Bonneville America Forums Forums Technical Forums Performance Mods ECU question

I changed the front sprocket from 18 to 16 to make the bike more novice freindly and created a pretty good speedometer error in the process.

So, I am trying to correct the speedometer error on a 2012 speedmaster using tuneecu. has anyone else attempted this?
I am able to see all of the other adjustable parameters in the map and have the edit option, but not for the speedometer, it shows it and percent but will not give edit.
I have triedboth disconnected and connected to the bike. I am using tuneecuV2.3.5
any thoughts?
experience?

I have loaded and edited (and then loaded) maps with TuneECU. But I have a mechanical speedo and have not experimented with this. Have you "saved" the map the bike is currently using? If possible you would have to then edit and save the map and renaming or adding a character to the name to ID it would be a good measure. Then download the edited map to the bike. I will look at a map for a newer model and see how the speedo correction might work just to know.

Well now, I looked at the 20516 & 20516_custom maps for LCD models. I'm still using TuneECU 2.0 and the "speed adjust" parameter is there but grayed out. I could not find a way to edit it. Have seen speedometer correction discussed on TRat but believe it was about other models. You may want to send a note to Alain F and see if it is supposed to work for the America/Speedmaster line. Think I might look at a Bonneville map for LCD models and see if it can be edited for them.

edit: Just checked a Bonneville file (#20500) and the "speed adjust" is not grayed out and can be edited.

I talked to the guys at team triumph yesterday about this and they are
seeing the same thing (grayed out)
At least it is not just me screwing up with the tune ecu.

Interesting about the Bonnie tunes having that available.
Maybe an oversight somewhere?

got it fixed, needed a patch from the tune ecu guys, all better now.
I was a bit suprised that with 2 years of production on the all electronic america and speedmaster (and probably the scrambler) all with the same tunes that it had not come up before. I would have thought that many sprocket changes would have occured, affecting many speedometers.

I'm more surprised that Triumph doesn't offer their mechanics the ability to modify the digital speedo in the ECM. Perhaps because Triumph consider the speedo merely an indication of temporal transferance and not an accurate guage of velocity.