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Single TB 750 AND V7Mk2 e.f.i. Accessory

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motopete View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote motopete Quote  Post ReplyReply Direct Link To This Post Posted: 13 Sep 2018 at 17:20
Out of interest, when you say "cleared the tables" what exactly did you do?

AFAIK the ECU doesn't learn, it just reads sensor inputs (engine speed, TPS, intake air temp, cylinder temp, exhaust lambda) to trim the mixture from the base map values.

I assume the base map isn't too far off ideal since some people run with the lambda's disconnected.

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jefrs View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jefrs Quote  Post ReplyReply Direct Link To This Post Posted: 13 Sep 2018 at 20:29
The ECU does learn in a primitive manner. There are two 10x10 look-up tables from the Lambdas, one for hot the other cold, it applies these to the base map. Disconnecting the battery or the main fuse powers down the system and clears the tables. 
This was suggested on here but is a fairly common trick with car ECU which can also get their shorts in a bunch, for example refuses to idle because it thinks its TPS is at full throttle (afaik the Guzzi ECU only stores data from the Lambdas). What can happen is false data or 'outliers' get stored which offset what it should be doing. The data are cumulative, the system keeps adding to them; the data set can get skewed. It effectively resets the system.  

There should be, because there usually is, some method of resetting or recalibrating the TPS. I don't know what it is on this bike, it varies from one vehicle to the next. Resets the 0% to 100% throttle position, which affects idle. On the other bike it's something like open throttle 100%, switch on and wait for lights to blink then close throttle and wait for another blink then switch off and wait 30 seconds; car is similar too. It's not normally in the manual.


I did disconnect the Lambdas but figured they're supposed to be connected; I get better results using a wide-band O2 on the other bike than without - but with a Power Commander custom map. 

I seem to be getting, and this is subjective, better result with the Lambdas connected but with the tables cleared. But note I have also mopped out oil from the air box, which should not have been in there, and probably contributed to any problem.

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