well its not really an issue. this is my first time dealing with s5 and i was told to remove the rats nest and do a block off plate on it. so i did. but. in the upper intake manafold there is an actuator with a large plastic sleave in it that restricts and allows more air flow.
i have no idea what to do about this. so far its unhooked from the actuator and its left open.
i was told to just run a vacuum sorce to it. but i am pretty sure that it's original vacuum sorce was from a solenoid.
what do i do about this actuator?

 

ok so i think its called the vdi.....

 

The valve doesn't actually control airflow, but changes how pressure waves bounce back and forth in the runners. It's basically like having two differently tuned manifolds in one. The valve is closed below 5200rpm and open above it, and this boosts performance right through the rev range. It's mainly responsible for the S5's 14hp advantage in peak power over the S4.

However the advice you were give. was not good. Without the solenoid valve to control it, it won't work. Vacuum won't work either, it needs pressure form the air pump, which is switched in and out by the solenoid valve under control of the ECU.

Unless you want to reinstall what you've removed and gey it working properly, you can either leave it as is it and loose performance above 5200rpm or wire it open and lose performance under 5200rpm.

 

Or you can get a cheap "lumbar" or other type of 12vdc air pump and modify it to run the 6PI and VDI like I did. There are a few writeups on here about doing it and it is pretty simple. Do a search for "electric 6PI" or "electric 6 port induction." Don't wire it open, there is no reason for it. I have had both, and working is much better than wired open.

 

use the stock ****. in my experience an electronic setup is just one more thing to break/worry about. I'm pretty sure (no s5 experience really) that you can pull the ACV and all the emissions stuff and just leave the air pump to run the VDI and 6 port actuators.

 

I should've pointed out that with no air pump and solenoid valve the 6PI system won't be working either. Between than and the VDI system the engine is probably 30-40hp down on what it would make with them working.

 

ya i figured that out myself now. i should just hook up the white clip with the solenoid and stuff. or loose 15 hp . well. does any one have a picture of these solenoids. i have the white clip. when i cut it it just fell to the ground. and i threw away the rats nest. so i need a soleniod. bleh.