Fix the MPH on Lifted JTs?!

[ThomFoolery]

So of course since I went up to 37s the MPH is off. I know there are tuners to fix this, and I also asked Jeep if they could just recalibrate it and the guy I saw wasn’t sure. Any tips?!

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[Vegas_Sirk]

You need to wait till AEV comes out with the ProCal for the Gladiator. Should be out by year end.

 

[Hemi]

So of course since I went up to 37s the MPH is off. I know there are tuners to fix this, and I also asked Jeep if they could just recalibrate it and the guy I saw wasn’t sure. Any tips?!

Jeep service shop tuners only deal in tire sizes which Jeep sells, so you're out of luck there with 37s. You need an aftermarket tuner like a Procal or Flashcal; this is standard with lifts and tires and the shop that did it should have said something. They're the ones at fault.

The tuners are often tied to the VIN so you can't swap them vehicle to vehicle.

Here's a hack - get a GPS device like a Garmin and mount it where you can see it, and use it as a speedometer.

It's a good thing to have anyway, because even with a tuner, a 37" tire isn't 37", and the GPS helps dial in the correct setting. And you need to check at highway speeds, because if it is off it isn't in a linear fashion, the faster you go, the more it is off. I have been dead on at 30, but off 10 mph at 60.

Good luck

 

[ThomFoolery]

Jeep service shop tuners only deal in tire sizes which Jeep sells, so you're out of luck there with 37s. You need an aftermarket tuner like a Procal or Flashcal; this is standard with lifts and tires and the shop that did it should have said something. They're the ones at fault.

The tuners are often tied to the VIN so you can't swap them vehicle to vehicle.

Here's a hack - get a GPS device like a Garmin and mount it where you can see it, and use it as a speedometer.

It's a good thing to have anyway, because even with a tuner, a 37" tire isn't 37", and the GPS helps dial in the correct setting. And you need to check at highway speeds, because if it is off it isn't in a linear fashion, the faster you go, the more it is off. I have been dead on at 30, but off 10 mph at 60.

Good luck

Awesome, thank you for the response!

 

[Philyd1]

i bought one from Quadtratec and it worked perfect

 

[Jeepdude413]

So of course since I went up to 37s the MPH is off. I know there are tuners to fix this, and I also asked Jeep if they could just recalibrate it and the guy I saw wasn’t sure. Any tips?!

If u don’t want a tuner that’s going to allow you to change a bunch of stuff then I recommend a rough country tuner. Allows u to read and reset codes and calibrate the speedometer to within 1/4” tire size. I use it and it works good for my application. But that are the only 2 functions that it has. Very easy to use.

 

[Chance_P]

I use JL Tazer lite

 

[JP1]

So of course since I went up to 37s the MPH is off. I know there are tuners to fix this, and I also asked Jeep if they could just recalibrate it and the guy I saw wasn’t sure. Any tips?!

You need to wait till AEV comes out with the ProCal for the Gladiator. Should be out by year end.

WRONG
I have been known to be blunt, BUT THIS BULLSHIT IS JUST WRONG!

YOU HAVE SEVERAL CHOICES:
1. I went TazerJL, works perfectly.
2. I sold that to a buddy and went TazerJL mini, works perfectly.
3. Then there's Superchips Pulsar, if you don't want to mess with the output, I'll sell you my mini and be everyone's Huckleberry any try it...
4. The dealer CAN change it, if yours can't, find a new one...
5. probably more, but this "can't do anything until AEV blesses us" is BUILLSHIT.

I'm not targeting AEV here, I do have an issue when someone preaches that you have to wait for a certain shop when that's wrong...

 

[Renegade]

9 pages of info on dealer (and other) recalibration...
https://www.jlwranglerforums.com/fo...ter-and-odometer-for-bigger-tires.5548/page-9

 

[ThomFoolery]

WRONG
I have been known to be blunt, BUT THIS BULLSHIT IS JUST WRONG!

YOU HAVE SEVERAL CHOICES:
1. I went TazerJL, works perfectly.
2. I sold that to a buddy and went TazerJL mini, works perfectly.
3. Then there's Superchips Pulsar, if you don't want to mess with the output, I'll sell you my mini and be everyone's Huckleberry any try it...
4. The dealer CAN change it, if yours can't, find a new one...
5. probably more, but this "can't do anything until AEV blesses us" is BUILLSHIT.

I'm not targeting AEV here, I do have an issue when someone preaches that you have to wait for a certain shop when that's wrong...

How much do you want for the mini Doc?

 

[JP1]

How much do you want for the mini Doc?

hmmm

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