Dann Posted March 22, 2008 Share Posted March 22, 2008 I had my Plenum off my N/A off today to polish it up, then I noticed inside the plenum what seams to be another throttle body that works off a vacume. Why? Whats it for? Can I remove it ? What will happen if I do ? Thinking it might be some sort of restricter of somekind or a power valve of some hight tech sort. Your thoughts on this please Dann Link to comment Share on other sites More sharing options...
Nic Posted March 22, 2008 Share Posted March 22, 2008 Thinking it might be some sort of restricter of somekind or a power valve of some hight tech sort. Correct, there is a valve in the 2JZGE intake that opens at higher rpms. Toyota call it the Acoustic Control Induction System (ACIS), it varies the length of the intake system to maximise low down torque and upper end power. Link to comment Share on other sites More sharing options...
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