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Old 05-29-2012, 09:12 PM   #1
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Adjusting speed and Milage for 35's

Hello all,

Newbie here and a newbie to Jeep Wranglers. First let me say I love it. Hadn't even made a payment yet and been off-roading 2 times at Bridgeport TX and the Ozark's around Jasper Ark.

My question: The dealer added the 35 tires and lifted it 3 inches. After driving along with my GPS I noticed my speed was off by 7 miles at 60 miles and hour (67). I took it back and the tech said Jeep can't program for tires that big. Does anyone know if this is true? The speed doesn't bother me that much, but my milage being off does (although it comes to my advantage in regards to the warranty).

Is there a way to program a 2012 Jeep Wrangler?

Thanks!

Mark

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Old 05-29-2012, 10:06 PM   #2
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AEV procal it'll fix all your problems

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Old 05-31-2012, 09:41 PM   #3
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Thanks!! Ordering now.
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Old 05-31-2012, 09:57 PM   #4
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Yep, dealers can only flash your jeep to read for 32.1 or the stock sport S, rubi and sahara size tires. Above that your gonna need the procal.
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Old 06-01-2012, 10:18 AM   #5
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Where did you go off roading in Bridgeport. Is it open to the public? Thanks
Quote:
Originally Posted by kramnation View Post
Hello all,

Newbie here and a newbie to Jeep Wranglers. First let me say I love it. Hadn't even made a payment yet and been off-roading 2 times at Bridgeport TX and the Ozark's around Jasper Ark.

My question: The dealer added the 35 tires and lifted it 3 inches. After driving along with my GPS I noticed my speed was off by 7 miles at 60 miles and hour (67). I took it back and the tech said Jeep can't program for tires that big. Does anyone know if this is true? The speed doesn't bother me that much, but my milage being off does (although it comes to my advantage in regards to the warranty).

Is there a way to program a 2012 Jeep Wrangler?

Thanks!

Mark
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Old 06-01-2012, 11:02 AM   #6
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Just to throw in my .02, my 2012 JKU came from the dealer with 35"s, and I see negligible difference between the speedo and the GPS (+/- 1-2 MPH). I am running 3.21 gears, so that may be a factor.

I had to reprogram the computer in my Cobra when I installed 4.10's. Anything steeper than that (4.57 etc) and you had to get a speed compensation module to fix the reading.

I am not aware of an aftermarket speed compensator on my Jeep but, I have been mistaken once or twice before.
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Old 06-01-2012, 11:17 AM   #7
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Quote:
Originally Posted by BakedInMN
Just to throw in my .02, my 2012 JKU came from the dealer with 35"s, and I see negligible difference between the speedo and the GPS (+/- 1-2 MPH). I am running 3.21 gears, so that may be a factor.

I had to reprogram the computer in my Cobra when I installed 4.10's. Anything steeper than that (4.57 etc) and you had to get a speed compensation module to fix the reading.

I am not aware of an aftermarket speed compensator on my Jeep but, I have been mistaken once or twice before.
You should have true dealer reprogram it or buy the Procal.
I used my Superchips to set new tire size.
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Old 06-01-2012, 03:44 PM   #8
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FYI, if you are using your stock in dash GPS, it will be off also, it reads the same as your speedo! 35's will make your speedo off! Not to mention your odometer will show more miles than you actually have.

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Originally Posted by BakedInMN View Post
Just to throw in my .02, my 2012 JKU came from the dealer with 35"s, and I see negligible difference between the speedo and the GPS (+/- 1-2 MPH). I am running 3.21 gears, so that may be a factor.

I had to reprogram the computer in my Cobra when I installed 4.10's. Anything steeper than that (4.57 etc) and you had to get a speed compensation module to fix the reading.

I am not aware of an aftermarket speed compensator on my Jeep but, I have been mistaken once or twice before.
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Old 06-02-2012, 08:43 AM   #9
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Yes, open the the public, you just have to get the OHV sticker.
Here's a link Bridgeport, TX - Official Website - Northwest OHV Park

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Where did you go off roading in Bridgeport. Is it open to the public? Thanks
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Old 06-07-2012, 06:34 PM   #10
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Got it last night and 10 minutes later had it programmed. Thanks for the recommendation Dylanjwhall!
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Old 06-08-2012, 07:18 AM   #11
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Dumb question: I got 35s and I'm having a 2 1/2" lift installed next week. Is the odometer going to show more mileage than actual or less? I know someone said more, but if the larger takes longer to make a full rotation, I would think it would show less mileage. My mental capacity just isn't getting this lol.
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Old 06-08-2012, 08:02 AM   #12
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Quote:
Originally Posted by Guadzilla
Dumb question: I got 35s and I'm having a 2 1/2" lift installed next week. Is the odometer going to show more mileage than actual or less? I know someone said more, but if the larger takes longer to make a full rotation, I would think it would show less mileage. My mental capacity just isn't getting this lol.
Less
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Old 06-08-2012, 03:44 PM   #13
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Thanks!

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