Hi everyone, can someone help me configure the fuel cutoff when you take your foot off the accelerator?
Here’s my configuration, I’m not sure if it’s correct here.
Thanks
Fuel cut can activate when RPM>2800, TPS <= 0 and MAP <=15kPa.
I think the 15kPa is too low. Few engines can pull such high vacuum.
You could make a datalog of a 6500-2700rpm run down. Take the highest MAP value, add 10kPa and use that as the fuel cut under pressure.
My engine is set up as Alpha-N and does not use MAP, adjustment by TPS. Another question is that I have a lambda sensor and there is a target, how do I know if it is making automatic corrections? Thank you.
The EMU will still check MAP value to activate the overrun. Atmospheric pressure reads about 100kPa so overrun will not be allowed if you set the limit to 15kPa. Just set the value to 200kPa and the overrun will work in Alpha-N
There are log channels that show the amount of correction applied. I think in V2 software it is called “EGO Correction” and in V3 software it is “Short term trim”.
This needs to be tuned with consideration given to your idle control parameters.
Idle settings will over ride your fuel cut settings in some situations.
With regard to your automatic lambda corrections, this only works if Fuel/Short Term Trim is enabled. If enabled, this also requires tuning.
Yes it is, if, when you say ‘lambda correction’ you mean closed loop fuel control, or Short Term Fuel Trim.
Successful adjustment of these parameters requires a good understanding of PID Control or you may have frustration with fuel oscillations.
Its also critical that you have accurate Injector characterisation (Injector Flow and Injector Dead Time Calibration) for any fuel compensations to be reliable.