Link G4 Plus Software Tutorial: Anti Lag
Watch This Course
$99 USD $49.50 USD
-OR-
Or
8 easy payments of only $6.19
Instant access. Easy checkout. No fees.
Anti Lag
06.27
| 00:00 | - One of the advanced motorsport functions included with the G4+ is anti lag. |
| 00:05 | Anti lag is used in turbocharged cars to help maintain turbo speed when the throttle is closed, reducing lag. |
| 00:13 | Anti lag will result in extreme temperatures in the exhaust manifold and turbocharger. |
| 00:18 | It requires very careful tuning and can result in damage to the turbo, manifold or engine. |
| 00:25 | Only set up anti lag if you're familiar with the system and understand the risks. |
| 00:31 | An anti lag system is more than just the software functions and will require some way of introducing extra air into the engine during anti lag operation. |
| 00:40 | This is usually achieved with either an air bypass solenoid or by kicking the throttle body open. |
| 00:47 | The anti lag parameters can be accessed through the ECU settings menu by clicking on the motorsport tab and then anti lag. |
| 00:55 | If we click on anti lag we can adjust the settings to suit. |
| 01:00 | First we need to turn the anti lag system on as by default it is disabled. |
| 01:05 | We now have a number of parameters to configure. |
| 01:09 | Anti lag system arming controls how the anti lag is activated. |
| 01:14 | We can use a switch connected to a digital input for instance or in group N applications, we can have the anti lag system remain active continuously. |
| 01:24 | The G4+ gives the option of incorporating an anti lag ignition cut table. |
| 01:29 | This table is optional and if you want to utilise it, turn it on. |
| 01:33 | ISC override can be used to force the idle speed motor to a wide open position when anti lag is active. |
| 01:40 | This on its own will not generally flow enough extra air for good anti lag operation though. |
| 01:46 | The anti lag retard mode specifies if the ignition retard table is in degrees, percentage or degrees absolute. |
| 01:54 | This has a big impact on the amount of ignition retard so it's important to understand how this will affect the final ignition timing. |
| 02:02 | Degrees will add the specified amount of ignition timing to the normal ignition table. |
| 02:07 | To retard the timing, we need to enter a negative value. |
| 02:11 | Percentage will add a percentage to the numbers in the ignition table. |
| 02:16 | Again we need to enter a negative percentage to retard the timing. |
| 02:20 | For example if the current ignition timing is 30° and the retard percentage is -100, 30° will be removed, resulting in zero degrees final ignition timing. |
| 02:32 | If we enter -200% we will end up with a timing of -30°. |
| 02:38 | Degrees absolute will result in the ignition advance in the retard table being used whenever anti lag is active. |
| 02:44 | For example if -20 is entered in the table, we will see -20° ignition advance. |
| 02:50 | Any time there is a zero in the retard table, the ignition timing will revert to the main ignition map numbers. |
| 02:58 | Next we have the AL enable RPM and the AL enable TP. |
| 03:03 | For the anti lag to become active the RPM and throttle position must exceed both of these values. |
| 03:10 | Normally these are set to a point that the anti lag won't become active during normal cruising. |
| 03:15 | The anti lag deactivation time specifies how long the anti lag will remain active if the RPM and throttle position falls outside the enable paraeters. |
| 03:25 | This ensures the anti lag doesn't remain active when you don't want it. |
| 03:30 | Five seconds is a typical value. |
| 03:33 | The cyclic idle function is useful when competition rules don't allow for an external air bypass solenoid and the throttle body is constantly held open. |
| 03:43 | Cyclic idle is used to limit engine RPM to a normal idle speed when the anti lag is not active. |
| 03:49 | If the cyclic idle is enabled, there are a few more parameters to configure. |
| 03:54 | Cyclic idle low and cyclic idle high set the throttle range over which the cyclic idle is active. |
| 04:02 | These parameters are used to smooth the transition between idle and driving. |
| 04:06 | Typically cyclic idle high will be between 3 - 5% higher than cyclic idle low. |
| 04:13 | Cyclic idle low must also be set slightly higher than the throttle opening at idle. |
| 04:18 | Typically by approximately 2%. |
| 04:21 | For example if the throttle position at idle was 20% then cyclic idle low would typically be around 22% and cyclic idle high would be around 25%. |
| 04:34 | Cyclic idle limit is the idle speed that the ECU will target when the throttle position is below the cyclic idle low value. |
| 04:43 | Advanced mode specifies whether the ECU will use the default limiting parameters or whether you wish to adjust these to suit. |
| 04:50 | If you've chosen the cool down mode you will also have a parameter called cool down time out to set how long the cyclic idle will remain active. |
| 05:00 | There are four modes for the cyclic idle. |
| 05:03 | When it's turned off it will not function. |
| 05:06 | Always on mean the cyclic idle will always be active regardless if the anti lag is armed or off. |
| 05:13 | Cool down means the cyclic idle will only remain active for a fixed time after the anti lag transitions from active to armed. |
| 05:21 | On equals system armed means the cyclic idle will only be active when the anti lag is armed. |
| 05:29 | The G4+ allows two sets of tables to be used for the anti lag parameters. |
| 05:34 | This can be used to provide a mild and aggressive anti lag setup that can be selected using a digital input for example. |
| 05:41 | The dual tables menu lets you select how the dual anti lag tables are enabled if you wish to use them. |
| 05:49 | Lastly we have the anti lag ignition retard, anti lag fuel and anti lag cut tables. |
| 05:56 | These can be adjusted to give the desired anti lag performance. |
| 06:00 | It's important to understand that all of the anti lag tables are overlaid on top of the normal fuel and ignition tables. |
| 06:08 | You don't need to actually tune every zone in these tables but rather just the areas where the anti lag is effective which are normally down at low throttle openings. |
| 06:17 | If there is a zero in any of the anti lag tables the engine will run with the normal fuel and ignition from the main table. |
