Mad Cow

Problem:
I have issues in first gear with traction at 7psi, and I want to run more.

Answer:
Make a dual-stage boost controller system that will run 7psi (wastegate spring) in 1st, and 10/12/14/whatever psi in every other gear (ie once I pass 35mph).

I have everything figured out except for the solenoid. I need a solenoid that will either:
A) Switch from one vacuum source to another, in the form of a Y or a "tee".
B) Open or close when it's supplied with power.

Now, there are plenty of solenoids in the engine bay already, I'm wondering if there is one that will fit this purpose. Anyone know? Anyone have suggestions as to where I can find any solenoid to suit my purpose?

beepy

GM part # 1997152 is a real nice 3-port boost control solenoid that only costs $9.37.

When no power is applied to it no boost is bled off and you get wastegate setting boost.

When it gets constant 12v, it bleeds all boost signal off.

What you need to run it as a simple electronic boost controller is a device to apply 12volts at a certain duty cycle. The simplest I could think of would be this:



With such a circuit you could get from 0 to 50% duty on the solenoid, and with that you could alter your boost from 7 PSI to probably 14 or so. (The potentiometer would be one of those big audio ones, so you could change your boost with the twist of a ****)

More info: http://www.electronic-circuits...shtml

Mad Cow

While that is great in it's own right, I think I wasn't specific enough with my post. That will likely be my next project once this is done/working. Have you tried the circuit you posted? Looks like a very cool idea.

What I want/need at the moment is a simple open/close valve so that I can switch between a manual boost controller and wastegate pressure.

AspectIndustries

FOr a noobie like me, someone should make this with instructions. Since I have no clue what the above means.. -=P Wells, could be Im just lazy to find out and actually put some thought into it.

Useful stuff though.

Syner-G-Racing LLC

the gm controller above will work...what your wanting to do will exclude the circuit he posted though. wire a SPST switch to the boost solenoid and a 12v source.
run the manual boost controller inline with the gm solenoid and with no voltage present you will run off the manual boost controller, with 12volts applied via the switch you will run off of the waste gate spring bypassing the manul boost contoller. if you want to get high speed you can get a programable time delay relay (complete ready to use circuit with resistor blocks for adjustable time) to switch the 12volts automaticaly at a given time say 2.5 secs, that should be enough time to get out of firts gear! good luck

Mad Cow

Awesome, thanks for the info. I'm actually just going to write an uberdata script to control the solenoid (or possibly use the nitrous script that's being developed). Thanks for all the great info, I'll have to bookmark this thread.

Mad Cow

Also, what kind of connector do I need for the solenoid? Is it standard?

Zakar

i always feel like MacGyver after making stuff like this..

Mad Cow

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Zakar &raquo;</TD></TR><TR><TD CLASS="quote">i always feel like MacGyver after making stuff like this.. </TD></TR></TABLE>

Absolutely. It's fun to have high dollar functionality for low dollar price tags.