What are my available vacuum sources? (BOV related) - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

AdamP · 03-09-2007, 03:43 AM

I has a '91 Sil80 running stock 7psi of boost (SR20DET).

I'm thinking I have a weak vacuum. I'm looking at the BOV and even when it's making some lower boost (2-3psi not fully spooled) the blow of valve is not opening at all remotely. I only seems to open up at medium boosts (where is kind of bounces around) and at high (it opens up cleanly).

The BOV is an Blitz SS (but I had an ARC that behaved the same way) so I'm confident it's the line itself. The BOV is spotless and it is lubricated well. I donesn't even matter even if I pull the screw out and loosen it fully. It will not even budge at minor boost. The ARC had a softer spring and it didn't either.

Which lines can I use? Which ones are redundant. Right now I am running am running the FPR and the BOV off the same line with a t-connector. Also, what size should I get for the hoses? The Blitz itself has a larger vaccuum nipple than the ARC.

03-09-2007, 03:43 AM	#1
AdamP Leaky Injector Join Date: Jan 2007 Location: Edmonton, AB Age: 39 Posts: 50 Trader Rating: (0) Feedback Score: 0 reviews	What are my available vacuum sources? (BOV related... only opening mid/high boost) I has a '91 Sil80 running stock 7psi of boost (SR20DET). I'm thinking I have a weak vacuum. I'm looking at the BOV and even when it's making some lower boost (2-3psi not fully spooled) the blow of valve is not opening at all remotely. I only seems to open up at medium boosts (where is kind of bounces around) and at high (it opens up cleanly). The BOV is an Blitz SS (but I had an ARC that behaved the same way) so I'm confident it's the line itself. The BOV is spotless and it is lubricated well. I donesn't even matter even if I pull the screw out and loosen it fully. It will not even budge at minor boost. The ARC had a softer spring and it didn't either. Which lines can I use? Which ones are redundant. Right now I am running am running the FPR and the BOV off the same line with a t-connector. Also, what size should I get for the hoses? The Blitz itself has a larger vaccuum nipple than the ARC.