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Old 06-02-2017, 07:27 AM
v8volvo v8volvo is offline
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Join Date: Jun 2009
Location: Montana, USA
Vehicle: '86 745, '83 764
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Suddenly started doing this or been this way since it was first put together?

Sounds like an air inlet restriction issue. The smoke and high EGT suggests there should be more than enough drive pressure to spin the turbo but loss of boost with RPM says something isn't able to move enough air to keep up.

Where are you measuring boost PSI, after the intercooler or before it? If you are measuring it after the intercooler, have you checked pressure drop across the cooler?

What kind of air filter are you running? Checked vacuum on the turbo inlet?
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86 745 D24T/ZF 345k lifted 2.5"
83 764 D24T/M46 155k
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