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Old 10-12-2011, 02:01 PM   #1
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Thumbs down The speedometer calibration on the Superchips programmers suck

'Nuff said.

Even with the proper measurement entered, it took a lot of guesswork and trial and error to get the speedometer reading perfectly with my navigator.

Just a message to anyone who might be thinking of buying a Superchips programmer for that reason. You can recalibrate your speedometer, but it wont be easy!

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Old 10-12-2011, 03:18 PM   #2
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It's no difference with any other programmer. You are only changing numbers preset in the Jeeps ECU. The problem isn't the programmer, it's the fact that tire sizes are not always what they say they are and compression from the vehicles weight and PSI of the tire play such a huge variation. Just think if you don't have GPS and just have to guess. All you can do is hope there is one of those portable radar detectors that the police set up on the side of the road is somewhere close, lol. The best start is always 1" less then the tire size and .25 either way should get you close if 1" isn't right.

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Old 10-12-2011, 03:25 PM   #3
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I used superchips on my old trucks, never had issues with any of the adjustments, but, I also measured my tires with a tape measure to get the correct size not just do the math based on the tire size.

If you do research on tires, you'll see that sometimes different manufactures tires have different revolutions per mile and different outside diameters even though they are the same tire size.

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Old 10-12-2011, 03:32 PM   #4
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Also you want to measure the tire with full weight on the tires from the bottom to the center of the wheel. Center to top or sides will not account for compression
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Old 10-13-2011, 10:00 PM   #5
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I've never used the Superchips programmer, but I recently used a ProCal and it worked like a charm. I measured the height of the tire to the nearest quarter inch, set a couple of dipswitch settings on the ProCal, plugged the ProCal into the Jeep, and waited for the horn to sound telling me that everything was set. The whole process took less than 5 minutes.

Also, what everyone else is saying about tire size is true. I installed 35" tires and they only measure 34". If you don't measure the tire and only go by the manufacturer's size, that could throw off the speedometer when it gets programmed.
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