when hooking up a dual port wastegate where does the secondary port get vac signal from, the intake manifold right?

i have the blitz sbd-ic and i intercept the signal from the manifold already to to the wastegate, i have a forged actuator that has 2 ports, i want to run it as a dual port wg to see if that will help the boost stabilize some.

if thats the case, arent the vac lines fighting each other?

 

Mine got it from the throttle body tube I'm pretty sure.

 

The lower port on the WG will get the signal from the intake plenum or compressor discharge of the turbo. It will also be tee'd into the the line that runs to the "in" port on the boost solenoid.The "out" of the boost solenoid will run to the top port on the wastegate.Now this is typical for external wastegates.The internals dual ports should be the same but it is best to check with the manufacturer first.Make sure you verift your settings withthe Blitz ID.There is a mode that does not work with twin turbos and if you have it set in that particular mode, your boost will come in real slowly and make your car feel more like a centrifugal supercharged car then a turboed car.take care.

 

Here is a link to the instructions for hooking up a dual port wastegate and the options for hooking it up.

http://www.turbosmart.com.au/index.p...download&id=28

JET

 

thanks tim and jet, there are a few things im gonna try before slapping the external wastegate on the car.

 

so ive found absolutely squat about this on the net. but i have a good idea.

i know the second port needs to see boost and not vacuum, so that means i can probably just T if off the line going to the ebc right?

im still confused tho, if both sides of the diaphragm are seeing equal boost, wont they cancel each other out and the wg stay shut?

 

I just hooked up my WG's last night on my Greddy TT. I'm looking for info on where and how to source vacuum, but that link up top isn't working for me. No pictures. I want to run off WG preasure alone for a bit before i turn up the boost. Any ideas?

Nevermind, i found my answer. Side port to vacuum, top left open unless running boost controller. Exactly how i set it up last night.

 

Tig you are close. The lower port sees boost and is only used to open the wastegate when the preset boost pressue is reached. The upper port is for the boost controller. The output from your boost control solenoid goes to the upper port wish puts pressure on the diaphram so the lower port can't open it. When the boost controller sees that the set pressure is reached it closes the signal to the upper port so it instantly sees nothing and the lower port forces open the wastegate last second. This is why EBCs make turbos so much more responsive. On a typical setup the wastgate will actually crack open a little just before it gets to boost target which will technically slow down the full turbo spooling before it should. Hope that helps.

 

rob, youre talking about externals right, its opposite for internals.

BUT...when hooking up the 2nd port to a pressure signal, doesnt that just make the spring rate go up, say if you have a 10psi spring, and you run the ebc to the other port, doesnt that in essence make the spring psi higher because you are putting more resistance to the spring making it harder to open?

what i want to do, is add only about 4-5psi to the 2nd port, which will cause the wg to shut faster and more reliably. i believe thats the problem with the aps single boost drop, once the puck opens the turbulent flow causes it to have a hard time shutting. i want a little extra force there to help it shut.

did you see where i got it hooked up dual port, and it holds boost 100%, but it spikes real bad.

 

Yes I was referring to external gates. Sorry I've never used an internal wastegate on any of my cars.