Least Expensive way to Recalibrate?

[SCLaunch]

I am looking to go to 37" tires, and no other crazy changes. What is the least expensive way to recalibrate the speedo, etc for the new tires? Just seems excessive to spend $200+ for anything I have seen on a device I'll use for the one change. Any other options?

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[cranbiz]

JScan. Software is free, license for 1 VIN is about $25, Bluetooth dongle is about $26 and a Y cable for about another $20

 

[cranbiz]

Let me add another $20 to that list. I would also buy the SGW extension cable. So, $100 is your outlay.

You can get away without the SGW extensions but if you don't get them, you have to unplug the cables from the SGW every time you want to use JScan and if your hands are like mine, that's a job you only want to do once.

 

[aqcjeepGlad]

Check this thread for another option some people use in the similar price category.

https://www.jeepgladiatorforum.com/forum/threads/does-anyone-use-this.72187/

 

[tysongladiator]

I second Jscan. It's a great option. Also, you can use it with other Chrysler vehicles. I use it on our JKU and parent's charger, ram, and caravan. All for less than $200. And like @cranbiz stated, get the extension cables.

 

[cranbiz]

Yes, that is another option. It's more expensive than JScan and it doesn't do as much as JScan does. It still needs to bypass the SGW. AlfaOBD is also another option, still needs the BT dongle, still needs a license but as I understand it, the Alfa license is a multi vehicle license (JScan also sells a multi vehicle license).

Any of these solutions IMHO you should buy the extension cable as they all need to bypass the SGW to work.

 

[LouisvEarlleJT]

You could also just go to the dealer and have them recalibrate it. I imagine that’s the cheapest option.

 

[Mr._Bill]

You could also just go to the dealer and have them recalibrate it. I imagine that’s the cheapest option.

The price charged by many dealers for a one time change is about the same cost as a Jscan setup.

 

[Lunentucker]

ECRI with bypass is $130, and you can do a few more things with it.
Works wirelessly with their app on your phone.

https://ecri.app/products/ecri-wireless-vehicle-calibration-device?variant=31532634898487

 

[ShadowsPapa]

I second Jscan. It's a great option. Also, you can use it with other Chrysler vehicles. I use it on our JKU and parent's charger, ram, and caravan. All for less than $200. And like @cranbiz stated, get the extension cables.

Not only that but the stuff you can do with JSCAN like diagnostics, and more. You can track misfires, capture freeze frames, adjust TPMS thresholds, and so on. Cheap and easy.
You can also diagnose by triggering HVAC components, use it to help center the steering wheel after a lift by showing the degrees the steering wheel is turned on your phone while you are under your truck................

The price charged by many dealers for a one time change is about the same cost as a Jscan setup.

Yup - but you then own the JSCAN stuff for the future while the dealer charges you and all you have is a changed setting.

I love the diagnostics and logging capabilities.

And I can use it to set the idle speed up while using the winch.

 

[ShadowsPapa]

Yes, that is another option. It's more expensive than JScan and it doesn't do as much as JScan does. It still needs to bypass the SGW. AlfaOBD is also another option, still needs the BT dongle, still needs a license but as I understand it, the Alfa license is a multi vehicle license (JScan also sells a multi vehicle license).

Any of these solutions IMHO you should buy the extension cable as they all need to bypass the SGW to work.

AlfaOBD isn't connected to any VIN, and you can install it on multiple Android devices like a tablet and a phone. It does have a Windows version but that is a different fee.

 

[tysongladiator]

Not only that but the stuff you can do with JSCAN like diagnostics, and more. You can track misfires, capture freeze frames, adjust TPMS thresholds, and so on. Cheap and easy.
You can also diagnose by triggering HVAC components, use it to help center the steering wheel after a lift by showing the degrees the steering wheel is turned on your phone while you are under your truck................




Yup - but you then own the JSCAN stuff for the future while the dealer charges you and all you have is a changed setting.

I love the diagnostics and logging capabilities.

And I can use it to set the idle speed up while using the winch.

Hmmm.... I didn't know about the centering the steering wheel option. That's awesome. But then again, the app probably has a lot more things since it's updated. Good information!!!

 

[dmwphoto]

You could also just go to the dealer and have them recalibrate it. I imagine that’s the cheapest option.

I second this option. not expensive and done right.

 

[tysongladiator]

The price charged by many dealers for a one time change is about the same cost as a Jscan setup.

Yep, you're right! And at some dealerships, it costs more. When all they're going to do is connect to the PCM and tell it that it has larger tires. There is no possible way that anyone should mess that up. Unless they can't count or read and don't know their tire size.

Jscan is pretty simple to me. But that's just my opinion.

 

[ShadowsPapa]

I second this option. not expensive and done right.

Jokes and humor are in the O thread.

Done right - the same folks that say "your winch is draining your battery" while they stand next to a big red switch that says OFF, right next to the battery.
The same folks who say "I fixed it" and they move the winch ground cable from the battery negative to a small stud on the fender - the same stud the battery negative is connected to.
The same folks who use an impact wrench to torque wheels ( and the list goes on)

Dealership may charge $100. Many have a minimum (even if you happen too accidentally find one that does it right). That minimum could be 1 hour, could be 1/2 hour, but it's likely not far from the cost of a DIY device.

Scenario 1 - dealer does the tire size recalibration. They look at the tire, hmm, a 33, and now you have two possibilities:
A. Dealer looks up the tire and sees the diameter posted is 32.8" and that's what they plug in. (gets you close if lucky)
B. Dealer measures tire as it sits on the truck and plugs it in (more correct)
And for each of those you have two possibilities -
tech uses his phone as GPS and checks accuracy
tech says "done, I plugged in what they told me, good enough"
I'd bet dinner on "I plugged in the number I found, I'm done" and the assistant drives it out and parks it and they call you it's done.

Scenario 2 - you purchase the software and cable needed to DIY. You now own the equipment. It costs only slightly more than the dealer's fee - sometimes about the same.
you plug in the numbers, take it for a drive and compare with GPS and it's off a bit, you go back, tweak the number, drive it again - perfect (well, within any reasonable figure anyway)

And then you drive it a year or two and decide now you want a tire change - any one of many reasons from a list of possible reasons - want to lift it and get bigger for climbing up the side of the Grand Canyon and crossing the Colorado River, or mudding with friends, or whatever.

With 1. you go back to a dealer, pay again, roll the dice as to is it A or B
With 2. you own the stuff, you don't pay a penny extra.

Or, 2 years later you decide you want a Toyota Prius instead and sell your JT - you can now sell your bypass cable, extension cable, and BT adapter for about half of what you paid and get a bunch of your money back.
With 1, the dealer has your money.

If you own the software and hardware, you can also do much much more - got an odd misfire, decided to add power locks or passive entry or change to LED lighting?
Well, you could pay a dealer to make those changes, or - you could already own everything you need to do it yourself.

I just can't see paying the big bucks and hoping you get a tech who actually plugs in correct numbers.
On the other hand - does anyone who takes their Jeep to a dealership to have the tire size change ever even both to LOOK to see if they did it right?
My bet is that half of those Jeeps done by a dealership are wrong if you compare the odometer and speedometer to fact.
Are they going to spend time? Or will they look at some chart, plug in a number and drive it out and collect your money and never bother to see if their number matches the reality.
I've looked up a fair number of tires and sometimes find that one site will say a tire is xx diameter and other have a different number..........

I guess I had to smile when I saw "done right" in the same sentence as the word "dealer".

If you will never do another thing to that Jeep, will never do anything else at all, don't care to ever reset any codes, read any codes, do any other diagnostics, will never change tires again and maybe not even keep it that long - the dealer may be worth it. Maybe - but to assume it will be done right, not so sure I'd go there as you can bet they won't do any more than go in, plug in a number, save it, and disconnect their equipment. It's up to you to test it and see if what they put in matches reality.

If I ever decide Jeep sucks, this is the last Jeep I'll ever own, sell 'em all, buy an Escape as a true off-road vehicle, I can at least recover some of my money selling the bypass cable and other stuff. You have an asset in those things, and it's an asset where the value keeps going up in the eyes of Jeep people (and even on Amazon - man, I'm glad I bought when I did.)

Yep, you're right! And at some dealerships, it costs more. When all they're going to do is connect to the PCM and tell it that it has larger tires. There is no possible way that anyone should mess that up. Unless they can't count or read and don't know their tire size.

Jscan is pretty simple to me. But that's just my opinion.

The problem comes in by size definition. The system stores it as a rolling circumference. The app or device translates that to a diameter.
So which diameter do you use? Is it a 33" tire? No, depending on the tire, brand, etc. it's likely a 32. 7 to 32.8 or similar while standing free.
But on the truck it's likely a 32.6
Took me two entries to get the odo and speedo to match GPS and reality. Nothing I looked up and plugged in was the exact number. I got it close, figured whether I needed to go higher or lower and changed the number a bit, tried it - spot-on.
Plus - if you change your mind in 2 years - you can go in and do it again for FREE. Dealer won't do it again for free. Sell the Jeep? Then sell the equipment and get some of your money back. Sell your Jeep? Can't go to a dealer and ask for money back because you sold your Jeep.

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