https://www.thirdgen.org/forums/grou...ntrollers.html

I'm making them for a school project. They are pretty cheap to make (compared to buying one). check out the above link for more info or for questions

 

As in a solenoid controlled to actuate a stock swing gate wastegate. Or just a vaccuum/boost regulator. If it is just a vaccuum regulator then use a Syclone or EGR solenoid ($20), a 555 timer & hand wire PCB ($20).
The solenoid boost contoller would be interesting.

 

the syclone/egr solenoid would be a good idea. The boards use an LM111 comparator, potentiometer and a relay. Also, some optional resistors and a capacitor for a low pass filter on the MAP signal. The idea was to regulate boost pressure to a factory style diaphram wastegate actuator and flapper.
The only problem I see with the egr solenoid would be the air flow rate, it might flow too little air and cause boost spikes due to delayed airflow (although I have not tested that). Another idea I havn't tested are the AIR diverter solenoids. I could also sell the unpopulated boards and parts list for cost ($8ea.). The proposed air Solenoid valve cost me $60.

edit:
I forgot to mention:
I originally wanted a solenoid linear actuator, but I couldn't find one that could take the heat (200*F was the highest I could find). However, I could develop something if the user is willing to sheild/insulate the solenoiud actuator at their own risk.

 

What would the 555 timer IC be used for in there? Why not just one of the solinoids and an adjustable hobbs switch?

 

The 555 timer could be used to pulse width modulate (PWM) the vaccuum solenoid. I am not sure how fast the vaccuum port actuator would wear out using this setup. I wanted to test one out but kind of got lost in some bin hacking and finishing up the turbo install on the truck.
I would really like to get a stepper motor setup to control the wastegates. The $58 could be changed to operate it. The $8D could do it also with some code added in.

 

The valve that I designed the circuit to use is a 4 way 2 position valve. When the valve is closed the wastegate diaphram is exhausted to the atmosphere. That exhaust port can be restricted with a flow control valve to smooth the action of the flapper valve. You get the same "partially open" valve as you would with the 555timer, but without the high frequency modulation. The modulation MIGHT be as high as 4Hz, but thats pretty low. If I recall correctly, the lifespan of the valve is 10^6 - 10^7 cycles. Thats a pretty big gap, but the valve is only in cyclic loading when under boost.