speedometer adjustment for tire size

[Jozef Zoldos]

I have a 2011 Expy EL Limited and I just placed on a lift kit and changed wheels/tires to LT295/70/18. What is the best way to adjust the accuracy of the speedometer?

 

[jeff kushner]

I know for motorcycles and scooters, there are programs that will run the calcs, just fill in the blanks .................google will be your friend here. I trust that there will be no shortage of tire retailer-sites to help<LOL>


As I remember, the gearing programs needed tire size.....by running it leaving the gearing constant, that would give you the delta you are looking for.
Good luck,

jeff

 

[Vancouver Bob]

I ended up buying a used programmer off Craigslist and used that to adjust the speedo. I had to get online and pay to get have the programmer reset so that I could tie it to my Expedition.

 

[1970Maverick]

here is a tire sizing site that compares
specs, actual speed, gear ratios and much more to find the right tire for you.
https://tiresize.com/tiresizes/225-45R18.htm compare tire sizes

 

[intense98neon]

I believe you can adjust the tire size in Forscan if you know the circumference of the tire.

 

[Jozef Zoldos]

I believe you can adjust the tire size in Forscan if you know the circumference of the tire.

Thanks all for your help.

I just downloaded FORScan and purchased an OBDLINK EX adapter. I scoured the internet and there does seem to be some references out there to adjust the speedometer. Here is a link in case anyone is interested:


I am new to FORScan and I would like to learn more. Does anyone out there know about a good link to FORScan spreadsheets for a 2011 Expedition and/or a link to help me figure out versatility of this product? e.g., Is it possible to measure my transmission temperature with FORScan?

 

[intense98neon]

I'm not sure if this will work for the 2011, I have a 2017. You could always look in Forscan and see if the information matches up.

https://docs.google.com/spreadsheet...TKARDo2Y7lfSOMFj6Gott8g7yg/edit#gid=756156726

You can read the transmission temperature with the OBD2 adapter and the Torque app, that is what I do.

 

[Jozef Zoldos]

I looked. It does not work for 2011. Thanks for your attempt

Any other suggestions would be appreciated.

 

[Munkiebunz3]

Don't do it. With larger vs stock you get free miles (more distance coverage vs what the odo actually says). Just learn the mph table for the new tire sizes.

 

[Frank Wilson]

Don't do it. With larger vs stock you get free miles (more distance coverage vs what the odo actually says). Just learn the mph table for the new tire sizes.

Shssssssh. If you ever sell.