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Old 01-16-2013, 03:19 PM   #1
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necessary to change computer??

Is it necessary or recommended to change the tire settings in the comupter. I got 33s put on. I believe stocks on a 2012 are 32s. So we're only talking an inch difference. However, I got a 2.5 inch lift as well. Is that more of a reason to change the tire settings?
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Old 01-16-2013, 03:23 PM   #2
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Your spedometer is 3.125% off. At 65 thats 2-3mph slower than you are actually going. It's up to you if you want to. You can buy a procal and do it yourself or pay the dealer to do it.

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Old 01-16-2013, 03:44 PM   #3
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I've said this in other similar threads: A friend who owns a jeep rental business told me that every one of his automatic JKs that he put 33's on went into Limp Mode at about 7000 miles. He attributed it to the tire size. Recalibrating the speedometer was the fix.
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Old 01-16-2013, 04:08 PM   #4
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Not only is your speedometer off but your odometer is also going to be incorrect. False odometer readings is more of a problem than the speedometer being off.
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Old 01-16-2013, 06:09 PM   #5
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Quote:
Originally Posted by Moabite View Post
I've said this in other similar threads: A friend who owns a jeep rental business told me that every one of his automatic JKs that he put 33's on went into Limp Mode at about 7000 miles. He attributed it to the tire size. Recalibrating the speedometer was the fix.
2102+ JKs?

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Old 01-16-2013, 07:45 PM   #6
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So what all does recalibrating involve. My dealer has already told me they'd do it. I don't trust them but I'm prob not gonna get procal. Maybe this is the reason why my mpg seems to suck badly know. Getting a little better. Up to 15/mpg on interstate. Oddly enough I'm right about 7000 miles.
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Old 01-16-2013, 07:59 PM   #7
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2102+ JKs?

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No...I don't believe the 2102 Jeeps will be out for quite awhile...although they do seem to be releasing new models earlier every year. I'd love to get a preview. His are 2012...and maybe some '13s.
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Old 01-16-2013, 08:01 PM   #8
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Quote:
Originally Posted by jwright343 View Post
So what all does recalibrating involve. My dealer has already told me they'd do it. I don't trust them but I'm prob not gonna get procal. Maybe this is the reason why my mpg seems to suck badly know. Getting a little better. Up to 15/mpg on interstate. Oddly enough I'm right about 7000 miles.
If you've changed tire size and the dealer will correct the speedo, I'd go for it. I had Ford do that on a previous F-250. Toyota can't do it on my '08 Tundra. I will probably order a Procal sometime soon.
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Old 01-17-2013, 09:30 AM   #9
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I went from the stock 32s to 33s and my spedo was more CORRECT than the way it came. Verified via GPS. Speed and distance were dead on. Check over GPS first before you worry about recalibrating

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