[Supras] blowoff valve recommendation

[Jordan Weaver]

Bernie,
What is the condition of your vacuum lines? A year ago, I installed some
brightly colored silicon vacuum lines (bought off eBay) to go with my new
60trim CT26, and almost immediately noticed compressor surge - even at low
boost. My setup is all custom, and my BOV is more than adequate. A friend
cautioned me about using those silicon vacuum lines saying they will
collapse when hot. Switched to some generic black vacuum line bought at
Autozone and haven't had any problems since.

Jordan

-----Original Message-----
From: supras-bounces at supras.com [mailto:supras-bounces at supras.com] On Behalf
Of Jeff Mohler
Sent: Tuesday, November 13, 2007 10:09 PM
To: berniek at technicaldevelop.com
Cc: Supras at supras.com
Subject: Re: [Supras] blowoff valve recommendation

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.
> >
> >     _______________________________________________
> >     Supras mailing list
> >     Supras at supras.com <mailto:Supras at supras.com>
> >     http://supras.com/mailman/listinfo/supras_supras.com
> >
> >
>
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