re- boost controller options- autoworlds article

[auditude at cox.net]

Hi folks,

Ya know, there are some posts about this setup in our own archives:

http://www.audifans.com/pipermail/quattro/20010129/015754.html
http://www.audifans.com/pipermail/quattro/20010202/016266.html
http://www.audifans.com/pipermail/quattro/20020528/055055.html
http://www.audifans.com/pipermail/quattro/20020529/055071.html
http://www.audifans.com/pipermail/quattro/20020530/055154.html

I'm sure there are others.  You can follow the threads in the archives, or search for similar terms.

I have a Home Depot pressure regulator acting on the upper chamber of my '88 5kcstq.  I back it down to
maybe nothing when the weather was way hot, because I thought I was getting some knock.

I would like to hook into the MAC's knock circuit to get an idiot light function.

Also, I pulled an APC setup less the computer from a 'yard.  The computer was already gone, but I figured
I'd take the opportunity to get as much as I could.  Later when I find a computer, I can pull it and finish the
setup.  This should be able to help put some safeguards back into the manual boost controller system.

Later,

Ken

james accordino ssgacc at yahoo.com wrote:
>
> Yeah, agreed.  The wastegate opening can't bleed off
> boost faster than in is being produced so the pressure
> rises above the set "limit".  That's why the guy
> BigMouse on Audiworld was seeing 20 psi shortly in low
> gear while it was "set" at 14 psi.  I think this
> should be O.K. as long as it's brief and in lower
> gear.  Extended overboost in high gear/high load
> situations on the other hand....
>
> Jim Accordino
>
> --- Alan Pritchard <apritchard at seaeye.com> wrote:
> > This message is in MIME format. Since your mail
> > reader does not understand
> > this format, some or all of this message may not be
> > legible.
> > --
> > [ Picked text/plain from multipart/alternative ]
> > Hmm autoworlds article seemed very good, until i
> > thought about it....
> > For those who havent read it the author installed a
> > "pop off valve" in his
> > actuator line, the idea being that until x psi is
> > reached the wastegate does
> > not open, thats fine, but then he needed a way of
> > setting the maximum boost
> > level.  So he installed after the pop off valve a
> > pressure regulator and set
> > it 1 psi above that of the first valve.  The idea of
> > the regulator is that
> > when it reaches its set psi it will not allow any
> > additional pressure
> > through, thats sounds ok you all say, BUT this isn't
> > regulating inlet
> > pressure, this is regulating wastegate actuator
> > pressure therefore the
> > wastegate actuator can not recieve any additional
> > pressure than that is set.
> > So he was wondering why sometimes he was gettin 12.5
> > psi, rather than the
> > set 11 psi. So here goes....
> > Boost is rising but the wastegate is not opening,
> > when 10 psi is set in the
> > wastegate line the pop off valve opens and allows
> > the wastegate to start
> > opening but the wastegate can not open as fast as
> > possible because of the
> > pressure regulator set at 11 psi, therefore while
> > the wastegate is still
> > opening to its full amount the turbo is still
> spooling!!!!!!