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https://www.cajinnovations.com.au/forum/YaBB.pl MyECU >> Getting started with MyECU >> map questions. https://www.cajinnovations.com.au/forum/YaBB.pl?num=1275602433 Message started by Cristiano on 06/04/10 at 08:00:33

Title: map questions.
Post by Cristiano on 06/04/10 at 08:00:33

Hello everyone,
I have got a Breva 750 with My15M. Everything sounds good and starts well (just set TDCWhileCranking=0 and decrease prime values),
BUT i don't undestand some things in the Cliff's map:

I have a narrowband o2 sensor

Code:

MyECU Cfg O2=0.00V,0.60V,0.70V,0.75V,0.80V,0.85V,0.90V,0.95V,
# 0 = None, 1 = Inp1, 2 = Inp2, 3 = Both
MyECU Cfg O2Sensors=1

why the second value starts from 0.60, what they rapresent? I thought the right stoichiometric output voltage value was close to 0.50V ,
and how are they link with the bottom of the map?

Code:

RPM 500 1100 1500 1801 2000 2302 2601 2900 3360 3654 4045 4655 5353 6157 7082 8143
Flags 14 (O0) (O6) (O6) (O6) (O6) (O6) (O6) (O6) (O6) (O6) (O6) (O6) (O6) (O6) (O6) (O6)
Flags 13 (O0) (O6) (O6) (O6) (O6) (O6) (O6) (O6) (O6) (O6) (O6) (O6) (O6) (O6) (O6) (O6)
..................
............
......

Thanks.

Title: Re: map questions.
Post by raz on 06/04/10 at 08:19:22

O6 would be the seventh value (O0 is the 0.0V) so your actual target is 0.90V.

I have never used a narrowband sensor but I do know that you can't run a bike on stoich. I currently use Lambda 0.94 (AFR 13.8) as my leanest target, on low load cruising. My richest target is 0.88, or an AFR just below 13.

For a while I used 0.96 (AFR 14.1) as my leanest target and it made no harm to the engine but it also did not save any noticable amount of fuel and the bike was very picky about gas quality. I believe going leaner than that could be dangerous to the engine.

Title: Re: map questions.
Post by YaBB Administrator on 06/04/10 at 08:33:28

0.5V may well be Stoic for a narrow band but there are a few differences.
Firstly, I'm not sure the standard sensors used by Guzzi are like the cheap narrow-band sensors. They seem to have a bit more range.
2ndly for narrow-band sensors the transition is so quick you would not notice much difference from 0.2V to 0.7V anyway.

Title: Re: map questions.
Post by greenmonster on 06/04/10 at 10:32:51

Quote:

I have a narrowband o2 sensor

Quote:

2ndly for narrow-band sensors the transition is so quick you would not notice much difference from 0.2V to 0.7V anyway.

Fr what I understand, those sensors are worthless f tuning.
Normally, they control the low TPS from idle to around 4500 RPM circuit f low emissions etc.

A wideband sensor is necessary f good tuning.