates speed of wheel sensors? Anyway I wanted to start a thread to discuss as built data mods for the Transit.. specifically dealing with tire swapping and speedo calibration
A good tutorial:
https://docs.google.com/document/d/1-8dKaS_Spu4Zw4hV_CrKC4tLoP9G8yejqegF1wxIqxY/edit