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Old 04-06-2010, 10:40 PM   #1 (permalink)
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Join Date: Dec 2008
Location: Noida, UP, India
Posts: 197

City - '04 Honda City iDSI EXi
90 day: 47.47 mpg (US)
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Question Speedo Accuracy with MPGuino :-(

I have a Honda City (Which is Honda Fit Aria elsewhere), and I have an MPGuino, that I managed to put on, and calibrate with values for Honda Fit, as available on MPGuino Wiki pages

I have the values scaled to show me KM/L readings, so my us/gal value is scaled down by a gal:L ratio, and VSS pulses/mile is also scaled down by mile:km ratio.

With that, I am generally happy, and the gizmo is helping me achieve new heights in FE. The figures shown are also plausible, so I guess the calibration values are accurate. No worries on that count.

What bothers me is there is a distinct difference between the speed indicated by the MPGuino, and the speed on the analog speedometer. The MPGuino appears to indicate slightly lower speed.

Is that because the MPGuino, or the speedo are out of calibration? Is it true that speedometers are calibrated with an error on the positive side, and the speed indicated on the dial is always slightly more than the absolute speed?

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