I would like to start a thread on tuning of electronic fuel injection systems such as EFII or SDS. I have an EFII system and I am assuming that my questions below would be applicable to SDS as well.
Let me start by saying that I DO NOT WANT THIS TO BE A THREAD THAT BASHES ANY ONE OF THE SYSTEMS! There are several us out there that want to have a communal discussion on the various strategies around tuning the systems without all of the drama that has derailed other threads in the past.
I have an O2 sensor installed and I initially optimized the fuel flow at each RPM setting based on the air/fuel ratio readings.
With that all done, here are my questions to the group to see how you might have addressed it.
1. When I take off at 2600 rpm, my engine is developing good power but after about 30 seconds my CHT climb to 425 very quickly and keep climbing if I do not richen the mixture significantly. After I richen it, the aircraft still climbs well so I leave it there. Do others just program the ECU to richen the fuel mixture every time the engine is operating at 2600?
2. I cruise at 2300 rpm at 25 Hg and lean the engine aggressively. I am seeing 170 mph at 7.5 gph with CHT's at 380 or below. My typical practice is once I am configured for cruise, is to manually lean the mixture with the electronic knob. Then I have to return it to "normal" for the decent. Should I tune the engine to run this lean automatically at 2300?
3. When I am in the pattern and cross the number on the downwind leg, I will pull the power to idle and get some popping in the exhaust. If I richen the mixture, the popping with stop. I have been adjusting the MAP curve to richen the mixture as the MAP goes down but my plane in getting painted right now and I have not finished working it out yet. How has that worked out for others?
These are the issues that are affecting me directly at the moment. I am looking for how others have addressed these issues and would like to discuss issues that others are having. Might be something that I have not thought of yet.
Let me start by saying that I DO NOT WANT THIS TO BE A THREAD THAT BASHES ANY ONE OF THE SYSTEMS! There are several us out there that want to have a communal discussion on the various strategies around tuning the systems without all of the drama that has derailed other threads in the past.
I have an O2 sensor installed and I initially optimized the fuel flow at each RPM setting based on the air/fuel ratio readings.
With that all done, here are my questions to the group to see how you might have addressed it.
1. When I take off at 2600 rpm, my engine is developing good power but after about 30 seconds my CHT climb to 425 very quickly and keep climbing if I do not richen the mixture significantly. After I richen it, the aircraft still climbs well so I leave it there. Do others just program the ECU to richen the fuel mixture every time the engine is operating at 2600?
2. I cruise at 2300 rpm at 25 Hg and lean the engine aggressively. I am seeing 170 mph at 7.5 gph with CHT's at 380 or below. My typical practice is once I am configured for cruise, is to manually lean the mixture with the electronic knob. Then I have to return it to "normal" for the decent. Should I tune the engine to run this lean automatically at 2300?
3. When I am in the pattern and cross the number on the downwind leg, I will pull the power to idle and get some popping in the exhaust. If I richen the mixture, the popping with stop. I have been adjusting the MAP curve to richen the mixture as the MAP goes down but my plane in getting painted right now and I have not finished working it out yet. How has that worked out for others?
These are the issues that are affecting me directly at the moment. I am looking for how others have addressed these issues and would like to discuss issues that others are having. Might be something that I have not thought of yet.