Link G4 Plus Software Tutorial: Launch Control
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Launch Control
04.05
| 00:00 | - Launch control is a motorsport function in the G4+ that can help provide consistent launches at the racetrack or drag strip. |
| 00:07 | You can access the launch control settings by clicking on launch control under motorsport in the ECU settings menu. |
| 00:15 | By default launch control is turned off so we first need to select how we want to use it. |
| 00:22 | The options are a 2D table which will let us set launch RPM versus ground speed, a single launch RPM where the launch RPM remains fixed or a 3D table where we can vary launch RPM versus two parameters. |
| 00:37 | For this example, we're going to select single launch RPM which is best suited when you're using a clutch switch. |
| 00:44 | Activation control will let us select how the launch control mode will be enabled. |
| 00:49 | We can use a digital switch for instance to turn the function on or off or we can have it always enabled. |
| 00:56 | If it is always enabled the launch control will be active continuously and this will only work if we're using speed to disable launch control. |
| 01:04 | We have a clutch switch wired to digital input four so we will select this. |
| 01:09 | If you're using a digital input to activate the launch control, the arming time defines how long the input must be active before launch control will be enabled. |
| 01:19 | In our example we'll set this to one. |
| 01:22 | This means that that launch control won't become active during a normal gear change. |
| 01:28 | If we want, we can also use a fuel trim table to adjust the fuel delivery during launch control. |
| 01:34 | This isn't necessary in most instances. |
| 01:37 | If you choose to use this table, be aware that it is an overlay table that trims the main fuel table. |
| 01:44 | Positive numbers will add a percentage of fuel while negative values will remove fuel. |
| 01:48 | Next we have our launch RPM. |
| 01:52 | This is the RPM that we want the engine to hold when the launch control is active. |
| 01:57 | In our example, we're going to set this to 5500 RPM. |
| 02:02 | Now we have the option of adding some ignition trims during launch control operation. |
| 02:08 | This can be helpful for generating boost in turbocharged cars. |
| 02:12 | It does result in explosions in the exhaust manifold which can damage your turbo or catalytic converter. |
| 02:18 | You may also have trouble if your engine has hydraulic lifters as these may pump up causing the engine to drop cylinders. |
| 02:26 | Ignition retard adjust mode selects if we're going to use a table of a single zone for the ignition retard. |
| 02:35 | For simplicity we will again choose single zone. |
| 02:38 | The ignition retard mode defines if the retard value will be applied as a percentage, degrees or degrees absolute. |
| 02:46 | We will use degrees. |
| 02:49 | Next we can choose a throttle position and RPM activation point for the trim to become active. |
| 02:55 | This helps prevent the ignition retard occurring at idle where it could cause the enigne to stall. |
| 03:01 | We're going to select 4000 RPM and 80% thtrottle. |
| 03:06 | Lastly we have the actual ignition trim that we want to apply. |
| 03:10 | We are going to use -18° for our example. |
| 03:14 | Lastly we need to set the launch control limiting mode. |
| 03:17 | In this case we're going to use ignition cut. |
| 03:20 | Once our launch control system is set up, any time the clutch is engaged, the rev limit will be reduced to 5500 RPM. |
| 03:29 | If the driver pushes the throttle down, once the RPM exceeds 4000 and the throttle exceeds 80%, the ignition will be retarded by 18° from the timing in the main ignition map. |
| 03:42 | As soon as the clutch switches off, the ignition retard will be removed and the normal rev limit will be reinstated. |
| 03:49 | The launch control function will need to be adjusted to suit your car as well as the power it makes and how much traction you have. |
| 03:57 | Launch control can damage your gearbox or drivetrain. |
