Check valve
 

this pic is off of Turbo Project CRX DX under "charge piping"

https://www.homemadeturbo.com/turbo_...ck-valve_P.jpg

i need to make one of these check valve thing.. to stop check engine while under boost... can anyone tell me whats the basis behind it and the best way its done? i tried searching... all i get is freekin catch can diy's..

You ban buy check valves from any aquarium store

Double post

oh.. ok i get it, to not let boost creep up by the sensors, omw to get one right now.

I'm using a thing called a "krankvent" it's supposed to hold back like about 75 psi if I remember correctly, so I'm still using the pcv system off boost. They come in a couple of different sizes. It costs a little more money than an aquarium valve, but then again last time I checked my engine is worth more than an aquarium. I've got it setup right after the pcv valve in the picture. On the valve cover on the other side of the charge pipe, I'm just taking in a little atmosphere air. I don't even need a catch can and I don't blow any oil out of that tube either. Yeah, I was shocked at that one too, but that krankvent is fast and seals perfect.
http://img227.imageshack.us/img227/1...etup005.th.jpg

hmm ok here is what i know, the whole point of the check valve is to "bleed" boosted air thats creeping up my vacuum lines to the sensors.

So to hook it up i would tee off my vacuum line before my map sensor, one end would be map other would be source of vacuum and middle the check valve to vent into atmosphere to function properly?

Dude! what kinda engine/car you have? That looks freakin stock!