[s-cars] BPV follow-up

[Joel Rector]

Are you referring to the 710s or the 110 "sport valve" (which are supposedly
good in 500 hp cars)?

Thanks,

Joel Rector

----- Original Message -----
From: <Djdawson2 at aol.com>
To: <s-car-list at audifans.com>
Sent: Monday, June 23, 2003 9:22 PM
Subject: [s-cars] BPV follow-up


> --
> [ Picked text/plain from multipart/alternative ]
> Well, just thought I'd provide a summation of my Bosch BPV experiences
over
> the past week.
>
> Between a friend and I we have 5 Bosch BPVs.  All tested good prior to ECU
> upgrades that allow boost levels of over 20psi.  A very short time later,
all
> five are shot due to blown diaphragms.  They all blew right at the low
pressure
> port... the only place the diaphragm isn't supported by the plastic
housing.
> Performance loss as a result is certainly measurable, but not what I'd
call
> extremely noticeable.
>
> Now, I know there's been a lot of debate about the Bosch valves being good
> and effective, but if you've got a car running 20+ psi, I would highly
recommend
> checking your valve to make sure.  It takes about 2 minutes if you have a
> spare BPV, and only a screwdriver.
>
> Try this:
> Unhook your small manifold line from the BPV installed in your car.  Hook
> that line up to your spare BPV, not installed in your car.  Start the car
and let
> it idle.  Put your ear to the low pressure side of the BPV and take a
listen.
>  Hear any hissing?  If so, the diaphragm is shot and leaking.
>
> I'm pretty convinced, after going through 5 BPVs in a week, that these
> diaphragms are not capable of dealing with "chipped" boost levels.  I
don't think my
> experience can be coincidental.
> Anyway... hope these findings help someone.
> Dave in CO
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