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My '87 comes on boost about the same time yours does, but it pulls hard all the way up to redline. Then I'll shift it. I really don't feel the boost falling off. When I shift from 2nd to 3rd I'm still in the boost range. My car is completely stock.
Just a guess here, but maybe you have a faulty wastegate or BOV bleeding off the pressure. Basically what I'm saying is that your car is probably making boost, but it's not getting to the engine.
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Bill
997.2
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