Electrical Boost Solenoids
Turbo Mini Forums

I have had a quick scan on ebay for one and just found this as an example

http://cgi.ebay.com/ebaymotors/ws/eBayISAP...atchlink:top:en

i want to buy this one or similar and i want to be able to have it linked to a "boost" button in the car...

when the push button is off it will run 9psi but when i turn on/push the button in it will give me another preset boost, in the reigon of 14psi

What i would like to know is what i would likely need for this + how they actually work? is it just a solenoid that opens or shuts with 12volts of power flowing ?

i wanted to make my own circuitry for it if its simple enough, i have basic knowledge with electronics

Thank You :)

Yes, but I'm sure you could source similar here for less money.

Bound to be plenty of OE turbocharged cars here you can get second hand.

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will

Look for a standard boost solenoid off a 200sx - it was designed to limit boost in 1st and 2nd to actuator pressure, and then run a higher boost pressure in 3rd onwards.

I got one set up in my car. Mine came from a metro turbo as they have oneas standard that allows more boost at 5K revs.
A metro turbo one may be alot cheaper also.
Basically i've ran 2 vaccum hoses from the turbo snail housing, one to the actuator set a your lowest boost setting that you want (9psi) and the other to your solenoid.
The solenoid is closed when swithed off and opens to atmosphere when turned on.
You will need to add a bleed valve to the oher side of the solenoid so you can adjust the amount of boost when its swithed on.
Its very simple and means there needs to be more pressure (14psi) for the actuator to open at 9psi.
Mines runs off a 12v system with a 5amp blade fuse.

impreza have them behind the head light drivers side, starlet glanza, metro turbo had one, my mate informs me a mazda 323gtr has one aswell

as daft as it sounds i bet a bus will have loads :)

Yes i moved to the darkside

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Good man.

Flicked the switch for the first time today and ran it at 1bar. Would have shat myself if I wasn't laughing so much.
Its amazing!!

The one listed above is similar to the one that we are going to use on the Miglia and controlled by the Megasquirt.

In our case the ECU modulates it to control to a certain boost level dependant on Throttle and rpm.

You probably just need a simple on-off solenoid for your needs.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

just remembered that mine is also linked through my Jolt so when you flick the switch it will only go to full boost after 4000rpm.

Dont understand why you have a second bleed valve in the line to the actuator,as the actuator controls the boost anyway.

I would say no, well not very effectively anyway.

If you try and do it at a tee piece on the compressor outlet itself it will all depend on the size holes in the tee piece and tubing as to how effective the second (solenoid) operated bleed is - if the holes in the tee piece are large and your solenoid valve small, it may have minimal effect on the air supply to the "first" bleed valve.

If I was doing it your way I would put the tee off to the second bleed valve in the line after the first one.

The solenoid bleed valve you referenced on eBay is wrong in both examples, it needs to be just a straight solenoid valve like you have shown in your drawing, not a three way one.

However, a much better way would be to use an actuator rated at 9psi (without any bleed) and then a single solenoid controlled bleed valve to fool it to 14psi.

Schrödinger's cat - so which one am I ???

I got a solenoid from some sort of turbo volvo for £10 from a scrapper, already had this novelty bleed valve and bought some wire connectors and a box from maplins and now i have my boost controll box :) going to wire it to a switch on the dash from a spare 5amp terminal on the fuse box..

http://i185.photobucket.com/albums/x28/joh...tController.jpg