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Old 03-15-2013, 06:34 PM
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Grubrunner Grubrunner is offline
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Just as an FYI.

Whenever you alter the OEM suspension/tire/wheel combo, you'll get similar results as I did below WITHOUT having your speedometer caliberated to offset the changes.

I used the Apple Application "Speedometer" and downloaded it onto my wife's iPhone 5, sat it up on the cluster and hit I-95 for a couple of miles to compare real-time.

I first tested it to see how it would compare with my Tahoe in terms of accuracy. Both my Tahoe [OEM] and the Apple App read identical between 45MPH - 80MPH.

Below are the pictures I snapped when I compared the Global Positioning System traced MPH, to my NON-CALIBERATED setup.

You can clearly see the diferences.



CC set at 55MPH




CC set at 60MPH




CC set at 65MPH




CC set at 70MPH



The above discrepancies are enough to get you a speeding ticket.

I purchased a Hypertech Speedometer Calibrator [752501] this week [arrived today] and will install it tomorrow. The $150.00 or so for or the Hypertech Speedometer Calibrator is worth every penny IMHO as you'll pay that, and then probably some more, for a SINGLE speeding ticket.
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Truck was sold today [5/19]. I got an offer I couldn't turn down. I had no more need for a pickup so I cut it loose. About to purchase a '14 Jeep SRT8 this week.

Grub out!
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