Lambda readings - with picture!

[Roundabout-Now]

Now my brain is starting to overheat trying to figure out lambda and afr - I understand the theory but after that I seem to have read so much information that its starting to get confusing.

Looking at the pretty picture above - between 3.5k and around 4.5k under load I\'m running very rich I think. Am I reading it right? I\'m presuming the reading on the left is lambda and not a voltage reading (in which case its lean across the board?):confused:

[ianelvar]

Hi

It looks like a Lambda reading to me.

I\'m not an expert, but I did a lot of reading on this while I was playing with megasquirt last year. Hope this helps..




   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   

Lambda	AFR
0.686	10.08
0.696	10.23
0.706	10.38
0.716	10.53
0.727	10.69
0.739	10.86
0.75	11.03
0.762	11.2
0.774	11.38
0.787	11.57
0.8	11.76
0.814	11.96
0.828	12.17
0.842	12.38
0.857	12.6
0.873	12.83
0.889	13.07
0.905	13.31
0.923	13.57
0.941	13.84
0.96	14.11
0.98	14.4
1	14.7
1.037	15.25
1.078	15.84
1.121	16.48
1.169	17.18
1.22	17.93
1.276	18.76
1.337	19.66
1.405	20.66

Sorry for the dodgy HTML, it\'s the only way I could get it to display nicely in a table format.

Regards

Ian

[ianelvar]

No idea why it\'s lumped all that space in at the top :3Confused  Sorry guys. Hope the info is helpful, though

[BlitzBoy]

170 KPa is this your boost pressure, is KPa Kilopascal? if so thats 24psi!!

[Roundabout-Now]

No - that includes atmosphere of 100Kpa, so that is at 70Kpa boost (around 9/10 psi)

[monkey-fd3s]

In your output the motec interpreter gives a plot of lambda against rpm

10.69/10.53 = 0.72 which is a little rich but it\'s better to start off rich and then work down rather than lean it out...