Afterfiring - inconsistent but persistent

[Tom H]

Did you load the Beetle map?

Tom

[normzone]

We did not load the Beetle Map - the day was running short, the mosquitos were running sharp, and I wanted to collect some data on the bike's behaviour for a few days/miles with the changes I had just made.

[wirespokes]

Thanks Tom - that makes sense. Are you saying that 40mpg is about average for the newer bikes with large windscreens and luggage?

[Tom H]

When I asked my local Guzzi guy if I was getting good or bad mileage, he said that 40 mpg is about right for my bikes and riding style. I was told about a guy that got like 65 or 70 out of an Ambo. I was told the bike was stripped to bare stock and he was laying on the tank, I don't remember the speed, but I think it was freeway. I think freeway at about that time was 55mph?

Like I mentioned, I feel that if I had open hwy's that I could cruise along at let's say 55mph without stopping at traffic lights seemingly every block, I'm pretty sure I could get near 50mpg.

What mileage do any of you guys get on a Loop or EV bike? Maybe this will help Norm and I'm curious.

Tom

[Tom H]

Norm, did your friend say what the CO trim is at?

Tom

[fotoguzzi]

Norm, did your friend say what the CO trim is at?

Tom

i think your on to something..  I just yesterday tweeked  the trim on a friends Coppa moved it to +30 and he reported the bucking and popping stopped.

This with the techno research software, boy is it slow to act but with patience we got the change made.BTW the Coppa had the race ECM and pipes, sounded wonderful.

[Kiwi Dave]

I'm thinking I need to acquire a viewer that will allow me to compare the two files and see what kind of deltas there are, if only for educational purposes.

You can use TunerPro to view the bin files.  I was easily able to get out of my knowledge depth when I ventured in here.

[beetle]

I'm with Tom & foto here.

Check the CO trim.

[normzone]

You can use TunerPro to view the bin files.  I was easily able to get out of my knowledge depth when I ventured in here.

I'm getting out of my knowledge depth just reading this thread.

[Beetle] said: " I'm with Tom & foto here. Check the CO trim. "

Is that a setting that can only be tweaked via laptop interface, or a mechanical adjustable on the bike itself ?

And, ELI5 (Explain Like I'm 5) if you can please, why would CO trim be a thing?

[beetle]

CO trim on the 15M is via GuzziDiag.

Each increment of +/- 1 adds or subtracts time to the real-time injector pulse.

[antmanbee]

On the 15M the CO trim is set through an 'Actor' in Guzzidiag after the bike has warmed up to at least 60 or 80 (I forget) deg centigrade.

Beetle, I think you are talking about the P8 ECU.

[beetle]

You're right. Brain fart. Fixed. 

[normzone]

Thank you both.   

So, this sounds as though the duration period, being digitally controlled, would nominally be a constant.

Is there a nominal that the actual can have drifted away from, or does it come to affect performance because mechanical parameters of the injection system or other system influences changed the environment by wear and tear ?

Given my afterfiring, does that indicate that the increment experiment should be minus (-) ?

Oh boy ... I did a l i t t l e search and found this.   https://www.v11lemans.com/forums/index.php?/topic/19652-v11-ecu-15rc-vs-15m/

I'm beginning to think I'm with the guy who said " give me a big carb and CDI " or words to that effect.

[Tom H]

When I was trying to fix the mess of a bike that I bought. I had issues with "pinging". With a stock map from an Australian bike (could have been the US map as well??) I needed to adjust the CO trim to completely get rid of the ping. I think I went to ABOUT +20, I need to look it up in my records to be sure. I am sure that it was not minus an amount.

You need to have your guy come by again and check the CO trim. It's easily adjusted and if you take lets say 30-40 + or - swings from zero and wait a moment, the bike will react and idle better or worse. It doesn't happen instantly, it takes a few moments. Once you have found a sweet spot on a number and the bike is idling fine, ride and see what happens. Then adjust as needed 5-10 at a time.

Looking at maps with TunerPro is way over my head as well. The graphs look pretty, but I'm fairly lost as to what they are telling me. Unless your turning a lambda off on a 15rc?, I wouldn't mess with it unless you have a desire to become Beetle!

Tom

[Chuck in Indiana]

We have played around with CO trim a fair amount on the V11S forum. The general consensus is around zero is good. Many have found values as high as -80 (!) when looking for the cause of lean stumbles, hiccups, etc. Surprise surprise. 
That said when I checked the Mighty Scura it was plus 40. (!) This bike was dyno tuned by someone that knew what they were doing many years ago, and has a Power Commander. No telling what was done, but it runs fine and gets acceptable fuel economy. (High 30s to low 40s depending on the loud handle, temp, and phases of the moon.)
I set it to zero, and it was really lean. Moved it to +20, still lean. Back to +40. I know.. not normal, but it is what works for this bike.
Back when I had the Centauro, there was a trim pot on the computer. It had a travel from 8 o'clock to 4 o'clock. 8 would return mileage in the high 20s/low 30s, 4 would make it unridable from leanness. I *think* the CO trim works much like this.

[kirby1923]

Don't know jack about the Guzzi electric carbs setup but on my beemer if the timing isn't close to spot on it will pop as you describe.

Maybe its just a cultural thing??

:-)