[Supras] blowoff valve recommendation

[Steve Michael]

Bernie,

I've been watching the post for awhile, and I've come to this conclusion:

Swap your 5spd for a built Auto tranny.  
No more throttle slam when your foot never lets off the gas!

FWIW, I've been running both the Saab & the Porsche valve for years now, and I've only had to deal with Zaron making Hooting sounds to mock my car during our drive to Vegas back in '98 or '99. The Porsche replacement doesn't hoot nearly as much, and it's been absolutely adequate for all my mods up to now (Stock trim CT, 305 RWHP & 350 RWTQ @ SILV '07).  But my '90 is an Auto (and always WILL be, dammit Koos!).

...but that's before I implant the 60-trim sometime over the holidays.

consider...Option #3: Heavy-duty Billet version of the Bosch design for ~$125. All Aluminum-construction, Interchangeable springs for custom release rates, larger inner diameters, vents back into the intake AND they look very nice.  

The last I saw one was in the showcase over at DynoComp here in Scottsdale. The way it's looking, I'll be springin' for one when I go in to fine-tune the new set-up.

Steve in N.Scottsdale...90T for Me!


Subject: Re: [Supras] blowoff valve recommendation
To: Jordan Weaver <jordanweaver at gmail.com>
Cc: Supras at supras.com
Message-ID: <473A81E3.2070609 at technicaldevelop.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

Jordan:

    I have only one piece of blue silicone line and that is between the 
FPR and the VSV which controls it for hot starts.  It seems rigid at 
temperature and is there only because it was handy and was the right 
length.  All of the other hose is black rubber.


    Vacuum plumbing to the Bosch blowoff valve is stock, meaning that it 
goes through the small bore tube next to the 3000 pipe.  Since there is 
more volume to be exhausted in the Bosch diaphragm chamber than in the 
stock valve, I could understand the surging to continue for a fraction 
of a second.  But it lasts almost a second if I suddenly close the 
throttle and disengage the clutch at the top end of any gear and let the 
engine come to idle.  It is possible but doubtful that the Bosch valve 
is not getting any vacuum since everything is plumbed like stock.   Yet, 
it is one thing to check.  One  other thing I'm thinking about doing is 
putting a tee in the vacuum line at the front of the intake plenum and 
running 1/4" fuel hose right to the BOV diaphragm.  Since the fitting is 
large, I can alternatively remove it, drill and tap it for either a hose 
barb or for a 1/4" flare fitting, and run 1/4" aluminum tubing to the 
BOV.  The aluminum could be tucked out of sight and tie wrapped to the 
frontmost tubing bundle (in front of the 3000 pipe). 


Bernie (now looking for more power, dammit).