I believe that I have a JDM UIM but this is how I have the setup currently, is this correct?



Its an S4 car with S4 electronics (my 10AE) rats nest/emissions removed (still running BAC) running a S5 turbo & S5 intake/exhaust manifolds. Do I still need that switching solenoid? is that only applicable to the s4?

I feel like I am missing something...

EDIT: its the wastegate control system I am missing. Should I be following the S4 or S5 method for this?

Do I just put a plug on this port circled in yellow and call it a day? (s5 turbo on s4 engine)



because this line goes right from the wastegate to the compressor housing. Do I need to mess with the switching actuator anymore for the s4 twin scroll? I know the s5 has electronic boost control solenoid so I'm at a loss on how to plumb this.

 

That little vacuum nipple for the wastegate can be plugged, or if you choose to run the factory solenoid, you would run a line from that port to the solenoid, and then to the pre-turbo intake.

 

But I don't have a factory boost solenoid since its an S4 car. This would be the case for an S5.

I'm gonna plug and see. Right now I am waiting on the mail to deliver the 120mm bolt I managed to forget for this swap as well lol

 

Just to clarify some names with what they're called in the manual:
The switching solenoid is part of the secondary air injection system and sends vac to the ACV. Plug the nipple at the UIM since you're not running emissions.
Twin scroll is an S4-only function and different from the wastegate. Plug the nipple at the UIM.
Factory boost control solenoid is S5 only. Plug the nipple on the tube between compressor housing and wastegate. If you're interested, the original routing goes: yellow circled nipple -> solenoid -> vented/wastegate (depending on signal from ecu and boost sensor)

 

You'll be fine. If it bothers you enough, you can eliminate that little tube and just run a line from the compressor to the wastegate. If you want to keep it, you can plug it or use it later to add more boost.

 

Makes sense. Looks like I'm good to go then!

I think prior to my manifold swap I had left the twin scroll system hooked up causing a vacuum leak because I was using that port on the compressor housing. it was a leak I could not find with carb cleaner so it was an "internal leak" so to speak.

 

Yup - that took care of it - adjusted the new throttle/TPS runs great.