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+--- Thread: Speedometer vs GPS... (/showthread.php?tid=3619)
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RE: Speedometer vs GPS... - AzBob_imp - 05-22-2014
(05-15-2014, 11:09 AM)Flynrider_imp Wrote: In the days of mechanical speedos, there were half a dozen variables that could affect the accuracy (and usually did). The electronic setup on our CB11s is simple by comparison. x number of pulses over y seconds = z mph. It's either dead accurate or obviously broken.
Last year I took my '13 out with the GPS and the only difference I saw was during acceleration/deceleration (probably a lag due to differences in processing time). Even then the difference was only +/- 2 mph and it stabilized quickly. At 95 mph on the bike speedo, my GPS said 94.6 mph. Not bad.
Electronics doesn't explain it. Just about every modern super sport bike's speedometer is _WAY_ off. My CBR is off by about 5%.
RE: Speedometer vs GPS... - flynrider - 05-22-2014
(05-22-2014, 01:30 AM)AzBob_imp Wrote:(05-15-2014, 11:09 AM)Flynrider_imp Wrote: In the days of mechanical speedos, there were half a dozen variables that could affect the accuracy (and usually did). The electronic setup on our CB11s is simple by comparison. x number of pulses over y seconds = z mph. It's either dead accurate or obviously broken.
Last year I took my '13 out with the GPS and the only difference I saw was during acceleration/deceleration (probably a lag due to differences in processing time). Even then the difference was only +/- 2 mph and it stabilized quickly. At 95 mph on the bike speedo, my GPS said 94.6 mph. Not bad.
Electronics doesn't explain it. Just about every modern super sport bike's speedometer is _WAY_ off. My CBR is off by about 5%.
Hmmm. I wasn't aware of that. The mechanicals have several points throughout the system that can introduce errors (cable, magnet, cup, etc...). Hard to figure why a full electronic system would be off. Basically, if the Hall effect sensor at the wheel is working properly, the rest is just math.
RE: Speedometer vs GPS... - DAC - 05-22-2014
A funny thing about speedo errors sometimes is that the odometer can still be right. Like I said, the VFR had a speedo error of 9% but the odo was right on. Out of curiosity one time I google mapped the distance of a ride I did against the odo and they were within a mile. (This was about a 180 mile ride.) Weird. Makes me feel like the error was intentional.