1.4 bar low boost and recent owner impressions

auditude at cox.net auditude at cox.net
Wed Jan 28 15:58:57 EST 2004

Phil Rose <pjrose at frontiernet.net> wrote:
> At 9:51 AM -0500 1/28/04, <auditude at cox.net> wrote:
> >Hi Phil,
> >
> >The bypass valve I put in was a new unused OEM Bosch one.  These 
> >don't make any noise?  It's not super-loud, but I can tell it's 
> >there.
> >
> >Is this the consensus of the rest of the list?  Stock Bosch BPV's 
> >don't make a shoosh?
> >
> >Why would a tear make it louder when shifting?  I can understand 
> >maybe if it was making noise under boost but not while shifting.
> A leaking vac hose (or a tear in the BPV bellows material) acn 
> prevent the manifold vacuum from fully retracting the bellows valve 
> when you go off-throttle. If the valve is able to open only slightly 
> (rather than full open) it might cause the (bypassing) boost air to 
> make a "whoosh" sound as goes past--towards the turbo inlet. I 
> suppose that same tear in the vac hose could account for low boost.
> Phil

Phil, that makes perfect sense.  Now I wonder if the BPV that I put in is already faulty.  That would really suck (or is it blow? :-P).  I bought the BPV long ago for my 5kstq, but never got around to installing it.  So I had it "in stock" when I got th 200q20v.  If it is bad, I probably won't replace it with another Bosch, since it will have failed very quickly.

So these plastic Bosch valves are pretty silent when everything's up to par?



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