Correcting Speedometer Errors


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Correcting Speedometer Errors

Postby noeleo » Thu Sep 30, 2010 11:01 am



On my '87 Aspencade, the speedometer works well, but the other day I added a GPS and found the speedometer reading ~5-7 MPH higher than the GPS. Is this something that can be corrected? I thought I read a post heading about this, but now I can't seem to find it. :cry: I know that an error like this will probably not get me a ticket, but I still would like for it to be closer. Thanks in advance for your help.


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Re: Correcting Speedometer Errors

Postby Gypsy Rover » Thu Sep 30, 2010 11:14 am

Hi Noeleo, I posted a similar question some weeks ago regarding my 83 Aspey, it was consistently reading high. From the answers I got then it seems to be an endemic fault in all models, perhaps Honda's way of avoiding tickets?

In any event there wasn't any info forthcoming on a fix, just find out how much the error is, with a GPS as you have done and compensate for it. In mine it seems to be linear, off by 4 mph at at all speeds so I just run 5 over the posted limit.

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Re: Correcting Speedometer Errors

Postby WingAdmin » Thu Sep 30, 2010 1:15 pm

You can put a slightly larger tire/wheel on the front, which will make it rotate slower, and change the speedometer reading.

Interesting that this is endemic to the 1200's...my 1100 is virtually dead on accurate, matching my GPS speed at all speeds.
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Re: Correcting Speedometer Errors

Postby noeleo » Thu Sep 30, 2010 2:11 pm

In any event there wasn't any info forthcoming on a fix, just find out how much the error is, with a GPS as you have done and compensate for it. In mine it seems to be linear, off by 4 mph at at all speeds so I just run 5 over the posted limit.


I have found that in my case it is NOT, but logarithmic. At 60 MPH GPS says 54 MPH. AT 70 MPH, GPS says 63 MPH. At 80 MPH, GPS says 72 MPH. Seems more like a percentage-almost like an even 10% versus a continuous 5 or 6 MPH. Wondered about a resistance change in the signal. But then, what about the odometer? Is it off the same 10%? We are taking a trip to Fayetteville, AR for Bikes, Blues, and BBQ this weekend. I will set up the trip meter on the GPS for the trip and see just how much error the odometer has. Will post back after the trip.

Thanks again for the assistance.
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Re: Correcting Speedometer Errors

Postby Mooseman » Fri Oct 01, 2010 5:48 pm

I have noticed on my prior 85A and my 86A that the speedo always read faster than I was going. I think when Honda went to the electronic speedo that the error was put there on purpose for what ever reason. Maybe to make people think they were going faster than they really were. Would be nice if they made a sensor that did the proper read out. I have also noticed that the odometer is off also. SO around town I add about 5mph and at freeway speed I add about 8mph. Seems to be close. I don't have the GPS. Guess I'll have to pull out the stop watch.
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Re: Correcting Speedometer Errors

Postby 87wing » Fri Oct 01, 2010 9:23 pm

I've had this issue on several of my Hondas from the early 80's through 2000, and not just on the wing. I just learn the difference, and compensate as already mentioned.

My 87 is about 4 low at 40, 5 at 60, and 6 at 70 +/- per the GPS.
I just learn that 76 on the highway is really 70.
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Re: Correcting Speedometer Errors

Postby Roleketu » Wed Oct 06, 2010 4:17 pm

I've questioned this before also. Found it's a thing of the 1200's. My GPS shows the error is 10%.
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Re: Correcting Speedometer Errors

Postby TDarby719 » Sun Oct 10, 2010 10:07 pm

Many other forums and research has shown 10%(+/-) to be the approximate degree of the speed sensor error. Been talked about a lot with people attempting to correct the unit with no positive results. The odometer is obviously affected in the same fashion.
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Re: Correcting Speedometer Errors

Postby noeleo » Mon Oct 11, 2010 10:20 am

Yes, I, too find the 10% error to be about right. Next question then, could you put on a 10% larger front tire? That would slow down the sensor input to the speedometer, right? :? :? :?


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