[s-cars] occaisional slight over-overboost?

[Daniel Koropchak]

Had a similar issue. Recently found blown-out rubber T under the throttle body. 


--- On Sun, 3/29/09, JC <jc at j2c3.com> wrote:

> From: JC <jc at j2c3.com>
> Subject: Re: [s-cars] occaisional slight over-overboost?
> To: fastscirocco_2000 at yahoo.com, "'Audi S Car List'" <s-car-list at audifans.com>
> Date: Sunday, March 29, 2009, 10:57 AM
> Chris -
> 
> Thanks - I actually tossed a brandy new N75 in late last
> year and I'm pretty
> sure it's good.
> 
> For a minute I wondered if the BPV was actually sticky and
> that was causing
> a boost spike but the peak hits before I lift throttle, not
> after so that's
> out.
> 
> I will do the pressure test, I've got most of the parts
> to make a pressure
> testing rig although have hit a few snags in getting the
> right size cap
> itself. Visual inspection certainly hasn't been able to
> find anything.
> 
> I was thinking about doing the old unlit-propane torch
> trick too to see if I
> find a leak that way, but there's the issue with
> no-leak-under-light-vacuum-but-leaks-under-heavy-boost so
> it's not a great
> technique for forced induction problems...
> 
> BTW, the sender for my gauge is located in-cabin on a T at
> the ECU so it
> should be reading exactly what the ECU sees.
> 
> >
> > 2. If there isn't any boost leak then I'd
> start looking at
> > the WGFV aka waste gate frequency valve. It's the
> valve that
> > converts the electronic signal from the ECU and
> controlls the
> > waste gate which cuts out boost. You can read about it
> here:
> > http://forums.audiworld.com/showthread.php?p=18873174
> >
> 
> 
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