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MoTeC M1 Software Tutorial: Quick Lambda Function

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Quick Lambda Function


00:00 Quick lambda will be a familiar concept to those who have tuned any of MoTeC’s previous range of ECUs.
00:07 Quick lambda is used to help speed up tuning the Engine Efficiency table, by comparing the measured exhaust lambda value with the Aim Mixture table value for the particular site the engines operating in.
00:20 To use the Quick Lambda function, the M1 ECU will need a lambda sensor input which can come from either a MoTeC PLM or LTC and we will look at configuring these later in the course.
00:34 Provided the ECU is receiving a valid lambda input, pressing the ‘Q’ key while navigating the Engine Efficiency table will automatically adjust the efficiency value in the site closest to where the the engine is operating.
00:50 The Quick Lambda function is a great way to speed up tuning on the road or dyno as you can simply drive the engine through the various sites in the Engine Efficiency table, hold the load stable in the centre of a site, press Q to automatically adjust the efficiency, then you can move on to the next site.
01:10 If you pause the time graph and move through some recorded data, you can also use the ‘Q’ function here.
01:18 You can simply select a point on the time graph, press Q, and the ECU will perform the Quick Lambda function on the site closest to where the engine was operating at the time.
01:29 This is a fast way to accurately fine tune the Efficiency table based on recorded data from a dyno run for example.
01:36 While the ‘Q’ key will tune the site closest to where the engine was operating, alternatively you can also use the ‘W’ key which will achieve the same aim, but it will also tune the adjacent sites in the direction of increased load and increased RPM.
01:53 This will help have the lambda closer to being correct when you increase either the load or RPM and move through the table.
02:02 The ‘W’ key can help avoid the engine running excessively rich or lean as you move into untuned areas of the Efficiency table.
02:10 If you are tuning the engine with closed loop fuel control active, then your measured exhaust lambda will probably match your Fuel Mixture Aim, as the closed loop control will provide a trim to make any necessary correction.
02:24 This doesn’t mean your efficiency table is tuned correctly though.
02:28 You can still use the quick lambda function with closed loop enabled.
02:33 When you press the Q key, the ECU will apply the current closed loop trim to the value in the efficiency table and then zero the closed loop trim. We will look at closed loop fuel control in more detail later in the course.
02:49 If you are making changes to a package based on data logging, you may want to use the ‘Lambda Was’ function.
02:57 This works in the same way as the Quick Lambda function, but we need to enter the measured exhaust lambda from the correct point in the log file.
03:06 We can use the Lambda Was function by navigating to the correct site in the Efficiency table and pressing L.
03:13 This opens a box where we can enter the measured lambda value as well as our target Fuel Mixture Aim.

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