Glowing Turbos too hot..... cracked toyota turbo

[Stpndsmnn at aol.com]

I have always read that the optimum place for an EGT probe is about 4 inches
from the exhaust port on the leanest cylinder.  For all the MC guys out there
that should be # 5...  Of course with the stock Audi EM that optimum distance
can be hard to achieve.  I have also read that placing the probe near the
flange can lead to false high readings because of heat absorption and back
pressure in the turbo etc...

For people running stock valves you never want to be over 1650 for any length
of time because that will melt stuff.   Yes, even the amazing sodium cooled
valves I've seen those melt just like regular valves.  1450 is a pretty
optimum temp for highway cruising of course those temps are dependant on
proper placement of the EGT probe.

The rule of thumb for probes placed after the turbo is that you never want to
see much more than 1350 for any extended length of time....

I just finished welding a turbine housing for a friends toyota truck (22R
turbo engine) He got his turbo to the glow point (extended 1650 to 1700
temps) and ended up with a large crack between the turbine and the internal
WG flapper.  The crack was bad enough that he was losing about 5 psi of boost
and exhaust was leaking through the turbine housing...

Dont get them too hot.....
Matt Kramer
83 cgtt