No Device: scatter graphs and statistics
Road Master
Joined: Mar 2007
Posts: 1,177
Likes: 23
We really need to review the EFI fueling equation.
http://www.nbs-stl.com/MLVDemo/012%2...ngEquation.PNG
Harleys add in a couple of unique ones that are not included here but this is still the heart of all EFI tuning. It is all just math.
Andy
http://www.nbs-stl.com/MLVDemo/012%2...ngEquation.PNG
Harleys add in a couple of unique ones that are not included here but this is still the heart of all EFI tuning. It is all just math.
Andy
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Road Warrior
Joined: Mar 2013
Posts: 1,923
Likes: 587
From: Alorton, Illinois
Being that a huge percentage of tuning a Harley VE table is based on the long and short term fuel trims, the theoretical response time if the 02 sensor is almost a useless piece of data. If the trims are leaning hard on the tune, you have issues. If the O2 sensors are not in their sweet spot, you have issues.
Andy
Andy
I can't tell if he is talking in circles or into a corner.
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Road Warrior
Joined: Mar 2013
Posts: 1,923
Likes: 587
From: Alorton, Illinois
http://www.nbs-stl.com/MLVDemo/026%2...trungMotor.png
Here is a screen shot that shows some of the filters I have mentioned. It sure look neat.
Here is a screen shot that shows some of the filters I have mentioned. It sure look neat.
Thread Starter
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Road Warrior
Joined: Mar 2013
Posts: 1,923
Likes: 587
From: Alorton, Illinois
http://www.nbs-stl.com/MLVDemo/100%20Scatter%20vs%20Histogram.png
Here is a side by side pic. I prefer the histogram.
Here is a side by side pic. I prefer the histogram.
Road Master
Joined: Mar 2007
Posts: 1,177
Likes: 23
Here is the same motor logged with a PC5 with a LCD-200. No filters.
http://www.nbs-stl.com/motec/MAPxRPM...FR%20Bosch.png
Andy
http://www.nbs-stl.com/motec/MAPxRPM...FR%20Bosch.png
Andy
Thread Starter
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Road Warrior
Joined: Mar 2013
Posts: 1,923
Likes: 587
From: Alorton, Illinois
I wonder if it would look much different with filters on?
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Road Master
Joined: Mar 2007
Posts: 1,177
Likes: 23
I was shocked when I got done tuning it and then looked at the MAPXRPM vs DC. The strange part is that motor uses almost no AE. They do a fair amount of prediction. The really strange thing is if they schedule a pulse width and realize that the amount of fuel is not enough, they turn the injector back on before the next cycle.
I first found it with the PC5 data logs and the duty cycle was reporting really strange numbers.
The megasquirt programmers were intrigued by the idea when I showed them the logs.
Andy
I first found it with the PC5 data logs and the duty cycle was reporting really strange numbers.
The megasquirt programmers were intrigued by the idea when I showed them the logs.
Andy