By-pass valve

[edkellock at juno.com]

I have an '89 MC2 with SJM 1.8 which creates a bypass valve-like noise
when I left of the gas, fairly gently sometimes, even in gear.  A friend
suggested it might be the rear main seal.  Something is fluffing or
fluttering off the excess boost pressure, but it's not a bypass valve...
not yet.  I do have an intercooler with the fitting for a BPV waiting for
install.  I don't seem to have any other boost-related issues though so I
don't worry about the sound much.  It still goes like stink.  Am I living
in blissful ingnorance?

Ed
Colorado Springs

On Sun, 24 Nov 2002 07:22:30 -0600 "Chander Balakrishnan"
<balakrishnan3 at attbi.com> writes:
> This is a multi-part message in MIME format.
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>
> I have had a SJM 1.8 modification and a k24 turbo installed in my
> 1987
> 5kcsq.  The car drives great.  Every time I let off on the gas pedal
> after
> accelerating to shift gears, I hear a loud shuddering sound from
> under the
> hood.  I take it that this is due to the absence of a by-pass valve.
>  Some
> questions:
> 1.  Why didn't I hear this before the SJM mod, or do not hear it in
> my 1990
> 200 quattro wagon ?  IS it due to the higher boost pressure with the
> SJM mod
> in my 87 car ?
> 2.  Can I cause damage to the car by not having a by-pass valve ?
> 3.  Will a by-pass valve also improve performance ?  I recall
> reading a note
> by a lister (Ben Swann ?) that he felt a subjective improvement in
> performance (due to the turbo staying spooled up ?)
> 4.  I am not very handy, so if I wanted a bypass valve set up
> installed,
> would buying a 1991 200 20v intercooler/by-pass valve set up be the
> way to
> do this ?
>
> Thanks.
>
> Chander
>
>
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>

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