Half Jap Boost Junky

My wastegate wasn't opening when I had Steve here to tune my car and I think I've discovered the reason why.

As far as I can tell an external wastegate is supposed to have 2 nipples. 1 on the top and 1 on the side.

The one on the side is missing and there is a threaded hole where it used to be. I bought the wastegate used and just never noticed (duh).

My question is, is that side nipple a free flowing port or is it supposed to allow air to flow in 1 direction only? I need to know so I can find a replacement part and get my car going.

Thanks for the help.

-Kenji

funklove

Is it about TIAL?
U can use only one nipple on it. Read manual.
On our central-motor turbo Honda CRX we use tial 38mm in this way.

setzep

side is the one you want to hook up to, vent the top.

Half Jap Boost Junky

The wastegate I'm using is a Greddy Type - R 47mm external wastegate if that helps.

-Kenji

RXciting

That threaded hole is probably where a banjo bolt fit in to. Which would be your source for boost to the WG. The top nipple is where you would plug in a line coming from a electronic boost controller.

It's pretty simple once you figure it out, but i really only found out the use for the top nipple very recently from a fellow local forum member!

GUITARJUNKIE28

side opens the gate, top closes it (for boost control).

Half Jap Boost Junky

So is the side port a 1 way valve or can I just use a fitting with a barb on 1 end and the proper thread pitch on the other?

-Kenji

GUITARJUNKIE28

yea. vacuum line from there to the compressor housing and you're good to go.