Dealership can now reprogram / calibrate speedometer and odometer for bigger tires

[Merica!]

Maybe that option is already available since the rubi comes with 4.10s?

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[OnlyOne]

I’ll wait for the Procal or the like. I have 37’s and while I dislike the speedo difference it’s not that much to worry about for the short time I’ll wait for the aftermarket.

 

[msujedi]

Here ya go. You can find out exactly: https://www.jlwranglerforums.com/forum/threads/tire-size-speedometer-vs-actual-mph-calculator.5553/
.

Nice! I used my gps watch on the way to Discount Tire & on the way home to get a sense of how far off I now am. Since I only went up from ~31s to ~33s, my speed isn't far off ... even at 70mph I'm only going about 73mph.

Since I recently taught my 7th grade math students about circles, I decided to teach them how to use tire sizes to find tire circumference. We calculated tire circumference of old & new, divided new by old, then multiplied that number by a few speeds to see the true speed despite the 'faulty' speedometer reading. The calculations came out just like the tacoma website in the link. I think I may be grooming a few future Jeepers too.

 

[DanW]

Nice! I used my gps watch on the way to Discount Tire & on the way home to get a sense of how far off I now am. Since I only went up from ~31s to ~33s, my speed isn't far off ... even at 70mph I'm only going about 73mph.

Since I recently taught my 7th grade math students about circles, I decided to teach them how to use tire sizes to find tire circumference. We calculated tire circumference of old & new, divided new by old, then multiplied that number by a few speeds to see the true speed despite the 'faulty' speedometer reading. The calculations came out just like the tacoma website in the link. I think I may be grooming a few future Jeepers too.

Ok, if you ever move to Indianapolis, I'll offer you a job! That's my kind of real world Math right there! (I'm a middle school principal.)

 

[Riviera]

This is interesting that it's "news", considering i broke the story on March 11th https://www.jlwranglerforums.com/forum/threads/calibrate-for-35s.3070/page-4#post-103111, and the bulletin came out back in January

 

[OnlyOne]

This is interesting that it's "news", considering i broke the story on March 11th https://www.jlwranglerforums.com/forum/threads/calibrate-for-35s.3070/page-4#post-103111, and the bulletin came out back in January

That’s cool.

 

[lucky2be]

I'd jump at having the dealer do it, if they could also lower the TPMS threshold. If they can't do that, then I'll wait and put the $125 toward a programmer that lets me take care of that, too.

I'd have to doubt any dealer is going to touch the tpms thresholds for us, I vaguely remember there being an episode with ford explorer tires exploding that stopped that whole deal. At least I haven't found any that would do it in the last few vehicles I've bought, saving my 125 for a programmer to fix it all the way I want. Hopefully they'll figure out something shortly.

 

[kkuntz01]

I'd have to doubt any dealer is going to touch the tpms thresholds for us, I vaguely remember there being an episode with ford explorer tires exploding that stopped that whole deal. At least I haven't found any that would do it in the last few vehicles I've bought, saving my 125 for a programmer to fix it all the way I want. Hopefully they'll figure out something shortly.

I could be wrong, but I don’t TPMS sensors were at play with the whole Ford/Firestone debacle. If anything that whole cluster is what brought about the mandate that all vehicles come equipped with TPMS sensors. If what I had heard is correct, the issue at play in the Ford Exporer situation, ford opted to put an LT tire on their passenger SUV and their customers were complaining about how poor the ride was. Their “solution” was to run the tires at a lower PSI to soften up the ride to make customers happy. The problem with that was running the tires at a lower PSI inadvertently caused them overheat causing the bonding agent used adhere the tire tread to the tire carcass to separate.

Parlaying that into current times, auto manufactures don’t want the liability involved with allowing the TPMS thresholds to be changed as it could open them up to lawsuits if there were ever an accident that involved a vehicle that they lowered the thresholds on.

 

[JIMBOX]

AEV is currently working on the AEV PROCAL MODULE for application to the JL jeep--

Shouldn't be too long then you can change your driving lites/shifting points/axle ratio and speedo, besides being able to increase jeeps idle speed for up to ten minutes while at rest !

Whatever

JIMBO

 

[DanW]

AEV is currently working on the AEV PROCAL MODULE for application to the JL jeep--

Shouldn't be too long then you can change your driving lites/shifting points/axle ratio and speedo, besides being able to increase jeeps idle speed for up to ten minutes while at rest !

Whatever

JIMBO

Did you get this from AEV? They told me in January it would be at least 6 months. Maybe they are on it now?

 

[JIMBOX]

Yes, I talked to AEV last Thursday and they told me that's it's forthcoming !

JIMBO

 

[DanW]

Yes, I talked to AEV last Thursday and they told me that's it's forthcoming !

JIMBO

Great!! Any news on timeframe?

 

[JIMBOX]

No,I just hope it'll be in the next 1 to 2 months--

I'm afraid that we want everything "NOW" and it'll all be "LATER"--

Bummer-

JIMBO

 

[Greenie]

When I called a couple of dealers here in Austin, they quoted the fee of $125 but also mentioned I would need to buy a one time license for the programmer module ($200+). Is that accurate?

 

[DanW]

When I called a couple of dealers here in Austin, they quoted the fee of $125 but also mentioned I would need to buy a one time license for the programmer module ($200+). Is that accurate?

Sounds fishy, or like they're planning on using aftermarket modules, as is my dealership. If that is the case, though, if you get to keep the programmer, maybe 300 bucks isn't bad?

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