09-06-2009, 03:08 PM
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#1 (permalink)
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Master EcoModder
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Checked your odometer, lately?
Greetings,
We went on a family day trip yesterday (to go watch a UMass men's rugby game), and I took advantage of the mile markers (every 0.2 miles) they have along Route 2 to check the accuracy of the xD's odometer. I reset the Trip B odometer as I past the 100 mile mark, and then I watched as I drove along. The result was that the odometer is reading ~3% too low -- it is off by slightly more than 0.8 miles over 26 miles. In other words, the odometer finally read 26 miles when I past the 26.8 mile marker.
If you have not checked your odometer -- it might be reading too few or too many miles, so it is worth checking for better accuracy of your FE.
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The Following 2 Users Say Thank You to NeilBlanchard For This Useful Post:
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09-06-2009, 03:15 PM
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#2 (permalink)
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Dartmouth 2010
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Good reminder! Last time I checked mine was off by about that much but I was too lazy to be on top of correcting for it every time 
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09-06-2009, 03:40 PM
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#3 (permalink)
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Master EcoModder
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When I purchase a used car this is the first thing I check.
In Washington on I-90 near Medical Lake there is a odometer checker. I'm not to sure if other states have them but they come in handy.
Nice reminder 
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09-06-2009, 03:48 PM
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#4 (permalink)
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EcoModding Lurker
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I just recently used my GPS to compare the speed I was actually driving to what the SG/speedometer was showing and I was actually surprised by how close they were (difference of less than 1 mph going 65).
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09-06-2009, 10:20 PM
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#5 (permalink)
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Buddy Club Spec 2
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i need to calibrate mine, i'm running 205/45/16 compared to stock 195/55/15 and before my current 205/45/16 i was on 195/50/15 w/ rnr replica rims to go as low as possible w/o rubbing the subframe w/o sacrificing too much size difference
i don't feeel like googling right now too tired, anyone want to link me or tell me how to calibrate my speedo/odo?
thanks!
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09-07-2009, 12:09 AM
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#6 (permalink)
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Pokémoderator
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Luxbg -
Quote:
Originally Posted by Luxbg
I just recently used my GPS to compare the speed I was actually driving to what the SG/speedometer was showing and I was actually surprised by how close they were (difference of less than 1 mph going 65).
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I just did a GPS check on my wife's Civic :
31.5 Miles GPS / 30.3 miles odometer = 1.0396 => 3.96% => The odometer is almost 4% too slow!!!
I don't remember it being off by that much in the past. It had OEM tires back then, but I am positive we are using the same tire size on the new set.
CarloSW2
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09-07-2009, 12:45 AM
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#7 (permalink)
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Master EcoModder
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Remember that this can change as your tires wear, too. It can easily be a % or two different between new tires and worn ones.
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- - - - -Best 11-mile commute: 105 mpg
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09-07-2009, 06:01 AM
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#8 (permalink)
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aero guerrilla
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I have to set the cruise control to 73 km/h for the GPS to show 70 km/h (more than 4% off), but at 100 km/h the cc also has to be 3 km/h more (103 km/h, only 3% off). It appears that the difference depends on speed?
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e·co·mod·ding: the art of turning vehicles into what they should be
What matters is where you're going, not how fast.
"... we humans tend to screw up everything that's good enough as it is...or everything that we're attracted to, we love to go and defile it." - Chris Cornell
Piwoslaw's Peugeot 307sw modding thread
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09-07-2009, 09:32 AM
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#9 (permalink)
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EcoModding Lurker
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Hmm, more accurate at higher speed?
Perhaps the factory calibrated the speedo/odometer at highway cruising speed...
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Anthony
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09-07-2009, 01:09 PM
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#10 (permalink)
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EcoModding Lurker
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cfg83 - I haven't done a distance comparison yet, I was just looking at the indicated speed. Perhaps I should, as I assume the results would be much more accurate than just trying to compare speeds while driving!
I second what PaleMelanesian said, tire wear can easily make a difference too.
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