Aftermarket speedo calibration

[Cabernet]

As some of you will know I have changed out my OE dash for a TransLogic Micro Dash.

 

All good so far and now I have sorted the basics, I want to fine tune things in.

 

My model is a 2003 naked sport (suspect it is actually a 2002).

 

I am running a 180/55/17.

 

To calibrate the speedo I have to tell the clocks when the rear wheel is doing 30mph.

 

To do this initially, I left the OE speedo connected and used that as the standard.

 

To me this feels like the speed is exaggerate and certainly my MPG seems rather good since the change out.

 

The dash self calibrates the revs of the timing circuit and returns a number of different options for different engine configurations.

 

Therefore I am pretty confident that the dash revs are accurate.

 

If some kind person could provide me with the revs the bike would have to do to achieve 30mph in 4th gear, I am confident that this will be a more reliable method.

 

Also the engine revs at 60mph in 6th for a second check.

 

Yours dawdling around below the speed limits (I hope)

 

Cabernet

[belfastguzzi]

Would another method be to check against a GPS speed reading? Are the consumer units or phone apps accurate enough for this?

 

________

 

- looking at comment on the web, GPS is dependent on circumstances and not 100% reliable for complete accuracy.

 

But I imagine it might be as good as other methods unless you can access specialist equipment and even your unit isn't going to give consistent 100% accuracy, as you change tyres, wear the tyre, lean off the tyre centre etc. So trials with a gps might do it?

Edited September 6, 2014 by belfastguzzi

[Cabernet]

Occurred to me since that the trip meter would probably be just as good. The M60 around Manchester is 36.1 miles.

If I trip and do a lap, the error in mileage should be proportional to the error in speed. So from that I can do a correction.

If the weather picks up this afternoon, I will try it out.

[chamberlin]

I am curious also, what you guys are getting for speed versus RPM. I have the SpeedHut gauges so my MPH is dead accurate. But I want to make sure I have my pulses per rev setting correct on the tachometer. I think I was getting about 4K @ 50mph in 4th gear. I also tried to get a reading at 60 in sixth, but the motor didn't like that combo, and was lugging a bit...my best guess was that it was turning just over 3K. The SpeedHut tach has an in-between setting of 2.5, whereas I'm at 2 pulses per rev now. Your confirming data will be appreciated!

 

Cabernet, sounds like your translogic dash does the RPM figuring for you, that's cool!

[Cabernet]

It half does yes. It shows a silly number of revs to start, but you scroll down through the options until you find the right one. It is pretty obvious when the right one comes up.

[rossi46]

30 in 4th@2100rpm

60 in 6th@3300rpm

using a garmin hope that helps

[Cabernet]

Cheers fella. Been doing that which Manchester is famed for all day. Hopefully get a chance next weekend. Donny tomorrow for the BSB.

[chamberlin]

30 in 4th@2100rpm

60 in 6th@3300rpm

using a garmin hope that helps

Great! Sounds like my tach doesn't need any fiddling with!