2006 Ram 2500 Tire Size CAN Change - How?
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2006 Ram 2500 Tire Size CAN Change - How?
I installed 325/60-20's on my '06 2500 Diesel, and of course the Speedo/Odo and anything related is off by about ten percent. No dealer or shop I spoke with seemed to have a concrete answer on how to change the CAN (computer) to compensate for the tire change.
The CAN tool has a list of tire sizes to choose from, but the largest one has 634 revs per mile and my tires have only 592 revs. So I had the dealer change the gear ratio entry instead, from 4.10 (that it actually has) to 3.73 - and still the Speedo/Odo is off by about ten percent. Since the larger tires effectively change the ratio to the pavement, I would think this would work.
I don't want to change the performance points - and besides, from what I can tell, no one makes a programmer for the retail public yet that communicates in the newer CAN language. (and I am told if I use one it will leave it's mark and my warranty will be voided accordingly) I tried the older the DRM language units, and they can't communicate, so that's out.
Does anyone know how to use the Chrysler CAN tool to compensate for tire sizes that aren't on their list? And why won't changing (programming) the ratio work?
Big B
The CAN tool has a list of tire sizes to choose from, but the largest one has 634 revs per mile and my tires have only 592 revs. So I had the dealer change the gear ratio entry instead, from 4.10 (that it actually has) to 3.73 - and still the Speedo/Odo is off by about ten percent. Since the larger tires effectively change the ratio to the pavement, I would think this would work.
I don't want to change the performance points - and besides, from what I can tell, no one makes a programmer for the retail public yet that communicates in the newer CAN language. (and I am told if I use one it will leave it's mark and my warranty will be voided accordingly) I tried the older the DRM language units, and they can't communicate, so that's out.
Does anyone know how to use the Chrysler CAN tool to compensate for tire sizes that aren't on their list? And why won't changing (programming) the ratio work?
Big B
