When to reprogram?
JK Enthusiast
Joined: Nov 2011
Posts: 176
Likes: 0
From: Sicily, Italy
Replaced wheels and tires a few months back, and the Chrysler service guy recommended I reprogram for the larger diameter and extra wheel weight.*
I went from stock 255 75 17 SRAs to 275 70 17 Duratracs and Tracker wheels.
Do I really need to reprogram? What's the best way to do that? I'm certainly not paying the dealership to do it, they try to rip me of every time I go in there.
I did notice my mpgs took a hit of about 4mpg. From 20 to 16 mpg. I figured that was normal and to be expected. Could I get some of that back by reprogramming?
I went from stock 255 75 17 SRAs to 275 70 17 Duratracs and Tracker wheels.
Do I really need to reprogram? What's the best way to do that? I'm certainly not paying the dealership to do it, they try to rip me of every time I go in there.
I did notice my mpgs took a hit of about 4mpg. From 20 to 16 mpg. I figured that was normal and to be expected. Could I get some of that back by reprogramming?
I think the cheapest way to do it is probably the AEV Procal. It doesn't have as many features as the Superchips for example, but if you just need to reprogram for tire size, it'll do it. You can alter your daytime running lights also, and turn off/adjust your TPMS, along with a few other options. I waited a few weeks before I reprogrammed as well (went from stock to 33's, then 35's), and I thought I was taking a huge hit on mpg's, but it was just the computer needing to be adjusted to the new tire size. Once I reprogrammed, there wasn't actually much noticeable difference in mpg, just power.
JK Jedi Master
Joined: Jan 2008
Posts: 11,463
Likes: 165
From: Austin <--> Colorado Springs
Was there a difference in the 'actual measured' tire height? (not the mfg's spec, not the converted metric value, but the actual measured height of both tires). It isn't all that uncommon for two tires from different mfg's that indicate the same height to vary by an inch. I don't see a 1" increase causing a 4 mpg drop, just asking to ask.
If you decide you do want to calibrate, the AEV Procal and Superchips FlashCal are good options. If you want to try for a bit of a performance boost also, there are plenty of threads on the popular tuners that are available.
If you decide you do want to calibrate, the AEV Procal and Superchips FlashCal are good options. If you want to try for a bit of a performance boost also, there are plenty of threads on the popular tuners that are available.
JK Jedi
Joined: Sep 2012
Posts: 4,364
Likes: 107
From: missoula,mt
JK Junkie
Joined: Nov 2013
Posts: 3,703
Likes: 8
From: The Dirty South
Reprogramming for tire size only corrects your speedo. I used an Aeroforce interceptor to do mine. It has the added ability of allowing you to monitor key motor functions as it is a gauge you install in the tub. It also allows you to reprogram gears to correct shift points if you need to do that eventually. Certainly not as powerful as the procal, but you get use out of it every day, not just when your reprogramming. If you are a heavy modder, then you probably want the procal. Just my 2 cents.
JK Enthusiast
Joined: Nov 2013
Posts: 333
Likes: 0
From: new haven, CT
If you do decide to reprogram you can use the Superchips Flashcal. This is allow you to adjust for the tire size and a few other things. Let me know if you have any specific questions or if you'd like a quote!
-Ryan
-Ryan