electronic wastegate

[C. Ludwig]

Also, FWIW, what the OP is talking about does exist.

http://2009.tokyo-motorshow.com/en/g...rts-W/051.html

[RETed]

Is just the bottom one connect to the turbine side?
The top solenoid looks like it's connected to the compressor side, so that's more like an electronically controlled compressor bypass valve.

I've seen wastegates used on the compressor side, but this can induce huge amounts of compressor surge upon opening.


-Ted

[C. Ludwig]

Originally Posted by RETed

Is just the bottom one connect to the turbine side?
The top solenoid looks like it's connected to the compressor side, so that's more like an electronically controlled compressor bypass valve.

I've seen wastegates used on the compressor side, but this can induce huge amounts of compressor surge upon opening.


-Ted

Good question. Looks like you may be right. Looking at the pic, from the description that was given to me, I was thinking the valves were on the exhaust side. But they don't appear to be, now that you mention it. Their literature mentions lowered exhaust pressure, so one would assume their has to be some sort of exhaust bypass. Don't see it though.

From Mahle's site:
"MAHLE GmbHElectrical waste gate actuator

Electrical waste gate actuator
The electrical wastegate actuator improves engagement by avoiding the so-called turbo lag. In addition the fuel consumption is reduced because the exhaust gas counter pressure is kept as low as possible.　Advantages include:
Up to 4% lower fuel consumption. Lower CO2 emission. High closing forces, High regulation quality. High position and repeat accuracy. Compact and robust design. Can be diagnosed."