[Supras] PS: "Awesome" posting about first 12 PSI boost ride

[berniek at technicaldevelop.com]

Joeff:

    Yes, as stated before I want to get rid of the HKS foam that ants 
can crawl through.  The stock paper element is a little larger in 
diameter than the HKS foam-not, but should be adaptable if the pressure 
drop will not be too great.  Please let me know what other ideas you have. 


    Just roughly modified the stock boost gauge tonight to read up to 
about 14 PSI at full scale by cutting the orange lead from the sensor, 
inserting a 1K resistor in series with the sensor and a 2.5K resistor 
from the gauge input to ground.  Seems to work OK to indicate about 13.5 
PSI boost full scale, the apparent limit with the stock boost transducer 
when operated on 5V from the stock ECU. The ECU actually biases up the 
sensor output, which is pinned at full scale if the sensor is 
disconnected.  In any event, for a rough cal, the dash sensor now reads 
full scale for about 14 PSI boost.  I'm going to get a bona fide silicon 
strain gage pressure transducer with  0-5V output covering perhaps 0-25 
PSI, or 0 to to 35 PSI absolute pressure and use it instead of the stock 
sensor.  At a future date I will recalibrate the gauge face. 


    What do you recommend for a decent air filter with enough surface 
area?  I'll cut the radiator wall to fit if it protrudes through.  One 
of my local speed shops have nice looking long conical filters with 
rubber curved flow sections to enter the AFM. 


       Bernie

Jeff Mohler wrote:
> Oh goodness.
>
> 1)  Throw away the HKS dirtflow filter, right now.  Its crap, no bones 
> about it. 
> 2)  The hoooot is the budget BOV valve, accept it or upgrade it.
> 3)  have fun.   :)
>
> On 10/31/07, *berniek at technicaldevelop.com 
> <mailto:berniek at technicaldevelop.com>* < berniek at technicaldevelop.com 
> <mailto:berniek at technicaldevelop.com>> wrote:
>
>     Hi again.  Forgot to state that the turbo is 57 trim.
>
>     However, when spooling up, I can hear a wooshing sound coming from
>     the HKS
>     air filter, almost as if the blowoff valve is opening and
>     bypassing air
>     back to the accordian hose.  Whe backing off the throttle to
>     shift, the
>     "woosh" turns to a "twang" of sorts, as if there is a organ-pipe
>     resonance
>     someplace in the intake piping, or maybe due to the delay in getting
>     vacuum to the top of the BOV diaphragm.  The BOV is a Porsche-Saab
>     Bosch
>     unit.
>
>     Thought I would hear a whine from the turbine coming from the open air
>     filter, but hear the whoosh instead under boost.  Any ideas would be
>     appreciated.
>
>          BernieK
>
>
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