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Speedo Inaccuracy Fix

I have that version also. As soon as u connect it to the cable and it recognizes the ecu type it will disappear. It only works on Harley ecu's and not ours.
 
Oz1200Guzzi said:
Easy fix! In the ECU, there is a setting for the calibration of the speedo. What you will need, is some software to be able to access it, change it, and rewrite the map back to the ECU. There are a number of values that are used as a baseline:
- No ABS or Conti ABS - 1547;
- Later N/B/S 2V no ABS - 13044;
- Stelvio Bosch ABS - 11811;
- Breva/Norge/Sport 1200 no ABS - 1630;

You will need to work out which way you need to adjust these numbers, using basic math, change them, upload your "new" map and go for a test ride.

TunerPro free is a package to allow you to see the mapping parameters, including the "Speedo Correction" table, this will require an XDF for the bike you have (1 or 2 lambda). You will also need some software to download your current map and then to rewrite it after you do these adjustments.

Hope this helps
Click to expand...

Seems the figures are the number of pulses during 500 meters. On my non-ABS 1200 Sport:
Wheel radius ~290 mm (rough measurement)
Pulses/turn = 6 (brake disc screw heads)
2 x 0,290 x Pi x 1630/6 = 495(apprx)
 
Checked my map today. Factor was actually 1547, not 1630 as I expected. Changed to 1630 and reduced error half way ... had 10%, now apprx 5. Just what could be expected according to my previous post, 83 is 5% of 1630. Only problem is the difference between odometer and speedo, the error is not of equal size. Odometer measured apprx 4% to long distance before, now starting to show to short and error will be increased with ideal correction for speed.
 
[
My 1991 Cal 3 speedo is off by 10 mile per hour (131 thousand miles). When I bought it new it was off 3mph. Thinking of going with electronic speedo.
 
Would imagine Jerry, that you have a "vague liar" (Veglia) speedo?
 
Oz1200Guzzi said:
Easy fix! In the ECU, there is a setting for the calibration of the speedo. What you will need, is some software to be able to access it, change it, and rewrite the map back to the ECU. There are a number of values that are used as a baseline:
- No ABS or Conti ABS - 1547;
- Later N/B/S 2V no ABS - 13044;
- Stelvio Bosch ABS - 11811;
- Breva/Norge/Sport 1200 no ABS - 1630;

You will need to work out which way you need to adjust these numbers, using basic math, change them, upload your "new" map and go for a test ride.

TunerPro free is a package to allow you to see the mapping parameters, including the "Speedo Correction" table, this will require an XDF for the bike you have (1 or 2 lambda). You will also need some software to download your current map and then to rewrite it after you do these adjustments.

Hope this helps
Click to expand...
I tried this on my 2018 V7III Special with TunerPro. The map changed, but the speedo did not change, whatever number I used.
 
I have done this with success. Did you try just a few numbers from what's on your map? Another thing to consider is the TC part on the mapping if it has a place in the map. I have not tried on a V73.
 
I tried a tweak on my Norge 1200 with ABS once. I was almost breaking the sound barrier just riding around the streets!

I reinstalled the previous map.
 
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