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Old 08-13-2015, 05:37 PM
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Speedometer calibration

Is there a way to get me speedometer accurate again after adding bigger tires. I went from a 265/50R20 to a 275/55R20. My speedometer is now 3-4mph off. The jeep dealership said they could reset the "pinion factor?!?" (Whatever that means) for 1 size larger or 1 size smaller than factory. Took them all of 10 minutes and said it was just a computer fix. Drove home and it's still 3-4mph off so whatever they did didn't help. Anyone have any suggestions? Thanks

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Old 08-13-2015, 08:31 PM
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Re: Speedometer calibration

It can't be done.


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Old 08-13-2015, 11:53 PM
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Re: Speedometer calibration

Diablo is supposed to be coming up with a solution sooner or later I believe. It just blows my mind that we can't alter the body computer to display the correct values. Like no company wants $100-$300 for some module that can accomplish this or there is no cheap USB flash cable and software that consumers have access to.
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Old 08-14-2015, 08:54 AM
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Re: Speedometer calibration

Jeep designed the computer system to only have settings for the OEM size tires, so unless something like farfrommovin mentions happens, "mental calculation" in the human brain will be the only way to adjust for the larger shoes.
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Old 08-14-2015, 10:39 AM
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Re: Speedometer calibration

Quote:
Originally Posted by Jim_in_PA View Post
Jeep designed the computer system to only have settings for the OEM size tires, so unless something like farfrommovin mentions happens, "mental calculation" in the human brain will be the only way to adjust for the larger shoes.
Are you suggesting that we think? GASP!
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Old 08-14-2015, 03:29 PM
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Re: Speedometer calibration

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Originally Posted by ekaz View Post
Are you suggesting that we think? GASP!

I suggest we adapt our $40k+ vehicles to keep accurate odometer readings, that's all. Seems like a tall bill though.
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Old 08-14-2015, 06:50 PM
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Re: Speedometer calibration

It's actually easy to adjust things so the speedo and odo are accurate...
,
,
,
,
,
,
,
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Run the OEM tire diameter size. heh...heh... But, yea, that's no fun for some folks.
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