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Just thought I'd ask... What do the numbers represent?

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Discussion starter · #41 ·
mikerj said:
Did you try going below zero on the CO trim? Mine ended up very negative. My target Idle AFR was set to 14 (default for the 6105 I think) and I didn't change it.
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You are right, default is 14 in the 6105 map (and 6103 actually).

For the sake of testing, I thought I would set the CO trim to 0 first then set the target idle AFR to 13.5 and see what the result was. Then I was going to try again with CO trim to see how it affected things. Unfortunately I ran out of time.... But.. the good news is it no longer coughs or stalls with idle AFR at 13.5 which is great... It idles really evenly and I can even reliably pull away from rest without any throttle. My idle is set at a higher 1800rpm though because if you remember, one of my reasons for all this playing is that I wanted less engine braking too. However there is a downside.. it now pops on deceleration. I actually quite like it, it sounds like a race bike.. but I guess it shouldn't really do it:rolleyes:


mikerj said:
Does the Idle target AFR get updated in the ECU as soon as you change it in TuneECU, or do you have to upload the whole map to the ECU? The Idle fuel trim is a single parameter that gets updated on the fly.
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I did start to wonder if the fuel trim was 'live' so to speak, I thought it was but with not getting much change, I wasn't sure. You definitely have to save and upload the map if you change target idle AFR though.
 
Discussion starter · #42 ·
lonegunman said:
I've got TuneECU and I know how to use it. I made like five cables because the shipping was the most expensive part from Mouser, so I keep a few around. What I don't have is a CO meter or how to use it in conjunction with TuneECU. Alex gave me a rough set of numbers to hit (that I've since lost) and mentioned you can't know what the CO trim should be set to without a CO meter, and that's about as far as I've gotten.

I'm also running a TreK, not a Tornado, so Wallbro ECU... and my complaints are very few. It pops on decel a little and is has a trough from 2.5k to 4k but it goes like a raped ape from 4k to 8k. I'll probably spend some serious time mapping it but it's due for its valve lash to be adjusted and its oil changed. I'm also thinking of ceramic coating the headers *and* I'm running a TNT pipe (and may ditch the catalytic converter) so I've got all sorts of stuff to sort out.

By the bye, will this fit a TreK?

Benelli TNT Tornado exhaust headers manifolds and pipe

'cuz then I could just buy it, have it shipped to me, haul it up to the coating shop and have it sandblasted and ready to go. It'd save me two weeks of downtime...
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Well, if you are going to do some mods, I wouldn't think about playing with the mapping until its done. Just swapping my std road can for an open one had a pretty big detrimental effect on my bike's ability to run properly. All we are doing is measuring exhaust CO and playing with the 'Idle fuel trim (CO)' setting to try to achieve CO of around 3, which is supposed to give an idle mixture of around 13.5 AFR and cure the coughing and stalling issue we have on the Tornado.

If you look at post #3 on this thread > http://www.benelliforum.com/forum/tnt/14398-co2-level.html there is a table that shows CO v AFR. Unfortunately I had limited success with that setting in TuneECU. Maybe my CO meter is bad, I'm not sure, but I've kind of got where I want to be with the other Idle setting (Target Idle AFR) which I now have set to 13.5. My CO meter is reading over 6 though, so I'm starting to think its not giving me good numbers.
 
Discussion starter · #43 ·
lonegunman said:
By the bye, will this fit a TreK?

Benelli TNT Tornado exhaust headers manifolds and pipe

'cuz then I could just buy it, have it shipped to me, haul it up to the coating shop and have it sandblasted and ready to go. It'd save me two weeks of downtime...
Click to expand...
Sorry I don't know.. in theory I suppose it should since the motors are physically the same but since the trek has a different frame I'm not sure... perhaps start a new thread on that one, someone might know!
 
#44 ·
Engine load calculation

This project on Sourceforge has a very clear description of how the engine load parameter is calculated for ODB2 compliant ECUs. Basically it's the fraction of the peak airflow that the engine is currently using, corrected for temperature and atmospheric pressure. In the Nelli's case that would be determined by the TPS, RPM and the F table values, since it has no way of measuring airflow,
 
Discussion starter · #45 ·
mikerj said:
This project on Sourceforge has a very clear description of how the engine load parameter is calculated for ODB2 compliant ECUs. Basically it's the fraction of the peak airflow that the engine is currently using, corrected for temperature and atmospheric pressure. In the Nelli's case that would be determined by the TPS, RPM and the F table values, since it has no way of measuring airflow,
Click to expand...
A good find there Mike.. It finally makes a bit more sense!
 
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