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View Full Version : Correct Spedo For Larger Tires



dobby
January 25th, 2008, 06:51 AM
Do you have to make changes in ecm and tcm to Correct Spedo for larger tires.:help2:

markap81
January 25th, 2008, 11:04 AM
Only the ECM.

dobby
January 26th, 2008, 03:40 AM
Is this true for the 2008 models. (only make changes in the PCM).:Eyecrazy:

camcojb
January 26th, 2008, 04:33 AM
I change the tire revs in both just because, but I think it only uses the ecm info for the speedo. The tcm handles the shift points, lockup, etc. yet some info does not have to be correct for it to work; for example, the trucks come with a 3.73 rear and every tcm I've looked at lists the gear ratio at 4.10 on the stock file.

Jody

bar836
January 30th, 2008, 06:05 AM
do you have the ability to change the tire pressures for the monitoring system with the EFI Live?

camcojb
January 30th, 2008, 06:12 AM
do you have the ability to change the tire pressures for the monitoring system with the EFI Live?

no, needs a Tech II.

Jody

bar836
January 30th, 2008, 06:30 AM
Jody - I was at the dealer and was told that they could not change the tire pressures, that it wasn't adjustable with thier software. Is someone BS'ing me?

Thanks

camcojb
January 30th, 2008, 06:56 AM
Jody - I was at the dealer and was told that they could not change the tire pressures, that it wasn't adjustable with thier software. Is someone BS'ing me?

Thanks


they adjust mine at the dealers, as I had a tire swap as part of buying the truck. Either bs-ing or the guy had no clue, it's done through a Tech II.

Jody

bar836
January 30th, 2008, 07:05 AM
What vehicle are you running? I have an 07 3500. He said it only started that they couldn't adjust that parameter at the 07 LMM.

camcojb
January 30th, 2008, 08:31 AM
What vehicle are you running? I have an 07 3500. He said it only started that they couldn't adjust that parameter at the 07 LMM.


07.5 2500HD 4X CC

bar836
January 30th, 2008, 10:38 AM
Thanks !