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Old 01-02-2013, 05:13 PM   #1 (permalink)
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What calibration factors are you getting with UG?

I think I may have been doing the calibration wrong for my 2005 Kia Spectra.

Tried to calibrate distance, went 4 miles on the interstate but ended up with a calibration factor of 0.8. Clearly that isn't right so I went back to 1.

When I did my first tank and entered amount used to calibrate fuel, I had a calibration factor of 1.1. (10% less than indicated ) On the next tank I did another calibration and suddenly my factor was 1.22... Although I did get pretty poor fuel economy on that tank, and I have been using different pumps. I also know I have a long filler neck on my tank.

The vehicle has a MAF sensor and stock wheels and tire size, so I just can't imagine these numbers being so far off. Just curious as to what factors are normal.

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Old 01-06-2013, 04:01 PM   #2 (permalink)
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From my experience calibrating an MPGuino and a ScanGauge, I'd say that it's best to drive the longest distance you can for the distance calibration. I have a 55 mile commute which I've used to calibrate them. But when I do the 300 approx miles drive to Watkins Glen each year I calibrate over that distance. Four miles doesn't seem nearly long enough, even if you were to stop and start the car right at the mileage posts.

I use a GPS to get the distance. I ignore the car's odometer for that purpose.
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Old 01-06-2013, 11:35 PM   #3 (permalink)
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I drove for two fill-ups to calibrate my UG. Fuel calibration was 1.130. My Mustang's on-board computer was closer, but still "optimistic" by about 5.2% on Summer blend fuel. It's closer with Winter blend fuel.
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Old 01-24-2013, 08:50 AM   #4 (permalink)
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There must be some problem with the catalytic converter or transmission sensors.I think you should get it professionally diagnosed.

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