re- boost controller options- autoworlds article

[james accordino]

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:
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> 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!!!!!!


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