car: B18A 89 Civic 4dr.
setup: t3/t4 turbo, custom piping, dsm 450cc, smc+.
problem: BOV will not work.
Ive tried two BOV's neither of them work. I T'd into several different vaccum locations with both BOVs, nothing works. I even tried a factory Saab(bosch) BOV, and that wont work. What gives? I noticed Im only getting -10 on the vaccum side of the boost guage. Think the motor is shot? Runs great, pulls even greater...

 

maybe a leak somewhere in your piping?

 

how would this prevent the BOV from opening? Im no criticizing, just trying to figure this out. Im serisouly scratching my head here...
the BOVs are smooth too, not sticky or anything...

 

well maybe you have anough pressure in the pipes to keep you in boost but as soon as you let off the throttle the pressure escapes thru the leak and not thru the bov. I mean I'm not saying thats the problem, I'm just saying its something to look for.

 

well...maybe. its a .45 bar spring, and we are seeing 4-5 psi. the IC is HUGE though, so I figured it was just pressure drop. I checked for leaks too, all tight.

 

You have a vacuum leak. That is preventing the BOV from working. Fix the leak and the BOV will work.

Randy

 

ummm thats weird then. I was having that problem once but it was my vacuum and now its all good

 

Hmm...I will check everything out AGAIN. im positive there are no leaks. New lines all around...
i dont know what else it could be besides vaccum though...anybody else experience this???

 

what positions id you try for the vacuum?

 

I tried all of the ports on the back of the I.M. I tried one of the 3/8 lines on top of the mani...ount know anymore.
Its got to be vaccum related, because Im only getting -10 on the boost guage. you want around -22...

 

umm I have mine on my fuel pressure. Try there and use it for only the bov and fuel and see what happens

 

I will do this...thanx guys...