ECU remapping , truth or fiction?

To the knowledgeable engineers out there, I recently upgraded from Termi slip-ons to full system, with the subsequent loading of the FS upmap. I was told by the mechanic to ride it for a while before making any judgements as the bike may take some time adjust to the new map. I have heard this before but never understood why. Is there any science behind this? or it is just an urban legend?

The ECU has a period where it will adapt a little bit to optimize the operation of the engine.

pedrin said:

To the knowledgeable engineers out there, I recently upgraded from Termi slip-ons to full system, with the subsequent loading of the FS upmap. I was told by the mechanic to ride it for a while before making any judgements as the bike may take some time adjust to the new map. I have heard this before but never understood why. Is there any science behind this? or it is just an urban legend?

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No harm probing further with the mechanic,if your hunger for knowledge is not satisfied...since he was the one serving the appetizer.He should throw-in the main course too.

there's couple of dyno-chart(s) around relating to 1199,often they come with A/F ratio.Now this AFR is what the O2 sensor in the exhaust stream is measuring or in simple terms "what is the degree of leaness and richness" were the former combusted mixtures were.

This is my guess, the O2 sensor on the 1199 is likely to be a bipolar (0.5V or 4.5V) type which only tells you lean or rich but not the "degree" or level or lean/rich. For this, you need a wide-band O2 sensor (0.5..thru...4.5 corresponding to degree or lean/rich).

My point is or to cut this long storey to short, unless the ECU could measure or else it is "flying blind".To install a full termignoni which is full-on performance orientated, i think the bipolar O2 doesn't tell much..

The 916 and its earlier brethen, in the past comes with EFI open loop system, meaning no O2 sensor, it has to be tuned in the garage to get the best out of it unless the whole mechanical set-up of the engine /intake/exhaust is kept to the same tight production tolerances...all the EEPROMS sold may not be optimized.

Yup because the ECU runs closed loop via its 'adaptive tables' for at least part of the fuel map (my understanding is the area below 40% throttle) it will take some time to rebuild/readjust the 'adaptive tables', usually about 10km. The tables can be reset by disconnecting the battery but that won't make it much if any quicker to build.
If you want to explore how this works just run the bike with the probes in free air and see how long it takes for it to run like a bag of arseholes as it slowly increases the fuel to find the right AFR.
P