With the speedometer reading well below actual mph at highway speeds, I'm ready to install speedoDRD. Need to locate the connector at which the DRD is to be inserted. I've followed the speed sensor wiring from the front wheel up the forks and beyond and see it feeds to what appears to be somewhere up under the fuel tank (on top of the airbox?).
Don't want to take the tank off unnecessarily if the connector is somewhere beyond that point. Does anyone know at which location the connector is accessible? This is a three-blade connector in a 'V' configuration.
Kit: You are absolutely correct - I mistakenly stated the speedo was reading lower than actual speed. It's actually the reverse and is reading higher than actual speed.
No one ever did on that gen Sprint over the years. It's always been talk of SpeedoHealers, and such. I don't think the Sagem is involved, like the Keihin is, in the speedo readings.
Go the much cheaper (and easier) route: Install a Sigma bicycle computer. Dead accurate, and it gives you all sorts of other features. Don't use the wireless version.
10% is a big enough deal to do something about.
Can't see how a bike computer with one magnet and one pulse per wheel revolution can be all that accurate vs. a multi-pulsed signal/revolution of the OE mechanism.
Nor do I like a digital readout, but thanks for the suggestion.
The problem is a mechanical offset in the gauge itself. The ECU has the correct speed and the gauge handles it correctly because the odometer is accurate. There are no calibration components inside to fix the issue. I don't think the needle can be moved on its shaft. Short of finding a way to redo the digital calibration the only possible fix would be to alter the signals driving the movement.
It is neither mechanical nor an offset - an offset would be fixed across the range.
i.e. it would be a constant mph offset regardless of the speed
i.e. at 70 mph it would be 77; at 10mph it would be 17.
The needle CAN be removed, but offsetting it will not correct it.
Also note that the Sprint RS (for 00-04) or Speed Triple (for 05+) share exactly same issue and these have digital displays, not stepper motor drives.
On mine it's a fixed 6 mph offset from 20 mph up. This is compared against a digital readout taking speed direct from the ECU which tracks GPS speed closely.
The 'optimistic speedo' thing been discussed before, but I can't remember where. Apparently it's a Euro-spec; Harleys (for one) do not do this. Their speedometers are correct. I wonder if their 'export' bikes are different?
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