Mini Max Speedo ? - Ford Powerstroke Diesel Forum
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Old 07-07-2012, 05:51 PM
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Mini Max Speedo ?

Been trying to get my speedo to work correctly for some time off and on. I have tried couple times reprogramming and speedo is still 5mph off according to garmin gps.. I have went to manufacturer website and got exact tire height etc and still hasnt helped. Just swapped tires and re tuned and still same problem with different size tires.. Any suggestions?
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Old 07-07-2012, 06:21 PM
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if the exact tire height doesn't work, just keep adjusting the tire size until the speedo matches GPS

pretty simple
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Old 07-07-2012, 07:13 PM
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Ya that's how to get it to work, but I wonder why its not working correctly. At what speed is it 5mph off?
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Old 07-08-2012, 07:21 AM
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perhaps your GPS is off? Those things don't update by the second, and are really terrible at getting your exact speed. They'll get you in the ball park, but not exact.
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Old 07-08-2012, 12:11 PM
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Not sure always thought gps were pretty accurate on mph.. I have a garmin nuvi..
Yea it's simple but sucks waiting 15 min or more to guess at tire size. I've done it twice with no success..
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Old 07-08-2012, 12:12 PM
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And it's off 4 almost five at 60 mph and exactly 5 at 70
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Old 07-08-2012, 03:04 PM
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GPS is accurate. If you want your speedo accurate, you're going to have to reprogram till you figure it out
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Old 07-19-2012, 05:14 PM
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ao the speefo is not accurate with mini maxx? how about the odometer?
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Old 07-21-2012, 11:05 AM
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I would assume that if the speedo is off so will be the actual mileage on the truck.

I think this is a reason that there are so many discrepencies on fuel mileage because not all tuners can calibrate for tire size changes. I think if you go bigger tires and leave the stock programing mpg calibration is inflated. Correct me im wrong...
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