FW: [s-cars] Glowing Turbo and EM

[JShadzi at aol.com]

--
[ Picked text/plain from multipart/alternative ]
I've heard a lot of talk that if your EGT at WOT is more than 1400 or so that
something is melting, but IME that isn't the case.  On the dyno with a
confirmed AF ratio of 12.5:1 I was getting about 1650F, don't know about the
EGT, but that's a perfect AF ratio under 15psi boost.

My probe is also in the turbo inlet flange, problem is I think any raw fuel
ignited by the time it hits the collector and that can throw off readings.
Ideally I will place the probe right after the header flange for exh. port
#3, next time I have the header off.

Javad

In a message dated 9/2/2002 12:37:28 PM Pacific Daylight Time,
jeg1976 at yahoo.com writes:

>
> --- mlp <mlped at qwest.net> wrote:
> > -----Original Message-----
> > From: mlp [mailto:mlped at qwest.net]
> > Sent: Sunday, September 01, 2002 9:18 AM
> > To: Paul Friedenberg; s-car-list at audifans.com
> > Subject: RE: [s-cars] Glowing Turbo and EM
> >
> > Which brings to mind, does anyone have a line on
> > the usual EGT operating range for a turbo?
> >
> > Maximum survivable ranges?
> >
> > Temperature difference across the turbine blades?
> >
> > FWIW, a long time ago I ran an aftermarket turbo
> > charge Opal Manta.
> > Very rudimentary engine management &/or boost
> > control, i.e. in
> > reality none except an EGT gauge plumbed into the
> > exhaust about 6"
> > behind the turbo, a very small bottle of H20
> > injecting water into
> > the carburetor, and the installers instructions,
> > "When you see the
> > egt gauge get up around 1,400 F, you'd best take
> > your foot out
> > of it cause something is likely to start melting."
> >
> > I'm hearing @ a 300F drop across a turbo is, would
> > or could be
> > considered "normal" & a reasonable / desirable goal?
> > If that's the case, is one looking for @ 1,700 F as
> > reasonable
> > & acceptable for an EGT range reading in the exhaust
> > manifold, ahead of the turbine?
> >
> > Anyone have any thoughts or other information
> > sources or data
> > on acceptable EGT temperature limits or goals?
> >
> > mlp
>
> I just got back from the mountains and often saw ~1750
> at the turbo inlet when cruising up the long passes at
> ~10 psi.  I have the probe tapped into the hot side
> about 1" from the flange.  I know my fuel is good,
> timing may be a little retarded.  I'm sure I'm getting
> pretty high #s with the probe right there, one of
> these days I'll put it in a single runner and compare.
>