How the Air Acoustic Control Induction System Works

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Here's how the air acoustic induction system works on your car!
In some vehicles, this system is used as a variable intake runner length or tumble flow control system in the air intake.


The air acoustic induction system on Toyota vehicles works by varying the effective length of the intake runners - longer at low RPM and shorter at higher RPM. At lower RPM, the length promotes fuel mixing, but also creates destructive interference with sound waves coming from the clatter of the intake valves. At higher RPM, it allows a direct air path to the intake, for more airflow.



On older vehicles, such as the intake shown here from a 1999 Lexus ES300, the ACIS system is controlled by vacuum actuators and vacuum switching valves. On newer vehicles, such as a Honda J series V6 engine intake, its controlled by an electric motor that moves a flap in the intake.



Newer vehicles implement clearly longer or totally separate intake paths instead of a flap in between the airflow. A separate set of valves lies at the end of the intake plenum where it mounts at the head to promote tumble flow, before air enters the valves.



As demonstrated in this video, it is important to clean your car's air intake system so valves don't get stuck causing throttle, idle or airflow issues!



You can purchase throttle cleaner here:
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(Canada)
Toothbrush to help with the scrubbing:
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3/8" drive socket set to take apart the intake:
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Angle grinder that I use:
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Screwdriver to take the intake apart:
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This is the Camera I use:
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