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Just read the DSM forum with great information. I think I might found answers to my own questions. I will post here for future reference for zilvians.
Since DSM people have similar engine (4 cyl. alum block w/ t25/t28), I assume their gauge readings would be relatively effective on sr20. Their average egt readings are 800 deg C (1472 deg F) on 75mph hwy cruising and 900 deg C (1652 deg F) under 11~14psi boost.
Base on their conclusions, 1600 deg F is the highest safe side you should go, beyond that would be asking internal stress or melting. These egt readings are measured from probe mounted on manifold. For probe mounted after turbo should add 100~150 to be approx correct.
Reasons cause egt to change: (thanks dsm forums)
"Retarded timing will raise EGTs. So in effect, running lean still raises EGTs, but not for the right reasons. Also, running excessively rich will raise EGTs due to fuel still burning as it leaves the motor and passes the sensor. Retarded timing raises EGTs the same way. AFR will affect EGT, but to a small degree. The large swings people report are all from ignition timing changes."
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