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Old 06-22-2013, 07:58 AM   #1
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Inaccurate speedo

Quick question, I bought my jeep seems to have had bigger rims and tires than stock put on, however, it seems to have thrown off he accuracy of my speedo by abt 5 mph. What's the best / easiest way to correct it?

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Old 06-22-2013, 08:00 AM   #2

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AEV Procal $150

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Old 06-22-2013, 08:19 AM   #3
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Thank you.... I know it's only 5mph off but....some times I forget myself!
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Old 06-22-2013, 09:44 AM   #4
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What my Jeep Dealer said

Originally Posted by kjeeper10 View Post
AEV Procal $150
I have 33's and when I asked my friend who runs the maintenance section for the Jeep dealership, he said Jeep can only calibrate up to 285's due to government regulations. Therefore, I went out and got the AEV Procal. Great investment. By the way, I have had my Jeep in for maintenance, and no one has said anything about the Jeeps computer being changed.
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Old 06-22-2013, 09:55 AM   #5
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Originally Posted by kjeeper10 View Post
AEV Procal $150

Inaccurate speedometer means inaccurate odometer.
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Old 06-22-2013, 11:18 AM   #6
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Dealership flashed mine after they installed bigger tires. I have checked it with two different gps's and it is accurate
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Old 06-22-2013, 12:29 PM   #7
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Originally Posted by VaderJK12 View Post
Inaccurate speedometer means inaccurate odometer.
I used to think this. However, I've read things over the years that say the speedo comes from the factory intentionally set to read slightly high for liability reasons, while the odometer is spot on. With the bigger tires he installed I guess both are no longer accurate but if he gets the speedo to read right then the odo will probably read slightly low.

I installed a speedometer calibration tool on my motorcycle where the speed was reading about 6.7% too high from the factory. That part is now accurate but the 25 mile ride to work shows slightly less now. I intend to get on the highway someday, zero out the trip meter next to a mile marker, ride exactly 30, 40, 50 or whatever miles, according to the mile markers and see how the two compare. So much to do and so little time, just haven't done it yet.
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Old 06-23-2013, 06:42 PM   #8
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Thanks everyone, I'll be buying the AEV Procal soon! thanks again

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