Follow us on Twitter and win Autohex II Scan Tool for Kia and Hyundai (worth 945.00 USD)

Variable Intake system (VIS) changes the length of intake manifold according to engine speed and engine load to improve the power of engine through the entire range of engine speed, especially through the range of low and middle engine speed.ECM activates VIS motor’s valve to control the direction of intake air passage. At low engine speed, ECM controls VIS motor’s valve to close and the length of intake manifold comes to be longer than normal. And, at high engine speed and load, ECM controls VIS motor’s valve to open and the length of intake manifold comes to be shorter than normal.