VR30DDTT - Rolling Anti-lag / Rolling Launch

The Antilag feature is designed for roll racing. It is similar to the Rolling Launch feature in our GTR product.  The objective is to spin up the turbo and create a reserve of boost in anticipation of rapid acceleration.

1. Ensure the cruise control system is deactivated.

2. While driving forward press and hold the cruise control "Set/-" button, you can adjust the speed by modulating the accelerator. Increased input will demand slightly higher torque and allow subtle acceleration and vice-versa.

3. When the driver wishes to launch simply release the cruise "Set/-" button.

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While activated, the Antilag feature selects a boost target (default 1.8bar) and applies closed-loop ignition retard to generate more exhaust gas energy and help maintain that target.

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Best results can be achieved by manually selecting a suitable gear prior to activating the feature, if used in auto, the accelerator pedal input will cause a downshift.

Tuning Rolling launch will require adjustment of the setting from the base maps to suit the particular vehicle. the maps you will need to adjust for any car are as follows

• Enable AntiLag map, check the modes you want it active and if you want to use the overrides

• AntiLag Torque Base map, raise this to keep the throttle open

• AntiLag Ignition Timing Base Map, lower / adjust this to create heat to make boost

• AntiLag Ignition Ramp Rate - increase this to allow the timing to ramp in correctly

There are 5 logging parameters for the anti lag system, there allow the tuner to check what is happening before during and after the AntiLag system is being used.

these are the bits that tell you what phase of the the AntiLag function is under operation at the present time, these values are added onto each other top show the current status, e.g. 1 + 4 +8 = 13 = AntiLag enabled in the map switch mode, the EGT and ECT temperatures are OK to do ALAG

When AntiLag is active the sum should be 63 (1 + 2 + 4 + 8 + 16 + 32 = 63)

the Ignition timing sent from the timing functions to be processed by the AntiLag function

The ignition target from the Retard maps.

The timer before the AntiLag function can be used again

The length of time AntiLag has been active

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Switch that activates AntiLag system per map switch mode.  Also provides the option to force the minimum ignition maps to the ALAG target meaning you don’t have to change the min ignition tables and also the ability to override the Torque demand and actual values sent to the transmission over can to lock the torque converter up and maintain line pressure.

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Establishes a boost the ECU will attempt to achieve while the anti-lag system is active.  The four settings are for the 4 map switching modes.

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Sets a Maximum (high) temperature the engine coolant temperature must be below in order for the AntiLag system to engage.  Since this system can cause an increase in coolant temperature it's a good idea to keep this at a reasonable level to prevent overheating or engine damage.

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Sets a minimum (low) temperature the engine coolant temperature must be above in order for the AntiLag system to engage.  Keeping this to a sane value ensures that the car is up to proper operating temperature before using engaging the system.

Sets a Maximum (high) temperature the exhaust gas temperature must be below in order for the AntiLag system to engage. Because this system can cause an increase in temperature as a result of using the AntiLag feature it's important to keep the exhaust gas temperature to a safe temperature to avoid damage to engine components.

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Establishes the rate in degrees of ignition timing the system will alter ignition timing over a period of time. This value may need to be increased to allow the ignition to drop fast enough to make the launch timing correct.

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Base values the system will use to alter ignition timing when the system is activated.  These are adjusted over time by the ramp rate and the AntiLag Ignition TIming Proportional in order to hit the desired boost level.

The change to existing ignition timing after the AntiLag Timing Base values are applied that the system will utilise in order to correct for boost error (failure to meet or maintain the AntiLag Boost Target)

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The fuel target the AntiLag system will use while the AntiLag system is active.

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In order to prevent heat buildup or damage we recommend not using the AntiLag system continuously without allowing the engine to properly cool down in between.  This value sets an amount of time that must pass before the system can be activated again.

This either begins after AntiLag was just used, or if the system shut it down due to the AntiLag Timeout value being exceeded.

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Amount of time the AntiLag system can be active before shutting down.  An important value as the system generates a lot of heat in the turbocharger and exhaust which can be damaging.

These values will need to be adjusted from the default value to request enough torque to build boost and open the throttles.

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Adjustment to the torque request based on gear.  Important to maintain speed as higher gears will require more torque in order to keep the same amount of speed.

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Works in conjunction with the AntiLag Torque Base table.  Applies a multiplier to that value to adjust for the added torque required at higher vehicle speeds to maintain speed when the system is active.