MoTeC M1 Software Tutorial: Charge Cooling Gain
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Charge Cooling Gain
02.08
| 00:00 | For the M1 ECU to properly calculate the mass of air entering the cylinder it is critical to properly account for air density. |
| 00:08 | Air temperature is a key parameter affecting the air density and this can be accounted for to a point by the air temperature sensor. |
| 00:16 | The air temperature sensor however can only measure the temperature of the air entering the inlet manifold. |
| 00:22 | After the air enters the intake manifold it passes the fuel injectors where the fuel is injected and this fuel can have an affect on the air temperature. |
| 00:32 | When fuel is injected, the fuel absorbs heat from the inlet air as it evaporates and this affects the air density. |
| 00:40 | The air temperature sensor can’t account for this change in air density so the M1 provides a ‘Engine Cooling Charge Gain’ to accommodate it. |
| 00:49 | We can get to the ‘Engine Cooling Charge Gain’ through the ‘Initial Setup’ workbook, in the ‘Engine Details’ worksheet here. |
| 00:57 | The charge cooling gain will have a significant effect on the accuracy of the tune, so it’s important to properly calibrate this parameter early in your tuning process. |
| 01:07 | We tune the ‘Charge Cooling Gain’ by running the engine at a fixed load and rpm on the dyno. |
| 01:13 | We first want to make sure that the measured exhaust lambda accurately matches our mixture aim value. |
| 01:19 | Now we can request a change in mixture aim and watch how closely the measured lambda matches this new target. |
| 01:26 | If the measured lambda ends up richer than the mixture aim, we need to reduce the charge cooling gain and try again. |
| 01:35 | If the measured lambda ends up leaner than the mixture aim, we can increase the charge cooling gain. |
| 01:41 | Once you have the charge cooling gain close you can try moving the mixture aim up and down to confirm the measured lambda tracks correctly. |
| 01:50 | To tune the charge cooling gain accurately and achieve the best results, it’s important to run the engine with a moderate amount of RPM and load to ensure a reasonable level of airflow. |
| 02:01 | I suggest trying 3000 RPM and 30% throttle as a good place when making these adjustments. |
