Had the truck in for warranty service a few weeks back. Finally thought I'd try the 50HP tune today as the fuel mileage really sucks. Now I know why. They reflashed the truck and the predator won't recognize the new cal ids. I have the 9T13G crom in it. My new cal IDs are unit 1: 8U7A-14C204-CJ ...

Tried The 9T13G. Still the same issues. I cannot modify the transmission shift points nor is there any effect to the tire revs (the revs default to a 17" tire and I am currently on 20" & the speedo is still accurate for the 20").

Andy.

Andysapp wrote:
An addendum to all the other issues. I loaded the latest revision u7164-9r12a just to see. Loaded the 80HP tune and changed the shift points dramatically. The tune is in and absolutely nothing changed re shift points at all. As in my posts in another forum the tune does NOT allow me ...

An addendum to all the other issues. I loaded the latest revision u7164-9r12a just to see. Loaded the 80HP tune and changed the shift points dramatically. The tune is in and absolutely nothing changed re shift points at all. As in my posts in another forum the tune does NOT allow me to write to the ...

I am running the U7164-9R12 revision. I believe it is the tow tune I am currently on. I was told the U7164-9R12a was just to accommodate newer truck cals so I didn't bother.

P.S. the tow tune indicates a regen for a few seconds then the message disappears. Regen does seem to continue for a while ...

Post subject: 2008 Ford F250 King Ranch 6.4L- unable to change tire size Posted: Jan 24, 2010 - 07:52 PM




Joined: 05.10.09
Posts: 12


Hi. I have a 2008 Ford King Ranch F250 with 20" tires and have installed 17" winter tires (winter tires are not available in original size). I have tried ...

Hi. What is the difference between this crom u7164-9r12a and the original 9r12?

THX, Andy.

2008 F250 6.4l diesel.

andy, the 6.4 has always written the tcm :)

thank you for the feedback, i made progress on the tire size issue only to be slammed by 6.0 and 4.7 stuff that needs to be tested and get out. Don: Thanks for the reply. I missed one con: no cruise control.
Maybe I am reading wrong. I thought the TCM ...

An update to the custom tune you sent me:

Pros: love the fact I can actually write to the TCM. Fuel mileage appears to be better. Lots of power & nice response.

Cons: Unable to change tire size (no difference). In cold weather I had major surge issues twice coming down to idle (it revved up a fair ...

Transferred the tune to the predator. Installed as custom (shown as extreme) with no changes. Applied changes after to see if there was any difference. Same results each time. Note: I just overwrote the 80 hp tune already on the truck.

Sorry Don. I installed the tune. No difference re speedometer output. I tried a couple of different tire sizes but the error remains the same. If you have an updated CROM file that might work I am willing to give it a try.

Thx, Andy.

Working on a general fix as of right now, having some trouble getting my hands on a truck though.

I got a file i am emailing you right now..

Yes I got the file. Question. Since this is a FRD file rather than a CROM do I reinstall the original back up, load this one as a custom tune & install? Or ...

Hi Don: My Firestone tires are rated at 668 RPM.
Just wondering if you are working on a general tire size fix or if you response got lost?

Thx, Andy.

andy, who is the manufacturer of the tires themselves Hi Don: The current tires are Firestone Winterforce P265/70R17. The originals were what came with the truck from the factory. B.F Goodrich I believe. Hope this helps.

Thanks, Andy.

2008 Ford King Ranch F250 4X4 diesel

Hi. Thanks for the reply. The truck is a 4x4 but as far as I know it doesn't have traction control. If it helps I use the 80 HP tune for the fuel mileage.

The tires on it now are 265/70R17 down from the 285/65R20.

Thanks, Andy

2008 Ford King Ranch F250 4X4 diesel.