1g BOV question

[RipperXX]

Well I am thinking there is something wrong with either the valve, or the way I mounted the valve, the car is a 90 TSi. My mods are listed, and after I did the UICP & MAFT install I had to remount the BOV, so I bolted it up with the vent faceing the firewall, (the flange is on the bottom of the pipe).

Now before I did the upgreads, once in a blue moon I vented the BOV knowing it's not a good thing just for the hell of it. At that time it vented very quickly and well sharp I guess would be a good way to explaine it.

Now it is a long drawn out vent compaired to before thats not quite as loud. I am thinking its either alot more air to vent than before due to the larger UICP, or that it has to do with the way it is mounted.

Im not exactly close to my car right now (Iraq) and was just curiouse as my old man could try fliping it around so that the vent faced the front of the car if it was incorrect.

 

[DSM90AWD]

Now it is a long drawn out vent compaired to before thats not quite as loud. I am thinking its either alot more air to vent than before due to the larger UICP, or that it has to do with the way it is mounted

Have you pressure tested your Intake/UIP? Did you replace the BOV gasket? Is the BOV "crushed" or otherwise modded?

The factory BOV has a small orifice on the underside of the body to draw in (+) pressure from the UIP for the "quick release" feature. If you are leaking boost at the BOV flange you may not get as much assist , hence the slower opening.

Also if the BOV vacume line is pinched or leaking, the "vacume assist" from the top of the valve may be as effective.

In either case it doesn't matter which way the BOV is facing

 

[Defiant]

^ ^ ^ Right. Orientation won't matter. I've never had a BOV sound the same after being removed and replaced. Do it again, and the sound will change again.
Do not vent.

 

[RipperXX]

Thanks, i'll have to pressure test it when I get back to the states and make sure it's got a good seal and that hole you mentioned is not blocked.


BTW, the intake is setup in a MAFT blow though style, venting doesn't hurt it in this case... proably doesn't help it either though, but what can I say I like the sound