Leaky BOV or Not. . .

[91DSX]

My car has a TurboXS Type H BOV mounted on a custom made IC pipe. The vacuum line going into it was teed from a generic spot on the manifold. Anyway my car would only make 5-6psi in any gear and the BOV was definetely leaking, very audible. Simply diconnected vacuum line on the BOV to further see if BOV was actually leaking and car ran 11psi consistently and constantly. Whats going on here? I've checked EVERYTHING over and over again but can't seem to find a solution? Can this particular line be sending both a vacuum signal and a boost signal at the same time, I've always thought our MAP sensor cars either see boost or vacuum not both? Thanks for any direction you can give me!

[red88shelby-z]

make sure you have a good vacuum source to your blowoff valve. i have a type-H RFL, almost the same exact thing as yours and i had a problem like that when i first got it on. i had a line going into it T'd off of this line which was T'd off of that line and so on. it would barely open up when the butterfly closed. then i got a good solid line going to it almost directly from the manifold presssure source. instanly it sounded better and responded even at low boost levels. even at like 2psi it goes off. also, check the welds on your IC pipe where the little tube that you plug the blowoff valve onto goes. my friend did a shtty job on mine, and he just covered it up with more welding. it looks like a mound of dirt coming off the upper IC pipe with a RFL coming out of it . and lastly, make sure you have the blowoff valve pushed all the way down on the little pipe, and screwed in tightly with the allen wrench it came with. and make sure the top part is screwed on all the way, too.

hope that helps

[91DSX]

I have the line teed from a stock line only once. . .The pipe was made buy a "serious" (J & R Turbo) shop who has done this for tons of cars so the welding is perfect and the BOV it securely on there in fact they're gonna mock up my intercooler and hard IC pipes. I hope I can still figure out why its leaking under boost but it is still sounding like its venting under neutral revving and mostly when quick stabs are taken at the throttle. Still stumped. . .good to hear you sorted it out, it gives me hope

[red88shelby-z]

well ****, i dunno what to tell ya. maybe you got a bum blowoff valve?

[justafor]

The bov should have come with some washers to adjust it. Unscrew the top portion of the bov and add a washer at a time until it holds the proper boost.

[red88shelby-z]

oh yeah, the washers. i didn't bother to mention because the type-h blowoff valves are good for 25psi right out of the box. i didn't have to adjust mine or anything.

[shelbyglhs222]

Mine is teed in and goes off at 0-1 psi....i dont know if its just my turbo or whatever but its a VERY loud bov..it just a stock talon but it was louder than my friends who had a 94 tt supra with one of those 300 dollar bovs.

[91DSX]

Thanks everyone for the replys, I used it when looking at the vacuum lines! Anyway it was connected via a tee to a line going towards the charcoal canister so I don't know if that means anything but I realized it was being teed at least twice. I teed it into the map sensor line. . .Well she's running very hard now and venting beautifully but I still gotta avoid boost spike which of course turns into overboost fuel cut, though I've got a TurboSmart GBC boost controller(got it real cheap. Raced my buddies VR6 tonite at three overboost cutouts and won by half a car, hes running 15.1 so I'm sure I'm at least in the 14's, . The guys I hang around with had never seen my car go so they were mighty impressed even with the overboost shutdown