MoTeC M1 Software Tutorial: Engine Efficiency Calibration
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Engine Efficiency Calibration
02.57
| 00:00 | Now that the ECU is configured completely we can actually perform some calibration, and this is achieved through the ‘Fuel’ worksheet. |
| 00:08 | The aim here is to adjust the efficiency table until the measured Exhaust Lambda matches the Fuel Mixture Aim at each point in the efficiency table. |
| 00:18 | Tuning this table is no different to tuning the fuel table in most ECUs and depending on your preference you can manually adjust the efficiency numbers or use the Quick Lambda function to automatically correct the efficiency value. |
| 00:32 | When tuning this table, I prefer to view the table both graphically and numerically so you can visually get an indication of your progress and start to build an idea of the shape of the engine’s volumetric efficiency map. |
| 00:45 | This can quickly highlight any potential problems you have in either the configuration or your calibration as the efficiency map should maintain a reasonably smooth and consistent shape without large or significant peaks. |
| 01:00 | When I’m tuning, I tend to make use of the Time Graph element and more specifically you can see in the time graph we have the components ‘Exhaust Lambda’ and ‘Fuel Mixture Aim’ displayed in a single group. |
| 01:12 | This is the place to monitor how accurate your calibration is, and what changes need to be made. |
| 01:19 | Of course if you prefer you can add a numerical display for both Lambda and Mixture Aim if this suits you better. |
| 01:27 | Steady State tuning is one way of filling in the efficiency table, but we can also use the time graph and make changes based on the data recorded during a ramp run on the dyno. |
| 01:37 | If you pause the time graph, you can track back through the run and you will see a log of measure lambda versus mixture aim. |
| 01:45 | As we move the cursor through the time graph, a ghost cursor will be displayed on the efficiency map showing where the ECU was operating at that point in the log. |
| 01:56 | We can use this to make fast and accurate changes to the efficiency table based on any lambda errors. |
| 02:03 | Again this can be done manually or we can press Q to use the quick lambda function. |
| 02:10 | If during your tuning you find that the efficiency table may benefit from adding some additional sites, perhaps in an area where the engine moves through a large VE change in a short period of time, we can do so through the axis setup menu. |
| 02:25 | Let’s say for example we want to add an rpm column at 5250 rpm. |
| 02:31 | We can press ‘A’ to open the axis setup menu and insert a site at 5250 rpm. |
| 02:38 | When we press OK, the ECU will automatically interpolate the values in the new column so that they are correct. |
| 02:46 | If you run the engine now, the measured lambda will not be affected but we now have the ability to adjust the efficiency in these new sites to achieve our desired target. |
