Yea I am just going to run a single on the Y pipe. I saw that USP motorsports did it that way too and they are running some good times, haha. Just waiting to hear back from my tuner about which spring to run.

 

I have two samco DV's that I have venting to atmosphere. They make a significantly loud WOOOOSH sound when they blow-off. I'm not using the OEM piping that connects the bottoms of the DV's to the intake to the turbos (Usually when the vaccum opens the DV's the air is dumped back into the plenum going to the turbos. I have the hole plugged.

I have the n75 that controls the valve deleted with my mafless tune. I just let the car's vaccum open the valves. Usually there is a vaccum hose that goes to the bottom of the n75 (the one near the diverters) but I have that hose now connected directly to the top of the DV's. They open when the car goes into vaccum (on shift, lift, etc...)

Let me know if you want some more info.

 

Where do u have the DV's sitting?

 

On the stock fhose location. I do have a silicon fhose though.

 

The hose you are mentioning, going to the bottom of the valve, is going from pressure to vaccum, according to manifold pressure ?

But... I have been reading somewhere around here :
The top inlet pressurizes the DVs thru the check valve.
DVs are connected to the mid connector.
Bottom is connected to the 4-way connector = vacuum.
Confusing, isn't it ???

I thought the top one, connected to manifold but without the check valve, would be perfect to do the job.

 

Actually your N75 is a N249. N75 is the one used for wastegate control. Using "only" the vacuum behind the TB to open the valves does work, but on quick gear changes or generally when you lift the throttle, you will see boost spikes before the TB.

The N249 is controlled by the ECU to prevent just that. Negative pedal gradients above a threshold are detected and the valves open with the help of the vacuum reservoir before the throttle plate is shut and hence the boost spikes are prevented and your turbos are happier.