Boost gauge/controller vacuum lines

[Andrew Dahms]

I fully rebuilt my engine 1000kms ago and now im ready to start giving the engine some boost. The only problem is that my gauge isnt reading any boost (it does have power to it) and the profec b spec 2 controller does not show boost either. Can someone tell me where the lines should be hooked up?

PS- I only have one vacuum port used on the greddy type rs bov. What are they both used for.

 

[MrBoxx]

You should be taking your boost gauge signal from the line between the Fuel Pressure Solenoid and the Intake Manifold.

For the boost controller, you should have the boost pressure source as close to the compressor housing as possible, preferably a nipple on the J-pipe or compressor housing. Do not tap the BOV-IM line for a boost controller.

For the Greddy RS, use the top nipple for the actuator signal. This line should run continuously from the BOV to the Intake Manifold, no tapping for anything in between. The lower nipple is used in some applications for a "quick release" feature, however, it isn't used very often on our cars. Most people tend to leave the nipple uncapped and un-used.