Link G4 Plus Software Tutorial: Individual Cylinder Fuel/Ignition
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Individual Cylinder Fuel/Ignition
03.48
| 00:00 | - In most cases, you'll be able to do a great job of tuning just about any engine with just the main fuel and ignition tables. |
| 00:07 | In some cases though, you may want to adjust the fuel or ignition timing for individual cylinders. |
| 00:12 | The G4+ gives two options for doing this. |
| 00:15 | Let's look at the individual cylinder fuel correction as an example. |
| 00:19 | If you press the escape key to bring up the ECU settings menu and click on fuel, you will see the individual cylinder fuel correction option. |
| 00:28 | Clicking on this will expand the menu to show you the options. |
| 00:32 | First we have the mode which you want to use. |
| 00:35 | By default the ECU has individual cylinder trims for both fuel and ignition turned off. |
| 00:40 | If we click on this we have two options, single or table. |
| 00:45 | Single mode will give you a 2D table which lets you enter an overall trim for each cylinder. |
| 00:52 | This trim will be applied as a percentage regardless of the load the engine is seeing. |
| 00:56 | This is the most common way of using individual cylinder trimming and will be adequate for most applications. |
| 01:03 | Table on the other hand will give a 3D table for each cylinder. |
| 01:08 | This table can be configured in the same way as the main fuel table and allows the trim to be adjusted based on RPM and load. |
| 01:15 | Again the trim is a percentage change applied to the main fuel table. |
| 01:20 | Let's look at the single mode first. |
| 01:23 | If we click on single, a window will pop up warning that this setting is for experienced users. |
| 01:29 | If you are happy to continue, press yes. |
| 01:32 | We now have access to the individual cylinder fuel trim table. |
| 01:35 | Double clicking on this will open it so we can make changes. |
| 01:40 | You can see that a 2D table opens up with the engine cylinder on the X axis. |
| 01:46 | We can select the cylinder we want to trim and make the appropriate changes. |
| 01:50 | Setting up the table option is a little more complicated. |
| 01:55 | If we go back and select the table option, we need to allocate each cylinder to a specific table in the ECU. |
| 02:02 | For example, if we have a four cylinder engine, we would normally allocate each cylinder to its own table. |
| 02:10 | I'm going to work through this now so you can see how it is done. |
| 02:15 | When we select the fuel trim table, a window will pop up asking if you want to clear the table and set the axis to the default values. |
| 02:22 | Click yes. |
| 02:24 | Continue for each cylinder in order. |
| 02:26 | While normally we would give each cylinder a separate fuel trim table, you could however allocate a number of cylinders to a single trim table. |
| 02:34 | This could be useful on a V configuration engine where the left bank of cylinders and right bank of cylinders can be allocated to just two tables. |
| 02:42 | This would let you quickly and easily make adjustments to an entire bank from one table. |
| 02:46 | Once each table is configured, we can access them through the ECU settings menu. |
| 02:51 | If you bring up the ECU settings menu and click on fuel, you can now see we have the four individual cylinder trim tables available. |
| 02:59 | Before we make any changes, we will usually want to make sure that the load axis is the same as our main fuel table. |
| 03:05 | You can also adjust the resolution and cell sites to suit the areas you want to trim. |
| 03:11 | Once the tables are completed properly, you can make the changes you want. |
| 03:15 | Again, the trims are a percentage that is applied to the main fuel table. |
| 03:20 | Individual cylinder trimming is an advanced function and requires either exhaust gas temperature sensors or individual cylinder lambda probes to tune properly. |
| 03:30 | The options for individual cylinder ignition correction match the fuel correction options and can be configured in the same way. |
| 03:37 | The ignition tri however works on degrees of ignition timing, rather than a percentage trim. |
