[s-cars] RE:Wastegate spring tightening

[Mark Strangways]

Wow, good solid advice from Pizzo...
What it this world coming too.

Mark (official outhouse taper of the 2004 //Sfest) S
----- Original Message ----- 
From: "Joe Pizzimenti" <joe.pizzimenti at gmail.com>
To: "Mihnea Cotet" <mihnea.cotet at easynet.be>
Cc: <s-car-list at audifans.com>
Sent: Friday, October 15, 2004 8:31 AM
Subject: Re: [s-cars] RE:Wastegate spring tightening


> >From the other side of the world...
>
> I've found in tooning my own car, even though the Evo has a lower
> compression ratio (8.8:1 vs. 9.3:1), on pump gas the limit seems to be
> 22psi before timing starts to get pulled back due to detonation.  Ask
> around and most other tuners will tell you the same thing.  Unless the
> timing advance is really, well, retarded, running high boost on pump
> gas is a great way to remove your cylinder head without lifting a
> wrench.
>
> Personally, I think there's more to be gained with moderate boost
> levels and good timing advance rather than the other way around.
>
> FWIW, YMMV, etc.
>
> Joe, I'm not a real tooner, but I play one on the Internet, Pizzo
>
>
>
>
> On Fri, 15 Oct 2004 14:16:31 +0200, Mihnea Cotet
> <mihnea.cotet at easynet.be> wrote:
> > Guys,
> >
> > Just a little info here: 28 psi all the way to 6k RPM and 25 psi up to
the
> > redline are both "suicidal" boost levels for an RS2 turbo.
> >
> > Apart from being bad on the turbo itself (overspinning at high RPMs),
it's
> > also totally unefficient and turns the turbo into a large heat pump.
> > Efficiency must be close to 40% at these sort of boost levels and such
high
> > RPMs. Which means that your cars will be making lots of power at
relatively
> > low RPMs (4k to 4.5k) and then the power will simply tail off, because
of
> > the increase in heat on the intake side, and also because of the
stupidly
> > high backpressure levels in the exhaust, which in turn makes the engines
> > ping a lot easier, so the ECUs will dial the timing advance back to keep
> > the engines from knocking.
> >
> > Together with my german tuner colleagues, we have a phrase to sum all
this
> > up: manchmal ist weniger mehr, or in english: sometimes less is more.
> >
> > Just a thought...
> >
> > HTH,
> >
> > Mihnea
> >
> >
> >
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> >
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