any info on poly lift kits? - Page 2 - JeepForum.com
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post #16 of 17 Old 12-17-2011, 12:54 PM
JeepN4KC
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Originally Posted by 07wkman View Post
ok thanks. this is probably another dumb ? but with the lift and bigger tires do you have to do any electronic re- calibration for any sensors or anything.
My research could be wrong or incomplete, if so can someone chime in. I found in order to recalibrate my speedo and the like after going from 245 stock tires to 265's my options are taking it to the dealer or buying a programmer. I have wanted (and have ordered a Christmas gift to myself) a Superchips Flashpaq 3875. Hopefully, I'll soon be able to resolve the speedo and whatnot issue with it. I have been on tire calculator sites like Mattydipps mentioned and found that I am actually running about 6.5-7% faster than speedo reflects.
Click here for quick claculator:
www.tiresizecalculator.info


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post #17 of 17 Old 12-17-2011, 02:28 PM
t3kmitch
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It means if you drive for one hour 66 miles, the odometer will only read 60. The average driver puts on between 12-15k a year, so each year you drive your truck actually has 1200-1500 more miles on it than it says. Sounds like a lot, but in the long run is that 6k miles difference in 4 years of driving going to matter that much in resale and/or maintenance costs? Not really..

Also my 10% is using a GPS to compare true speed to the speedometer, the tire calculators are theoretical as every tire varies by make and model.

To the OP, with the 3.7L you can't buy the same tuners that a lot of people around here use. Hypertech makes a tuner for 06 or 07+ 3.7L's but I don't think it calibrates for tire size, they have a separate calibrator for that (around $160-200). I've heard dealers can't adjust for tire sizes that aren't factory offered, but not sure if it's true everywhere.

http://hypertech.com/products-speedo...alibrator.aspx

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