Tire size adjustment

[Traction450]

Help, my manual was thrown out with the package by mistake and I can't make my way through the programmer to make tire size adjustments. I know the previous and new metric tires sizes and how to do it once I get there but need the steps to get there. I know this is a newb questions, sorry...

[sohfast94]

Before you go to install tune it will ask you to modify... then select yes.. and scroll through the menu you will see it.

[Traction450]

thank you for the help!!!

I found it however it does not spell it out as the web site describes. Instead of entering in original tires size and new tire size you must calculate the RMP (Revolutions per Mile) of the tire and adjust it that way, does this sound correct? Also, which is more fuel effecient, the tow setting for the 6.4 or the +50HP setting for the 6.4?

Thats for the help...

Anyway to get a downloadable version of the users manual for the U7164?

[Traction450]

Any idea how to remove the "Answered" from the title so the follow up question can be seen?

[sohfast94]

The answer is simple... just do a percentage difference...

[Traction450]

thank Brian, i was able to do the calculation just wanted to make sure that was the correct way to adjust since the website called out the change another way. also, can you answer the other question, which setting is more effecient the tow or the +50 HP setting? thanks again for the help.

[sohfast94]

Actually as tested by diesel tech mag the extreme gets the best mileage... I attribute this to the added part throttle boost.

[Traction450]

Wish I could use that one however I pull trailers often and need to have the setting that will allow that...