tanximing wrote: ↑Sat Dec 15, 2018 5:38 am I used Speeduino V4.0 ECU in my two-stroke small Engine, it works well.Please look at your available settings. In TunerStudio under Tools > Calibrate Pressure Sensors you will find the popup below. Select your barometric sensor type, input pin, and calibration points if yours is not listed. I have not used or tested baro correction for anything as extreme as your situation, nor on A-N fueling, so others may have to jump in here with information; but I believe you would also have to change the code in the sensors.h file. At 4000M on a standard day, your pressure would appear to be in the low 60s kPa, so the code section:
I have a question that can this engine work at high altitudes?The Fueling Algoritms is Alpha-N, base on TPS. How can i use the MAP sensor as a constant barometric correction sensor? I want to use this engin work in 4000m+ .
In MS1 EUC,it can set MAP sensor as a constant barometric correction sensor.
Code: Select all
would need to be changed to something lower in order to allow for that. Perhaps the mid-50s.#define BARO_MIN 87
#define BARO_MAX 108
Again, @noisymime or other code wizard will have to confirm this, but it would have to be a second sensor with current code, as the Multiply VE by MAP:Baro ratio option is a ratio of the MAP sensor value to the Baro sensor value (not simply baro value in the fuel pulse width calculation). This would mean the MAP would be connected and reading Cycle Minimum values (even if not used for A-N), and comparing them against the Baro sensor value. If there are no other responses to confirm this, then I would suggest bench-testing with the Baro sensor selected to pin A3 (MAP sensor) and apply vacuum to check the impact of the MAP sensor selected as Baro on fuel pulse-width using the Calculations.dash readouts in TunerStudios. Sorry I can't be more helpful as I have not played with the most recent changes to Baro calculations or for conditions such as yours. Please post what you find for future reference.
David