Quote:
|
Originally Posted by doctorstupid
I know that TEC has dual port wastegate actuators. one nipple is used to hold it shut with boost before desired boost is reached, then the boost controller flips the ports so that port is no longer pressurized and pressurizes the other port which pushes the valve open. I do not know who makes them, and I've only had the pleasure of seeing them once, on a local 15G car.
|
Dual port wastegate actuators would be a HUGE help in overcoming the exhaust pressure exerted on the flappers. As boost ramps up, there would be more boost pressure available to help the actuator stay in the closed position, helping to overcome the rising pre-turbine pressure. Boost should be (kind of) proportional to the pre-turbine pressure so the two forces would negate each other to an extent.
I was thinking about cutting open a stock TD05 actuator to see if I could figure out a way to make it dual port, but I don't know if there's any way I could seal up the arm while still allowing it to move.
If we could figure out dual-port actuators, we woudn't even need to run super-strong springs to keep them shut. I really think it's the ideal solution...