When I bought my 2013, the deal was the dealer would take the little steelies off and put a bigger set of factory takeoffs on it, but they never corrected the Speedo, so it's been 6mph off the whole time I've had it. Now I have a 2017 on special order with the little steel wheels again, but I already have a set on 285/70/17 waiting to go on it. The service dept quoted me $150 to reprogram the speedometer, or I can get a new Flashcal for about $180... But is the Flashcal plug-and-play, no extra chips/downloads/codes needed? And somebody claimed on one post I saw that the Flashcal might be more accurate than the dealer programming?

 

Hook it to the OBDII port, scroll through the screen to tire size and set it. Then disconnect it from the OBDII port. Easy peasy.

 

Well worth the money vs. a 1-time dealer fix. It is essentially plug and play, and the new interface is very user friendly.

 

AEV Procal will work too, easier to use than a flashcal

 

eh... I disagree. I use an AEV ProCal on my jeep and use the FlashCal on my wife's jeep. Hard to read the dip switches (yeah, I'm to the age I wear bifocals) on the AEV whereas the FlashCal has the nice screen to read.

 

I've had both too. The flashcal turned into a flashpaq, the processor is way too slow and takes a few min to go through the whole process while the procal is set a few dip switches and put it into the OBD port for a few seconds.
I have a Diablo now and it's still not as fast as the Procal for quick changes like this.

either one will get the job done, just my personal experience on which one is better for this instance.

 

The manual says you need to plug the flashcal/flashpaq into your computer to update the latest code before using on your jeep. Because of all of the versions of superchips code and versions of jeep code and everything, some people have reported problems using them. (from my experience, their support staff royally sucks...) On the plus side, these units have a nice screen to look at to see what you are doing.

A flashcal is internet upgradeable to a flashpaq. So if you think that you might want to try some tuning in the future, that's a nice bonus. And they offer half-off upgrades every so often.

The procal is just dipswitches, no screen, no internet updates, not different versions of code. You look at the cheat sheet, set the switches to whatever you want to do, plug it in, and a quick 'honk honk' will tell you it's done.

(I have had all three. A procal, then a flashpaq to try the tunes, then sold the flashpaq because I didn't 'feel' the tuned power, then lost the procal and bought a flashcal, then upgraded it to a flashpaq becuae it was half-off. And then got another procal becuase I just like them better...)

Look around some more, you will find posts that flashpaq is more accurate than procal, procal is more accurate than a flashpaq (what I found to be true), dealer machines can't go up past stock 32" tires, etc etc. The bonus for having your own is that you can test them with your gps. If the speed isn't accurate, you just raise or lower the tire size until it is right.

 

Its coming with the max-tow, will it adjust for or know it has the lower geared rears?

 

Yes, the computer was set from the factory with the correct gears and tire height. The programmers/tuners read that 'stock' file, save a copy of it, then rewrite it to whatever new tire height and/or gear ratio you plug in.

 

I picked up a Flashcal for $150 on amazon. It's easy to use, no extra equipment needed. Plug into the diagnostic port and follow the prompts