Luke G.

Can i use the top banjo bolt on my wastegate as the vacuum source? My side one is to close to the manifold and wont fit. And when installing the manual boost controller should i just T into that one line going to the wastegate?

Redline130

You need to use the side port of the wastegate, assuming you are using a single stage boost controller.

Yes, you tee it into the vacuum line between the wastegate and boost reference source.

Luke G.

ok, so i T into the line that goes from my vacuum manifold to my wastegate right?

welfarepc

waste gates dont use a vacuum source they use a positive pressure source.

tap your compressor housing and use that to provide pressure to the waste gate.

PaddingtonBear

The vacuum manifold you have is probably tee'd off your brake booster line, which IS a vacuum source at idle, but when boost pressure builds in the intake manifold and becomes a positive pressure source, the wastegate works like its supposed to. Compressor housing or IM, doesn't really matter.

dpetro1

technically the wg should work either way but the manufactuerer suggest not applying vacuum to the wastegate diaphragm because it could possibly be damaged.

OP, when using an mbc you only use the side port of the wastegate. the top port can be left open.

side port of wastegate to bottom of mbc
side port of mbc to boost source. (vac mani will suffice, just not the "correct" way)

Silva Bullit DC4

This is gonna depend on the brand of MBC he's using, as some brands have the inlet fitting on the bottom of the controller, and the outlet fitting on the side.

dpetro1

oh, good call. i see hallman is set-up that way

Silva Bullit DC4

Yup, Hallman & Blox.

I ran the Blox Pro for 2 years, and I was surprised at how solid it holds boost.