The 12 Minutes Test/reset

You have a ventilator on your bike? You're taking this COVID thing way too seriously...

 

Hi there!
I did it for the exhaust that I put on but I don’t know if it made any difference tbh. I suppose that it must have. I think you can use it also to reset errors?
But only if they have been rectified of course. I could be totally wrong!

 

I didn't know about the 12 minute thing but have used the "3 heat cycle" trick to reset errors in the past.
Although my errors have normally cleared before needing all 3 cycles.

 

Not sure it made any great difference to any of my bikes. Is your Sprint on the later map? I think it changed in 2008 for improved starting. I have all the maps downloaded from Tuneecu.

 

Most ECU will reset if the battery is disconnected, but the reset is just short term fuelling and timing maps, the ECU is capable of learning and responding to minor changes like fuel octane changes an in tandem ignition timing changes because of this and loading changes, these changes are very small and if reset the ECU will go through relearning these parameters again BUT only to the given conditions and these will change constantly once on the move.

As for lambda feedback i have been told that lambda feedback is only active at idle and low RPM on most bikes unless some now have full time wideband lambda?
So fuelling is set in the map, but timing has default maps should low grade fuel be used, but I have also been told bikes don't have a knock sensor, so timing cannot be pulled should low grade fuel be used etc.

 

In my experience of ECUs you just disconnect the battery and this will reset the idle learn, but 12 minutes seems a bit long, short term fuel and timing will also be reset, but the ECU will relearn this if any large changes take place.

Things like exhaust and air filter changes will only affect the idle learn on a narrowband lambda setup as it is only idle and very low load that fuelling trim is affected by this not normal running, its only full time wideband IE intelligent ECU that can adjust for such things.

 

Oh! And apparently Triumph ECUs don't have knock sensors so can't pull timing advance if knock is detected from using low grade fuel or other fuelling problems....pretty basic really.

 

pressed the wrong emoji LOL

 

This document is a couple of years old but it is still current I think. It looks more complex than it is in fairness. The process is very strict, start from cold without touching the throttle, leave for 12 minutes after the fan has come on, switch off. Touch the throttle and you have ruined it.

View attachment Triumph 12 min tune P1.jpg

View attachment Triumph 12 min tune P2.jpg

View attachment Triumph 12 min tune P3.jpg

 

Seems a bit daft to me as the ECU has no way of detecting fuelling changes other the narrowband lambda which only operates at low RPM/load and then the adjustment range of a narrowband lambda only detects rich or lean condition which the ECU constantly changes from one to the other in an effort to keep up...I can understand if changing fuel types or altitude but other than that it's a pointless exercise.