[s-cars] Wastegate Musings

[steve powers]

There have now been several of us out here in Seattle who have had to go to 
stiffer springs.

In my case, my car had been chipped from nearly day one. It's certainly 
possible that
the spring went south. A similar car did not need a new spring. It had never 
been modified.

To answer your question: yes, the boost gets dumped. I'm running 26 psi. It 
runs a great
deal more if you don't dump it.

Steve


----- Original Message ----- 
From: "Mark Strangways" <Strangconst at rogers.com>
To: "Scott Munger" <scottmunger at cox.net>; "'s-car-list'" 
<s-car-list at audifans.com>
Sent: Monday, May 31, 2004 4:54 PM
Subject: Re: [s-cars] Wastegate Musings


> I don't know why the readings should be different...
> Maybe you have a wastegate frequency valve problem...
> If it is the WGFV that controls the wastegate, then a spring has no real
> affect on sustained running pressure.
> If the pressure on the wastgate piston is enough to unseat it with a stock
> spring in, then check the WG diaphragm, hose and the WGFV...
> The spring is great at affecting wastegate creep and part throttle mid 
> boost
> bleed, and this is why some of us adjust it...
> Unless I am totally off base, and I didn't think RS2 boost map allowed 
> 27-28
> PSI ???
>
> Mark S
>
> ----- Original Message ----- 
> From: "Scott Munger" <scottmunger at cox.net>
> To: "'s-car-list'" <s-car-list at audifans.com>
> Sent: Monday, May 31, 2004 6:19 PM
> Subject: [s-cars] Wastegate Musings
>
>
> > Those of you who are boosting over 23PSI with a greater than stock CFM
> > turbo, what wastegate setup are you running?
> >
> > Even with the factory spring cranked 5 full turns, my boost gauge was
> > suggesting I'm prematurely bleeding boost around 22-24PSI with the RS2
> > Turbo.  I swapped in a 1.8 BAR spring and boost comes on faster and
> doesn't
> > appear to bleed.  Readings are about 27-28 PSI.
> >
> > With a 1.8 BAR spring, the risks are that the ECU cannot control boost 
> > via
> > the WGFV below 11.6 PSI/, correct?  With a boost gauge and a driver who 
> > is
> > paying attention, this risk is tolerable.  Any other side effects?
> >
> > Thanks,
> >
> > --Scott Munger
> > '93 S4
> > '02 Jetta GLX  replaces '97 Cabriolet - Let out to pasture
> >
> >
> >
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