Calibrating for 35s - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 8 Old 10-26-2015, 12:44 AM Thread Starter
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Calibrating for 35s

I just bought my unlimited and it already has some wheels and tires on it. Moto Metal 17s with 35x12.50x17 General Grabber tires. Speed seems to be a little off and when overdrive is not turned off, it sounds like the transmission can't decide whether it wants to lock the converter in overdrive or drop back down a gear and kind of surges a bit until I push the pedal down enough to kick down the trans or I turn overdrive off with the button. Would a regular shop with a good scan tool be able to recalibrate the tire size for me or do I need something like Superchips flashcal/flashpaq?
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post #2 of 8 Old 10-26-2015, 06:54 AM
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Get a programmer and then you will have a useful tool.

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post #3 of 8 Old 10-26-2015, 09:23 AM Thread Starter
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Get a programmer and then you will have a useful tool.
I plan on it after Christmas. Just wanted something to help with shift points until then. Do you have a brand you prefer?
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post #4 of 8 Old 10-26-2015, 11:26 AM
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Look at the AEV ProCal and the Superchips FlashCal. They are programmers, so no performance tuning, just setting the tire size and gear ratio, and a few other useful features. The plus to the superchips is that it has a display screen, and can be updated to a flashpaq tuner if you decide to in the future.

If you look for a used programmer/tuner, buy it locally and make sure to plug it in and verify that it is not still locked to a previous vehicle VIN !!

I don't know if it has changed, but the dealerships used to only be able to program for stock tire sizes, not 35's. And when they did reprogram, people were reporting fairly steep charges, upwards of $100. (depending on the specific dealership)
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post #5 of 8 Old 10-26-2015, 11:35 AM Thread Starter
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Originally Posted by GreenJK View Post
Look at the AEV ProCal and the Superchips FlashCal. They are programmers, so no performance tuning, just setting the tire size and gear ratio, and a few other useful features. The plus to the superchips is that it has a display screen, and can be updated to a flashpaq tuner if you decide to in the future.

If you look for a used programmer/tuner, buy it locally and make sure to plug it in and verify that it is not still locked to a previous vehicle VIN !!

I don't know if it has changed, but the dealerships used to only be able to program for stock tire sizes, not 35's. And when they did reprogram, people were reporting fairly steep charges, upwards of $100. (depending on the specific dealership)
My friend owns a shop and has all the fancy scanners, so it would be free if it works. Just haven't made it over to his place yet. Thanks for the info. I really appreciate it!
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post #6 of 8 Old 10-26-2015, 01:04 PM
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More importantly.... what year, and what gears are you running ?

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post #7 of 8 Old 10-26-2015, 02:37 PM Thread Starter
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More importantly.... what year, and what gears are you running ?
It is a 2011 unlimited. Stock gears as far as I know. Bought it used and the riffs appear to be untouched. I am in the process of trying to find the dealership it came from and get the window sticker for it.
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post #8 of 8 Old 10-26-2015, 05:03 PM
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You can get your build sheet from Jeep pretty quickly via email.. search for the link to the site..


My 07 on 35's was confused about what gear it wanted to be in and downshifting searching for the right gear. Even calibrated for the 35's !


regearing took care of that

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