ACIS MOD FOR TOYOTA V6
Q: What is the ACIS mod? What engines does it apply to? How do you do it?
A: This mod is meant for the 3VZ-FE engine, but may apply to 1MZ engines too.
Basically, the ACIS is a valve powered by an actuator operating by vacuum pressure that closes when engine revs past 3900 rpm to give better high end power. When it's open, it theoretically gives more low end torque, but the 3VZ-FE engine is already very torquey.
Furthermore, when the valve is open, the air is very turbulent and may actually limit airflow. So by making the ACIS close early, it will allow the engine to produce a smoother powercurve delivering peak power sooner. More power under 3900rpms and 50%+ TPS. It may be even more noticeable if you did some intake porting.
Link for How To:
http://www.automotiveforums.com/vbul...d.php?t=399112
After several trials, I noticed that only the plug on top of the throttle body that's closest to the driver seat provides enough vacuum to shut the ACIS at 1200-1500rpms. The lower vacuum plug shuts ACIS at 3500rpms.
Thanks sanengo!
Here's further clarification from Toysrme:
Better pics than copying my old setup is me correcting someone else's attempt. What we are doing, is plugging the ACIS Actuator into the E-vacuum port on the throttle body. This way, instead of the nasty ECU programming controlling the ACIS valve (>4000rpm, >/= 50% TPS, the car must be moving). It will open any time the throttle plate is open, and at any rpm. They should snap shut around 1250-1500rpm.
You can get small plastic T's at Wall-mart fish section. About 50 cents for a two pack.
This will improve the power around the 2000-4000rpm band.