speedometer

ABS bikes gets info from both wheel speed sensors then feeds speed to dash or ECU. On the the Super Tenere it was blue wire from ABS, not sure on the Duc. There is an ABS computer but it could be in the ECU. Think there are actually 4 different computers on the Multi12, don't know about this bike.

I assume that with all the hi tech, the speedo should be accurate, but I'll check it out with the GPS soon. I know my Bonnie was a little off, and the Vespa is like 7% optimistic after about 30 mph. I did get a warning ticket from a State Trooper about a month ago, he said he clocked me on the GTS doing 73. After he ran my license and registration, he came back and said he didn't want to write me a ticket for a "moped". He had just saved me around $200, so he can call it whatever he wants!

Wmak said:

I assume that with all the hi tech, the speedo should be accurate...

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Well, it isn't. The manual even states that the ECU takes the computed value and adds 5%. And I think it's off closer to 7% but have my yet confirmed.

I read an article a couple of years ago that claimed that European regs dictate that a speedometer can never real lower than actual, for any 'reasonable' wheel and tire combo that an owner might put on. So they look for the dumbest over-profile tire someone could fit and figure the error from that case.

porkrind said:

Well, it isn't. The manual even states that the ECU takes the computed value and adds 5%. And I think it's off closer to 7% but have my yet confirmed.

I read an article a couple of years ago that claimed that European regs dictate that a speedometer can never real lower than actual, for any 'reasonable' wheel and tire combo that an owner might put on. So they look for the dumbest over-profile tire someone could fit and figure the error from that case.

Click to expand...

But where does the ECU get its signals from?? the speed sensors maybe??
Then adds 5%