The naturally aspirated 2jz-ge engine features a secondary flapper in the intake manifold plenum. It close for long runner feature at low rpms = torque and closes (I think that is how it works) at higher rpms. I think you guys know I'm pressurizing this system. My question is, Would I benefit by removing this? In the keep it simple approach, this seems to me (ACIS that is) to be a hyped up gimmik providing restriction to flow on boosted apps.

Thoughts?


http://www.supraforums.com/forum/sho...stic+induction

 

i would love to know as well.

but the simplest thing to do, is dyno before, and after with it open. it will take no more than 45 minutes to get in there, and remove it.

good luck.

btw: i recall some is guys, removed it, and they indicated they felt more power. i would do a search over on is300.net too.

 

found the link
http://www.is300.net/forums/showthre...utterfly+knock

 

Excellent info. The damn things causes a knock. It's out. Makes sense. I have two manifolds. I'll modify one and leave the other. Maybe get a pull with each this spring.

 

Ya I am not too sure about the GE's, but I know in different cars people remove these systems when installing turbo's. One example is the mazda 2.5L KL engines.