Originally Posted by scorke

When the driver lifts his foot from the gas pedal the ignition timing is altered with sometimes 40° or more of delay (retard) and the intake air and fuel supply mixture is made richer. The inlet butterfly is kept slightly open or an air injector is used to maintain air supply to the engine. This results in air/fuel mixture that keeps getting in the combustion chambers when the driver no longer accelerates. The ignition being delayed, the air/fuel mixture reaches the exhaust tubes mostly unburned. When the spark plug fires, the exhaust valve is starting to open due to the ignition delay mentioned above. Additionally, the exhaust temperature being extremely high, the unburned fuel explodes at the contact of the exhaust tubes. Luckily the turbo sits right there and the explosion keeps it turning (otherwise it would slow down since its intake, the exhaust gases, is cut-off).

Scorke

Originally Posted by S1MPSONS

It can be done with an injector in the manifold too.

Originally Posted by Maikumaru

very basically it is used so there is no turbo lag...and from launch, full boost is achieved.

fire is emitted from the exhaust because with ALS the ignition is changed so that fuel and air is ignitted in the exhaust manifold...which keeps your turbo spooling...

since it will destroy your turbo...unless you are racing your car on the track or in rallys...there is no use for it on the street...

if you want fire out your exhaust, maybe you should look at a 2 step or something like that...