Unless you place a 'load' on these engines, you can't accurately determine how much turbo boost you're getting.

Run the boost gauge into the cabin, go find a long hill and hammer down at 45-50 mph. Boost should max at .9 BAR (13.05 PSI) somewhere between 2200 rpm and 2800 rpm. Simply revving the engine in the driveway doesn't put near enough fuel into the engine to make any real boost.

If you're getting more boost than .9 BAR, the overboost valve should close at 1.1 BAR, killing pressure to the ALDA and limiting fuel enrichment.

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Never a dull moment at Berry Hill Farm.