[Supras] blowoff valve recommendation

[berniek at technicaldevelop.com]

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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