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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.