Who here is running a gm 3 port bcs with an external wastegate? If so how did you route your vacuum lines? I have found this so far but Tial suggests I connect port B to the side port of the wastegate and vent the rest.

 

Nobody is running this?

 

Anyone?

 

ttt

 

damn your not getting any hits on this one! that sucks... well ll send it to the top again

 

gm 3 port is amazing. you could get rid of the taper on stock turbos(depends on the boost). you could also shape your boost curve the way you want it. im not sure with your setup on how to connect an external wastegate you could try hitting razorlab a pm since he probably knows.

 

the metal port goes to your boost source, i use a nipple on the LICP

port A goes to the side of the tial wastegate

port B (port with the filter on it) is left VTA or routed into the intake

 

Is this what you are running or assuming? I already ran it like this with not so good results. That is now the third different way somebody has told me. I am just going to fallow the diagram and see how that goes.

 

This is a MAC valve installed on STOCK WG,can this help to compare the routing?

 

thats how i run it

 

That's how I had it at first and boost seemed to come on a little slow. I just connected everything as in the first pic and it failed to open the wastegate the same as port A to top port. So the way Tial recommended and that pic are incorrect. I am going to try port B to the top port and port A to the side and see how that reacts.

 

please post up your results

 

So I ended up with port A to the side port and port B to the top port and it spools much quicker and holds boost perfect. I held 26 psi till redline.