Anti-Lag System (ALS)
An anti-lag system keeps a turbo spinning when the driver lifts off, so boost is instantly available again, mainly in rallying.
What is Anti-Lag System (ALS)?
It often works by retarding ignition and burning fuel in the exhaust manifold. It causes the typical bangs and flames of rally cars. It is very hard on the turbo and exhaust parts. Some road cars use milder strategies, such as keeping the throttle slightly open on gear changes.
How it works
Combustion continues in the exhaust, keeping hot gas flowing through the turbine.
Why it matters for your car
It greatly shortens turbo life. Road-legal anti-lag is rare and may break noise and emission rules.
Other terms
- Alternator Pulley (Overrunning Pulley)
- Battery Recycling
- Cooling System Pressure Tester
- CV Joint (Constant Velocity Joint)
- Driving In Fog
- Driving In Hot Weather
- E10 Petrol
- End-of-Life Vehicle (Scrapping)
- Exhaust Manifold
- Flat-Plane Crankshaft
- Hydrogen Refuelling
- Lean Mixture
- Oil Filter
- Oscilloscope
- Panoramic Roof (Glass Roof)
- Range Estimate (Guess-o-Meter)
- READY Indicator (EV And Hybrid)
- Top Speed
- Wheel Bearing
- Youngtimer (Modern Classic)