This is how they explained it to me as well with the service contract and they had me drop it off in the morning and had it done in about 4 hours. They also emphasized it was a lot of paperwork and that's why it's not just a simple 30 minute job.Wanted to post an update on this. I just installed 37's on my JL yesterday and called my local Jeep dealer to set up an appointment to do this. The service writer was very knowledgeable about the process so i'm going to recap for those of you who may have one that isn't up to speed on it. When you take it in or call, you have to purchase the "MVP Calibration" - see image in first thread of this post. This is a one time $125 purchase that covers recalibrating it to your modded settings. Once you make this purchase, it then has to go to the finance department (you're basically buying a one-time service contract). The finance department then pulls the codes required to program and re-flash your jeep based on your VIN. (this is a step that the big dogs have written in so that the actual mechanics can't do it on the side for free). Then the finance department gets the codes to the actual technician who punches it in their system and reflashes the jeep. It's a drop it off and come back later type of appointment to allow time to jump thru all the hoops. Have mine setup for next week.
Hello,Good luck finding a dealer that even has a clue. I've called every dealer in my area about getting my pcm flashed and not one of them knows what I'm talking about. It's crazy how none of these dealers have been trained on how to work on these cars. Sounds like a issue for @JeepCares could pass up the chain.
They won't do it for free, but yes there is a fee. Our dealer charged $60 for the programming.This guy says you don't have to pay the $125 again if you need to recalibrate again in the future.
But good luck finding a dealership that won't charge you $1,000 labour and fees each and every time you need a recalibration.
The shift points are a big area of concern for me. I've noticed mine staying in 7th gear for extended periods of time...and sometimes downshifting to 6th...before I put the larger tires on it, it was shifting fine. I think a lot of that has a lot to do with the wind since its been pretty windy around these parts lately and the small hills that I drive on as well. My mpg is around 14.5 to 15.2 and I would expect that to read a bit differently after the re-flash. Before the larger tires, I was getting about 19.4 out of the 2 or 3 tanks I ran thru it before lifting it. I know I'm not going to get that again but I'm not an aggressive driver and this isn't a "go-fast vehicle"...it's a "go-anywhere vehicle"...but I would expect it to get a tad better than what it has been showing. We'll see but I won't lose a great deal of sleep over it if it doesn't as this is just my weekend toy and not my daily driver.I had the Jeep in to the dealer today and it took them about an hour. There was the paperwork stuff that was mentioned earlier. They did charge me the $55 plus the $125. I didn't argue it, this is the 4th Jeep I've bought from this dealer and they have been very good to me.
I compared the speedo now with the 37's before and after with a speedometer app. At actual 65 it was about 7mph slow. Now it's right on. My MPG reading went from 13.8 to 17.3. Obviously I'm not getting better MPG it's just reporting it more accurate.
I do feel the shift points are better, in hindsight I should have noted before and after.
Before I lifted the Jeep and put bigger tires on it, the MPG that I posted here were done manually so I could compare to the computer...the computer was within 0.1 to 0.3...if I remember correctly of my manual calculations. So, I would consider my computer to be fairly accurate. I haven't done the calculations manually since the larger tires have been installed because my speedo is off which also affects the odometer so I know that it wouldn't be anywhere close to accurate.Could people who post their MPGs with larger tires everywhere and always indicate if that's the computer readout or a manual calculation from a pump receipt, and also if the speedometer/odometer were recalibrated or not?
The numbers are meaningless unless that information is given.
What values did they change the TPMS to?I got mine done today. They were losing their minds with all the hoops they had to jump through and figure out. They kept saying how lucky they were that some higher up engineer was in today and was able to figure it out. They even looked up that YouTube video and went off that. Took 3 hours but I got my tpms lowered and my speedometer fixed .
Okay, if you haven't recalibrated your speedo/odo yet, you can correct your computer readout by calculating:Before I lifted the Jeep and put bigger tires on it, the MPG that I posted here were done manually so I could compare to the computer...the computer was within 0.1 to 0.3...if I remember correctly of my manual calculations. So, I would consider my computer to be fairly accurate. I haven't done the calculations manually since the larger tires have been installed because my speedo is off which also affects the odometer so I know that it wouldn't be anywhere close to accurate.
15.7Okay, if you haven't recalibrated your speedo/odo yet, you can correct your computer readout by calculating:
MPG readout * new tire size / old tire size
That should give you the correct figure. Is there any change in MPG from the stock tires to the new ones with the correct figure?
You can correct a manual calculation the same way if you are using the (wrong) odometer readout for your miles traveled.
It would help if people posting their MPGs with new tires indicate whether this is an uncorrected or corrected figure.