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Antilag
⚠️ DANGER — competition-only feature. Read this before enabling.Anti-lag deliberately keeps combustion energy high in the exhaust so the turbocharger stays spooled while you are off the throttle. This produces very high exhaust and turbocharger temperatures, heavy mechanical and thermal stress, and loud backfires. It can shorten the life of, or destroy, the turbocharger, exhaust, valves, and catalytic converter, and it is not emissions-legal.
It is intended for closed-course competition use only, on engines and turbochargers specifically built and prepared for it. Do not use it on the street or on hardware that is not prepared for it. Introduce it gradually, monitor exhaust gas temperature (EGT) continuously, and verify behaviour on a log. Use at your own risk.
Anti-lag (also called ALS, anti-lag system) reduces turbo lag by keeping the turbocharger spinning while the engine is off the throttle, so that boost returns almost immediately when you get back on it.
The overall feature is turned on with antiLagEnabled. When and how it runs is set by antiLagActivationMode, which offers three options:
-
Switch Input — activated by a driver-operated switch wired to the
ALSActivatePininput. - Always Active — runs whenever its configured conditions are met.
- Lua — activated from a Lua script, for custom activation logic.
The timing, fuelling, and the RPM and throttle conditions that anti-lag uses are configured in TunerStudio. Set them conservatively, watch EGT closely, and confirm the behaviour on a log before relying on it.
- Launch Control — often used together with anti-lag.
- Boost Control
- Lua Scripting — one of the anti-lag activation modes.
- Logging Guide
- Configuration field definitions:
firmware/integration/rusefi_config.txt—antiLagEnabled,antiLagActivationMode(Switch Input / Always Active / Lua),ALSActivatePin.
