[Supras] blowoff valve recommendation

[Jeff Mohler]

Well..good luck with that.

On Nov 13, 2007 6:59 PM, berniek at technicaldevelop.com <
berniek at technicaldevelop.com> wrote:

> Jeff:
>
>    Huh???
>
>
>    From all I could gather, the stock blowoff valve was said to be WAY
> to small for a 57 trim turbo.  The Bosch unit is much larger
> internally.  Right now I have a spare piece of head to crankcase vent
> hose (same as the hose behind the alternator) connected from the 3000
> pipe to the inlet of the Bosch valve, maybe 6" long.  The Bosch valve
> outlet is connected to the accordion hose in the stock location with
> almost a zero length piece of thin wall copper tubing, a tight fit in
> the Bosch outlet, held with high temperature epoxy.  The other end of
> the tubing is forced into the rubber bung on the accordion hose, secured
> with a hose clamp.  Of course the vacuum diaphragm hose is hooked up
> too.  It should be very free flowing.
>
>
>    Bernie
>
>
>
> Jeff Mohler wrote:
> > OEM works.
> >
> > I hear it bolts right up.
> >
> > On Nov 13, 2007 5:43 PM, berniek at technicaldevelop.com
> > <mailto:berniek at technicaldevelop.com> < berniek at technicaldevelop.com
> > <mailto:berniek at technicaldevelop.com>> wrote:
> >
> >     For the last two weeks I've been getting my jollies by driving my
> '91
> >     with 550cc injectors, 57 trim turbo, Walbro, Lexus, 3" exhaust from
> >     turbo back, etc.  However, a disturbing boing-oing-oing sound has
> >     persisted from the air intake when closing the throttle under 15 PSI
> >     boost.  Spoke to James at Performance Techniques about this, and
> >     he says
> >     it is compressor surge, which I suspected.  From all I have read,
> >     using
> >     the Bosch Porsche right angle blowoff valve should have been
> >     sufficient,
> >     but it is not.  I get the sound even at low boost.
> >
> >
> >     So I'm looking for recommendations as to which BOV to use.  I
> >     would like
> >     to recirculate to the accordion hose, even if I need to cut a hole
> >     in it
> >     and use curved, clamped large washer-like pieces on the inside and
> >     outside to provide a large bung for the BOV discharge.
> >
> >
> >     Any and all suggestions would be appreciated.  Thanks.
> >
> >
> >     BernieK.  PS:  Arlene and others were right.  There is never enough
> >     power even if you can "walk" the tires in second gear.  Starting to
> >     wonder what to do next for more HP.
> >
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> >
> >
>