Originally posted by "mustang23"
Originally Posted by SLAAB
I want to replace the 3way solenoind boost control valve that fits 6mm ID hoses. What is available? The stock boost control valve on my 1997 Saab Turbo is a bleeder type valve. The bleeding contributes to boost lag.
I want to eliminate boost lag while maintaining ECU control. I have an aftermarket ECU that provides a high degree of integration between boost, fueling, and ignition that I want to retain so manual boost controllers and stand alone EVCs are out of the question. The bleeder valve seems to be the heart of the matter.
SLAAB's web page
You could go with a manual boost controller like a "Gillis valve"
http://www.boostvalve.com/. The maker of these is Ric Gillis and he is local (NPR). His uses a ball and spring design so the wastegate does not see any boost until your manually set level is reached. (you could just set it to the factory level if you still want computer control, or you can raise it if desired.
http://www.boostvalve.com/tech/TECII.html This is telemetry a buddy and I took on his SVO mustang showing the boost control the valve has. Notice that it stays dead even at 16psi. The slope coming into boost is actually him feathering the throttle so the car can hook (notice TPS angle and engine RPM with shift points). Ric sells a ton of these and they all work fine.
Like I said, I do not want an MBC. Temperature in Tampa varies from 30 to 110 degrees. Installed properly, you will need to adjust the MBC to compensate for temperature and elevation variation. All of them are adjusted with screws. My ECU does temperature and altitude recalibration in real time, recalculates fuel maps in real time, plus uses the electrode potential across the spark gap as an in cylinder ionization sensor .
Piggy-back EVCs (boost controllers) are also out of the question. The electronics won't be as well integrated as my ECU (already boosting 21 psi), plus I'm not about to pay hundreds of dollars for a $50 part.
Are the solenoid valves from the EVCs sold separately? All I want to change is that stupid valve they installed at the factory to a non-bleed valve.