SCT Problem

[DarkBlue]

Ok so I have an x-cal 2......my problem is that I cant seem to find the correct tire revs per mile......I have 35" bfg all terrains and I have tried every setting from 585 to 605 and nothing is correcting my mileage or speedo problem, I just finished a trip that was around 135 miles according to my gps and map-quest but my trip mileage only read around 115 miles for the trip.....my question is that is anyone on here running these tires and found the correct setting to make my mileage and speedo accurate again? Thanks in advance

Shawn

[Dave]

The Xcal2 doesnt correct your speedo. Just your shift points.

Whats your exact tire size?

[DarkBlue]

I have the 315-70-17 BFG All Terrains.......but if the x-cal 2 doesn't correct the speedo what does the tire revs per mile parameter do?

[Lilpooh]

Nope x-2 don't correct speedo, the rev per mile is for correcting the shift points for trans.

It's best to manually measure your tires and calculate rev per mile.
Tire Revs Per Mile

You can have the dealer correct the speedo thru the OBDII or you can buy Autoenginuity to correct the speedo and have a decent diagnostic scan tool to help trouble shoot issues.

[TheFordman87]

I was told to put tape on the tire directly pointing to the ground and put a piece on the ground right at the same spot as the tire. Drive forward until the piece of tape has pointed directly to the ground after one full rotation. Mark that spot with tape and measure it. I think you have to multiply it by some too though. I can't remember now. I have had to many beers

[Dave]

Originally Posted by DarkBlue

I have the 315-70-17 BFG All Terrains.......but if the x-cal 2 doesn't correct the speedo what does the tire revs per mile parameter do?

Set it to 600 per BFG

[DarkBlue]

Thanks for the clarification guys.......Does anyone know how far off the speedo is with 35s?

[Dave]

Originally Posted by DarkBlue

Thanks for the clarification guys.......Does anyone know how far off the speedo is with 35s?

It will be about 3mph slower than what you're actually going.

[DarkBlue]

Dave - Thanks a ton for your instant answers to my questions

[Dave]

No problem man