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I can relate there. I have an '83 930, with some tweaks.
It can run for LONG periods at sustained high speeds (above 140 mph), but what happens is that the oil temp slowly creeps upwards, and the boost pressure slowly drops.
I never had it near worrying temps, but in 20 minutes or so, I could see the temp needle creeping up and the boost wouldn't go above 0.8-0.9 Bar (mine can do 1.05) during reacceleration. For this activity of sustained high speed driving, you'd need a larger intercooler to retain full boost for any length of time.
GeorgeK
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