1.4 bar low boost and recent owner impressions

Phil Rose pjrose at frontiernet.net
Wed Jan 28 15:24:51 EST 2004

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 
>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 Rose
Rochester, NY
mailto:pjrose at frontiernet.net

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