Boost problems

[Claus Vegener]

A torn diaphram?
Would give max boost preventing opening at all
because the MF pressure don't lift the WGpiston.
Claus
----- Original Message -----
From: "Mike Miller" <mikemilr at blackfoot.net>
To: "Eyvind Spangen" <eyvind.spangen at c2i.net>; <200q20v at audifans.com>
Sent: Saturday, October 05, 2002 4:54 PM
Subject: Re: Boost problems


>
> ----- Original Message -----
> From: "Eyvind Spangen" <eyvind.spangen at c2i.net>
> To: <200q20v at audifans.com>
> Sent: Saturday, October 05, 2002 6:03 AM
> Subject: Boost problems
>
>
> > I'm only getting 1.7 bar indicated on the dash gauge. I have checked
> > for leaks, replaced bypass valve and WGFV, I even tried blocking the
> > hose to the wastegate, but then I only got 1.6.. I tried using
> > regulated, pressurized air on the small line to the ECU, I adjusted it
> > to about 2 bar absolute pressure, the dash gauge shows 1.9 max. With
> > the standard pressure transducer should this be correct, right?
> >
> > But I still wonder why it doesn't give full boost, even with the lower
> > wastegate hose blocked off.. When I did this on my old 200q10v, it hit
> > the overboost cutoff very quick..
> >
> > I removed the top cap on the wastegate, everything looked normal in
> > there..
> >
> > I tried pulling codes, nothing.. (4444)
> >
> > Any good tips? I'm really puzzled..
> >
> >
> > --
> > E. Spangen
> > '90 Audi 200TQ20v
>
> My understanding is that when that wastegate hose is clamped off, the only
> thing holding the WG closed is the spring pressure. You should hit overboost
> very fast as you say you did in the 10v. I can think of only two
> possibilites - a torn diaphram or the WG valve not fully closing/seating.The
> WG is pretty easy to remove and disassemble.
>
> mike miller
> helmville mt
>
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