Search found 2 matches

by Andrew1918
Wed Jun 07, 2017 1:12 pm
Forum: Beta testing
Topic: Setting arbitrary tire sizes for speedometer calibration
Replies: 108
Views: 105416

Re: Setting arbitrary tire sizes for speedometer calibration

I've worked out how to program any tire size you want in the BCM, which enables you go get a very accurate speedometer reading even if you have oversized non-factory tires. In all of the current model year cars I've looked at (Explorer, Fusion, Mustang, F150) the tire size is stored in the second f...
by Andrew1918
Wed Jun 07, 2017 12:50 pm
Forum: Diagnostics and Maintenance using FORScan
Topic: 2015 Ford Ranger xlt PX mk1 3.2ltr diesel
Replies: 5
Views: 5392

Re: 2015 Ford Ranger xlt PX mk1 3.2ltr diesel

My XLS came with 255/70/16 tyres. The formula to figure out the nominal circumference of the tyre size is ((255 * 70 * 0.02) + (16 * 25.4) ) * Pi(3.14159). Result is 2398.2898. Multiply that by the conversion factor of 96.7% and you get 2319mm rounded off. My “As Built” HEX at address 726-12-01 is ...