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Old 03-10-2013, 09:20 PM
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hodgeee hodgeee is offline
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Vehicle: 2012 dodge ram 1500 2x4
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Your 2011 ram is programmed to work with 33" tires. So as long as you are close to that, your speedo will be correct. I have 31.5" tires on my truck and I show 60mph when I am actually doing 58mph, so small effect depending on the tire size.

The trinity from diablosport has a program to change the tire sizes, but it doesn't work. I along with others have complained to Diablosport, and have been told that they are addressing it, and it when fixed it will be an updatable download. I was told this in January when the tuners first came out for the 11s and 12s.

You can have the dealership change the tire size if you wan't, but I wouldn't bother them, they will look for a reason to cancel your warrenty!

Also Hypertech's tuner for our trucks, there program to change tire size works on ours, and you can change this without effecting your tune, or having to install a tune, just the tire size adjustment. But that unit costs $220, a lot to just change tire size readings, but only doulbe what the dealership said they would charge me.
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Last edited by hodgeee; 03-10-2013 at 09:23 PM.
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