[s-cars] Too much boost

[Tom Mullane]

My plan is to get the manual controller working solo.  Once that is
working well, I'll add the WGFV back into the mix.

I will report my struggles/findings.

Tom

On 8/15/05, Joe Pizzimenti <joe.pizzimenti at gmail.com> wrote:
> Hey, try it before you doubt its operation.
> 
> Granted, that diagram is for an internal wastegate, not an external,
> so you may have to play around.
> 
> Try it, report back, lather, rinse, repeat.
> 
> Joe
> 
> On 8/14/05, Tom Mullane <tmullane at gmail.com> wrote:
> > Joe,
> >
> > I took a good look at this diagram you sent, and I have some questions:
> >
> > http://pictureposter.audiworld.com/47312/manualboostctrl.jpg
> >
> > Is this based on theory or actual practice?  I ask because I'm not
> > sure it will work.
> > I do understand the theory behind it; either the manual controller or
> > the WGFV can limit boost.  In other words boost will be no higher that
> > the lower setting of the two controls, ECU via WGFV or manual
> > controller.
> >
> > It looks great on paper, but here's the problem:
> > The WGFV takes boost from the turbo and either routes it the WG to
> > force the WG open and limit boost, or it just dumps the boost back
> > into the intake track just before the turbo, allowing boost to build,
> > right?  Wrong...sort of.
> >
> > When the WGFV is closed (default, unplugged, failsafe, yada, yada) it
> > routes all boost to the WG to open it.  But when power is applied the
> > WGFV, opening it, it allows boost into *both* passages of the "T".
> > Boost bleeds off into the intake boot and cannot reach the WG with
> > enough pressure to force it open.
> >
> > My concern is thus:
> > Let's say I install a manual controller and set it to 20 psi.  The ECU
> > is calling for 30 psi max.  At anything less than 30 psi, the WGFV
> > will be bleeding off boost in the control circuit into the intake
> > boot.  There will not be enough pressure in the circuit to reach the
> > manual controller.  Even if pressure reaches and passes the manual
> > controller, won't it just be bled off through the WGFV before it can
> > impact the WG?
> >
> > Does this make any sense to anyone?
> > Has anyone BTDT?
> > Pressure may not bleed off fast enough to create a problem, but I have
> > my doubts.
> >
> > Tom
> >
> > On 8/10/05, Joe Pizzimenti <joe.pizzimenti at gmail.com> wrote:
> > > Tom,
> > > Did you try turning it down via a manual boost controller plumbed
> > > inline with the WGFV?
> > >
> > > http://pictureposter.audiworld.com/47312/manualboostctrl.jpg
> > >
> > > Joe
> > >
> >
>