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MoTeC M1 Software Tutorial: Fuel Mixture Aim

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Fuel Mixture Aim


00:00 Since tuning the M1 relies heavily on the Fuel Mixture Aim table, this is a reasonable place to focus on first.
00:08 We can get to the fuel mixture aim table from worksheet three in the Tuning workbook.
00:13 The first component we will look at on this worksheet is the ‘Fuel Mixture Aim Main Table’ which we can see here represented in both table and graphical form.
00:24 Notice that this is a 4D table with a separate Mixture aim table available for Driver Switch Position A and B if you are using a Driver Switch input.
00:34 While MoTeC have always worked in units of lambda, if you prefer to use units of AFR you can do so by right clicking on the Fuel Mixture Aim table and selecting ‘Active Item’ and then ‘Properties’.
00:46 Under display you can choose your preferred units from the drop down menu.
00:51 If we select ‘Gasoline AFR’ for example and press OK, you can see the table values switch to AFR.
00:59 If you want to make this change you will need the layout unlocked as we have already discussed.
01:05 To keep everything simple I’ll switch back to units of lambda, but you can use this same technique to change any of the other units such as temperature or pressure if you wish.
01:15 So what we want to do with this Fuel Mixture Aim table is simply enter the lambda values that we would like the engine to operate at, at each combination of load and rpm.
01:26 It’s important to be thorough here and we will be using this table as a reference when we are tuning the engine.
01:32 One of the advantages with the VE fuel model is once we have correctly calibrated the efficiency table, if we decide we want to make a change to the target mixture, we can do so by just adjusting the Fuel Mixture Aim table and we don’t need to retune the engine.
01:49 If you need to adjust the load or rpm sites, this can be achieved as we have already seen by pressing the ‘A’ key to access the Axis Setup Screen.
02:00 If we close down the main fuel mixture aim table, you can see to the right that we have some miscellaneous fuel mixture aim tables too.
02:08 These can be used to target different aim mixtures depending on operating conditions.
02:14 The way the M1 works is that it will always target the richest of any of the fuel mixture aim tables at any time.
02:21 That’s why you can see predominantly most of these miscellaneous tables are set to two point zero which effectively means they will never influence the actual Target Mixture.
02:32 If we click on the ‘Coolant Temperature Fuel Mixture Aim’ parameter, you can see we have a 2D table which allows a richer mixture to be targeted during warm up.
02:42 This isn’t to be confused with warmup enrichment though as the engine will almost certainly require more fuel to achieve the fuel mixture aim when the engine is cold, than when it is at a normal operating temperature.
02:55 This table works in conjunction with a fuel compensation table that we will look at a little later.
03:01 Another table that is worth discussing is the ‘Inlet Manifold Temperature Fuel Mixture Aim’ table.
03:08 This isn’t to be confused with an inlet air temp compensation table that we might see in a traditional ECU.
03:15 That sort of table is included to keep the fuel mixture consistent as temperature changes, and in the M1 this is actually done in the background.
03:24 What this means is that the M1 should retain a consistent mixture regardless of air temperature.
03:32 This particular table can be used if perhaps you want to start moving the mixture richer at very high air temperatures for example to add a safety margin.
03:41 Those sort of changes can be targeted here.
03:46 If go back to a full screen display, we also have the option to trim the fuel mixture aim based on a multi position switch if one is fitted.
03:56 This particular adjustment is a percentage change, rather than an actual mixture aim so it will be applied to whatever the current mixture aim is.
04:06 Before we get into tuning, it’s important to go through each of the Mixture Aim tables and make sure the values are suitable for your particular application and what you want to achieve.

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