1000 C pre-turbo is not abnormally high for any turbo engine at 17 psi boost, I actually would have expected higher (there are diesels making more than that).
(The continuous temperature increase is probably from several factors, heating of the rotor/housing surface, increased turbine back pressure, and less time to burn the fuel in the chamber at higher revs.)
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1986 GXL ('87 4-port NA - Haltech E8, LS2 Coils. Defined Autoworks Headers, Dual 2.5" Exhaust (Dual Superflow, dBX mufflers)
1991 Coupe (KYB AGX Shocks, Eibach lowering springs, RB exhaust, Stock and Automatic)
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