FW: [s-cars] Glowing Turbo and EM

[Jim Green]

--- 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.

=====
Jim Green
'89 90tq 034EFI, Haltech IG5
http://www.geocities.com/jeg1976/car_home.html

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