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Topic Review (Newest First)
08-15-2013 08:11 PM
gunmn74
ESP i did the exact same thing.

"I bought my 2010 JK with stock 225/75R16 wheels and tires. I upgraded to 255/75R17 "

It also messes up the odometer, Mpg reading, estimated fuel reading and trans shifts. I called the dealer today and was told 45 bucks and just drop in and they would do it especially since it is a factory option.
08-15-2013 07:34 PM
ROBDOG1 I did and it worked Great and was so easy to use!!
07-28-2013 12:32 PM
Xena1 Buy an AEV Procal and then you can set your tire height. I use the formula 63,360 which is inches per mile, divided by the tire maker's revs per mile, yours is 649 to result in 97.627 and then divide this by pye 3.14 giving you 31.09. The procal settings are in 1/4 inch increments so go with 31.00 and your speedometer will be right on.
07-28-2013 12:11 PM
ROBDOG1 AEV Procal
07-28-2013 11:09 AM
michiganadam
Quote:
Originally Posted by ROBDOG1 View Post
Got mine on order and will try it out this week thanks for your help!!
which one did you go with
07-28-2013 11:01 AM
ROBDOG1 Got mine on order and will try it out this week thanks for your help!!
07-27-2013 10:50 PM
michiganadam
Quote:
Originally Posted by Big Fran View Post
I happen to like daytime running lights. I'm not asking you to like them. I was told that Superchips Flashcal does not work with the new trans yet. I have a 2013. I got the Procal because It worked with my Jeep to change my speedo and shift points. Daytime running lights were just an extra that came with it.
Wow, no need to be so defensive.
07-27-2013 10:02 PM
Big Fran
Quote:
Originally Posted by michiganadam View Post
superchips flashcal is cheaper on quadratec at the moment and has an lcd screen.

why would anyone like daytime running lights anyhow?
I happen to like daytime running lights. I'm not asking you to like them. I was told that Superchips Flashcal does not work with the new trans yet. I have a 2013. I got the Procal because It worked with my Jeep to change my speedo and shift points. Daytime running lights were just an extra that came with it.
07-27-2013 09:41 PM
michiganadam superchips flashcal is cheaper on quadratec at the moment and has an lcd screen.

why would anyone like daytime running lights anyhow?
07-27-2013 09:15 PM
Big Fran
Quote:
Originally Posted by ROBDOG1 View Post
Was your Jeep sluggish after the larger tires? Could you tell a big difference with the Procal?
Thanks
It does not feel sluggish to me. It feels a little less peppy from a standing start then it did with the 33" tires but not by much. I used the Procal before I moved the Jeep after putting on the tires so I never felt any big difference. To me the Jeep drives just about the same as it did before I put the bigger tires on it. The BFG KM2's feel a little rougher when slowly rolling up to a light then the Duratrac's did. I had it up to 70 mph and it drives smooth as stock.
07-27-2013 08:54 PM
ROBDOG1
Quote:
Originally Posted by Big Fran View Post
My Jeep is a 2013 JKU. It was real easy. You just flip some dip switches on the Procal. It comes with a sheet that tells you how to arrange the dip switches for what you want the Procal to do.
Was your Jeep sluggish after the larger tires? Could you tell a big difference with the Procal?
Thanks
07-27-2013 08:04 PM
Big Fran
Quote:
Originally Posted by ROBDOG1 View Post
What year is your Jeep? What it simple to adjust?
My Jeep is a 2013 JKU. It was real easy. You just flip some dip switches on the Procal. It comes with a sheet that tells you how to arrange the dip switches for what you want the Procal to do.
07-27-2013 07:57 PM
ROBDOG1
Quote:
Originally Posted by Big Fran View Post
I have an auto and went to a 315x75x16 tire. I got a Procal and that was all I needed. Fixed the speedo and the shift points. The Procal also let me turn on day time running lights.
What year is your Jeep? What it simple to adjust?
07-27-2013 07:05 PM
Big Fran I have an auto and went to a 315x75x16 tire. I got a Procal and that was all I needed. Fixed the speedo and the shift points. The Procal also let me turn on day time running lights.
07-27-2013 06:49 PM
michiganadam My dealer (tyler in niles mich) said they can only do up to 32 inches and wanted 80 bucks. You can do it better yourself with a flashcal or procal.

Speedos that are 2 off are common from factories....
07-27-2013 06:35 PM
tupper
Quote:
Originally Posted by ESP View Post
maybe it was just a misunderstanding with the one guy that I talked too. If I call the Monday morning and I get similar answers from others then they should sell mufflers. I'm just worried about getting a ticket because I think I'm going 50 in a 45 but really I doing about 56!
I had the same problem, bought the aev procal and did it myself.... I drive a 2011 6sp manual.... it didn't adjust itself.... Oddly enough the only way I knew it was off was I had my gps in the jeep because I was headed on a trip.... at first I thought my gps was off.....lol Oh... and it really does depend where you're going.... when they say 45mph they mean 45mph not 46
07-27-2013 04:32 PM
ROBDOG1
Quote:
Originally Posted by ESP View Post
This is a three year old thread but to answer my own question, it cost about $120 to recalibrate the speedo at the dealership. A pro cal is only $150 and a better use of the money by far.

Welcome kik and dtm.
I went from 255/75R/17 to 305/70R/16 only about an 1 inch taller but almost 2 inches wider will the Procal help with the sluggish at highway speeds? The speedometer is only about 1-2 miles off???
Thanks
07-20-2013 01:18 AM
ohioviper Procal is well worth it and really a must have with an auto transmission.
07-19-2013 11:15 PM
Dozer13JK I had mine recalibrated for $65 because I have 35's. Speedo was easily 10-12 MPH off. Now it's only off by 1-2 MPH. :/ Oh, well. I can live with that.
07-19-2013 06:29 PM
UnJKlimited Definitely depends on the dealer. My dealer did it for free when I went from the mailman tires to 32" mud terrains.
07-19-2013 06:18 PM
ahsumtoy
What my dealership said

I think each dealership is different in what they say. Mine told me because of strick federal laws, Jeep couldn't adjust anything past a 285 tire. I don't know if this is the truth or not. I have 33's and my MPH was off by about 5 mph. This was at 65 mph per my GPS, my speedometer showed 60 mph.

Just go out and get a Pro Cal. It will adjust the speedo and a lot more and not void the warranty.
07-19-2013 01:17 PM
SuperDave81 I love how a stealership feels justified to charge $120 to reflag your ecu for tires when it takes all of about 30 seconds to plug in your new tire size and calibrate your speedo.
07-19-2013 01:10 PM
ESP
Quote:
Originally Posted by dawhitesJKU View Post
lmao...at least he's making use of the search function.


Oops...just bumped the thread up.
07-19-2013 01:06 PM
dawhitesJKU lmao...at least he's making use of the search function.
07-19-2013 12:47 PM
ESP This is a three year old thread but to answer my own question, it cost about $120 to recalibrate the speedo at the dealership. A pro cal is only $150 and a better use of the money by far.

Welcome kik and dtm.
07-19-2013 12:22 PM
kik
Quote:
Originally Posted by dtm4228 View Post
I'm in the same boat. went from sport 29in to Rubicon 32s... The dealer wants 113 bucks!!! Will the AEV void anything???
Get the AEV Procal and do it yourself. The cost isn't that much more than you would pay the dealer and you'll have it for future use as well. No, the Procal won't void anything.
07-19-2013 12:14 PM
dtm4228
Quote:
Originally Posted by JIMBOX View Post
If the dealer did the swap, they should do the "Flash" FREE !!






If you don't have it done (by them free) you won't be able to check your mileage/trip distance-speed !!

I did mine with the AEV Procal Module, which does a whole bunch of other things too--$139 bucks-

Good luck

JIMBO
I'm in the same boat. went from sport 29in to Rubicon 32s... The dealer wants 113 bucks!!! Will the AEV void anything???
11-08-2010 07:00 AM
ESP
Quote:
Originally Posted by UnJKlimited View Post
Did you get the Transmission Temp recall done yet? I did the same exact tire swap as you and I was off by 6 mph. I had the dealer flash my comp for the tires while it was in for the recall and they charged me $19.00.
My JK is a manual so I don't think it was affected by the recent temp recall. I'm going to call them today to find out if they will do it for me. I'll update as soon as I know - thanks for the suggestions.
11-07-2010 08:38 PM
UnJKlimited Did you get the Transmission Temp recall done yet? I did the same exact tire swap as you and I was off by 6 mph. I had the dealer flash my comp for the tires while it was in for the recall and they charged me $19.00.
11-07-2010 06:43 PM
ESP
Quote:
Originally Posted by JackdUp View Post
Do a search for tire calculator and input stock configuration and then current sizes. The calculator will show you the calculated differences. To be safe, drive within those parameters for now until the speedometer is corrected.
Yeah already did that, this is why I know its off. Not to mention I'm passing most people doing the "speed limit" when driving. I've also used GPS while driving (not as accurate) but its showing about the same difference.
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